forked from coreos/etcd-operator
/
backup.go
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/
backup.go
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// Copyright 2016 The etcd-operator 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 backup
import (
"crypto/tls"
"fmt"
"log"
"os"
"path"
"time"
api "github.com/coreos/etcd-operator/pkg/apis/etcd/v1beta2"
"github.com/coreos/etcd-operator/pkg/backup/abs"
"github.com/coreos/etcd-operator/pkg/backup/backupapi"
"github.com/coreos/etcd-operator/pkg/backup/env"
"github.com/coreos/etcd-operator/pkg/backup/s3"
"github.com/coreos/etcd-operator/pkg/util/constants"
"github.com/coreos/etcd-operator/pkg/util/etcdutil"
"github.com/coreos/etcd-operator/pkg/util/k8sutil"
"github.com/Sirupsen/logrus"
"github.com/coreos/etcd/clientv3"
"golang.org/x/net/context"
"k8s.io/api/core/v1"
"k8s.io/client-go/kubernetes"
)
const (
PVBackupV1 = "v1"
maxRecentBackupStatusCount = 10
)
type Backup struct {
kclient kubernetes.Interface
clusterName string
namespace string
policy api.BackupPolicy
listenAddr string
etcdTLSConfig *tls.Config
selfHosted bool
be backend
backupNow chan chan backupNowAck
// recentBackupStatus keeps the statuses of 'maxRecentBackupStatusCount' recent backups.
recentBackupsStatus []backupapi.BackupStatus
}
func New(kclient kubernetes.Interface, clusterName, ns string, sp api.ClusterSpec, listenAddr string) (*Backup, error) {
bdir := path.Join(constants.BackupMountDir, PVBackupV1, clusterName)
// We created not only backup dir and but also tmp dir under it.
// tmp dir is used to store intermediate snapshot files.
// It will be no-op if target dir existed.
tmpDir := path.Join(bdir, backupTmpDir)
err := os.MkdirAll(tmpDir, 0700)
if err != nil {
return nil, err
}
var be backend
switch sp.Backup.StorageType {
case api.BackupStorageTypePersistentVolume, api.BackupStorageTypeDefault:
be = &fileBackend{dir: bdir}
case api.BackupStorageTypeS3:
s3Prefix := ""
if sp.Backup.S3 != nil {
s3Prefix = sp.Backup.S3.Prefix
}
s3cli, err := s3.New(os.Getenv(env.AWSS3Bucket), backupapi.ToS3Prefix(s3Prefix, ns, clusterName))
if err != nil {
return nil, err
}
be = &s3Backend{
dir: tmpDir,
S3: s3cli,
}
case api.BackupStorageTypeABS:
absCli, err := abs.New(os.Getenv(env.ABSContainer),
os.Getenv(env.ABSStorageAccount),
os.Getenv(env.ABSStorageKey),
path.Join(ns, clusterName))
if err != nil {
return nil, err
}
be = &absBackend{
ABS: absCli,
}
default:
return nil, fmt.Errorf("unsupported storage type: %v", sp.Backup.StorageType)
}
var tc *tls.Config
if sp.TLS.IsSecureClient() {
d, err := k8sutil.GetTLSDataFromSecret(kclient, ns, sp.TLS.Static.OperatorSecret)
if err != nil {
return nil, err
}
tc, err = etcdutil.NewTLSConfig(d.CertData, d.KeyData, d.CAData)
if err != nil {
return nil, err
}
}
return &Backup{
kclient: kclient,
clusterName: clusterName,
namespace: ns,
policy: *sp.Backup,
listenAddr: listenAddr,
be: be,
etcdTLSConfig: tc,
selfHosted: sp.SelfHosted != nil,
backupNow: make(chan chan backupNowAck),
}, nil
}
func (b *Backup) Run() {
go b.startHTTP()
lastSnapRev := b.getLatestBackupRev()
interval := constants.DefaultSnapshotInterval
if b.policy.BackupIntervalInSecond != 0 {
interval = time.Duration(b.policy.BackupIntervalInSecond) * time.Second
}
go func() {
if b.policy.MaxBackups == 0 {
return
}
for {
<-time.After(10 * time.Second)
err := b.be.purge(b.policy.MaxBackups)
if err != nil {
logrus.Errorf("fail to purge backups: %v", err)
}
}
}()
for {
var ackchan chan backupNowAck
select {
case <-time.After(interval):
case ackchan = <-b.backupNow:
logrus.Info("received a backup request")
}
rev, err := b.saveSnap(lastSnapRev)
if err != nil {
logrus.Errorf("failed to save snapshot: %v", err)
}
lastSnapRev = rev
if ackchan != nil {
ack := backupNowAck{err: err}
if err == nil {
ack.status = b.getLatestBackupStatus()
}
ackchan <- ack
}
}
}
func (b *Backup) saveSnap(lastSnapRev int64) (int64, error) {
podList, err := b.kclient.Core().Pods(b.namespace).List(k8sutil.ClusterListOpt(b.clusterName))
if err != nil {
return lastSnapRev, err
}
var pods []*v1.Pod
for i := range podList.Items {
pod := &podList.Items[i]
if pod.Status.Phase == v1.PodRunning {
pods = append(pods, pod)
}
}
if len(pods) == 0 {
msg := "no running etcd pods found"
logrus.Warning(msg)
return lastSnapRev, fmt.Errorf(msg)
}
member, rev := getMemberWithMaxRev(pods, b.etcdTLSConfig, b.selfHosted)
if member == nil {
logrus.Warning("no reachable member")
return lastSnapRev, fmt.Errorf("no reachable member")
}
if rev <= lastSnapRev {
logrus.Info("skipped creating new backup: no change since last time")
return lastSnapRev, nil
}
log.Printf("saving backup for cluster (%s)", b.clusterName)
if err := b.writeSnap(member, rev); err != nil {
err = fmt.Errorf("write snapshot failed: %v", err)
return lastSnapRev, err
}
return rev, nil
}
func (b *Backup) writeSnap(m *etcdutil.Member, rev int64) error {
start := time.Now()
cfg := clientv3.Config{
Endpoints: []string{m.ClientURL()},
DialTimeout: constants.DefaultDialTimeout,
TLS: b.etcdTLSConfig,
}
etcdcli, err := clientv3.New(cfg)
if err != nil {
return fmt.Errorf("failed to create etcd client (%v)", err)
}
defer etcdcli.Close()
ctx, cancel := context.WithTimeout(context.Background(), constants.DefaultRequestTimeout)
resp, err := etcdcli.Maintenance.Status(ctx, m.ClientURL())
cancel()
if err != nil {
return err
}
ctx, cancel = context.WithTimeout(context.Background(), constants.DefaultSnapshotTimeout)
rc, err := etcdcli.Maintenance.Snapshot(ctx)
if err != nil {
return fmt.Errorf("failed to receive snapshot (%v)", err)
}
defer cancel()
defer rc.Close()
n, err := b.be.save(resp.Version, rev, rc)
if err != nil {
return err
}
bs := backupapi.BackupStatus{
CreationTime: time.Now().Format(time.RFC3339),
Size: toMB(n),
Version: resp.Version,
Revision: rev,
TimeTookInSecond: int(time.Since(start).Seconds() + 1),
}
b.recentBackupsStatus = append(b.recentBackupsStatus, bs)
if len(b.recentBackupsStatus) > maxRecentBackupStatusCount {
b.recentBackupsStatus = b.recentBackupsStatus[1:]
}
return nil
}
func getMemberWithMaxRev(pods []*v1.Pod, tc *tls.Config, selfHosted bool) (*etcdutil.Member, int64) {
var member *etcdutil.Member
maxRev := int64(0)
for _, pod := range pods {
m := &etcdutil.Member{
Name: pod.Name,
Namespace: pod.Namespace,
SecureClient: tc != nil,
}
cfg := clientv3.Config{
Endpoints: []string{m.ClientURL()},
DialTimeout: constants.DefaultDialTimeout,
TLS: tc,
}
etcdcli, err := clientv3.New(cfg)
if err != nil {
logrus.Warningf("failed to create etcd client for pod (%v): %v", pod.Name, err)
continue
}
defer etcdcli.Close()
ctx, cancel := context.WithTimeout(context.Background(), constants.DefaultRequestTimeout)
resp, err := etcdcli.Get(ctx, "/", clientv3.WithSerializable())
cancel()
if err != nil {
logrus.Warningf("getMaxRev: failed to get revision from member %s (%s)", m.Name, m.ClientURL())
continue
}
logrus.Infof("getMaxRev: member %s revision (%d)", m.Name, resp.Header.Revision)
if resp.Header.Revision > maxRev {
maxRev = resp.Header.Revision
member = m
}
}
return member, maxRev
}
func (b *Backup) getLatestBackupRev() int64 {
// If there is any error, we just exit backup sidecar because we can't serve the backup any way.
name, err := b.be.getLatest()
if err != nil {
logrus.Fatal(err)
}
if len(name) == 0 {
return 0
}
rev, err := getRev(name)
if err != nil {
logrus.Fatal(err)
}
return rev
}
func (b *Backup) getLatestBackupStatus() backupapi.BackupStatus {
return b.recentBackupsStatus[len(b.recentBackupsStatus)-1]
}