Merge pull request #41877 from bruceauyeung/k8s-branch-preflight-check-etcd-version

Automatic merge from submit-queue (batch tested with PRs 41954, 40528, 41875, 41165, 41877)

preflight check external etcd version when kubeadm init

**What this PR does / why we need it**:
1. preflight check if verson of external etcd server meets the demand of kubeadm, currently requires >= 3.0.14
2. support mixed http endpoints and https endpoints

**Which issue this PR fixes** : fixes  https://github.com/kubernetes/kubeadm/issues/174

**Special notes for your reviewer**:
i have tested against single endpoint including http etcd server , https etcd server,  but multiple endpoints not tested yet. i'll do it tomorrow
This commit is contained in:
Kubernetes Submit Queue 2017-02-26 14:54:55 -08:00 committed by GitHub
commit e4c545a839
4 changed files with 379 additions and 2 deletions

View File

@ -94,6 +94,9 @@ const (
CSVTokenBootstrapGroup = "kubeadm:kubelet-bootstrap"
// The file name of the tokens file that can be used for bootstrapping
CSVTokenFileName = "tokens.csv"
// MinExternalEtcdVersion indicates minimum external etcd version which kubeadm supports
MinExternalEtcdVersion = "3.0.14"
)
var (

View File

@ -20,6 +20,8 @@ go_library(
"//pkg/util/initsystem:go_default_library",
"//pkg/util/node:go_default_library",
"//test/e2e_node/system:go_default_library",
"//vendor:github.com/PuerkitoBio/purell",
"//vendor:github.com/blang/semver",
"//vendor:k8s.io/apimachinery/pkg/util/errors",
],
)
@ -29,7 +31,10 @@ go_test(
srcs = ["checks_test.go"],
library = ":go_default_library",
tags = ["automanaged"],
deps = ["//cmd/kubeadm/app/apis/kubeadm:go_default_library"],
deps = [
"//cmd/kubeadm/app/apis/kubeadm:go_default_library",
"//vendor:github.com/renstrom/dedent",
],
)
filegroup(

View File

@ -19,13 +19,24 @@ package preflight
import (
"bufio"
"bytes"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net"
"net/http"
"os"
"os/exec"
"path/filepath"
"time"
"crypto/tls"
"crypto/x509"
"github.com/PuerkitoBio/purell"
"github.com/blang/semver"
"net/url"
utilerrors "k8s.io/apimachinery/pkg/util/errors"
kubeadmapi "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm"
@ -37,7 +48,16 @@ import (
"k8s.io/kubernetes/test/e2e_node/system"
)
const bridgenf string = "/proc/sys/net/bridge/bridge-nf-call-iptables"
const (
bridgenf = "/proc/sys/net/bridge/bridge-nf-call-iptables"
externalEtcdRequestTimeout = time.Duration(10 * time.Second)
externalEtcdRequestRetries = 3
externalEtcdRequestInterval = time.Duration(5 * time.Second)
)
var (
minExternalEtcdVersion = semver.MustParse(kubeadmconstants.MinExternalEtcdVersion)
)
type Error struct {
Msg string
@ -326,6 +346,139 @@ func (sysver SystemVerificationCheck) Check() (warnings, errors []error) {
return nil, nil
}
type etcdVersionResponse struct {
Etcdserver string `json:"etcdserver"`
Etcdcluster string `json:"etcdcluster"`
}
// ExternalEtcdVersionCheck checks if version of external etcd meets the demand of kubeadm
type ExternalEtcdVersionCheck struct {
Etcd kubeadmapi.Etcd
}
func (evc ExternalEtcdVersionCheck) Check() (warnings, errors []error) {
var config *tls.Config
var err error
if config, err = evc.configRootCAs(config); err != nil {
errors = append(errors, err)
return nil, errors
}
if config, err = evc.configCertAndKey(config); err != nil {
errors = append(errors, err)
return nil, errors
}
client := evc.getHTTPClient(config)
for _, endpoint := range evc.Etcd.Endpoints {
if _, err := url.Parse(endpoint); err != nil {
errors = append(errors, fmt.Errorf("failed to parse external etcd endpoint %s : %v", endpoint, err))
continue
}
resp := etcdVersionResponse{}
var err error
versionURL := fmt.Sprintf("%s/%s", endpoint, "version")
if tmpVersionURL, err := purell.NormalizeURLString(versionURL, purell.FlagRemoveDuplicateSlashes); err != nil {
errors = append(errors, fmt.Errorf("failed to normalize external etcd version url %s : %v", versionURL, err))
continue
} else {
versionURL = tmpVersionURL
}
if err = getEtcdVersionResponse(client, versionURL, &resp); err != nil {
errors = append(errors, err)
continue
}
etcdVersion, err := semver.Parse(resp.Etcdserver)
if err != nil {
errors = append(errors, fmt.Errorf("couldn't parse external etcd version %q: %v", resp.Etcdserver, err))
continue
}
if etcdVersion.LT(minExternalEtcdVersion) {
errors = append(errors, fmt.Errorf("this version of kubeadm only supports external etcd version >= %s. Current version: %s", kubeadmconstants.MinExternalEtcdVersion, resp.Etcdserver))
continue
}
}
return nil, errors
}
// configRootCAs configures and returns a reference to tls.Config instance if CAFile is provided
func (evc ExternalEtcdVersionCheck) configRootCAs(config *tls.Config) (*tls.Config, error) {
var CACertPool *x509.CertPool
if evc.Etcd.CAFile != "" {
CACert, err := ioutil.ReadFile(evc.Etcd.CAFile)
if err != nil {
return nil, fmt.Errorf("couldn't load external etcd's server certificate %s: %v", evc.Etcd.CAFile, err)
}
CACertPool = x509.NewCertPool()
CACertPool.AppendCertsFromPEM(CACert)
}
if CACertPool != nil {
if config == nil {
config = &tls.Config{}
}
config.RootCAs = CACertPool
}
return config, nil
}
// configCertAndKey configures and returns a reference to tls.Config instance if CertFile and KeyFile pair is provided
func (evc ExternalEtcdVersionCheck) configCertAndKey(config *tls.Config) (*tls.Config, error) {
var cert tls.Certificate
if evc.Etcd.CertFile != "" && evc.Etcd.KeyFile != "" {
var err error
cert, err = tls.LoadX509KeyPair(evc.Etcd.CertFile, evc.Etcd.KeyFile)
if err != nil {
return nil, fmt.Errorf("couldn't load external etcd's certificate and key pair %s, %s: %v", evc.Etcd.CertFile, evc.Etcd.KeyFile, err)
}
if config == nil {
config = &tls.Config{}
}
config.Certificates = []tls.Certificate{cert}
}
return config, nil
}
func (evc ExternalEtcdVersionCheck) getHTTPClient(config *tls.Config) *http.Client {
if config != nil {
transport := &http.Transport{
TLSClientConfig: config,
}
return &http.Client{
Transport: transport,
Timeout: externalEtcdRequestTimeout,
}
}
return &http.Client{Timeout: externalEtcdRequestTimeout}
}
func getEtcdVersionResponse(client *http.Client, url string, target interface{}) error {
loopCount := externalEtcdRequestRetries + 1
var err error
var stopRetry bool
for loopCount > 0 {
if loopCount <= externalEtcdRequestRetries {
time.Sleep(externalEtcdRequestInterval)
}
stopRetry, err = func() (stopRetry bool, err error) {
r, err := client.Get(url)
if err != nil {
loopCount--
return false, nil
}
defer r.Body.Close()
if r != nil && r.StatusCode >= 500 && r.StatusCode <= 599 {
loopCount--
return false, nil
}
return true, json.NewDecoder(r.Body).Decode(target)
}()
if stopRetry {
break
}
}
return err
}
func RunInitMasterChecks(cfg *kubeadmapi.MasterConfiguration) error {
checks := []Checker{
SystemVerificationCheck{},
@ -360,6 +513,11 @@ func RunInitMasterChecks(cfg *kubeadmapi.MasterConfiguration) error {
PortOpenCheck{port: 2379},
DirAvailableCheck{Path: "/var/lib/etcd"},
)
} else {
// Only check etcd version when external endpoints are specified
checks = append(checks,
ExternalEtcdVersionCheck{Etcd: cfg.Etcd},
)
}
// Check the config for authorization mode

View File

@ -19,12 +19,146 @@ package preflight
import (
"bytes"
"fmt"
"io/ioutil"
"testing"
"github.com/renstrom/dedent"
"os"
"k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm"
kubeadmapi "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm"
)
var (
externalEtcdRootCAFileContent = dedent.Dedent(`
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
`)
externalEtcdCertFileContent = dedent.Dedent(`
-----BEGIN CERTIFICATE-----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hwR/AAABhwQKcjPGhwQKcgwwMA0GCSqGSIb3DQEBDQUAA4ICAQCikW5SNpndBxEz
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Hw/JBgKftZ1JrjbF9NF4oFUZcFUKmTgyWYnhLH0BskgwJf2u+DpugFa4U8niQf15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-----END CERTIFICATE-----
`)
externalEtcdKeyFileContent = dedent.Dedent(`
-----BEGIN RSA PRIVATE KEY-----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AQKCAgEAmr3OlDPP3CLkpiFEcJ5TmA+y3S96TRY7IqVRhvBXRKMMoOwNczF0gHBP
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eNULpq2XTvidj7jaysIW9Q52ncvN6h2Vds/Z3Ujvdne2jMq7Q/C96fKcrhgMH9ca
ADGLWtD+VkP4NgFjj7R2jabF8d9IQdJDXAgvR/kokojF0RsJuvD2hawN6lQkkj6S
fNNGMBk4sGyt7gzAn3iO4Zoy+QjtALNnZcaH6s7oIg3UKf6OwskiBB60Q5P1U3/E
RPtTxhex3jFuySNJ413JgyGkvcP+qjuzi6eyVDxkfiyNohQYGuZ8rieFX7QfQFAY
TIXptchVUTxmGKWzcpLC3AfkwFvV2IPoMk8YnDSp270D30cqWiI9puSEcxQ=
-----END RSA PRIVATE KEY-----
`)
)
type preflightCheckTest struct {
msg string
}
@ -125,3 +259,80 @@ func TestRunChecks(t *testing.T) {
}
}
}
func TestConfigRootCAs(t *testing.T) {
f, err := ioutil.TempFile(os.TempDir(), "kubeadm-external-etcd-test-cafile")
if err != nil {
t.Errorf("failed configRootCAs:\n\texpected: succeed creating temp CA file\n\tactual:%v", err)
}
defer os.Remove(f.Name())
if err := ioutil.WriteFile(f.Name(), []byte(externalEtcdRootCAFileContent), 0644); err != nil {
t.Errorf("failed configRootCAs:\n\texpected: succeed writing contents to temp CA file %s\n\tactual:%v", f.Name(), err)
}
c := ExternalEtcdVersionCheck{Etcd: kubeadmapi.Etcd{CAFile: f.Name()}}
config, err := c.configRootCAs(nil)
if err != nil {
t.Errorf(
"failed configRootCAs:\n\texpected: has no error\n\tactual:%v",
err,
)
}
if config.RootCAs == nil {
t.Errorf(
"failed configRootCAs:\n\texpected: RootCAs not equal to nil\n\tactual:%v",
config.RootCAs,
)
}
}
func TestConfigCertAndKey(t *testing.T) {
certFile, err := ioutil.TempFile(os.TempDir(), "kubeadm-external-etcd-test-certfile")
if err != nil {
t.Errorf(
"failed configCertAndKey:\n\texpected: succeed creating temp CertFile file\n\tactual:%v",
err,
)
}
defer os.Remove(certFile.Name())
if err := ioutil.WriteFile(certFile.Name(), []byte(externalEtcdCertFileContent), 0644); err != nil {
t.Errorf(
"failed configCertAndKey:\n\texpected: succeed writing contents to temp CertFile file %s\n\tactual:%v",
certFile.Name(),
err,
)
}
keyFile, err := ioutil.TempFile(os.TempDir(), "kubeadm-external-etcd-test-keyfile")
if err != nil {
t.Errorf(
"failed configCertAndKey:\n\texpected: succeed creating temp KeyFile file\n\tactual:%v",
err,
)
}
defer os.Remove(keyFile.Name())
if err := ioutil.WriteFile(keyFile.Name(), []byte(externalEtcdKeyFileContent), 0644); err != nil {
t.Errorf(
"failed configCertAndKey:\n\texpected: succeed writing contents to temp KeyFile file %s\n\tactual:%v",
keyFile.Name(),
err,
)
}
c := ExternalEtcdVersionCheck{Etcd: kubeadmapi.Etcd{
CertFile: certFile.Name(),
KeyFile: keyFile.Name(),
}}
config, err := c.configCertAndKey(nil)
if err != nil {
t.Errorf(
"failed configCertAndKey:\n\texpected: has no error\n\tactual:%v",
err,
)
}
if config.Certificates == nil {
t.Errorf(
"failed configCertAndKey:\n\texpected: Certificates not equal to nil\n\tactual:%v",
config.Certificates,
)
}
}