etcd单节点数据备份与恢复

插入测试数据

# etcdctl put  smith
# etcdctl put  allen
# etcdctl put  ward
# etcdctl put  jones
# etcdctl put  martin
# etcdctl put  blake
# etcdctl put  clark
# etcdctl put  scott
# etcdctl put  king
# etcdctl put  turner
# etcdctl put  adams
# etcdctl put  james
# etcdctl put  ford
# etcdctl put  miller 

查看数据

# etcdctl get --prefix ""
adams

allen

blake

clark

ford

james

jones

king

martin

miller

scott

smith

turner

ward

做快照

# etcdctl snapshot save backup.db
{"level":"info","ts":1570085496.5022638,"caller":"snapshot/v3_snapshot.go:109","msg":"created temporary db file","path":"backup.db.part"}
{"level":"warn","ts":"2019-10-03T14:51:36.503+0800","caller":"clientv3/retry_interceptor.go:116","msg":"retry stream intercept"}
{"level":"info","ts":1570085496.5036564,"caller":"snapshot/v3_snapshot.go:120","msg":"fetching snapshot","endpoint":"127.0.0.1:2379"}
{"level":"info","ts":1570085496.5214782,"caller":"snapshot/v3_snapshot.go:133","msg":"fetched snapshot","endpoint":"127.0.0.1:2379","took":0.018938519}
{"level":"info","ts":1570085496.521635,"caller":"snapshot/v3_snapshot.go:142","msg":"saved","path":"backup.db"}
Snapshot saved at backup.db

查看快照信息

# etcdctl snapshot status backup.db --write-out=table
+----------+----------+------------+------------+
|   HASH   | REVISION | TOTAL KEYS | TOTAL SIZE |
+----------+----------+------------+------------+
| 6d1803a9 |       |         |       kB |
+----------+----------+------------+------------+

清空数据

# etcdctl del --prefix ""

删除当前etcd的data目录，否则会报错目录已存在

# rm -rf /usr/local/etcd/data

恢复数据

# etcdctl snapshot restore backup.db --data-dir="/usr/local/etcd/data"
{"level":"info","ts":1570085656.639806,"caller":"snapshot/v3_snapshot.go:286","msg":"restoring snapshot","path":"backup.db","wal-dir":"/usr/local/etcd/data/member/wal","data-dir":"/usr/local/etcd/data","snap-dir":"/usr/local/etcd/data/member/snap"}
{"level":"info","ts":1570085656.7266932,"caller":"membership/cluster.go:392","msg":"added member","cluster-id":"cdf818194e3a8c32","local-member-id":"","added-peer-id":"8e9e05c52164694d","added-peer-peer-urls":["http://localhost:2380"]}
{"level":"info","ts":1570085656.7834268,"caller":"snapshot/v3_snapshot.go:299","msg":"restored snapshot","path":"backup.db","wal-dir":"/usr/local/etcd/data/member/wal","data-dir":"/usr/local/etcd/data","snap-dir":"/usr/local/etcd/data/member/snap"}

恢复完成后需要将从备份重新生成的data目录的属主和属组修改为etcd系统服务中的对应属主和属组

# chown -R tnuser.dba /usr/local/etcd/data

重启etcd系统服务

# systemctl stop etcd
# systemctl start etcd

再次查看恢复的数据

# etcdctl get --prefix ""
adams

allen

blake

clark

ford

james

jones

king

martin

miller

scott

smith

turner

ward