Merge pull request #57415 from stealthybox/feature/kubeadm_594-etcd_tls

Automatic merge from submit-queue (batch tested with PRs 59159, 60318, 60079, 59371, 57415). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Feature/kubeadm 594 etcd TLS on init/upgrade

**What this PR does / why we need it**:
On `kubeadm init`/`kubeadm upgrade`, this PR generates certificates for securing local etcd:
- etcd serving cert
- etcd peer cert
- apiserver etcd client cert

Flags and hostMounts are added to the etcd and apiserver static-pods to load these certs.
For connections to etcd, `https` is now used in favor of `http` and tests have been added/updated.

Etcd only listens on localhost, so the serving cert SAN defaults to `DNS:localhost,IP:127.0.0.1`.
The etcd peer cert has SANs for `<hostname>,<api-advertise-address>`, but is unused.

New kubeadm config options, `Etcd.ServerCertSANs` and `Etcd.PeerCertSANs`, are used for user additions to the default certificate SANs for the etcd server and peer certs.

This feature continues to utilize the existence of `MasterConfiguration.Etcd.Endpoints` as a feature gate for external-etcd.
If the user passes flags to configure `Etcd.{CAFile,CertFile,KeyFile}` but they omit `Endpoints`, these flags will be unused, and a warning is printed.

New phase commands:
```
kubeadm alpha phase certs etcd-server
kubeadm alpha phase certs etcd-peer
kubeadm alpha phase certs apiserver-etcd-client 
```

**Which issue(s) this PR fixes**
Fixes https://github.com/kubernetes/kubeadm/issues/594

**Special notes for your reviewer**:

#### on the master
these should fail:
```bash
curl localhost:2379/v2/keys  # no output
curl --cacert /etc/kubernetes/pki/ca.crt https://localhost:2379/v2/keys  # handshake error
```
these should succeed:
```
cd /etc/kubernetes/pki
curl --cacert ca.crt --cert apiserver-etcd-client.crt --key apiserver-etcd-client.key https://localhost:2379/v2/keys
```

**Release note**:
```release-note
On cluster provision or upgrade, kubeadm now generates certs and secures all connections to the etcd static-pod with mTLS.
```

cmd/kubeadm/app/apis/kubeadm/fuzzer/fuzzer.go

@@ -43,6 +43,8 @@ func Funcs(codecs runtimeserializer.CodecFactory) []interface{} {
 			obj.AuthorizationModes = []string{"foo"}
 			obj.CertificatesDir = "foo"
 			obj.APIServerCertSANs = []string{"foo"}
+			obj.Etcd.ServerCertSANs = []string{"foo"}
+			obj.Etcd.PeerCertSANs = []string{"foo"}
 			obj.Token = "foo"
 			obj.CRISocket = "foo"
 			obj.Etcd.Image = "foo"

cmd/kubeadm/app/apis/kubeadm/types.go

@@ -178,6 +178,12 @@ type Etcd struct {
 	Image string
 	// SelfHosted holds configuration for self-hosting etcd.
 	SelfHosted *SelfHostedEtcd
+	// ServerCertSANs sets extra Subject Alternative Names for the etcd server
+	// signing cert. This is currently used for the etcd static-pod.
+	ServerCertSANs []string
+	// PeerCertSANs sets extra Subject Alternative Names for the etcd peer
+	// signing cert. This is currently used for the etcd static-pod.
+	PeerCertSANs []string
 }
 
 // SelfHostedEtcd describes options required to configure self-hosted etcd.

cmd/kubeadm/app/apis/kubeadm/v1alpha1/types.go

@@ -170,6 +170,10 @@ type Etcd struct {
 	Image string `json:"image"`
 	// SelfHosted holds configuration for self-hosting etcd.
 	SelfHosted *SelfHostedEtcd `json:"selfHosted,omitempty"`
+	// ServerCertSANs sets extra Subject Alternative Names for the etcd server signing cert.
+	ServerCertSANs []string `json:"serverCertSANs,omitempty"`
+	// PeerCertSANs sets extra Subject Alternative Names for the etcd peer signing cert.
+	PeerCertSANs []string `json:"peerCertSANs,omitempty"`
 }
 
 // SelfHostedEtcd describes options required to configure self-hosted etcd.

cmd/kubeadm/app/apis/kubeadm/v1alpha1/zz_generated.conversion.go

@@ -122,6 +122,8 @@ func autoConvert_v1alpha1_Etcd_To_kubeadm_Etcd(in *Etcd, out *kubeadm.Etcd, s co
 	out.ExtraArgs = *(*map[string]string)(unsafe.Pointer(&in.ExtraArgs))
 	out.Image = in.Image
 	out.SelfHosted = (*kubeadm.SelfHostedEtcd)(unsafe.Pointer(in.SelfHosted))
+	out.ServerCertSANs = *(*[]string)(unsafe.Pointer(&in.ServerCertSANs))
+	out.PeerCertSANs = *(*[]string)(unsafe.Pointer(&in.PeerCertSANs))
 	return nil
 }
 
@@ -139,6 +141,8 @@ func autoConvert_kubeadm_Etcd_To_v1alpha1_Etcd(in *kubeadm.Etcd, out *Etcd, s co
 	out.ExtraArgs = *(*map[string]string)(unsafe.Pointer(&in.ExtraArgs))
 	out.Image = in.Image
 	out.SelfHosted = (*SelfHostedEtcd)(unsafe.Pointer(in.SelfHosted))
+	out.ServerCertSANs = *(*[]string)(unsafe.Pointer(&in.ServerCertSANs))
+	out.PeerCertSANs = *(*[]string)(unsafe.Pointer(&in.PeerCertSANs))
 	return nil
 }
 

cmd/kubeadm/app/apis/kubeadm/v1alpha1/zz_generated.deepcopy.go

@@ -92,6 +92,16 @@ func (in *Etcd) DeepCopyInto(out *Etcd) {
 			**out = **in
 		}
 	}
+	if in.ServerCertSANs != nil {
+		in, out := &in.ServerCertSANs, &out.ServerCertSANs
+		*out = make([]string, len(*in))
+		copy(*out, *in)
+	}
+	if in.PeerCertSANs != nil {
+		in, out := &in.PeerCertSANs, &out.PeerCertSANs
+		*out = make([]string, len(*in))
+		copy(*out, *in)
+	}
 	return
 }
 

cmd/kubeadm/app/apis/kubeadm/validation/validation.go

@@ -72,7 +72,9 @@ func ValidateMasterConfiguration(c *kubeadm.MasterConfiguration) field.ErrorList
 	allErrs = append(allErrs, ValidateCloudProvider(c.CloudProvider, field.NewPath("cloudprovider"))...)
 	allErrs = append(allErrs, ValidateAuthorizationModes(c.AuthorizationModes, field.NewPath("authorization-modes"))...)
 	allErrs = append(allErrs, ValidateNetworking(&c.Networking, field.NewPath("networking"))...)
-	allErrs = append(allErrs, ValidateAPIServerCertSANs(c.APIServerCertSANs, field.NewPath("cert-altnames"))...)
+	allErrs = append(allErrs, ValidateCertSANs(c.APIServerCertSANs, field.NewPath("api-server-cert-altnames"))...)
+	allErrs = append(allErrs, ValidateCertSANs(c.Etcd.ServerCertSANs, field.NewPath("etcd-server-cert-altnames"))...)
+	allErrs = append(allErrs, ValidateCertSANs(c.Etcd.PeerCertSANs, field.NewPath("etcd-peer-cert-altnames"))...)
 	allErrs = append(allErrs, ValidateAbsolutePath(c.CertificatesDir, field.NewPath("certificates-dir"))...)
 	allErrs = append(allErrs, ValidateNodeName(c.NodeName, field.NewPath("node-name"))...)
 	allErrs = append(allErrs, ValidateToken(c.Token, field.NewPath("token"))...)
@@ -228,8 +230,8 @@ func ValidateToken(t string, fldPath *field.Path) field.ErrorList {
 	return allErrs
 }
 
-// ValidateAPIServerCertSANs validates alternative names
+// ValidateCertSANs validates alternative names
-func ValidateAPIServerCertSANs(altnames []string, fldPath *field.Path) field.ErrorList {
+func ValidateCertSANs(altnames []string, fldPath *field.Path) field.ErrorList {
 	allErrs := field.ErrorList{}
 	for _, altname := range altnames {
 		if len(validation.IsDNS1123Subdomain(altname)) != 0 && net.ParseIP(altname) == nil {

cmd/kubeadm/app/apis/kubeadm/validation/validation_test.go

@@ -134,7 +134,7 @@ func TestValidateCloudProvider(t *testing.T) {
 	}
 }
 
-func TestValidateAPIServerCertSANs(t *testing.T) {
+func TestValidateCertSANs(t *testing.T) {
 	var tests = []struct {
 		sans     []string
 		expected bool
@@ -148,10 +148,10 @@ func TestValidateAPIServerCertSANs(t *testing.T) {
 		{[]string{"my-hostname2", "my.other.subdomain", "2001:db8::10"}, true}, // supported
 	}
 	for _, rt := range tests {
-		actual := ValidateAPIServerCertSANs(rt.sans, nil)
+		actual := ValidateCertSANs(rt.sans, nil)
 		if (len(actual) == 0) != rt.expected {
 			t.Errorf(
-				"failed ValidateAPIServerCertSANs:\n\texpected: %t\n\t  actual: %t",
+				"failed ValidateCertSANs:\n\texpected: %t\n\t  actual: %t",
 				rt.expected,
 				(len(actual) == 0),
 			)

cmd/kubeadm/app/apis/kubeadm/zz_generated.deepcopy.go

@@ -92,6 +92,16 @@ func (in *Etcd) DeepCopyInto(out *Etcd) {
 			**out = **in
 		}
 	}
+	if in.ServerCertSANs != nil {
+		in, out := &in.ServerCertSANs, &out.ServerCertSANs
+		*out = make([]string, len(*in))
+		copy(*out, *in)
+	}
+	if in.PeerCertSANs != nil {
+		in, out := &in.PeerCertSANs, &out.PeerCertSANs
+		*out = make([]string, len(*in))
+		copy(*out, *in)
+	}
 	return
 }
 

cmd/kubeadm/app/cmd/phases/certs.go

@@ -60,8 +60,8 @@ var (
 	apiServerCertLongDesc = fmt.Sprintf(normalizer.LongDesc(`
 		Generates the API server serving certificate and key and saves them into %s and %s files.
 		
-		The certificate includes default subject alternative names and additional sans eventually provided by the user;
+		The certificate includes default subject alternative names and additional SANs provided by the user;
-		default sans are: <node-name>, <apiserver-advertise-address>, kubernetes, kubernetes.default, kubernetes.default.svc, 
+		default SANs are: <node-name>, <apiserver-advertise-address>, kubernetes, kubernetes.default, kubernetes.default.svc,
 		kubernetes.default.svc.<service-dns-domain>, <internalAPIServerVirtualIP> (that is the .10 address in <service-cidr> address space).
 
 		If both files already exist, kubeadm skips the generation step and existing files will be used.
@@ -74,6 +74,31 @@ var (
 		If both files already exist, kubeadm skips the generation step and existing files will be used.
 		`+cmdutil.AlphaDisclaimer), kubeadmconstants.APIServerKubeletClientCertName, kubeadmconstants.APIServerKubeletClientKeyName)
 
+	etcdServerCertLongDesc = fmt.Sprintf(normalizer.LongDesc(`
+		Generates the etcd serving certificate and key and saves them into %s and %s files.
+		
+		The certificate includes default subject alternative names and additional SANs provided by the user;
+		default SANs are: localhost, 127.0.0.1.
+
+		If both files already exist, kubeadm skips the generation step and existing files will be used.
+		`+cmdutil.AlphaDisclaimer), kubeadmconstants.EtcdServerCertName, kubeadmconstants.EtcdServerKeyName)
+
+	etcdPeerCertLongDesc = fmt.Sprintf(normalizer.LongDesc(`
+		Generates the etcd peer certificate and key and saves them into %s and %s files.
+		
+		The certificate includes default subject alternative names and additional SANs provided by the user;
+		default SANs are: <node-name>, <apiserver-advertise-address>.
+
+		If both files already exist, kubeadm skips the generation step and existing files will be used.
+		`+cmdutil.AlphaDisclaimer), kubeadmconstants.EtcdPeerCertName, kubeadmconstants.EtcdPeerKeyName)
+
+	apiServerEtcdServerCertLongDesc = fmt.Sprintf(normalizer.LongDesc(`
+		Generates the client certificate for the API server to connect to etcd securely and the respective key,
+		and saves them into %s and %s files.
+
+		If both files already exist, kubeadm skips the generation step and existing files will be used.
+		`+cmdutil.AlphaDisclaimer), kubeadmconstants.APIServerEtcdClientCertName, kubeadmconstants.APIServerEtcdClientKeyName)
+
 	saKeyLongDesc = fmt.Sprintf(normalizer.LongDesc(`
 		Generates the private key for signing service account tokens along with its public key, and saves them into
 		%s and %s files.
@@ -157,6 +182,24 @@ func getCertsSubCommands(defaultKubernetesVersion string) []*cobra.Command {
 			long:    apiServerKubeletCertLongDesc,
 			cmdFunc: certsphase.CreateAPIServerKubeletClientCertAndKeyFiles,
 		},
+		{
+			use:     "etcd-server",
+			short:   "Generates etcd serving certificate and key",
+			long:    etcdServerCertLongDesc,
+			cmdFunc: certsphase.CreateEtcdServerCertAndKeyFiles,
+		},
+		{
+			use:     "etcd-peer",
+			short:   "Generates etcd peer certificate and key",
+			long:    etcdPeerCertLongDesc,
+			cmdFunc: certsphase.CreateEtcdPeerCertAndKeyFiles,
+		},
+		{
+			use:     "apiserver-etcd-client",
+			short:   "Generates client certificate for the API server to connect to etcd securely",
+			long:    apiServerEtcdServerCertLongDesc,
+			cmdFunc: certsphase.CreateAPIServerEtcdClientCertAndKeyFiles,
+		},
 		{
 			use:     "sa",
 			short:   "Generates a private key for signing service account tokens along with its public key",

cmd/kubeadm/app/constants/constants.go

@@ -65,6 +65,33 @@ const (
 	// APIServerKubeletClientCertCommonName defines kubelet client certificate common name (CN)
 	APIServerKubeletClientCertCommonName = "kube-apiserver-kubelet-client"
 
+	// EtcdServerCertAndKeyBaseName defines etcd's server certificate and key base name
+	EtcdServerCertAndKeyBaseName = "etcd/server"
+	// EtcdServerCertName defines etcd's server certificate name
+	EtcdServerCertName = "etcd/server.crt"
+	// EtcdServerKeyName defines etcd's server key name
+	EtcdServerKeyName = "etcd/server.key"
+	// EtcdServerCertCommonName defines etcd's server certificate common name (CN)
+	EtcdServerCertCommonName = "kube-etcd"
+
+	// EtcdPeerCertAndKeyBaseName defines etcd's peer certificate and key base name
+	EtcdPeerCertAndKeyBaseName = "etcd/peer"
+	// EtcdPeerCertName defines etcd's peer certificate name
+	EtcdPeerCertName = "etcd/peer.crt"
+	// EtcdPeerKeyName defines etcd's peer key name
+	EtcdPeerKeyName = "etcd/peer.key"
+	// EtcdPeerCertCommonName defines etcd's peer certificate common name (CN)
+	EtcdPeerCertCommonName = "kube-etcd-peer"
+
+	// APIServerEtcdClientCertAndKeyBaseName defines etcd client certificate and key base name
+	APIServerEtcdClientCertAndKeyBaseName = "apiserver-etcd-client"
+	// APIServerEtcdClientCertName defines etcd client certificate name
+	APIServerEtcdClientCertName = "apiserver-etcd-client.crt"
+	// APIServerEtcdClientKeyName defines etcd client key name
+	APIServerEtcdClientKeyName = "apiserver-etcd-client.key"
+	// APIServerEtcdClientCertCommonName defines etcd client certificate common name (CN)
+	APIServerEtcdClientCertCommonName = "kube-apiserver-etcd-client"
+
 	// ServiceAccountKeyBaseName defines SA key base name
 	ServiceAccountKeyBaseName = "sa"
 	// ServiceAccountPublicKeyName defines SA public key base name

cmd/kubeadm/app/phases/certs/BUILD

@@ -30,8 +30,6 @@ go_library(
         "//cmd/kubeadm/app/apis/kubeadm:go_default_library",
         "//cmd/kubeadm/app/constants:go_default_library",
         "//cmd/kubeadm/app/phases/certs/pkiutil:go_default_library",
-        "//pkg/registry/core/service/ipallocator:go_default_library",
-        "//vendor/k8s.io/apimachinery/pkg/util/validation:go_default_library",
         "//vendor/k8s.io/client-go/util/cert:go_default_library",
     ],
 )

cmd/kubeadm/app/phases/certs/certs.go

@@ -20,16 +20,13 @@ import (
 	"crypto/rsa"
 	"crypto/x509"
 	"fmt"
-	"net"
 	"os"
 	"path/filepath"
 
-	"k8s.io/apimachinery/pkg/util/validation"
 	certutil "k8s.io/client-go/util/cert"
 	kubeadmapi "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm"
 	kubeadmconstants "k8s.io/kubernetes/cmd/kubeadm/app/constants"
 	"k8s.io/kubernetes/cmd/kubeadm/app/phases/certs/pkiutil"
-	"k8s.io/kubernetes/pkg/registry/core/service/ipallocator"
 )
 
 // CreatePKIAssets will create and write to disk all PKI assets necessary to establish the control plane.
@@ -40,6 +37,9 @@ func CreatePKIAssets(cfg *kubeadmapi.MasterConfiguration) error {
 		CreateCACertAndKeyfiles,
 		CreateAPIServerCertAndKeyFiles,
 		CreateAPIServerKubeletClientCertAndKeyFiles,
+		CreateEtcdServerCertAndKeyFiles,
+		CreateEtcdPeerCertAndKeyFiles,
+		CreateAPIServerEtcdClientCertAndKeyFiles,
 		CreateServiceAccountKeyAndPublicKeyFiles,
 		CreateFrontProxyCACertAndKeyFiles,
 		CreateFrontProxyClientCertAndKeyFiles,
@@ -79,7 +79,7 @@ func CreateCACertAndKeyfiles(cfg *kubeadmapi.MasterConfiguration) error {
 // It assumes the cluster CA certificate and key files should exists into the CertificatesDir
 func CreateAPIServerCertAndKeyFiles(cfg *kubeadmapi.MasterConfiguration) error {
 
-	caCert, caKey, err := loadCertificateAuthorithy(cfg.CertificatesDir, kubeadmconstants.CACertAndKeyBaseName)
+	caCert, caKey, err := loadCertificateAuthority(cfg.CertificatesDir, kubeadmconstants.CACertAndKeyBaseName)
 	if err != nil {
 		return err
 	}
@@ -103,12 +103,12 @@ func CreateAPIServerCertAndKeyFiles(cfg *kubeadmapi.MasterConfiguration) error {
 // It assumes the cluster CA certificate and key files should exists into the CertificatesDir
 func CreateAPIServerKubeletClientCertAndKeyFiles(cfg *kubeadmapi.MasterConfiguration) error {
 
-	caCert, caKey, err := loadCertificateAuthorithy(cfg.CertificatesDir, kubeadmconstants.CACertAndKeyBaseName)
+	caCert, caKey, err := loadCertificateAuthority(cfg.CertificatesDir, kubeadmconstants.CACertAndKeyBaseName)
 	if err != nil {
 		return err
 	}
 
-	apiClientCert, apiClientKey, err := NewAPIServerKubeletClientCertAndKey(caCert, caKey)
+	apiKubeletClientCert, apiKubeletClientKey, err := NewAPIServerKubeletClientCertAndKey(caCert, caKey)
 	if err != nil {
 		return err
 	}
@@ -117,8 +117,80 @@ func CreateAPIServerKubeletClientCertAndKeyFiles(cfg *kubeadmapi.MasterConfigura
 		cfg.CertificatesDir,
 		kubeadmconstants.APIServerKubeletClientCertAndKeyBaseName,
 		caCert,
-		apiClientCert,
+		apiKubeletClientCert,
-		apiClientKey,
+		apiKubeletClientKey,
+	)
+}
+
+// CreateEtcdServerCertAndKeyFiles create a new certificate and key file for etcd.
+// If the etcd serving certificate and key file already exist in the target folder, they are used only if evaluated equal; otherwise an error is returned.
+// It assumes the cluster CA certificate and key file exist in the CertificatesDir
+func CreateEtcdServerCertAndKeyFiles(cfg *kubeadmapi.MasterConfiguration) error {
+
+	caCert, caKey, err := loadCertificateAuthority(cfg.CertificatesDir, kubeadmconstants.CACertAndKeyBaseName)
+	if err != nil {
+		return err
+	}
+
+	etcdServerCert, etcdServerKey, err := NewEtcdServerCertAndKey(cfg, caCert, caKey)
+	if err != nil {
+		return err
+	}
+
+	return writeCertificateFilesIfNotExist(
+		cfg.CertificatesDir,
+		kubeadmconstants.EtcdServerCertAndKeyBaseName,
+		caCert,
+		etcdServerCert,
+		etcdServerKey,
+	)
+}
+
+// CreateEtcdPeerCertAndKeyFiles create a new certificate and key file for etcd peering.
+// If the etcd peer certificate and key file already exist in the target folder, they are used only if evaluated equal; otherwise an error is returned.
+// It assumes the cluster CA certificate and key file exist in the CertificatesDir
+func CreateEtcdPeerCertAndKeyFiles(cfg *kubeadmapi.MasterConfiguration) error {
+
+	caCert, caKey, err := loadCertificateAuthority(cfg.CertificatesDir, kubeadmconstants.CACertAndKeyBaseName)
+	if err != nil {
+		return err
+	}
+
+	etcdPeerCert, etcdPeerKey, err := NewEtcdPeerCertAndKey(cfg, caCert, caKey)
+	if err != nil {
+		return err
+	}
+
+	return writeCertificateFilesIfNotExist(
+		cfg.CertificatesDir,
+		kubeadmconstants.EtcdPeerCertAndKeyBaseName,
+		caCert,
+		etcdPeerCert,
+		etcdPeerKey,
+	)
+}
+
+// CreateAPIServerEtcdClientCertAndKeyFiles create a new client certificate for the apiserver calling etcd
+// If the apiserver-etcd-client certificate and key file already exist in the target folder, they are used only if evaluated equal; otherwise an error is returned.
+// It assumes the cluster CA certificate and key file exist in the CertificatesDir
+func CreateAPIServerEtcdClientCertAndKeyFiles(cfg *kubeadmapi.MasterConfiguration) error {
+
+	caCert, caKey, err := loadCertificateAuthority(cfg.CertificatesDir, kubeadmconstants.CACertAndKeyBaseName)
+	if err != nil {
+		return err
+	}
+
+	apiEtcdClientCert, apiEtcdClientKey, err := NewAPIServerEtcdClientCertAndKey(caCert, caKey)
+	if err != nil {
+		return err
+	}
+
+	return writeCertificateFilesIfNotExist(
+		cfg.CertificatesDir,
+		kubeadmconstants.APIServerEtcdClientCertAndKeyBaseName,
+		caCert,
+		apiEtcdClientCert,
+		apiEtcdClientKey,
 	)
 }
 
@@ -163,7 +235,7 @@ func CreateFrontProxyCACertAndKeyFiles(cfg *kubeadmapi.MasterConfiguration) erro
 // It assumes the front proxy CAA certificate and key files should exists into the CertificatesDir
 func CreateFrontProxyClientCertAndKeyFiles(cfg *kubeadmapi.MasterConfiguration) error {
 
-	frontProxyCACert, frontProxyCAKey, err := loadCertificateAuthorithy(cfg.CertificatesDir, kubeadmconstants.FrontProxyCACertAndKeyBaseName)
+	frontProxyCACert, frontProxyCAKey, err := loadCertificateAuthority(cfg.CertificatesDir, kubeadmconstants.FrontProxyCACertAndKeyBaseName)
 	if err != nil {
 		return err
 	}
@@ -196,7 +268,7 @@ func NewCACertAndKey() (*x509.Certificate, *rsa.PrivateKey, error) {
 // NewAPIServerCertAndKey generate CA certificate for apiserver, signed by the given CA.
 func NewAPIServerCertAndKey(cfg *kubeadmapi.MasterConfiguration, caCert *x509.Certificate, caKey *rsa.PrivateKey) (*x509.Certificate, *rsa.PrivateKey, error) {
 
-	altNames, err := getAltNames(cfg)
+	altNames, err := pkiutil.GetAPIServerAltNames(cfg)
 	if err != nil {
 		return nil, nil, fmt.Errorf("failure while composing altnames for API server: %v", err)
 	}
@@ -230,6 +302,64 @@ func NewAPIServerKubeletClientCertAndKey(caCert *x509.Certificate, caKey *rsa.Pr
 	return apiClientCert, apiClientKey, nil
 }
 
+// NewEtcdServerCertAndKey generate CA certificate for etcd, signed by the given CA.
+func NewEtcdServerCertAndKey(cfg *kubeadmapi.MasterConfiguration, caCert *x509.Certificate, caKey *rsa.PrivateKey) (*x509.Certificate, *rsa.PrivateKey, error) {
+
+	altNames, err := pkiutil.GetEtcdAltNames(cfg)
+	if err != nil {
+		return nil, nil, fmt.Errorf("failure while composing altnames for etcd: %v", err)
+	}
+
+	config := certutil.Config{
+		CommonName: kubeadmconstants.EtcdServerCertCommonName,
+		AltNames:   *altNames,
+		Usages:     []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
+	}
+	etcdServerCert, etcdServerKey, err := pkiutil.NewCertAndKey(caCert, caKey, config)
+	if err != nil {
+		return nil, nil, fmt.Errorf("failure while creating etcd key and certificate: %v", err)
+	}
+
+	return etcdServerCert, etcdServerKey, nil
+}
+
+// NewEtcdPeerCertAndKey generate CA certificate for etcd peering, signed by the given CA.
+func NewEtcdPeerCertAndKey(cfg *kubeadmapi.MasterConfiguration, caCert *x509.Certificate, caKey *rsa.PrivateKey) (*x509.Certificate, *rsa.PrivateKey, error) {
+
+	altNames, err := pkiutil.GetEtcdPeerAltNames(cfg)
+	if err != nil {
+		return nil, nil, fmt.Errorf("failure while composing altnames for etcd peering: %v", err)
+	}
+
+	config := certutil.Config{
+		CommonName: kubeadmconstants.EtcdPeerCertCommonName,
+		AltNames:   *altNames,
+		Usages:     []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth},
+	}
+	etcdPeerCert, etcdPeerKey, err := pkiutil.NewCertAndKey(caCert, caKey, config)
+	if err != nil {
+		return nil, nil, fmt.Errorf("failure while creating etcd peer key and certificate: %v", err)
+	}
+
+	return etcdPeerCert, etcdPeerKey, nil
+}
+
+// NewAPIServerEtcdClientCertAndKey generate CA certificate for the apiservers to connect to etcd securely, signed by the given CA.
+func NewAPIServerEtcdClientCertAndKey(caCert *x509.Certificate, caKey *rsa.PrivateKey) (*x509.Certificate, *rsa.PrivateKey, error) {
+
+	config := certutil.Config{
+		CommonName:   kubeadmconstants.APIServerEtcdClientCertCommonName,
+		Organization: []string{kubeadmconstants.MastersGroup},
+		Usages:       []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth},
+	}
+	apiClientCert, apiClientKey, err := pkiutil.NewCertAndKey(caCert, caKey, config)
+	if err != nil {
+		return nil, nil, fmt.Errorf("failure while creating API server etcd client key and certificate: %v", err)
+	}
+
+	return apiClientCert, apiClientKey, nil
+}
+
 // NewServiceAccountSigningKey generate public/private key pairs for signing service account tokens.
 func NewServiceAccountSigningKey() (*rsa.PrivateKey, error) {
 
@@ -268,8 +398,8 @@ func NewFrontProxyClientCertAndKey(frontProxyCACert *x509.Certificate, frontProx
 	return frontProxyClientCert, frontProxyClientKey, nil
 }
 
-// loadCertificateAuthorithy loads certificate authority
+// loadCertificateAuthority loads certificate authority
-func loadCertificateAuthorithy(pkiDir string, baseName string) (*x509.Certificate, *rsa.PrivateKey, error) {
+func loadCertificateAuthority(pkiDir string, baseName string) (*x509.Certificate, *rsa.PrivateKey, error) {
 	// Checks if certificate authority exists in the PKI directory
 	if !pkiutil.CertOrKeyExist(pkiDir, baseName) {
 		return nil, nil, fmt.Errorf("couldn't load %s certificate authority from %s", baseName, pkiDir)
@@ -503,55 +633,3 @@ func validatePrivatePublicKey(l certKeyLocation) error {
 	}
 	return nil
 }
-
-// getAltNames builds an AltNames object for to be used when generating apiserver certificate
-func getAltNames(cfg *kubeadmapi.MasterConfiguration) (*certutil.AltNames, error) {
-
-	// advertise address
-	advertiseAddress := net.ParseIP(cfg.API.AdvertiseAddress)
-	if advertiseAddress == nil {
-		return nil, fmt.Errorf("error parsing API AdvertiseAddress %v: is not a valid textual representation of an IP address", cfg.API.AdvertiseAddress)
-	}
-
-	// internal IP address for the API server
-	_, svcSubnet, err := net.ParseCIDR(cfg.Networking.ServiceSubnet)
-	if err != nil {
-		return nil, fmt.Errorf("error parsing CIDR %q: %v", cfg.Networking.ServiceSubnet, err)
-	}
-
-	internalAPIServerVirtualIP, err := ipallocator.GetIndexedIP(svcSubnet, 1)
-	if err != nil {
-		return nil, fmt.Errorf("unable to get first IP address from the given CIDR (%s): %v", svcSubnet.String(), err)
-	}
-
-	// create AltNames with defaults DNSNames/IPs
-	altNames := &certutil.AltNames{
-		DNSNames: []string{
-			cfg.NodeName,
-			"kubernetes",
-			"kubernetes.default",
-			"kubernetes.default.svc",
-			fmt.Sprintf("kubernetes.default.svc.%s", cfg.Networking.DNSDomain),
-		},
-		IPs: []net.IP{
-			internalAPIServerVirtualIP,
-			advertiseAddress,
-		},
-	}
-
-	// adds additional SAN
-	for _, altname := range cfg.APIServerCertSANs {
-		if ip := net.ParseIP(altname); ip != nil {
-			altNames.IPs = append(altNames.IPs, ip)
-		} else if len(validation.IsDNS1123Subdomain(altname)) == 0 {
-			altNames.DNSNames = append(altNames.DNSNames, altname)
-		}
-	}
-
-	// add api server dns advertise address
-	if len(cfg.API.ControlPlaneEndpoint) > 0 {
-		altNames.DNSNames = append(altNames.DNSNames, cfg.API.ControlPlaneEndpoint)
-	}
-
-	return altNames, nil
-}

cmd/kubeadm/app/phases/certs/certs_test.go

@@ -258,53 +258,6 @@ func TestWriteKeyFilesIfNotExist(t *testing.T) {
 	}
 }
 
-func TestGetAltNames(t *testing.T) {
-	hostname := "valid-hostname"
-	advertiseIP := "1.2.3.4"
-	controlPlaneEndpoint := "api.k8s.io"
-	cfg := &kubeadmapi.MasterConfiguration{
-		API:               kubeadmapi.API{AdvertiseAddress: advertiseIP, ControlPlaneEndpoint: controlPlaneEndpoint},
-		Networking:        kubeadmapi.Networking{ServiceSubnet: "10.96.0.0/12", DNSDomain: "cluster.local"},
-		NodeName:          hostname,
-		APIServerCertSANs: []string{"10.1.245.94", "10.1.245.95"},
-	}
-
-	altNames, err := getAltNames(cfg)
-	if err != nil {
-		t.Fatalf("failed calling getAltNames: %v", err)
-	}
-
-	expectedDNSNames := []string{hostname, "kubernetes", "kubernetes.default", "kubernetes.default.svc", "kubernetes.default.svc.cluster.local", controlPlaneEndpoint}
-	for _, DNSName := range expectedDNSNames {
-		found := false
-		for _, val := range altNames.DNSNames {
-			if val == DNSName {
-				found = true
-				break
-			}
-		}
-
-		if !found {
-			t.Errorf("altNames does not contain DNSName %s", DNSName)
-		}
-	}
-
-	expectedIPAddresses := []string{"10.96.0.1", advertiseIP, "10.1.245.94", "10.1.245.95"}
-	for _, IPAddress := range expectedIPAddresses {
-		found := false
-		for _, val := range altNames.IPs {
-			if val.Equal(net.ParseIP(IPAddress)) {
-				found = true
-				break
-			}
-		}
-
-		if !found {
-			t.Errorf("altNames does not contain IPAddress %s", IPAddress)
-		}
-	}
-}
-
 func TestNewCACertAndKey(t *testing.T) {
 	caCert, _, err := NewCACertAndKey()
 	if err != nil {
@@ -322,7 +275,7 @@ func TestNewAPIServerCertAndKey(t *testing.T) {
 		cfg := &kubeadmapi.MasterConfiguration{
 			API:        kubeadmapi.API{AdvertiseAddress: addr},
 			Networking: kubeadmapi.Networking{ServiceSubnet: "10.96.0.0/12", DNSDomain: "cluster.local"},
-			NodeName:   "valid-hostname",
+			NodeName:   hostname,
 		}
 		caCert, caKey, err := NewCACertAndKey()
 		if err != nil {
@@ -347,14 +300,93 @@ func TestNewAPIServerKubeletClientCertAndKey(t *testing.T) {
 		t.Fatalf("failed creation of ca cert and key: %v", err)
 	}
 
-	apiClientCert, _, err := NewAPIServerKubeletClientCertAndKey(caCert, caKey)
+	apiKubeletClientCert, _, err := NewAPIServerKubeletClientCertAndKey(caCert, caKey)
 	if err != nil {
 		t.Fatalf("failed creation of cert and key: %v", err)
 	}
 
-	certstestutil.AssertCertificateIsSignedByCa(t, apiClientCert, caCert)
+	certstestutil.AssertCertificateIsSignedByCa(t, apiKubeletClientCert, caCert)
-	certstestutil.AssertCertificateHasClientAuthUsage(t, apiClientCert)
+	certstestutil.AssertCertificateHasClientAuthUsage(t, apiKubeletClientCert)
-	certstestutil.AssertCertificateHasOrganizations(t, apiClientCert, kubeadmconstants.MastersGroup)
+	certstestutil.AssertCertificateHasOrganizations(t, apiKubeletClientCert, kubeadmconstants.MastersGroup)
+}
+
+func TestNewEtcdServerCertAndKey(t *testing.T) {
+	proxy := "user-etcd-proxy"
+	proxyIP := "10.10.10.100"
+
+	cfg := &kubeadmapi.MasterConfiguration{
+		Etcd: kubeadmapi.Etcd{
+			ServerCertSANs: []string{
+				proxy,
+				proxyIP,
+			},
+		},
+	}
+	caCert, caKey, err := NewCACertAndKey()
+	if err != nil {
+		t.Fatalf("failed creation of ca cert and key: %v", err)
+	}
+
+	etcdServerCert, _, err := NewEtcdServerCertAndKey(cfg, caCert, caKey)
+	if err != nil {
+		t.Fatalf("failed creation of cert and key: %v", err)
+	}
+
+	certstestutil.AssertCertificateIsSignedByCa(t, etcdServerCert, caCert)
+	certstestutil.AssertCertificateHasServerAuthUsage(t, etcdServerCert)
+	certstestutil.AssertCertificateHasDNSNames(t, etcdServerCert, "localhost", proxy)
+	certstestutil.AssertCertificateHasIPAddresses(t, etcdServerCert, net.ParseIP("127.0.0.1"), net.ParseIP(proxyIP))
+}
+
+func TestNewEtcdPeerCertAndKey(t *testing.T) {
+	hostname := "valid-hostname"
+	proxy := "user-etcd-proxy"
+	proxyIP := "10.10.10.100"
+
+	advertiseAddresses := []string{"1.2.3.4", "1:2:3::4"}
+	for _, addr := range advertiseAddresses {
+		cfg := &kubeadmapi.MasterConfiguration{
+			API:      kubeadmapi.API{AdvertiseAddress: addr},
+			NodeName: hostname,
+			Etcd: kubeadmapi.Etcd{
+				PeerCertSANs: []string{
+					proxy,
+					proxyIP,
+				},
+			},
+		}
+		caCert, caKey, err := NewCACertAndKey()
+		if err != nil {
+			t.Fatalf("failed creation of ca cert and key: %v", err)
+		}
+
+		etcdPeerCert, _, err := NewEtcdPeerCertAndKey(cfg, caCert, caKey)
+		if err != nil {
+			t.Fatalf("failed creation of cert and key: %v", err)
+		}
+
+		certstestutil.AssertCertificateIsSignedByCa(t, etcdPeerCert, caCert)
+		certstestutil.AssertCertificateHasServerAuthUsage(t, etcdPeerCert)
+		certstestutil.AssertCertificateHasClientAuthUsage(t, etcdPeerCert)
+		certstestutil.AssertCertificateHasDNSNames(t, etcdPeerCert, hostname, proxy)
+		certstestutil.AssertCertificateHasIPAddresses(t, etcdPeerCert, net.ParseIP(addr), net.ParseIP(proxyIP))
+	}
+}
+
+func TestNewAPIServerEtcdClientCertAndKey(t *testing.T) {
+	caCert, caKey, err := NewCACertAndKey()
+	if err != nil {
+		t.Fatalf("failed creation of ca cert and key: %v", err)
+	}
+
+	apiEtcdClientCert, _, err := NewAPIServerEtcdClientCertAndKey(caCert, caKey)
+	if err != nil {
+		t.Fatalf("failed creation of cert and key: %v", err)
+	}
+
+	certstestutil.AssertCertificateIsSignedByCa(t, apiEtcdClientCert, caCert)
+	certstestutil.AssertCertificateHasClientAuthUsage(t, apiEtcdClientCert)
+	certstestutil.AssertCertificateHasOrganizations(t, apiEtcdClientCert, kubeadmconstants.MastersGroup)
 }
 
 func TestNewNewServiceAccountSigningKey(t *testing.T) {
@@ -551,6 +583,9 @@ func TestCreateCertificateFilesMethods(t *testing.T) {
 				kubeadmconstants.CACertName, kubeadmconstants.CAKeyName,
 				kubeadmconstants.APIServerCertName, kubeadmconstants.APIServerKeyName,
 				kubeadmconstants.APIServerKubeletClientCertName, kubeadmconstants.APIServerKubeletClientKeyName,
+				kubeadmconstants.EtcdServerCertName, kubeadmconstants.EtcdServerKeyName,
+				kubeadmconstants.EtcdPeerCertName, kubeadmconstants.EtcdPeerKeyName,
+				kubeadmconstants.APIServerEtcdClientCertName, kubeadmconstants.APIServerEtcdClientKeyName,
 				kubeadmconstants.ServiceAccountPrivateKeyName, kubeadmconstants.ServiceAccountPublicKeyName,
 				kubeadmconstants.FrontProxyCACertName, kubeadmconstants.FrontProxyCAKeyName,
 				kubeadmconstants.FrontProxyClientCertName, kubeadmconstants.FrontProxyClientKeyName,
@@ -570,6 +605,21 @@ func TestCreateCertificateFilesMethods(t *testing.T) {
 			createFunc:    CreateAPIServerKubeletClientCertAndKeyFiles,
 			expectedFiles: []string{kubeadmconstants.APIServerKubeletClientCertName, kubeadmconstants.APIServerKubeletClientKeyName},
 		},
+		{
+			setupFunc:     CreateCACertAndKeyfiles,
+			createFunc:    CreateEtcdServerCertAndKeyFiles,
+			expectedFiles: []string{kubeadmconstants.EtcdServerCertName, kubeadmconstants.EtcdServerKeyName},
+		},
+		{
+			setupFunc:     CreateCACertAndKeyfiles,
+			createFunc:    CreateEtcdPeerCertAndKeyFiles,
+			expectedFiles: []string{kubeadmconstants.EtcdPeerCertName, kubeadmconstants.EtcdPeerKeyName},
+		},
+		{
+			setupFunc:     CreateCACertAndKeyfiles,
+			createFunc:    CreateAPIServerEtcdClientCertAndKeyFiles,
+			expectedFiles: []string{kubeadmconstants.APIServerEtcdClientCertName, kubeadmconstants.APIServerEtcdClientKeyName},
+		},
 		{
 			createFunc:    CreateServiceAccountKeyAndPublicKeyFiles,
 			expectedFiles: []string{kubeadmconstants.ServiceAccountPrivateKeyName, kubeadmconstants.ServiceAccountPublicKeyName},

cmd/kubeadm/app/phases/certs/doc.go

@@ -23,7 +23,9 @@ package certs
 	INPUTS:
 		From MasterConfiguration
 			.API.AdvertiseAddress is an optional parameter that can be passed for an extra addition to the SAN IPs
-			.APIServerCertSANs is needed for knowing which DNS names and IPs the API Server serving cert should be valid for
+			.APIServerCertSANs is an optional parameter for adding DNS names and IPs to the API Server serving cert SAN
+			.Etcd.ServerCertSANs is an optional parameter for adding DNS names and IPs to the etcd serving cert SAN
+			.Etcd.PeerCertSANs is an optional parameter for adding DNS names and IPs to the etcd peer cert SAN
 			.Networking.DNSDomain is needed for knowing which DNS name the internal kubernetes service has
 			.Networking.ServiceSubnet is needed for knowing which IP the internal kubernetes service is going to point to
 			.CertificatesDir is required for knowing where all certificates should be stored
@@ -36,6 +38,12 @@ package certs
 		 - apiserver.key
 		 - apiserver-kubelet-client.crt
 		 - apiserver-kubelet-client.key
+		 - apiserver-etcd-client.crt
+		 - apiserver-etcd-client.key
+		 - etcd/server.crt
+		 - etcd/server.key
+		 - etcd/peer.crt
+		 - etcd/peer.key
 		 - sa.pub
 		 - sa.key
 		 - front-proxy-ca.crt

cmd/kubeadm/app/phases/certs/pkiutil/BUILD

@@ -10,14 +10,23 @@ go_test(
     name = "go_default_test",
     srcs = ["pki_helpers_test.go"],
     embed = [":go_default_library"],
-    deps = ["//vendor/k8s.io/client-go/util/cert:go_default_library"],
+    deps = [
+        "//cmd/kubeadm/app/apis/kubeadm:go_default_library",
+        "//vendor/k8s.io/client-go/util/cert:go_default_library",
+    ],
 )
 
 go_library(
     name = "go_default_library",
     srcs = ["pki_helpers.go"],
     importpath = "k8s.io/kubernetes/cmd/kubeadm/app/phases/certs/pkiutil",
-    deps = ["//vendor/k8s.io/client-go/util/cert:go_default_library"],
+    deps = [
+        "//cmd/kubeadm/app/apis/kubeadm:go_default_library",
+        "//cmd/kubeadm/app/constants:go_default_library",
+        "//pkg/registry/core/service/ipallocator:go_default_library",
+        "//vendor/k8s.io/apimachinery/pkg/util/validation:go_default_library",
+        "//vendor/k8s.io/client-go/util/cert:go_default_library",
+    ],
 )
 
 filegroup(

cmd/kubeadm/app/phases/certs/pkiutil/pki_helpers.go

@@ -20,11 +20,16 @@ import (
 	"crypto/rsa"
 	"crypto/x509"
 	"fmt"
+	"net"
 	"os"
 	"path/filepath"
 	"time"
 
+	"k8s.io/apimachinery/pkg/util/validation"
 	certutil "k8s.io/client-go/util/cert"
+	kubeadmapi "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm"
+	kubeadmconstants "k8s.io/kubernetes/cmd/kubeadm/app/constants"
+	"k8s.io/kubernetes/pkg/registry/core/service/ipallocator"
 )
 
 // NewCertificateAuthority creates new certificate and private key for the certificate authority
@@ -246,3 +251,106 @@ func pathForKey(pkiPath, name string) string {
 func pathForPublicKey(pkiPath, name string) string {
 	return filepath.Join(pkiPath, fmt.Sprintf("%s.pub", name))
 }
+
+// GetAPIServerAltNames builds an AltNames object for to be used when generating apiserver certificate
+func GetAPIServerAltNames(cfg *kubeadmapi.MasterConfiguration) (*certutil.AltNames, error) {
+	// advertise address
+	advertiseAddress := net.ParseIP(cfg.API.AdvertiseAddress)
+	if advertiseAddress == nil {
+		return nil, fmt.Errorf("error parsing API AdvertiseAddress %v: is not a valid textual representation of an IP address", cfg.API.AdvertiseAddress)
+	}
+
+	// internal IP address for the API server
+	_, svcSubnet, err := net.ParseCIDR(cfg.Networking.ServiceSubnet)
+	if err != nil {
+		return nil, fmt.Errorf("error parsing CIDR %q: %v", cfg.Networking.ServiceSubnet, err)
+	}
+
+	internalAPIServerVirtualIP, err := ipallocator.GetIndexedIP(svcSubnet, 1)
+	if err != nil {
+		return nil, fmt.Errorf("unable to get first IP address from the given CIDR (%s): %v", svcSubnet.String(), err)
+	}
+
+	// create AltNames with defaults DNSNames/IPs
+	altNames := &certutil.AltNames{
+		DNSNames: []string{
+			cfg.NodeName,
+			"kubernetes",
+			"kubernetes.default",
+			"kubernetes.default.svc",
+			fmt.Sprintf("kubernetes.default.svc.%s", cfg.Networking.DNSDomain),
+		},
+		IPs: []net.IP{
+			internalAPIServerVirtualIP,
+			advertiseAddress,
+		},
+	}
+
+	// add api server dns advertise address
+	if len(cfg.API.ControlPlaneEndpoint) > 0 {
+		altNames.DNSNames = append(altNames.DNSNames, cfg.API.ControlPlaneEndpoint)
+	}
+
+	appendSANsToAltNames(altNames, cfg.APIServerCertSANs, kubeadmconstants.APIServerCertName)
+
+	return altNames, nil
+}
+
+// GetEtcdAltNames builds an AltNames object for generating the etcd server certificate.
+// `localhost` is included in the SAN since this is the interface the etcd static pod listens on.
+// Hostname and `API.AdvertiseAddress` are excluded since etcd does not listen on this interface by default.
+// The user can override the listen address with `Etcd.ExtraArgs` and add SANs with `Etcd.ServerCertSANs`.
+func GetEtcdAltNames(cfg *kubeadmapi.MasterConfiguration) (*certutil.AltNames, error) {
+	// create AltNames with defaults DNSNames/IPs
+	altNames := &certutil.AltNames{
+		DNSNames: []string{"localhost"},
+		IPs:      []net.IP{net.IPv4(127, 0, 0, 1)},
+	}
+
+	appendSANsToAltNames(altNames, cfg.Etcd.ServerCertSANs, kubeadmconstants.EtcdServerCertName)
+
+	return altNames, nil
+}
+
+// GetEtcdPeerAltNames builds an AltNames object for generating the etcd peer certificate.
+// `localhost` is excluded from the SAN since etcd will not refer to itself as a peer.
+// Hostname and `API.AdvertiseAddress` are included if the user chooses to promote the single node etcd cluster into a multi-node one.
+// The user can override the listen address with `Etcd.ExtraArgs` and add SANs with `Etcd.PeerCertSANs`.
+func GetEtcdPeerAltNames(cfg *kubeadmapi.MasterConfiguration) (*certutil.AltNames, error) {
+	// advertise address
+	advertiseAddress := net.ParseIP(cfg.API.AdvertiseAddress)
+	if advertiseAddress == nil {
+		return nil, fmt.Errorf("error parsing API AdvertiseAddress %v: is not a valid textual representation of an IP address", cfg.API.AdvertiseAddress)
+	}
+
+	// create AltNames with defaults DNSNames/IPs
+	altNames := &certutil.AltNames{
+		DNSNames: []string{cfg.NodeName},
+		IPs:      []net.IP{advertiseAddress},
+	}
+
+	appendSANsToAltNames(altNames, cfg.Etcd.PeerCertSANs, kubeadmconstants.EtcdPeerCertName)
+
+	return altNames, nil
+}
+
+// appendSANsToAltNames parses SANs from as list of strings and adds them to altNames for use on a specific cert
+// altNames is passed in with a pointer, and the struct is modified
+// valid IP address strings are parsed and added to altNames.IPs as net.IP's
+// RFC-1123 compliant DNS strings are added to altNames.DNSNames as strings
+// certNames is used to print user facing warnings and should be the name of the cert the altNames will be used for
+func appendSANsToAltNames(altNames *certutil.AltNames, SANs []string, certName string) {
+	for _, altname := range SANs {
+		if ip := net.ParseIP(altname); ip != nil {
+			altNames.IPs = append(altNames.IPs, ip)
+		} else if len(validation.IsDNS1123Subdomain(altname)) == 0 {
+			altNames.DNSNames = append(altNames.DNSNames, altname)
+		} else {
+			fmt.Printf(
+				"[certificates] WARNING: '%s' was not added to the '%s' SAN, because it is not a valid IP or RFC-1123 compliant DNS entry\n",
+				altname,
+				certName,
+			)
+		}
+	}
+}

cmd/kubeadm/app/phases/certs/pkiutil/pki_helpers_test.go

@@ -21,10 +21,12 @@ import (
 	"crypto/rsa"
 	"crypto/x509"
 	"io/ioutil"
+	"net"
 	"os"
 	"testing"
 
 	certutil "k8s.io/client-go/util/cert"
+	kubeadmapi "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm"
 )
 
 func TestNewCertificateAuthority(t *testing.T) {
@@ -432,3 +434,154 @@ func TestPathForPublicKey(t *testing.T) {
 		t.Errorf("unexpected certificate path: %s", pubPath)
 	}
 }
+
+func TestGetAPIServerAltNames(t *testing.T) {
+	hostname := "valid-hostname"
+	advertiseIP := "1.2.3.4"
+	controlPlaneEndpoint := "api.k8s.io"
+	cfg := &kubeadmapi.MasterConfiguration{
+		API:               kubeadmapi.API{AdvertiseAddress: advertiseIP, ControlPlaneEndpoint: controlPlaneEndpoint},
+		Networking:        kubeadmapi.Networking{ServiceSubnet: "10.96.0.0/12", DNSDomain: "cluster.local"},
+		NodeName:          hostname,
+		APIServerCertSANs: []string{"10.1.245.94", "10.1.245.95", "1.2.3.L", "invalid,commas,in,DNS"},
+	}
+
+	altNames, err := GetAPIServerAltNames(cfg)
+	if err != nil {
+		t.Fatalf("failed calling GetAPIServerAltNames: %v", err)
+	}
+
+	expectedDNSNames := []string{hostname, "kubernetes", "kubernetes.default", "kubernetes.default.svc", "kubernetes.default.svc.cluster.local", controlPlaneEndpoint}
+	for _, DNSName := range expectedDNSNames {
+		found := false
+		for _, val := range altNames.DNSNames {
+			if val == DNSName {
+				found = true
+				break
+			}
+		}
+
+		if !found {
+			t.Errorf("altNames does not contain DNSName %s", DNSName)
+		}
+	}
+
+	expectedIPAddresses := []string{"10.96.0.1", advertiseIP, "10.1.245.94", "10.1.245.95"}
+	for _, IPAddress := range expectedIPAddresses {
+		found := false
+		for _, val := range altNames.IPs {
+			if val.Equal(net.ParseIP(IPAddress)) {
+				found = true
+				break
+			}
+		}
+
+		if !found {
+			t.Errorf("altNames does not contain IPAddress %s", IPAddress)
+		}
+	}
+}
+
+func TestGetEtcdAltNames(t *testing.T) {
+	proxy := "user-etcd-proxy"
+	proxyIP := "10.10.10.100"
+	cfg := &kubeadmapi.MasterConfiguration{
+		Etcd: kubeadmapi.Etcd{
+			ServerCertSANs: []string{
+				proxy,
+				proxyIP,
+				"1.2.3.L",
+				"invalid,commas,in,DNS",
+			},
+		},
+	}
+
+	altNames, err := GetEtcdAltNames(cfg)
+	if err != nil {
+		t.Fatalf("failed calling GetEtcdAltNames: %v", err)
+	}
+
+	expectedDNSNames := []string{"localhost", proxy}
+	for _, DNSName := range expectedDNSNames {
+		found := false
+		for _, val := range altNames.DNSNames {
+			if val == DNSName {
+				found = true
+				break
+			}
+		}
+
+		if !found {
+			t.Errorf("altNames does not contain DNSName %s", DNSName)
+		}
+	}
+
+	expectedIPAddresses := []string{"127.0.0.1", proxyIP}
+	for _, IPAddress := range expectedIPAddresses {
+		found := false
+		for _, val := range altNames.IPs {
+			if val.Equal(net.ParseIP(IPAddress)) {
+				found = true
+				break
+			}
+		}
+
+		if !found {
+			t.Errorf("altNames does not contain IPAddress %s", IPAddress)
+		}
+	}
+}
+
+func TestGetEtcdPeerAltNames(t *testing.T) {
+	hostname := "valid-hostname"
+	proxy := "user-etcd-proxy"
+	proxyIP := "10.10.10.100"
+	advertiseIP := "1.2.3.4"
+	cfg := &kubeadmapi.MasterConfiguration{
+		API:      kubeadmapi.API{AdvertiseAddress: advertiseIP},
+		NodeName: hostname,
+		Etcd: kubeadmapi.Etcd{
+			PeerCertSANs: []string{
+				proxy,
+				proxyIP,
+				"1.2.3.L",
+				"invalid,commas,in,DNS",
+			},
+		},
+	}
+
+	altNames, err := GetEtcdPeerAltNames(cfg)
+	if err != nil {
+		t.Fatalf("failed calling GetEtcdPeerAltNames: %v", err)
+	}
+
+	expectedDNSNames := []string{hostname, proxy}
+	for _, DNSName := range expectedDNSNames {
+		found := false
+		for _, val := range altNames.DNSNames {
+			if val == DNSName {
+				found = true
+				break
+			}
+		}
+
+		if !found {
+			t.Errorf("altNames does not contain DNSName %s", DNSName)
+		}
+	}
+
+	expectedIPAddresses := []string{advertiseIP, proxyIP}
+	for _, IPAddress := range expectedIPAddresses {
+		found := false
+		for _, val := range altNames.IPs {
+			if val.Equal(net.ParseIP(IPAddress)) {
+				found = true
+				break
+			}
+		}
+
+		if !found {
+			t.Errorf("altNames does not contain IPAddress %s", IPAddress)
+		}
+	}
+}

cmd/kubeadm/app/phases/controlplane/manifests.go

@@ -190,21 +190,37 @@ func getAPIServerCommand(cfg *kubeadmapi.MasterConfiguration, k8sVersion *versio
 	command = append(command, kubeadmutil.BuildArgumentListFromMap(defaultArguments, cfg.APIServerExtraArgs)...)
 	command = append(command, getAuthzParameters(cfg.AuthorizationModes)...)
 
-	// Check if the user decided to use an external etcd cluster
+	// If the user set endpoints for an external etcd cluster
 	if len(cfg.Etcd.Endpoints) > 0 {
 		command = append(command, fmt.Sprintf("--etcd-servers=%s", strings.Join(cfg.Etcd.Endpoints, ",")))
-	} else {
-		command = append(command, "--etcd-servers=http://127.0.0.1:2379")
-	}
 
-	// Is etcd secured?
+		// Use any user supplied etcd certificates
-	if cfg.Etcd.CAFile != "" {
+		if cfg.Etcd.CAFile != "" {
-		command = append(command, fmt.Sprintf("--etcd-cafile=%s", cfg.Etcd.CAFile))
+			command = append(command, fmt.Sprintf("--etcd-cafile=%s", cfg.Etcd.CAFile))
-	}
+		}
-	if cfg.Etcd.CertFile != "" && cfg.Etcd.KeyFile != "" {
+		if cfg.Etcd.CertFile != "" && cfg.Etcd.KeyFile != "" {
-		etcdClientFileArg := fmt.Sprintf("--etcd-certfile=%s", cfg.Etcd.CertFile)
+			etcdClientFileArg := fmt.Sprintf("--etcd-certfile=%s", cfg.Etcd.CertFile)
-		etcdKeyFileArg := fmt.Sprintf("--etcd-keyfile=%s", cfg.Etcd.KeyFile)
+			etcdKeyFileArg := fmt.Sprintf("--etcd-keyfile=%s", cfg.Etcd.KeyFile)
-		command = append(command, etcdClientFileArg, etcdKeyFileArg)
+			command = append(command, etcdClientFileArg, etcdKeyFileArg)
+		}
+	} else {
+		// Default to etcd static pod on localhost
+		etcdEndpointsArg := "--etcd-servers=https://127.0.0.1:2379"
+		etcdCAFileArg := fmt.Sprintf("--etcd-cafile=%s", filepath.Join(cfg.CertificatesDir, kubeadmconstants.CACertName))
+		etcdClientFileArg := fmt.Sprintf("--etcd-certfile=%s", filepath.Join(cfg.CertificatesDir, kubeadmconstants.APIServerEtcdClientCertName))
+		etcdKeyFileArg := fmt.Sprintf("--etcd-keyfile=%s", filepath.Join(cfg.CertificatesDir, kubeadmconstants.APIServerEtcdClientKeyName))
+		command = append(command, etcdEndpointsArg, etcdCAFileArg, etcdClientFileArg, etcdKeyFileArg)
+
+		// Warn for unused user supplied variables
+		if cfg.Etcd.CAFile != "" {
+			fmt.Printf("[controlplane] WARNING: Configuration for %s CAFile, %s, is unused without providing Endpoints for external %s\n", kubeadmconstants.Etcd, cfg.Etcd.CAFile, kubeadmconstants.Etcd)
+		}
+		if cfg.Etcd.CertFile != "" {
+			fmt.Printf("[controlplane] WARNING: Configuration for %s CertFile, %s, is unused without providing Endpoints for external %s\n", kubeadmconstants.Etcd, cfg.Etcd.CertFile, kubeadmconstants.Etcd)
+		}
+		if cfg.Etcd.KeyFile != "" {
+			fmt.Printf("[controlplane] WARNING: Configuration for %s KeyFile, %s, is unused without providing Endpoints for external %s\n", kubeadmconstants.Etcd, cfg.Etcd.KeyFile, kubeadmconstants.Etcd)
+		}
 	}
 
 	if cfg.CloudProvider != "" {

cmd/kubeadm/app/phases/controlplane/manifests_test.go

@@ -224,7 +224,10 @@ func TestGetAPIServerCommand(t *testing.T) {
 				"--requestheader-allowed-names=front-proxy-client",
 				"--authorization-mode=Node,RBAC",
 				"--advertise-address=1.2.3.4",
-				"--etcd-servers=http://127.0.0.1:2379",
+				"--etcd-servers=https://127.0.0.1:2379",
+				"--etcd-cafile=" + testCertsDir + "/ca.crt",
+				"--etcd-certfile=" + testCertsDir + "/apiserver-etcd-client.crt",
+				"--etcd-keyfile=" + testCertsDir + "/apiserver-etcd-client.key",
 			},
 		},
 		{
@@ -258,7 +261,10 @@ func TestGetAPIServerCommand(t *testing.T) {
 				"--requestheader-allowed-names=front-proxy-client",
 				"--authorization-mode=Node,RBAC",
 				"--advertise-address=1.2.3.4",
-				"--etcd-servers=http://127.0.0.1:2379",
+				"--etcd-servers=https://127.0.0.1:2379",
+				"--etcd-cafile=" + testCertsDir + "/ca.crt",
+				"--etcd-certfile=" + testCertsDir + "/apiserver-etcd-client.crt",
+				"--etcd-keyfile=" + testCertsDir + "/apiserver-etcd-client.key",
 			},
 		},
 		{
@@ -292,7 +298,10 @@ func TestGetAPIServerCommand(t *testing.T) {
 				"--requestheader-allowed-names=front-proxy-client",
 				"--authorization-mode=Node,RBAC",
 				"--advertise-address=4.3.2.1",
-				"--etcd-servers=http://127.0.0.1:2379",
+				"--etcd-servers=https://127.0.0.1:2379",
+				"--etcd-cafile=" + testCertsDir + "/ca.crt",
+				"--etcd-certfile=" + testCertsDir + "/apiserver-etcd-client.crt",
+				"--etcd-keyfile=" + testCertsDir + "/apiserver-etcd-client.key",
 			},
 		},
 		{
@@ -327,9 +336,10 @@ func TestGetAPIServerCommand(t *testing.T) {
 				"--requestheader-allowed-names=front-proxy-client",
 				"--authorization-mode=Node,RBAC",
 				"--advertise-address=4.3.2.1",
-				"--etcd-servers=http://127.0.0.1:2379",
+				"--etcd-servers=https://127.0.0.1:2379",
-				"--etcd-certfile=fiz",
+				"--etcd-cafile=" + testCertsDir + "/ca.crt",
-				"--etcd-keyfile=faz",
+				"--etcd-certfile=" + testCertsDir + "/apiserver-etcd-client.crt",
+				"--etcd-keyfile=" + testCertsDir + "/apiserver-etcd-client.key",
 			},
 		},
 		{
@@ -369,9 +379,10 @@ func TestGetAPIServerCommand(t *testing.T) {
 				"--requestheader-allowed-names=front-proxy-client",
 				"--authorization-mode=Node,RBAC",
 				"--advertise-address=4.3.2.1",
-				"--etcd-servers=http://127.0.0.1:2379",
+				"--etcd-servers=https://127.0.0.1:2379",
-				"--etcd-certfile=fiz",
+				"--etcd-cafile=" + testCertsDir + "/ca.crt",
-				"--etcd-keyfile=faz",
+				"--etcd-certfile=" + testCertsDir + "/apiserver-etcd-client.crt",
+				"--etcd-keyfile=" + testCertsDir + "/apiserver-etcd-client.key",
 			},
 		},
 		{
@@ -406,9 +417,10 @@ func TestGetAPIServerCommand(t *testing.T) {
 				"--requestheader-allowed-names=front-proxy-client",
 				"--authorization-mode=Node,RBAC",
 				"--advertise-address=2001:db8::1",
-				"--etcd-servers=http://127.0.0.1:2379",
+				"--etcd-servers=https://127.0.0.1:2379",
-				"--etcd-certfile=fiz",
+				"--etcd-cafile=" + testCertsDir + "/ca.crt",
-				"--etcd-keyfile=faz",
+				"--etcd-certfile=" + testCertsDir + "/apiserver-etcd-client.crt",
+				"--etcd-keyfile=" + testCertsDir + "/apiserver-etcd-client.key",
 			},
 		},
 		{
@@ -443,9 +455,123 @@ func TestGetAPIServerCommand(t *testing.T) {
 				"--requestheader-allowed-names=front-proxy-client",
 				"--authorization-mode=Node,RBAC",
 				"--advertise-address=2001:db8::1",
-				"--etcd-servers=http://127.0.0.1:2379",
+				"--etcd-servers=https://127.0.0.1:2379",
+				"--etcd-cafile=" + testCertsDir + "/ca.crt",
+				"--etcd-certfile=" + testCertsDir + "/apiserver-etcd-client.crt",
+				"--etcd-keyfile=" + testCertsDir + "/apiserver-etcd-client.key",
+			},
+		},
+		{
+			cfg: &kubeadmapi.MasterConfiguration{
+				API:               kubeadmapi.API{BindPort: 123, AdvertiseAddress: "2001:db8::1"},
+				Networking:        kubeadmapi.Networking{ServiceSubnet: "bar"},
+				FeatureGates:      map[string]bool{features.HighAvailability: true},
+				Etcd:              kubeadmapi.Etcd{Endpoints: []string{"https://8.6.4.1:2379", "https://8.6.4.2:2379"}, CAFile: "fuz", CertFile: "fiz", KeyFile: "faz"},
+				CertificatesDir:   testCertsDir,
+				KubernetesVersion: "v1.9.0-beta.0",
+			},
+			expected: []string{
+				"kube-apiserver",
+				"--insecure-port=0",
+				"--admission-control=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,MutatingAdmissionWebhook,ValidatingAdmissionWebhook,ResourceQuota",
+				"--service-cluster-ip-range=bar",
+				"--service-account-key-file=" + testCertsDir + "/sa.pub",
+				"--client-ca-file=" + testCertsDir + "/ca.crt",
+				"--tls-cert-file=" + testCertsDir + "/apiserver.crt",
+				"--tls-private-key-file=" + testCertsDir + "/apiserver.key",
+				"--kubelet-client-certificate=" + testCertsDir + "/apiserver-kubelet-client.crt",
+				"--kubelet-client-key=" + testCertsDir + "/apiserver-kubelet-client.key",
+				fmt.Sprintf("--secure-port=%d", 123),
+				"--allow-privileged=true",
+				"--kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname",
+				"--enable-bootstrap-token-auth=true",
+				"--proxy-client-cert-file=/var/lib/certs/front-proxy-client.crt",
+				"--proxy-client-key-file=/var/lib/certs/front-proxy-client.key",
+				"--requestheader-username-headers=X-Remote-User",
+				"--requestheader-group-headers=X-Remote-Group",
+				"--requestheader-extra-headers-prefix=X-Remote-Extra-",
+				"--requestheader-client-ca-file=" + testCertsDir + "/front-proxy-ca.crt",
+				"--requestheader-allowed-names=front-proxy-client",
+				"--authorization-mode=Node,RBAC",
+				"--advertise-address=2001:db8::1",
+				"--etcd-servers=https://8.6.4.1:2379,https://8.6.4.2:2379",
+				"--etcd-cafile=fuz",
 				"--etcd-certfile=fiz",
 				"--etcd-keyfile=faz",
+				fmt.Sprintf("--endpoint-reconciler-type=%s", reconcilers.LeaseEndpointReconcilerType),
+			},
+		},
+		{
+			cfg: &kubeadmapi.MasterConfiguration{
+				API:               kubeadmapi.API{BindPort: 123, AdvertiseAddress: "2001:db8::1"},
+				Networking:        kubeadmapi.Networking{ServiceSubnet: "bar"},
+				Etcd:              kubeadmapi.Etcd{Endpoints: []string{"http://127.0.0.1:2379", "http://127.0.0.1:2380"}},
+				CertificatesDir:   testCertsDir,
+				KubernetesVersion: "v1.9.0-beta.0",
+			},
+			expected: []string{
+				"kube-apiserver",
+				"--insecure-port=0",
+				"--admission-control=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,MutatingAdmissionWebhook,ValidatingAdmissionWebhook,ResourceQuota",
+				"--service-cluster-ip-range=bar",
+				"--service-account-key-file=" + testCertsDir + "/sa.pub",
+				"--client-ca-file=" + testCertsDir + "/ca.crt",
+				"--tls-cert-file=" + testCertsDir + "/apiserver.crt",
+				"--tls-private-key-file=" + testCertsDir + "/apiserver.key",
+				"--kubelet-client-certificate=" + testCertsDir + "/apiserver-kubelet-client.crt",
+				"--kubelet-client-key=" + testCertsDir + "/apiserver-kubelet-client.key",
+				fmt.Sprintf("--secure-port=%d", 123),
+				"--allow-privileged=true",
+				"--kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname",
+				"--enable-bootstrap-token-auth=true",
+				"--proxy-client-cert-file=/var/lib/certs/front-proxy-client.crt",
+				"--proxy-client-key-file=/var/lib/certs/front-proxy-client.key",
+				"--requestheader-username-headers=X-Remote-User",
+				"--requestheader-group-headers=X-Remote-Group",
+				"--requestheader-extra-headers-prefix=X-Remote-Extra-",
+				"--requestheader-client-ca-file=" + testCertsDir + "/front-proxy-ca.crt",
+				"--requestheader-allowed-names=front-proxy-client",
+				"--authorization-mode=Node,RBAC",
+				"--advertise-address=2001:db8::1",
+				"--etcd-servers=http://127.0.0.1:2379,http://127.0.0.1:2380",
+			},
+		},
+		{
+			cfg: &kubeadmapi.MasterConfiguration{
+				API:               kubeadmapi.API{BindPort: 123, AdvertiseAddress: "2001:db8::1"},
+				Networking:        kubeadmapi.Networking{ServiceSubnet: "bar"},
+				Etcd:              kubeadmapi.Etcd{CAFile: "fuz"},
+				CertificatesDir:   testCertsDir,
+				KubernetesVersion: "v1.9.0-beta.0",
+			},
+			expected: []string{
+				"kube-apiserver",
+				"--insecure-port=0",
+				"--admission-control=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,MutatingAdmissionWebhook,ValidatingAdmissionWebhook,ResourceQuota",
+				"--service-cluster-ip-range=bar",
+				"--service-account-key-file=" + testCertsDir + "/sa.pub",
+				"--client-ca-file=" + testCertsDir + "/ca.crt",
+				"--tls-cert-file=" + testCertsDir + "/apiserver.crt",
+				"--tls-private-key-file=" + testCertsDir + "/apiserver.key",
+				"--kubelet-client-certificate=" + testCertsDir + "/apiserver-kubelet-client.crt",
+				"--kubelet-client-key=" + testCertsDir + "/apiserver-kubelet-client.key",
+				fmt.Sprintf("--secure-port=%d", 123),
+				"--allow-privileged=true",
+				"--kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname",
+				"--enable-bootstrap-token-auth=true",
+				"--proxy-client-cert-file=/var/lib/certs/front-proxy-client.crt",
+				"--proxy-client-key-file=/var/lib/certs/front-proxy-client.key",
+				"--requestheader-username-headers=X-Remote-User",
+				"--requestheader-group-headers=X-Remote-Group",
+				"--requestheader-extra-headers-prefix=X-Remote-Extra-",
+				"--requestheader-client-ca-file=" + testCertsDir + "/front-proxy-ca.crt",
+				"--requestheader-allowed-names=front-proxy-client",
+				"--authorization-mode=Node,RBAC",
+				"--advertise-address=2001:db8::1",
+				"--etcd-servers=https://127.0.0.1:2379",
+				"--etcd-cafile=" + testCertsDir + "/ca.crt",
+				"--etcd-certfile=" + testCertsDir + "/apiserver-etcd-client.crt",
+				"--etcd-keyfile=" + testCertsDir + "/apiserver-etcd-client.key",
 			},
 		},
 		{
@@ -483,7 +609,10 @@ func TestGetAPIServerCommand(t *testing.T) {
 				"--requestheader-allowed-names=front-proxy-client",
 				"--authorization-mode=Node,RBAC",
 				"--advertise-address=2001:db8::1",
-				"--etcd-servers=http://127.0.0.1:2379",
+				"--etcd-servers=https://127.0.0.1:2379",
+				"--etcd-cafile=" + testCertsDir + "/ca.crt",
+				"--etcd-certfile=" + testCertsDir + "/apiserver-etcd-client.crt",
+				"--etcd-keyfile=" + testCertsDir + "/apiserver-etcd-client.key",
 				fmt.Sprintf("--endpoint-reconciler-type=%s", reconcilers.LeaseEndpointReconcilerType),
 				"--audit-policy-file=/etc/kubernetes/audit/audit.yaml",
 				"--audit-log-path=/var/log/kubernetes/audit/audit.log",
@@ -522,7 +651,10 @@ func TestGetAPIServerCommand(t *testing.T) {
 				"--requestheader-allowed-names=front-proxy-client",
 				"--authorization-mode=Node,RBAC",
 				"--advertise-address=1.2.3.4",
-				"--etcd-servers=http://127.0.0.1:2379",
+				"--etcd-servers=https://127.0.0.1:2379",
+				"--etcd-cafile=" + testCertsDir + "/ca.crt",
+				"--etcd-certfile=" + testCertsDir + "/apiserver-etcd-client.crt",
+				"--etcd-keyfile=" + testCertsDir + "/apiserver-etcd-client.key",
 				"--cloud-provider=gce",
 			},
 		},
@@ -558,7 +690,10 @@ func TestGetAPIServerCommand(t *testing.T) {
 				"--requestheader-allowed-names=front-proxy-client",
 				"--authorization-mode=Node,RBAC",
 				"--advertise-address=1.2.3.4",
-				"--etcd-servers=http://127.0.0.1:2379",
+				"--etcd-servers=https://127.0.0.1:2379",
+				"--etcd-cafile=" + testCertsDir + "/ca.crt",
+				"--etcd-certfile=" + testCertsDir + "/apiserver-etcd-client.crt",
+				"--etcd-keyfile=" + testCertsDir + "/apiserver-etcd-client.key",
 				"--cloud-provider=aws",
 			},
 		},

cmd/kubeadm/app/phases/etcd/local.go

@@ -18,6 +18,7 @@ package etcd
 
 import (
 	"fmt"
+	"path/filepath"
 
 	"k8s.io/api/core/v1"
 	kubeadmapi "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm"
@@ -28,7 +29,8 @@ import (
 )
 
 const (
-	etcdVolumeName = "etcd"
+	etcdVolumeName  = "etcd-data"
+	certsVolumeName = "k8s-certs"
 )
 
 // CreateLocalEtcdStaticPodManifestFile will write local etcd static pod manifest file.
@@ -50,7 +52,8 @@ func CreateLocalEtcdStaticPodManifestFile(manifestDir string, cfg *kubeadmapi.Ma
 func GetEtcdPodSpec(cfg *kubeadmapi.MasterConfiguration) v1.Pod {
 	pathType := v1.HostPathDirectoryOrCreate
 	etcdMounts := map[string]v1.Volume{
-		etcdVolumeName: staticpodutil.NewVolume(etcdVolumeName, cfg.Etcd.DataDir, &pathType),
+		etcdVolumeName:  staticpodutil.NewVolume(etcdVolumeName, cfg.Etcd.DataDir, &pathType),
+		certsVolumeName: staticpodutil.NewVolume(certsVolumeName, cfg.CertificatesDir, &pathType),
 	}
 	return staticpodutil.ComponentPod(v1.Container{
 		Name:            kubeadmconstants.Etcd,
@@ -58,7 +61,10 @@ func GetEtcdPodSpec(cfg *kubeadmapi.MasterConfiguration) v1.Pod {
 		Image:           images.GetCoreImage(kubeadmconstants.Etcd, cfg.ImageRepository, cfg.KubernetesVersion, cfg.Etcd.Image),
 		ImagePullPolicy: cfg.ImagePullPolicy,
 		// Mount the etcd datadir path read-write so etcd can store data in a more persistent manner
-		VolumeMounts:  []v1.VolumeMount{staticpodutil.NewVolumeMount(etcdVolumeName, cfg.Etcd.DataDir, false)},
+		VolumeMounts: []v1.VolumeMount{
+			staticpodutil.NewVolumeMount(etcdVolumeName, cfg.Etcd.DataDir, false),
+			staticpodutil.NewVolumeMount(certsVolumeName, cfg.CertificatesDir, false),
+		},
 		LivenessProbe: staticpodutil.ComponentProbe(cfg, kubeadmconstants.Etcd, 2379, "/health", v1.URISchemeHTTP),
 	}, etcdMounts)
 }
@@ -66,9 +72,17 @@ func GetEtcdPodSpec(cfg *kubeadmapi.MasterConfiguration) v1.Pod {
 // getEtcdCommand builds the right etcd command from the given config object
 func getEtcdCommand(cfg *kubeadmapi.MasterConfiguration) []string {
 	defaultArguments := map[string]string{
-		"listen-client-urls":    "http://127.0.0.1:2379",
+		"listen-client-urls":    "https://127.0.0.1:2379",
-		"advertise-client-urls": "http://127.0.0.1:2379",
+		"advertise-client-urls": "https://127.0.0.1:2379",
 		"data-dir":              cfg.Etcd.DataDir,
+		"cert-file":             filepath.Join(cfg.CertificatesDir, kubeadmconstants.EtcdServerCertName),
+		"key-file":              filepath.Join(cfg.CertificatesDir, kubeadmconstants.EtcdServerKeyName),
+		"trusted-ca-file":       filepath.Join(cfg.CertificatesDir, kubeadmconstants.CACertName),
+		"client-cert-auth":      "true",
+		"peer-cert-file":        filepath.Join(cfg.CertificatesDir, kubeadmconstants.EtcdPeerCertName),
+		"peer-key-file":         filepath.Join(cfg.CertificatesDir, kubeadmconstants.EtcdPeerKeyName),
+		"peer-trusted-ca-file":  filepath.Join(cfg.CertificatesDir, kubeadmconstants.CACertName),
+		"peer-client-cert-auth": "true",
 	}
 
 	command := []string{"etcd"}

cmd/kubeadm/app/phases/etcd/local_test.go

@@ -79,9 +79,17 @@ func TestGetEtcdCommand(t *testing.T) {
 			},
 			expected: []string{
 				"etcd",
-				"--listen-client-urls=http://127.0.0.1:2379",
+				"--listen-client-urls=https://127.0.0.1:2379",
-				"--advertise-client-urls=http://127.0.0.1:2379",
+				"--advertise-client-urls=https://127.0.0.1:2379",
 				"--data-dir=/var/lib/etcd",
+				"--cert-file=" + kubeadmconstants.EtcdServerCertName,
+				"--key-file=" + kubeadmconstants.EtcdServerKeyName,
+				"--trusted-ca-file=" + kubeadmconstants.CACertName,
+				"--client-cert-auth=true",
+				"--peer-cert-file=" + kubeadmconstants.EtcdPeerCertName,
+				"--peer-key-file=" + kubeadmconstants.EtcdPeerKeyName,
+				"--peer-trusted-ca-file=" + kubeadmconstants.CACertName,
+				"--peer-client-cert-auth=true",
 			},
 		},
 		{
@@ -89,16 +97,24 @@ func TestGetEtcdCommand(t *testing.T) {
 				Etcd: kubeadmapi.Etcd{
 					DataDir: "/var/lib/etcd",
 					ExtraArgs: map[string]string{
-						"listen-client-urls":    "http://10.0.1.10:2379",
+						"listen-client-urls":    "https://10.0.1.10:2379",
-						"advertise-client-urls": "http://10.0.1.10:2379",
+						"advertise-client-urls": "https://10.0.1.10:2379",
 					},
 				},
 			},
 			expected: []string{
 				"etcd",
-				"--listen-client-urls=http://10.0.1.10:2379",
+				"--listen-client-urls=https://10.0.1.10:2379",
-				"--advertise-client-urls=http://10.0.1.10:2379",
+				"--advertise-client-urls=https://10.0.1.10:2379",
 				"--data-dir=/var/lib/etcd",
+				"--cert-file=" + kubeadmconstants.EtcdServerCertName,
+				"--key-file=" + kubeadmconstants.EtcdServerKeyName,
+				"--trusted-ca-file=" + kubeadmconstants.CACertName,
+				"--client-cert-auth=true",
+				"--peer-cert-file=" + kubeadmconstants.EtcdPeerCertName,
+				"--peer-key-file=" + kubeadmconstants.EtcdPeerKeyName,
+				"--peer-trusted-ca-file=" + kubeadmconstants.CACertName,
+				"--peer-client-cert-auth=true",
 			},
 		},
 		{
@@ -107,9 +123,17 @@ func TestGetEtcdCommand(t *testing.T) {
 			},
 			expected: []string{
 				"etcd",
-				"--listen-client-urls=http://127.0.0.1:2379",
+				"--listen-client-urls=https://127.0.0.1:2379",
-				"--advertise-client-urls=http://127.0.0.1:2379",
+				"--advertise-client-urls=https://127.0.0.1:2379",
 				"--data-dir=/etc/foo",
+				"--cert-file=" + kubeadmconstants.EtcdServerCertName,
+				"--key-file=" + kubeadmconstants.EtcdServerKeyName,
+				"--trusted-ca-file=" + kubeadmconstants.CACertName,
+				"--client-cert-auth=true",
+				"--peer-cert-file=" + kubeadmconstants.EtcdPeerCertName,
+				"--peer-key-file=" + kubeadmconstants.EtcdPeerKeyName,
+				"--peer-trusted-ca-file=" + kubeadmconstants.CACertName,
+				"--peer-client-cert-auth=true",
 			},
 		},
 	}

cmd/kubeadm/app/phases/upgrade/staticpods.go

@@ -23,7 +23,8 @@ import (
 
 	kubeadmapi "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm"
 	"k8s.io/kubernetes/cmd/kubeadm/app/constants"
-	"k8s.io/kubernetes/cmd/kubeadm/app/phases/controlplane"
+	certsphase "k8s.io/kubernetes/cmd/kubeadm/app/phases/certs"
+	controlplanephase "k8s.io/kubernetes/cmd/kubeadm/app/phases/controlplane"
 	etcdphase "k8s.io/kubernetes/cmd/kubeadm/app/phases/etcd"
 	"k8s.io/kubernetes/cmd/kubeadm/app/util"
 	"k8s.io/kubernetes/cmd/kubeadm/app/util/apiclient"
@@ -133,6 +134,22 @@ func upgradeComponent(component string, waiter apiclient.Waiter, pathMgr StaticP
 	if component == constants.Etcd {
 		recoverEtcd = true
 	}
+
+	// ensure etcd certs are generated for etcd and kube-apiserver
+	if component == constants.Etcd {
+		if err := certsphase.CreateEtcdServerCertAndKeyFiles(cfg); err != nil {
+			return fmt.Errorf("failed to upgrade the %s certificate: %v", constants.Etcd, err)
+		}
+		if err := certsphase.CreateEtcdPeerCertAndKeyFiles(cfg); err != nil {
+			return fmt.Errorf("failed to upgrade the %s peer certificate: %v", constants.Etcd, err)
+		}
+	}
+	if component == constants.KubeAPIServer {
+		if err := certsphase.CreateAPIServerEtcdClientCertAndKeyFiles(cfg); err != nil {
+			return fmt.Errorf("failed to upgrade the %s %s-client certificate: %v", constants.KubeAPIServer, constants.Etcd, err)
+		}
+	}
+
 	// The old manifest is here; in the /etc/kubernetes/manifests/
 	currentManifestPath := pathMgr.RealManifestPath(component)
 	// The new, upgraded manifest will be written here
@@ -180,7 +197,7 @@ func performEtcdStaticPodUpgrade(waiter apiclient.Waiter, pathMgr StaticPodPathM
 	if len(cfg.Etcd.Endpoints) != 0 {
 		return false, fmt.Errorf("external etcd detected, won't try to change any etcd state")
 	}
-	// Checking health state of etcd before proceeding with the upgrtade
+	// Checking health state of etcd before proceeding with the upgrade
 	etcdCluster := util.LocalEtcdCluster{}
 	etcdStatus, err := etcdCluster.GetEtcdClusterStatus()
 	if err != nil {
@@ -191,7 +208,7 @@ func performEtcdStaticPodUpgrade(waiter apiclient.Waiter, pathMgr StaticPodPathM
 	backupEtcdDir := pathMgr.BackupEtcdDir()
 	runningEtcdDir := cfg.Etcd.DataDir
 	if err := util.CopyDir(runningEtcdDir, backupEtcdDir); err != nil {
-		return true, fmt.Errorf("fail to back up etcd data: %v", err)
+		return true, fmt.Errorf("failed to back up etcd data: %v", err)
 	}
 
 	// Need to check currently used version and version from constants, if differs then upgrade
@@ -215,7 +232,7 @@ func performEtcdStaticPodUpgrade(waiter apiclient.Waiter, pathMgr StaticPodPathM
 
 	beforeEtcdPodHash, err := waiter.WaitForStaticPodSingleHash(cfg.NodeName, constants.Etcd)
 	if err != nil {
-		return true, fmt.Errorf("fail to get etcd pod's hash: %v", err)
+		return true, fmt.Errorf("failed to get etcd pod's hash: %v", err)
 	}
 
 	// Write the updated etcd static Pod manifest into the temporary directory, at this point no etcd change
@@ -227,7 +244,7 @@ func performEtcdStaticPodUpgrade(waiter apiclient.Waiter, pathMgr StaticPodPathM
 	// Perform etcd upgrade using common to all control plane components function
 	if err := upgradeComponent(constants.Etcd, waiter, pathMgr, cfg, beforeEtcdPodHash, recoverManifests); err != nil {
 		// Since etcd upgrade component failed, the old manifest has been restored
-		// now we need to check the heatlth of etcd cluster if it came back up with old manifest
+		// now we need to check the health of etcd cluster if it came back up with old manifest
 		if _, err := etcdCluster.GetEtcdClusterStatus(); err != nil {
 			// At this point we know that etcd cluster is dead and it is safe to copy backup datastore and to rollback old etcd manifest
 			if err := rollbackEtcdData(cfg, fmt.Errorf("etcd cluster is not healthy after upgrade: %v rolling back", err), pathMgr); err != nil {
@@ -299,7 +316,7 @@ func StaticPodControlPlane(waiter apiclient.Waiter, pathMgr StaticPodPathManager
 
 	// Write the updated static Pod manifests into the temporary directory
 	fmt.Printf("[upgrade/staticpods] Writing new Static Pod manifests to %q\n", pathMgr.TempManifestDir())
-	err = controlplane.CreateInitStaticPodManifestFiles(pathMgr.TempManifestDir(), cfg)
+	err = controlplanephase.CreateInitStaticPodManifestFiles(pathMgr.TempManifestDir(), cfg)
 	if err != nil {
 		return fmt.Errorf("error creating init static pod manifest files: %v", err)
 	}

cmd/kubeadm/app/phases/upgrade/staticpods_test.go

@@ -29,7 +29,8 @@ import (
 	kubeadmapi "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm"
 	kubeadmapiext "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/v1alpha1"
 	"k8s.io/kubernetes/cmd/kubeadm/app/constants"
-	"k8s.io/kubernetes/cmd/kubeadm/app/phases/controlplane"
+	certsphase "k8s.io/kubernetes/cmd/kubeadm/app/phases/certs"
+	controlplanephase "k8s.io/kubernetes/cmd/kubeadm/app/phases/controlplane"
 	etcdphase "k8s.io/kubernetes/cmd/kubeadm/app/phases/etcd"
 	"k8s.io/kubernetes/cmd/kubeadm/app/util/apiclient"
 	"k8s.io/kubernetes/pkg/api/legacyscheme"
@@ -49,7 +50,7 @@ apiServerExtraArgs: null
 authorizationModes:
 - Node
 - RBAC
-certificatesDir: /etc/kubernetes/pki
+certificatesDir: %s
 cloudProvider: ""
 controllerManagerExtraArgs: null
 etcd:
@@ -60,6 +61,8 @@ etcd:
   extraArgs: null
   image: ""
   keyFile: ""
+  serverCertSANs: null
+  peerCertSANs: null
 featureFlags: null
 imageRepository: k8s.gcr.io
 kubernetesVersion: %s
@@ -305,12 +308,39 @@ func TestStaticPodControlPlane(t *testing.T) {
 		defer os.RemoveAll(pathMgr.TempManifestDir())
 		defer os.RemoveAll(pathMgr.BackupManifestDir())
 
-		oldcfg, err := getConfig("v1.7.0")
+		tempCertsDir, err := ioutil.TempDir("", "kubeadm-certs")
+		if err != nil {
+			t.Fatalf("couldn't create temporary certificates directory: %v", err)
+		}
+		defer os.RemoveAll(tempCertsDir)
+
+		oldcfg, err := getConfig("v1.7.0", tempCertsDir)
 		if err != nil {
 			t.Fatalf("couldn't create config: %v", err)
 		}
+
+		// Initialize PKI minus any etcd certificates to simulate etcd PKI upgrade
+		certActions := []func(cfg *kubeadmapi.MasterConfiguration) error{
+			certsphase.CreateCACertAndKeyfiles,
+			certsphase.CreateAPIServerCertAndKeyFiles,
+			certsphase.CreateAPIServerKubeletClientCertAndKeyFiles,
+			// certsphase.CreateEtcdServerCertAndKeyFiles,
+			// certsphase.CreateEtcdPeerCertAndKeyFiles,
+			// certsphase.CreateAPIServerEtcdClientCertAndKeyFiles,
+			certsphase.CreateServiceAccountKeyAndPublicKeyFiles,
+			certsphase.CreateFrontProxyCACertAndKeyFiles,
+			certsphase.CreateFrontProxyClientCertAndKeyFiles,
+		}
+		for _, action := range certActions {
+			err := action(oldcfg)
+			if err != nil {
+				t.Fatalf("couldn't initialize pre-upgrade certificate: %v", err)
+			}
+		}
+		fmt.Printf("Wrote certs to %s\n", oldcfg.CertificatesDir)
+
 		// Initialize the directory with v1.7 manifests; should then be upgraded to v1.8 using the method
-		err = controlplane.CreateInitStaticPodManifestFiles(pathMgr.RealManifestDir(), oldcfg)
+		err = controlplanephase.CreateInitStaticPodManifestFiles(pathMgr.RealManifestDir(), oldcfg)
 		if err != nil {
 			t.Fatalf("couldn't run CreateInitStaticPodManifestFiles: %v", err)
 		}
@@ -324,7 +354,7 @@ func TestStaticPodControlPlane(t *testing.T) {
 			t.Fatalf("couldn't read temp file: %v", err)
 		}
 
-		newcfg, err := getConfig("v1.8.0")
+		newcfg, err := getConfig("v1.8.0", tempCertsDir)
 		if err != nil {
 			t.Fatalf("couldn't create config: %v", err)
 		}
@@ -332,9 +362,10 @@ func TestStaticPodControlPlane(t *testing.T) {
 		actualErr := StaticPodControlPlane(waiter, pathMgr, newcfg, false)
 		if (actualErr != nil) != rt.expectedErr {
 			t.Errorf(
-				"failed UpgradeStaticPodControlPlane\n\texpected error: %t\n\tgot: %t",
+				"failed UpgradeStaticPodControlPlane\n\texpected error: %t\n\tgot: %t\n\tactual error: %v",
 				rt.expectedErr,
 				(actualErr != nil),
+				actualErr,
 			)
 		}
 
@@ -365,10 +396,10 @@ func getAPIServerHash(dir string) (string, error) {
 	return fmt.Sprintf("%x", sha256.Sum256(fileBytes)), nil
 }
 
-func getConfig(version string) (*kubeadmapi.MasterConfiguration, error) {
+func getConfig(version string, certsDir string) (*kubeadmapi.MasterConfiguration, error) {
 	externalcfg := &kubeadmapiext.MasterConfiguration{}
 	internalcfg := &kubeadmapi.MasterConfiguration{}
-	if err := runtime.DecodeInto(legacyscheme.Codecs.UniversalDecoder(), []byte(fmt.Sprintf(testConfiguration, version)), externalcfg); err != nil {
+	if err := runtime.DecodeInto(legacyscheme.Codecs.UniversalDecoder(), []byte(fmt.Sprintf(testConfiguration, certsDir, version)), externalcfg); err != nil {
 		return nil, fmt.Errorf("unable to decode config: %v", err)
 	}
 	legacyscheme.Scheme.Convert(externalcfg, internalcfg, nil)

docs/.generated_docs

@@ -20,9 +20,12 @@ docs/admin/kubeadm_alpha_phase_bootstrap-token_node_allow-auto-approve.md
 docs/admin/kubeadm_alpha_phase_bootstrap-token_node_allow-post-csrs.md
 docs/admin/kubeadm_alpha_phase_certs.md
 docs/admin/kubeadm_alpha_phase_certs_all.md
+docs/admin/kubeadm_alpha_phase_certs_apiserver-etcd-client.md
 docs/admin/kubeadm_alpha_phase_certs_apiserver-kubelet-client.md
 docs/admin/kubeadm_alpha_phase_certs_apiserver.md
 docs/admin/kubeadm_alpha_phase_certs_ca.md
+docs/admin/kubeadm_alpha_phase_certs_etcd-peer.md
+docs/admin/kubeadm_alpha_phase_certs_etcd-server.md
 docs/admin/kubeadm_alpha_phase_certs_front-proxy-ca.md
 docs/admin/kubeadm_alpha_phase_certs_front-proxy-client.md
 docs/admin/kubeadm_alpha_phase_certs_sa.md
@@ -83,9 +86,12 @@ docs/man/man1/kubeadm-alpha-phase-bootstrap-token-node-allow-post-csrs.1
 docs/man/man1/kubeadm-alpha-phase-bootstrap-token-node.1
 docs/man/man1/kubeadm-alpha-phase-bootstrap-token.1
 docs/man/man1/kubeadm-alpha-phase-certs-all.1
+docs/man/man1/kubeadm-alpha-phase-certs-apiserver-etcd-client.1
 docs/man/man1/kubeadm-alpha-phase-certs-apiserver-kubelet-client.1
 docs/man/man1/kubeadm-alpha-phase-certs-apiserver.1
 docs/man/man1/kubeadm-alpha-phase-certs-ca.1
+docs/man/man1/kubeadm-alpha-phase-certs-etcd-peer.1
+docs/man/man1/kubeadm-alpha-phase-certs-etcd-server.1
 docs/man/man1/kubeadm-alpha-phase-certs-front-proxy-ca.1
 docs/man/man1/kubeadm-alpha-phase-certs-front-proxy-client.1
 docs/man/man1/kubeadm-alpha-phase-certs-sa.1

docs/admin/kubeadm_alpha_phase_certs_apiserver-etcd-client.md

@@ -0,0 +1,3 @@
+This file is autogenerated, but we've stopped checking such files into the
+repository to reduce the need for rebases. Please run hack/generate-docs.sh to
+populate this file.

docs/admin/kubeadm_alpha_phase_certs_etcd-peer.md

@@ -0,0 +1,3 @@
+This file is autogenerated, but we've stopped checking such files into the
+repository to reduce the need for rebases. Please run hack/generate-docs.sh to
+populate this file.

docs/admin/kubeadm_alpha_phase_certs_etcd-server.md

@@ -0,0 +1,3 @@
+This file is autogenerated, but we've stopped checking such files into the
+repository to reduce the need for rebases. Please run hack/generate-docs.sh to
+populate this file.

docs/man/man1/kubeadm-alpha-phase-certs-apiserver-etcd-client.1

@@ -0,0 +1,3 @@
+This file is autogenerated, but we've stopped checking such files into the
+repository to reduce the need for rebases. Please run hack/generate-docs.sh to
+populate this file.

docs/man/man1/kubeadm-alpha-phase-certs-etcd-peer.1

@@ -0,0 +1,3 @@
+This file is autogenerated, but we've stopped checking such files into the
+repository to reduce the need for rebases. Please run hack/generate-docs.sh to
+populate this file.

docs/man/man1/kubeadm-alpha-phase-certs-etcd-server.1

@@ -0,0 +1,3 @@
+This file is autogenerated, but we've stopped checking such files into the
+repository to reduce the need for rebases. Please run hack/generate-docs.sh to
+populate this file.