3. ETCD数据备份与恢复

首先为运行在https://127.0.0.1:2379 上的现有etcd实例创建快照并将快照保存到
/srv/data/etcd-snapshot.db。

注：为给定实例创建快照预计能在几秒钟内完成。如果该操作似乎挂起，则命令可能有问题。用
ctrl+c 来取消操作，然后重试。

然后还原位于/srv/data/etcd-snapshot-previous.db的现有先前快照。

提供了TLS 证书和密钥，以通过etcdctl 连接到服务器。
CA 证书：/opt/KUIN00601/ca.crt
客户端证书: /opt/KUIN00601/etcd-client.crt
客户端密钥:/opt/KUIN00601/etcd-client.key

官方参考地址：https://kubernetes.io/zh-cn/docs/tasks/administer-cluster/configure-upgrade-etcd/

# 参考:https://www.cnblogs.com/yangmeichong/p/17957126
# 1.etcd备份
ETCDCTL_API=3 etcdctl --endpoints=https://127.0.0.1:2379 --cacert=/opt/KUIN00601/ca.crt --cert=/opt/KUIN00601/etcd-client.crt --key=/opt/KUIN00601/etcd-client.key snapshot save /srv/data/etcd-snapshot.db

# 验证备份的快照
ETCDCTL_API=3 etcdctl --write-out=table snapshot status /srv/data/etcd-snapshot.db

# 2.etcd备份恢复
etcdctl --endpoints=https://127.0.0.1:2379 --cacert=/opt/KUIN00601/ca.crt --cert=/opt/KUIN00601/etcd-client.crt --key=/opt/KUIN00601/etcd-client.key snapshot restore /srv/data/etcd-snapshot-previous.db

正式服:

# 1.备份
[root@master2 etcd]# ETCDCTL_API=3 etcdctl --endpoints=https://192.168.10.21:2379 --cacert=/etc/kubernetes/pki/etcd/ca.crt --cert /etc/kubernetes/pki/etcd/server.crt --key /etc/kubernetes/pki/etcd/server.key snapshot save master2.db
{"level":"info","ts":"2024-01-11T11:41:52.453759+0800","caller":"snapshot/v3_snapshot.go:65","msg":"created temporary db file","path":"master2.db.part"}
{"level":"info","ts":"2024-01-11T11:41:52.461733+0800","logger":"client","caller":"v3@v3.5.9/maintenance.go:212","msg":"opened snapshot stream; downloading"}
{"level":"info","ts":"2024-01-11T11:41:52.461811+0800","caller":"snapshot/v3_snapshot.go:73","msg":"fetching snapshot","endpoint":"https://192.168.10.21:2379"}
{"level":"info","ts":"2024-01-11T11:41:52.508687+0800","logger":"client","caller":"v3@v3.5.9/maintenance.go:220","msg":"completed snapshot read; closing"}
{"level":"info","ts":"2024-01-11T11:41:52.515593+0800","caller":"snapshot/v3_snapshot.go:88","msg":"fetched snapshot","endpoint":"https://192.168.10.21:2379","size":"3.4 MB","took":"now"}
{"level":"info","ts":"2024-01-11T11:41:52.515678+0800","caller":"snapshot/v3_snapshot.go:97","msg":"saved","path":"master2.db"}
Snapshot saved at master2.db

# 验证备份
[root@master2 etcd]# ETCDCTL_API=3 etcdctl --write-out=table snapshot status master2.db
Deprecated: Use `etcdutl snapshot status` instead.

+----------+----------+------------+------------+
|   HASH   | REVISION | TOTAL KEYS | TOTAL SIZE |
+----------+----------+------------+------------+
| 5abd7f63 |   161433 |       1475 |     3.4 MB |
+----------+----------+------------+------------+

# 2.恢复
[root@master2 etcd]# ETCDCTL_API=3 etcdctl --endpoints=https://192.168.10.21:2379 --cacert=/etc/kubernetes/pki/etcd/ca.crt --cert=/etc/kubernetes/pki/etcd/server.crt --key=/etc/kubernetes/pki/etcd/server.key snapshot restore master2.db
Deprecated: Use `etcdutl snapshot restore` instead.
# 如果需要指定备份目录，添加参数 --data-dir /root/k8s/etcd
2024-01-11T11:56:49+08:00    info    snapshot/v3_snapshot.go:248    restoring snapshot    {"path": "master2.db", "wal-dir": "default.etcd/member/wal", "data-dir": "default.etcd", "snap-dir": "default.etcd/member/snap", "stack": "go.etcd.io/etcd/etcdutl/v3/snapshot.(*v3Manager).Restore\n\tgo.etcd.io/etcd/etcdutl/v3@v3.5.9/snapshot/v3_snapshot.go:254\ngo.etcd.io/etcd/etcdutl/v3/etcdutl.SnapshotRestoreCommandFunc\n\tgo.etcd.io/etcd/etcdutl/v3@v3.5.9/etcdutl/snapshot_command.go:147\ngo.etcd.io/etcd/etcdctl/v3/ctlv3/command.snapshotRestoreCommandFunc\n\tgo.etcd.io/etcd/etcdctl/v3/ctlv3/command/snapshot_command.go:129\ngithub.com/spf13/cobra.(*Command).execute\n\tgithub.com/spf13/cobra@v1.1.3/command.go:856\ngithub.com/spf13/cobra.(*Command).ExecuteC\n\tgithub.com/spf13/cobra@v1.1.3/command.go:960\ngithub.com/spf13/cobra.(*Command).Execute\n\tgithub.com/spf13/cobra@v1.1.3/command.go:897\ngo.etcd.io/etcd/etcdctl/v3/ctlv3.Start\n\tgo.etcd.io/etcd/etcdctl/v3/ctlv3/ctl.go:107\ngo.etcd.io/etcd/etcdctl/v3/ctlv3.MustStart\n\tgo.etcd.io/etcd/etcdctl/v3/ctlv3/ctl.go:111\nmain.main\n\tgo.etcd.io/etcd/etcdctl/v3/main.go:59\nruntime.main\n\truntime/proc.go:250"}
2024-01-11T11:56:49+08:00    info    membership/store.go:141    Trimming membership information from the backend...
2024-01-11T11:56:49+08:00    info    membership/cluster.go:421    added member    {"cluster-id": "cdf818194e3a8c32", "local-member-id": "0", "added-peer-id": "8e9e05c52164694d", "added-peer-peer-urls": ["http://localhost:2380"]}
2024-01-11T11:56:49+08:00    info    snapshot/v3_snapshot.go:269    restored snapshot    {"path": "master2.db", "wal-dir": "default.etcd/member/wal", "data-dir": "default.etcd", "snap-dir": "default.etcd/member/snap"}