redis恢复(aof)

雨点打透心脏的1/2处 2023-02-26 04:26 27阅读 0赞

\----------------redis备份恢复方法-----------------------------  
1.采用aof恢复方法  
若appendonly设置为no的情况下,在每个节点上执行bgrewriteaof命令生成一个aof文件  
若appendonly已经为yes的话,在data目录会自动生成有aof文件  
我这里是appendonly设置为no的,所以在每个节点上执行如下命令  
./redis-cli -c -h 192.168.1.118 -p 1001  
./redis-cli -c -h 192.168.1.118 -p 1002  
./redis-cli -c -h 192.168.1.118 -p 1003

./redis-cli -c -h 192.168.1.85 -p 2001  
./redis-cli -c -h 192.168.1.85 -p 2002  
./redis-cli -c -h 192.168.1.85 -p 2003  
如下:  
192.168.1.118:1001> bgrewriteaof  
Background append only file rewriting started  
要是数据量很大的话,生成aof文件需要些时间  
生成的aof文件是一些指令命令  
\[root@localhost c3\]\# more c3.aof  
\*2  
$6  
SELECT  
$1  
0  
\*3  
$3  
SET  
$6  
name15  
$15  
huangxueliang15  
\*3  
$3  
SET  
$6  
name25  
$15  
huangxueliang25  
\*3  
$3  
SET  
$6  
name18  
$15  
huangxueliang18

执行以上脚本后,在每个节点的data目录下都会生成一个aof文件

2.停掉现有的集群  
192.168.1.118  
./redis-cli -c -h 192.168.1.118 -p 1001 shutdown  
./redis-cli -c -h 192.168.1.118 -p 1002 shutdown  
./redis-cli -c -h 192.168.1.118 -p 1003 shutdown

192.168.1.85  
./redis-cli -c -h 192.168.1.85 -p 2001 shutdown  
./redis-cli -c -h 192.168.1.85 -p 2002 shutdown  
./redis-cli -c -h 192.168.1.85 -p 2003 shutdown

3.初始化集群(删除data目录下的相应文件)  
A.cluster-config-file指定的文件  
B.data目录下的aof文件,文件我们不能删除,可以重命名的方式  
C.data目录下的rdb文件  
我这里是采用mv的方式  
\[root@localhost c1\]\# pwd  
/opt/redis\_cluster/data/c1  
\[root@localhost c1\]\# mv c1.aof bak\_c1.aof  
\[root@localhost c1\]\# rm c1.conf  
\[root@localhost c1\]\# mv dump-c1.rdb bak\_dump-c1.rdb

4.初始化集群(修改集群各节点端口号)  
192.168.1.118(c1.conf,c2.conf,c3.conf)  
1001->7001  
1002->7002  
1003->7003

192.168.1.85(c1.conf,c2.conf,c3.conf)  
2001->8001  
2002->8002  
2003->8003

5.初始化集群(启动各节点)  
192.168.1.118  
/opt/redis\_cluster/bin/redis-server /opt/redis\_cluster/conf/c1.conf  
/opt/redis\_cluster/bin/redis-server /opt/redis\_cluster/conf/c2.conf  
/opt/redis\_cluster/bin/redis-server /opt/redis\_cluster/conf/c3.conf

192.168.1.85  
/opt/redis\_cluster/bin/redis-server /opt/redis\_cluster/conf/c1.conf  
/opt/redis\_cluster/bin/redis-server /opt/redis\_cluster/conf/c2.conf  
/opt/redis\_cluster/bin/redis-server /opt/redis\_cluster/conf/c3.conf

5.初始化集群(创建集群)  
/opt/redis\_cluster/redis-trib.rb create --replicas 1 192.168.1.118:7001 192.168.1.118:7002 192.168.1.118:7003 192.168.1.85:8001 192.168.1.85:8002 192.168.1.85:8003

\[root@localhost redis\_cluster\]\# ./redis-trib.rb check 192.168.1.118:7001  
>>> Performing Cluster Check (using node 192.168.1.118:7001)  
M: 9af2a4297106fd62ca577946781f476b44bbd170 192.168.1.118:7001  
slots:0-5460 (5461 slots) master  
1 additional replica(s)  
M: e2b286b2ce65b2afa4d9afabc9fbadb4106824d3 192.168.1.118:7002  
slots:10923-16383 (5461 slots) master  
1 additional replica(s)  
S: fffaad68a73c0fe62e190c1bb39d92cdcb424eab 192.168.1.85:8003  
slots: (0 slots) slave  
replicates e2b286b2ce65b2afa4d9afabc9fbadb4106824d3  
M: 68783efacb82dc3a52570f593aaa2fe40fb6623e 192.168.1.85:8001  
slots:5461-10922 (5462 slots) master  
1 additional replica(s)  
S: 57a7b5eb8e1612bac7f16bcf7e6d0df9a4c5e3a0 192.168.1.85:8002  
slots: (0 slots) slave  
replicates 9af2a4297106fd62ca577946781f476b44bbd170  
S: 078dc90bbe8d55b6aa6b321704cbe6baa8394505 192.168.1.118:7003  
slots: (0 slots) slave  
replicates 68783efacb82dc3a52570f593aaa2fe40fb6623e  
\[OK\] All nodes agree about slots configuration.  
>>> Check for open slots...  
>>> Check slots coverage...  
\[OK\] All 16384 slots covered

可以看到当前的集群是没有数据的  
\[root@localhost bin\]\# ./redis-cli -c -h 192.168.1.118 -p 7001  
192.168.1.118:7001> keys \*  
(empty list or set)

6.数据恢复  
步骤3的时候每个节点我们都备份了一个aof文件,那么我们采用该文件进行恢复  
192.168.1.118:7001  
./redis-cli -h 192.168.1.118 -p 7001 --pipe < /opt/redis\_cluster/data/c1/bak\_c1.aof  
All data transferred. Waiting for the last reply...  
Last reply received from server.  
errors: 0, replies: 11

这里导入了11条记录,也就是原来节点的数据

192.168.1.118:7002  
./redis-cli -h 192.168.1.118 -p 7002 --pipe < /opt/redis\_cluster/data/c2/bak\_c2.aof

192.168.1.118:7003  
\[root@localhost bin\]\# ./redis-cli -h 192.168.1.118 -p 7003 --pipe < /opt/redis\_cluster/data/c3/bak\_c3.aof  
All data transferred. Waiting for the last reply...  
MOVED 10325 192.168.1.85:8001  
MOVED 6586 192.168.1.85:8001  
MOVED 7702 192.168.1.85:8001  
MOVED 10767 192.168.1.85:8001  
MOVED 6888 192.168.1.85:8001  
MOVED 7012 192.168.1.85:8001  
MOVED 6462 192.168.1.85:8001  
MOVED 10589 192.168.1.85:8001  
MOVED 7368 192.168.1.85:8001  
MOVED 6764 192.168.1.85:8001  
MOVED 8090 192.168.1.85:8001  
MOVED 5878 192.168.1.85:8001  
MOVED 7244 192.168.1.85:8001  
MOVED 10713 192.168.1.85:8001  
MOVED 10891 192.168.1.85:8001  
MOVED 7966 192.168.1.85:8001  
Last reply received from server.  
errors: 16, replies: 17  
\[root@localhost bin\]\#  
发现该节点是从节点,不需要导入数据,从上面的配置信息发现也是报错

以下操作发现是从节点的也会报上面的错误  
192.168.1.85:8001  
./redis-cli -h 192.168.1.85 -p 8001 --pipe < /opt/redis\_cluster/data/c1/bak\_c1.aof  
192.168.1.85:8002  
./redis-cli -h 192.168.1.85 -p 8002 --pipe < /opt/redis\_cluster/data/c2/bak\_c2.aof  
192.168.1.85:8003  
./redis-cli -h 192.168.1.85 -p 8003 --pipe < /opt/redis\_cluster/data/c3/bak\_c3.aof

其实恢复过程只需要主节点上的aof文件即可

7.检查数据恢复情况(检查主节点上的记录即可)  
\[root@localhost bin\]\# ./redis-cli -h 192.168.1.118 -p 7001  
192.168.1.118:7001> keys \*  
1) "name40"  
2) "name22"  
3) "name31"  
4) "name26"  
5) "name35"  
6) "name08"  
7) "name04"  
8) "name17"  
9) "name13"  
10) "name39"

\[root@localhost bin\]\# ./redis-cli -h 192.168.1.118 -p 7002  
192.168.1.118:7002> keys \*  
1) "name10"  
2) "name03"  
3) "name19"  
4) "name25"  
5) "name06"  
6) "name14"  
7) "name36"  
8) "name02"  
9) "name07"  
10) "name29"  
11) "name21"  
12) "name32"  
13) "name15"  
14) "name18"  
15) "name11"  
192.168.1.118:7002>

\[root@localhost bin\]\# ./redis-cli -h 192.168.1.85 -p 8001  
192.168.1.85:8001> keys \*  
1) "name33"  
2) "name30"  
3) "name34"  
4) "name23"  
5) "name01"  
6) "name05"  
7) "name09"  
8) "name20"  
9) "name12"  
10) "name24"  
11) "name37"  
12) "name27"  
13) "name16"  
14) "name28"  
15) "name38"

可以看到数据以及恢复,原来集群里的数据是name1-name40