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Configure the Kubelet to listen on HTTPS. If no certificates are

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provided on the command line, generate self-signed certs.
This commit is contained in:
Robert Bailey 2015-03-30 16:51:17 -07:00
parent fb1a8219d4
commit d0f48b68d8
1 changed files with 29 additions and 0 deletions
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29
cmd/kubelet/app/server.go
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@ -18,6 +18,7 @@ limitations under the License.
package app
import (
"crypto/tls"
"fmt"
"math/rand"
"net"
@ -88,6 +89,8 @@ type KubeletServer struct {
NetworkPluginName string
CloudProvider string
CloudConfigFile string
TLSCertFile string
TLSPrivateKeyFile string
}
// NewKubeletServer will create a new KubeletServer with default values.
@ -128,6 +131,11 @@ func (s *KubeletServer) AddFlags(fs *pflag.FlagSet) {
fs.BoolVar(&s.EnableServer, "enable_server", s.EnableServer, "Enable the info server")
fs.Var(&s.Address, "address", "The IP address for the info server to serve on (set to 0.0.0.0 for all interfaces)")
fs.UintVar(&s.Port, "port", s.Port, "The port for the info server to serve on")
fs.StringVar(&s.TLSCertFile, "tls_cert_file", s.TLSCertFile, ""+
"File containing x509 Certificate for HTTPS. (CA cert, if any, concatenated after server cert). "+
"If --tls_cert_file and --tls_private_key_file are not provided, a self-signed certificate and key "+
"are generated for the public address and saved to /var/run/kubernetes.")
fs.StringVar(&s.TLSPrivateKeyFile, "tls_private_key_file", s.TLSPrivateKeyFile, "File containing x509 private key matching --tls_cert_file.")
fs.StringVar(&s.HostnameOverride, "hostname_override", s.HostnameOverride, "If non-empty, will use this string as identification instead of the actual hostname.")
fs.StringVar(&s.PodInfraContainerImage, "pod_infra_container_image", s.PodInfraContainerImage, "The image whose network/ipc namespaces containers in each pod will use.")
fs.StringVar(&s.DockerEndpoint, "docker_endpoint", s.DockerEndpoint, "If non-empty, use this for the docker endpoint to communicate with")
@ -194,6 +202,26 @@ func (s *KubeletServer) Run(_ []string) error {
if err != nil {
return err
}
if s.TLSCertFile == "" && s.TLSPrivateKeyFile == "" {
s.TLSCertFile = "/var/run/kubernetes/kubelet.crt"
s.TLSPrivateKeyFile = "/var/run/kubernetes/kubelet.key"
if err := util.GenerateSelfSignedCert(util.GetHostname(s.HostnameOverride), s.TLSCertFile, s.TLSPrivateKeyFile); err != nil {
glog.Fatalf("Unable to generate self signed cert: %v", err)
}
glog.Infof("Using self-signed cert (%s, %s)", s.TLSCertFile, s.TLSPrivateKeyFile)
}
tlsOptions := &kubelet.TLSOptions{
Config: &tls.Config{
// Change default from SSLv3 to TLSv1.0 (because of POODLE vulnerability).
MinVersion: tls.VersionTLS10,
// Populate PeerCertificates in requests, but don't yet reject connections without certificates.
ClientAuth: tls.RequestClientCert,
},
CertFile: s.TLSCertFile,
KeyFile: s.TLSPrivateKeyFile,
}
kcfg := KubeletConfig{
Address: s.Address,
AllowPrivileged: s.AllowPrivileged,
@ -225,6 +253,7 @@ func (s *KubeletServer) Run(_ []string) error {
NetworkPlugins: ProbeNetworkPlugins(),
NetworkPluginName: s.NetworkPluginName,
StreamingConnectionIdleTimeout: s.StreamingConnectionIdleTimeout,
TLSOptions: tlsOptions,
ImageGCPolicy: imageGCPolicy,
Cloud: cloud,
}