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etcd.go
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etcd.go
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/*
Copyright 2022 k0s authors
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package controller
import (
"context"
"fmt"
"os"
"path/filepath"
"runtime"
"strings"
"time"
"github.com/sirupsen/logrus"
"golang.org/x/sync/errgroup"
"github.com/k0sproject/k0s/internal/pkg/dir"
"github.com/k0sproject/k0s/internal/pkg/file"
"github.com/k0sproject/k0s/internal/pkg/stringmap"
"github.com/k0sproject/k0s/internal/pkg/users"
"github.com/k0sproject/k0s/pkg/apis/k0s.k0sproject.io/v1beta1"
"github.com/k0sproject/k0s/pkg/assets"
"github.com/k0sproject/k0s/pkg/certificate"
"github.com/k0sproject/k0s/pkg/component"
"github.com/k0sproject/k0s/pkg/constant"
"github.com/k0sproject/k0s/pkg/etcd"
"github.com/k0sproject/k0s/pkg/supervisor"
"github.com/k0sproject/k0s/pkg/token"
)
// Etcd implement the component interface to run etcd
type Etcd struct {
CertManager certificate.Manager
Config *v1beta1.EtcdConfig
JoinClient *token.JoinClient
K0sVars constant.CfgVars
LogLevel string
supervisor supervisor.Supervisor
uid int
gid int
ctx context.Context
}
var _ component.Component = (*Etcd)(nil)
// Init extracts the needed binaries
func (e *Etcd) Init(_ context.Context) error {
var err error
if err = detectUnsupportedEtcdArch(); err != nil {
logrus.Error(fmt.Errorf("missing environment variable: %w", err))
return err
}
e.uid, err = users.GetUID(constant.EtcdUser)
if err != nil {
logrus.Warning(fmt.Errorf("running etcd as root: %w", err))
}
err = dir.Init(e.K0sVars.EtcdDataDir, constant.EtcdDataDirMode) // https://docs.datadoghq.com/security_monitoring/default_rules/cis-kubernetes-1.5.1-1.1.11/
if err != nil {
return fmt.Errorf("failed to create %s: %w", e.K0sVars.EtcdDataDir, err)
}
err = dir.Init(e.K0sVars.EtcdCertDir, constant.EtcdCertDirMode) // https://docs.datadoghq.com/security_monitoring/default_rules/cis-kubernetes-1.5.1-4.1.7/
if err != nil {
return fmt.Errorf("failed to create etcd cert dir: %w", err)
}
for _, f := range []string{e.K0sVars.EtcdDataDir, e.K0sVars.EtcdCertDir} {
err = chown(f, e.uid, e.gid)
if err != nil && os.Geteuid() == 0 {
return err
}
}
return assets.Stage(e.K0sVars.BinDir, "etcd", constant.BinDirMode)
}
func (e *Etcd) syncEtcdConfig(peerURL, etcdCaCert, etcdCaCertKey string) ([]string, error) {
var etcdResponse v1beta1.EtcdResponse
var err error
for i := 0; i < 20; i++ {
logrus.Debugf("trying to sync etcd config")
etcdResponse, err = e.JoinClient.JoinEtcd(peerURL)
if err == nil {
break
}
time.Sleep(500 * time.Millisecond)
}
if err != nil {
return nil, err
}
logrus.Debugf("got cluster info: %v", etcdResponse.InitialCluster)
// Write etcd ca cert&key
if file.Exists(etcdCaCert) && file.Exists(etcdCaCertKey) {
logrus.Warnf("etcd ca certs already exists, not gonna overwrite. If you wish to re-sync them, delete the existing ones.")
} else {
err = os.WriteFile(etcdCaCertKey, etcdResponse.CA.Key, constant.CertSecureMode)
if err != nil {
return nil, err
}
err = os.WriteFile(etcdCaCert, etcdResponse.CA.Cert, constant.CertSecureMode)
if err != nil {
return nil, err
}
for _, f := range []string{filepath.Dir(etcdCaCertKey), etcdCaCertKey, etcdCaCert} {
if err := os.Chown(f, e.uid, e.gid); err != nil && os.Geteuid() == 0 {
return nil, err
}
}
}
return etcdResponse.InitialCluster, nil
}
// Run runs etcd if external cluster is not configured
func (e *Etcd) Run(ctx context.Context) error {
e.ctx = ctx
if e.Config.IsExternalClusterUsed() {
return nil
}
etcdCaCert := filepath.Join(e.K0sVars.EtcdCertDir, "ca.crt")
etcdCaCertKey := filepath.Join(e.K0sVars.EtcdCertDir, "ca.key")
etcdServerCert := filepath.Join(e.K0sVars.EtcdCertDir, "server.crt")
etcdServerKey := filepath.Join(e.K0sVars.EtcdCertDir, "server.key")
etcdPeerCert := filepath.Join(e.K0sVars.EtcdCertDir, "peer.crt")
etcdPeerKey := filepath.Join(e.K0sVars.EtcdCertDir, "peer.key")
etcdSignKey := filepath.Join(e.K0sVars.EtcdCertDir, "jwt.key")
etcdSignPub := filepath.Join(e.K0sVars.EtcdCertDir, "jwt.pub")
logrus.Info("Starting etcd")
name, err := os.Hostname()
if err != nil {
return err
}
peerURL := fmt.Sprintf("https://%s:2380", e.Config.PeerAddress)
args := stringmap.StringMap{
"--data-dir": e.K0sVars.EtcdDataDir,
"--listen-client-urls": "https://127.0.0.1:2379",
"--advertise-client-urls": "https://127.0.0.1:2379",
"--client-cert-auth": "true",
"--listen-peer-urls": peerURL,
"--initial-advertise-peer-urls": peerURL,
"--name": name,
"--trusted-ca-file": etcdCaCert,
"--cert-file": etcdServerCert,
"--key-file": etcdServerKey,
"--peer-trusted-ca-file": etcdCaCert,
"--peer-key-file": etcdPeerKey,
"--peer-cert-file": etcdPeerCert,
"--log-level": e.LogLevel,
"--peer-client-cert-auth": "true",
"--enable-pprof": "false",
}
if file.Exists(filepath.Join(e.K0sVars.EtcdDataDir, "member", "snap", "db")) {
logrus.Warnf("etcd db file(s) already exist, not gonna run join process")
} else if e.JoinClient != nil {
initialCluster, err := e.syncEtcdConfig(peerURL, etcdCaCert, etcdCaCertKey)
if err != nil {
return fmt.Errorf("failed to sync etcd config: %w", err)
}
args["--initial-cluster"] = strings.Join(initialCluster, ",")
args["--initial-cluster-state"] = "existing"
}
if err := e.setupCerts(ctx); err != nil {
return fmt.Errorf("failed to create etcd certs: %w", err)
}
// In case this is upgrade/restart, the sign key is not created
if file.Exists(etcdSignKey) && file.Exists(etcdSignPub) {
auth := fmt.Sprintf("jwt,pub-key=%s,priv-key=%s,sign-method=RS512,ttl=10m", etcdSignPub, etcdSignKey)
args["--auth-token"] = auth
}
logrus.Debugf("starting etcd with args: %v", args)
e.supervisor = supervisor.Supervisor{
Name: "etcd",
BinPath: assets.BinPath("etcd", e.K0sVars.BinDir),
RunDir: e.K0sVars.RunDir,
DataDir: e.K0sVars.DataDir,
Args: args.ToArgs(),
UID: e.uid,
GID: e.gid,
KeepEnvPrefix: true,
}
return e.supervisor.Supervise()
}
// Stop stops etcd
func (e *Etcd) Stop() error {
return e.supervisor.Stop()
}
func (e *Etcd) setupCerts(ctx context.Context) error {
etcdCaCert := filepath.Join(e.K0sVars.EtcdCertDir, "ca.crt")
etcdCaCertKey := filepath.Join(e.K0sVars.EtcdCertDir, "ca.key")
if err := e.CertManager.EnsureCA("etcd/ca", "etcd-ca"); err != nil {
return fmt.Errorf("failed to create etcd ca: %w", err)
}
eg, _ := errgroup.WithContext(ctx)
eg.Go(func() error {
// etcd client cert
etcdCertReq := certificate.Request{
Name: "apiserver-etcd-client",
CN: "apiserver-etcd-client",
O: "apiserver-etcd-client",
CACert: etcdCaCert,
CAKey: etcdCaCertKey,
Hostnames: []string{
"127.0.0.1",
"localhost",
},
}
_, err := e.CertManager.EnsureCertificate(etcdCertReq, constant.ApiserverUser)
return err
})
eg.Go(func() error {
// etcd server cert
etcdCertReq := certificate.Request{
Name: filepath.Join("etcd", "server"),
CN: "etcd-server",
O: "etcd-server",
CACert: etcdCaCert,
CAKey: etcdCaCertKey,
Hostnames: []string{
"127.0.0.1",
"localhost",
},
}
_, err := e.CertManager.EnsureCertificate(etcdCertReq, constant.EtcdUser)
return err
})
eg.Go(func() error {
etcdPeerCertReq := certificate.Request{
Name: filepath.Join("etcd", "peer"),
CN: e.Config.PeerAddress,
O: "etcd-peer",
CACert: etcdCaCert,
CAKey: etcdCaCertKey,
Hostnames: []string{
e.Config.PeerAddress,
},
}
_, err := e.CertManager.EnsureCertificate(etcdPeerCertReq, constant.EtcdUser)
return err
})
eg.Go(func() error {
return e.CertManager.CreateKeyPair("etcd/jwt", e.K0sVars, constant.EtcdUser)
})
return eg.Wait()
}
// Health-check interface
func (e *Etcd) Healthy() error {
logrus.WithField("component", "etcd").Debug("checking etcd endpoint for health")
ctx, cancel := context.WithTimeout(e.ctx, 1*time.Second)
defer cancel()
err := etcd.CheckEtcdReady(ctx, e.K0sVars.CertRootDir, e.K0sVars.EtcdCertDir, e.Config)
return err
}
func detectUnsupportedEtcdArch() error {
// https://github.com/etcd-io/etcd/blob/v3.5.2/server/etcdmain/etcd.go#L467-L472
if runtime.GOARCH != "amd64" && runtime.GOARCH != "arm64" {
if os.Getenv("ETCD_UNSUPPORTED_ARCH") != runtime.GOARCH {
return fmt.Errorf("running ETCD on %s requires ETCD_UNSUPPORTED_ARCH=%s ", runtime.GOARCH, runtime.GOARCH)
}
}
return nil
}
// for the patch release purpose the solution is in-place to be as least intrusive as possible
func chown(name string, uid int, gid int) error {
if uid == 0 {
return nil
}
if dir.IsDirectory(name) {
if err := filepath.Walk(name, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
return os.Chown(path, uid, gid)
}); err != nil {
return fmt.Errorf("can't chmod file `%s`: %w", name, err)
}
return nil
}
return os.Chown(name, uid, gid)
}