forked from etcd-io/etcd
/
snapshot_command.go
173 lines (151 loc) · 5.05 KB
/
snapshot_command.go
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// Copyright 2016 The etcd 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 command
import (
"context"
"fmt"
"path/filepath"
"strings"
"github.com/coreos/etcd/snapshot"
"github.com/spf13/cobra"
"go.uber.org/zap"
)
const (
defaultName = "default"
defaultInitialAdvertisePeerURLs = "http://localhost:2380"
)
var (
restoreCluster string
restoreClusterToken string
restoreDataDir string
restoreWalDir string
restorePeerURLs string
restoreName string
skipHashCheck bool
)
// NewSnapshotCommand returns the cobra command for "snapshot".
func NewSnapshotCommand() *cobra.Command {
cmd := &cobra.Command{
Use: "snapshot <subcommand>",
Short: "Manages etcd node snapshots",
}
cmd.AddCommand(NewSnapshotSaveCommand())
cmd.AddCommand(NewSnapshotRestoreCommand())
cmd.AddCommand(newSnapshotStatusCommand())
return cmd
}
func NewSnapshotSaveCommand() *cobra.Command {
return &cobra.Command{
Use: "save <filename>",
Short: "Stores an etcd node backend snapshot to a given file",
Run: snapshotSaveCommandFunc,
}
}
func newSnapshotStatusCommand() *cobra.Command {
return &cobra.Command{
Use: "status <filename>",
Short: "Gets backend snapshot status of a given file",
Long: `When --write-out is set to simple, this command prints out comma-separated status lists for each endpoint.
The items in the lists are hash, revision, total keys, total size.
`,
Run: snapshotStatusCommandFunc,
}
}
func NewSnapshotRestoreCommand() *cobra.Command {
cmd := &cobra.Command{
Use: "restore <filename> [options]",
Short: "Restores an etcd member snapshot to an etcd directory",
Run: snapshotRestoreCommandFunc,
}
cmd.Flags().StringVar(&restoreDataDir, "data-dir", "", "Path to the data directory")
cmd.Flags().StringVar(&restoreWalDir, "wal-dir", "", "Path to the WAL directory (use --data-dir if none given)")
cmd.Flags().StringVar(&restoreCluster, "initial-cluster", initialClusterFromName(defaultName), "Initial cluster configuration for restore bootstrap")
cmd.Flags().StringVar(&restoreClusterToken, "initial-cluster-token", "etcd-cluster", "Initial cluster token for the etcd cluster during restore bootstrap")
cmd.Flags().StringVar(&restorePeerURLs, "initial-advertise-peer-urls", defaultInitialAdvertisePeerURLs, "List of this member's peer URLs to advertise to the rest of the cluster")
cmd.Flags().StringVar(&restoreName, "name", defaultName, "Human-readable name for this member")
cmd.Flags().BoolVar(&skipHashCheck, "skip-hash-check", false, "Ignore snapshot integrity hash value (required if copied from data directory)")
return cmd
}
func snapshotSaveCommandFunc(cmd *cobra.Command, args []string) {
if len(args) != 1 {
err := fmt.Errorf("snapshot save expects one argument")
ExitWithError(ExitBadArgs, err)
}
lg, err := zap.NewProduction()
if err != nil {
ExitWithError(ExitError, err)
}
sp := snapshot.NewV3(lg)
cfg := mustClientCfgFromCmd(cmd)
path := args[0]
if err := sp.Save(context.TODO(), *cfg, path); err != nil {
ExitWithError(ExitInterrupted, err)
}
fmt.Printf("Snapshot saved at %s\n", path)
}
func snapshotStatusCommandFunc(cmd *cobra.Command, args []string) {
if len(args) != 1 {
err := fmt.Errorf("snapshot status requires exactly one argument")
ExitWithError(ExitBadArgs, err)
}
initDisplayFromCmd(cmd)
lg, err := zap.NewProduction()
if err != nil {
ExitWithError(ExitError, err)
}
sp := snapshot.NewV3(lg)
ds, err := sp.Status(args[0])
if err != nil {
ExitWithError(ExitError, err)
}
display.DBStatus(ds)
}
func snapshotRestoreCommandFunc(cmd *cobra.Command, args []string) {
if len(args) != 1 {
err := fmt.Errorf("snapshot restore requires exactly one argument")
ExitWithError(ExitBadArgs, err)
}
dataDir := restoreDataDir
if dataDir == "" {
dataDir = restoreName + ".etcd"
}
walDir := restoreWalDir
if walDir == "" {
walDir = filepath.Join(dataDir, "member", "wal")
}
lg, err := zap.NewProduction()
if err != nil {
ExitWithError(ExitError, err)
}
sp := snapshot.NewV3(lg)
if err := sp.Restore(snapshot.RestoreConfig{
SnapshotPath: args[0],
Name: restoreName,
OutputDataDir: dataDir,
OutputWALDir: walDir,
PeerURLs: strings.Split(restorePeerURLs, ","),
InitialCluster: restoreCluster,
InitialClusterToken: restoreClusterToken,
SkipHashCheck: skipHashCheck,
}); err != nil {
ExitWithError(ExitError, err)
}
}
func initialClusterFromName(name string) string {
n := name
if name == "" {
n = defaultName
}
return fmt.Sprintf("%s=http://localhost:2380", n)
}