Redis 数据备份与恢复

Redis所有数据都是保存在内存中，Redis数据备份可以定期的通过异步方式保存到磁盘上，该方式称为半持久化模式，如果每一次数据变化都写入aof文件里面，则称为全持久化模式。同时还可以基于Redis主从复制实现Redis备份与恢复。

[root@k8s-master1 bin]# ./redis-cli -h 192.168.210.85 -p 6379

Master85:

192.168.210.85:6379> info replication

# Replication

role:master

connected_slaves:0

master_replid:145346920da531a82dd62c0b7130c9ea48e8101f

master_replid2:982b93c14b73dda8088029b664f377361fa5e7b9

master_repl_offset:503252

second_repl_offset:497019

repl_backlog_active:1

repl_backlog_size:1048576

repl_backlog_first_byte_offset:338764

repl_backlog_histlen:164489

192.168.210.85:6379> set k1 v1

192.168.210.85:6379> set k2 v2

192.168.210.85:6379> set k3 v3

192.168.210.85:6379> set k4 v4

192.168.210.85:6379> get k1

"v1"

192.168.210.85:6379> get k2

"v2"

192.168.210.85:6379> get k3

"v3"

192.168.210.85:6379> get k4

"v4"

192.168.210.85:6379> SAVE

Slave177

192.168.210.177:6379> get k1

"v1"

192.168.210.177:6379> get k2

"v2"

192.168.210.177:6379> get k3

"v3"

192.168.210.177:6379> get k4

"v4"

192.168.210.85:6379> CONFIG GET dir

1) "dir"

2) "/data/redis"

以上命令 CONFIG GET dir 输出的 redis 备份目录为 /

192.168.210.85:6379> shutdown

not connected> exit

[root@k8s-master1 bin]# ./redis-cli -h 192.168.210.85 -p 6379

Could not connect to Redis at 192.168.210.85:6379: Connection refused

not connected>

重启85服务器主节点切换到177服务器,切换到master

[root@k8s-master1 bin]# ./redis-cli -h 192.168.210.85 -p 6379

192.168.210.85:6379> DBSIZE

(integer) 4

192.168.210.85:6379> keys *

1) "k4"

2) "k1"

3) "k2"

4) "k3"

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