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redis主从配置及主从切换

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环境描述:
主redis:192.168.10.1 6379
从redis:192.168.10.2 6380

 

一、主从配置

 

1、将主从redis配置文件redis.conf中的aemonize no 改为 yes

 

2、修改从redis配置文件redis.conf中的port 6379 改为 6380,添加slaveof 192.168.10.1 6379

 

3、启动主从服务

 

      主redis:     

 

      [root@localhost redis-2.8.3]# src/redis-server /soft/redis-2.8.3-master/redis-2.8.3/redis.conf

 

     从redis:

 

     [root@localhost redis-2.8.3]# src/redis-server /soft/redis-2.8.3-slave/redis-2.8.3/redis.conf

 

4、测试数据同步

 

      主redis:

 

      [root@localhost redis-2.8.3]# src/redis-cli -p 6379
     127.0.0.1:6379> set name abc
     OK
     127.0.0.1:6379> get name
     "abc"
     127.0.0.1:6379>

 

    从redis:

 

      [root@localhost redis-2.8.3]# src/redis-cli -p 6380
     127.0.0.1:6380> get name
     "abc"
     127.0.0.1:6380>

 

5、默认是读写分离的

 

     在从redis:

 

     [root@localhost redis-2.8.3]# src/redis-cli -p 6380
     127.0.0.1:6380> set name 123
     (error) READONLY You can't write against a read only slave.

 

     

 

 二、主从切换

 

     1、停止主redis

 

     [root@localhost redis-2.8.3]# src/redis-cli -n 6379 shutdown
     [root@localhost redis-2.8.3]# src/redis-cli -p 6379
     Could not connect to Redis at 127.0.0.1:6379: Connection refused
     not connected>

 

     2、将从redis设成主redis
     [root@localhost redis-2.8.3]# src/redis-cli -p 6380 slaveof NO ONE
     OK

 

    3、测试从redis是否切换从主redis

 

     [root@localhost redis-2.8.3]# src/redis-cli -p 6380
     127.0.0.1:6380> set name 123
     OK
     127.0.0.1:6380> get name
     "123"
     127.0.0.1:6380>

 

     4、原来的主redis恢复正常了,要重新切换回去

 

         1)将现在的主redis的数据进行保存

 

     [root@localhost redis-2.8.3]# src/redis-cli -p 6380
     127.0.0.1:6380> get name
     "abc"
     127.0.0.1:6380> set name 123
     OK
     127.0.0.1:6380> get name
     "123"
     127.0.0.1:6380> save
     OK
     127.0.0.1:6380> get name
     "123"
     127.0.0.1:6380>
  

 

       2)将现在的主redis根目录下dump.rdb文件拷贝覆盖到原来主redis的根目录

 

       3)启动原来的主redis

 

      [root@localhost redis-2.8.3]# src/redis-server /soft/redis-2.8.3-master/redis-2.8.3/redis.conf
       4)在现在的主redis中切换

      [root@localhost redis-2.8.3]# src/redis-cli -p 6380 slaveof 192.168.10.1 6379
      OK

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