环境描述:
主redis:192.168.10.1 6379
从redis:192.168.10.2 6380
主mkdir –p /etc/redis
cd /etc/redis
mkdir 6379
从mkdir –p /etc/redis
cd /etc/redis
mkdir 6380
编译redis
cd /usr/local/src/
wget http://download.redis.io/releases/redis-3.0.5.tar.gz
tar zxvf ./redis-3.0.3.tar.gz
cd redis-3.0.3
make
make install
cp /usr/local/src/redis-3.0.3/src/redis-server /etc/redis/6379/
cp /usr/local/src/redis-3.0.3/redis.conf /etc/redis/6379/
cp /usr/local/src/redis-3.0.3/src/redis-server /etc/redis/6380/
cp /usr/local/src/redis-3.0.3/redis.conf /etc/redis/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,并添加slaveof 192.168.10.1 6379 的配置
3、开启AOF机制 appendoly yes
3、启动主从服务
主redis:
[root@localhost redis-2.8.3]# ./redis-server redis.conf
从redis:
[root@localhost redis-2.8.3]# ./redis-server 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)将现在的从redis根目录下dump.rdb文件拷贝覆盖到原来主redis的根目录下dump.rdb
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
查看redis链接数
- 查看redis最大链接数
Show variables like ‘%max_connections%/’
- 修改最大链接数
Set GLOBAL max_connections = 200;