127.0.0.1     7000     master

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127.0.0.1     7001     slave

127.0.0.1     7002     slave

127.0.0.1     7003     slave

查看主上面连接的从

redis-cli -p 7000 info Replication

# Replication

role:master

connected_slaves:3

slave0:ip=127.0.0.1,port=7001,state=online,offset=2532,lag=0

slave1:ip=127.0.0.1,port=7002,state=online,offset=2532,lag=0

slave2:ip=127.0.0.1,port=7003,state=online,offset=2532,lag=1

master_repl_offset:2532

repl_backlog_active:1

repl_backlog_size:1048576

repl_backlog_first_byte_offset:2

repl_backlog_histlen:2531

创建sentinel配置文件

vim /redis_test/7000/sentinel.conf

port 26379

sentinel monitor master 127.0.0.1 7000 2

sentinel down-after-milliseconds master 5000

sentinel failover-timeout master 60000

sentinel config-epoch master 12

vim /redis_test/7001/sentinel.conf

port 26479

sentinel monitor master 127.0.0.1 7000 2

sentinel down-after-milliseconds master 5000

sentinel failover-timeout master 60000

sentinel config-epoch master 12

vim /redis_test/7002/sentinel.conf

port 26579

sentinel monitor master 127.0.0.1 7000 2

sentinel down-after-milliseconds master 5000

sentinel failover-timeout master 60000

sentinel config-epoch master 12

启动sentinel

/usr/src/redis/src/redis-server /redis_database/7000/sentinel.conf --sentinel &

/usr/src/redis/src/redis-server /redis_database/7001/sentinel.conf --sentinel &

/usr/src/redis/src/redis-server /redis_database/7002/sentinel.conf --sentinel &

将主7000关掉

redis-cli -p 7000 shutdown

redis-cli -p 7002 info replication

# Replication

role:master

connected_slaves:2

slave0:ip=127.0.0.1,port=7001,state=online,offset=6345,lag=0

slave1:ip=127.0.0.1,port=7003,state=online,offset=6345,lag=0

master_repl_offset:6345

repl_backlog_active:1

repl_backlog_size:1048576

repl_backlog_first_byte_offset:2

repl_backlog_histlen:6344

可以发现7002变成了新的主库

本文标题：redis自动主从切换
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