3台服务器Redis高可用哨兵模式实现(6)

主：

port 26379
pidfile "/usr/local/redis/var/redis-sentinel.pid"
dir "/usr/local/redis/data/sentinel"
daemonize yes
logfile "/usr/local/redis/var/redis-sentinel.log"
sentinel myid aeff525d03a2234ef834808f7991761db03a1973
sentinel monitor mymaster 10.1.0.160 6379 2
sentinel parallel-syncs mymaster 2
sentinel auth-pass mymaster 20170310
# Generated by CONFIG REWRITE
sentinel config-epoch mymaster 0
sentinel leader-epoch mymaster 0
sentinel known-slave mymaster 10.1.0.71 6379
sentinel known-slave mymaster 10.1.0.161 6379
sentinel current-epoch 0

从1：

port 26379
pidfile "/usr/local/redis/var/redis-sentinel.pid"
dir "/usr/local/redis/data/sentinel"
daemonize yes
logfile "/usr/local/redis/var/redis-sentinel.log"
sentinel myid 01b1b7674abe648f6a2344fc5610e73b7e87cb8a
sentinel monitor mymaster 10.1.0.160 6379 2
sentinel config-epoch mymaster 0
# Generated by CONFIG REWRITE
sentinel leader-epoch mymaster 0
sentinel current-epoch 0

从2：

port 26379
pidfile "/usr/local/redis/var/redis-sentinel.pid"
dir "/usr/local/redis/data/sentinel"
daemonize yes
logfile "/usr/local/redis/var/redis-sentinel.log"
sentinel myid f1589f48079b3b3b536add4e2e01a36304aeba8c
sentinel monitor mymaster 10.1.0.160 6379 2
sentinel config-epoch mymaster 0
# Generated by CONFIG REWRITE
sentinel leader-epoch mymaster 0
sentinel current-epoch 0

模拟主故障

[root@show160 redis]# /usr/local/redis/bin/redis-cli -p 6379
127.0.0.1:6379> AUTH 20170310
OK
127.0.0.1:6379> DEBUG SEGFAULT
Could not connect to Redis at 127.0.0.1:6379: Connection refused
not connected> quit

从哨兵配置文件中可以看到当前的主库的已经发生了改变

4. 总结

redis的哨兵端口26379使用redis-cli可以连接查看哨兵相关信息，要想连接此高可用redis，可使用官方的连接客户端。使用哨兵监控当主故障后会自动切换从为主，当主启动后就变成了从。至少要3哨兵和3redis节点才能允许挂一节点还能保证服务可用性。

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