Redis 哨兵模式（故障自动切换）用户无感知

资源清单

#首先搭建一主两从复制环境、这里不做详细介绍 之前的文章有写过

主：10.0.0.100
从：10.0.0.101
从：10.0.0.102

三个节点分别启动一个哨兵

哨兵sentinel配置

vim  /usr/local/redis/sentinel.conf
port 26379
daemonize yes
protected-mode no
pidfile "/var/run/redis-sentinel_26379.pid"
logfile "/data/logs/redis/26379.log"
#设定监控地址，为对应的主redis库的内网地址，mymaster为集群名字，可以根据情况自己修改
sentinel monitor mymaster 10.0.0.100 6379 2  
#指定了Sentinel认为服务器已经断线所需的毫秒数。
sentinel down-after-milliseconds mymaster 3000
#设置集群从判断节点挂掉，到执行故障转移操作（即重新选举master节点）的时间
sentinel failover-timeout mymaster 10000
#主数据库密码,需要将配置放在sentinel monitor mymaster 10.0.0.100 6379 2下面
sentinel auth-pass mymaster 123

启动哨兵

10.0.0.100    redis-sentinel /usr/local/redis/sentinel.conf
10.0.0.101    redis-sentinel /usr/local/redis/sentinel.conf
10.0.0.102    redis-sentinel /usr/local/redis/sentinel.conf

查看进程

[root@redis01 redis]# redis-sentinel /usr/local/redis/sentinel.conf 
[root@redis01 redis]# ps -ef|grep redis
root      12179      1  0 16:55 ?        00:00:00 redis-server 0.0.0.0:6379
root      12206      1  0 17:02 ?        00:00:00 redis-sentinel *:26379 [sentinel]
root      12212  11984  0 17:03 pts/0    00:00:00 grep --color=auto redis

查看哨兵状态

redis-cli -h 10.0.0.100 -p 26379 -a 123 info Sentinel

[root@redis01 redis]# redis-cli -h 10.0.0.100 -p 26379 -a 123 info Sentinel
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
Warning: AUTH failed
# Sentinel
sentinel_masters:1
sentinel_tilt:0
sentinel_running_scripts:0
sentinel_scripts_queue_length:0
sentinel_simulate_failure_flags:0
master0:name=mymaster,status=ok,address=10.0.0.100:6379,slaves=2,sentinels=3

杀死主库进行故障测试

10.0.0.100     pkill redis-server   
#30秒后再启动
10.0.0.100     redis-server /usr/local/redis/redis.conf

查看哨兵状态及主库的调度情况

[root@redis01 redis]# redis-cli -h 10.0.0.100 -p 26379 -a 123 info Sentinel
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
Warning: AUTH failed
# Sentinel
sentinel_masters:1
sentinel_tilt:0
sentinel_running_scripts:0
sentinel_scripts_queue_length:0
sentinel_simulate_failure_flags:0
master0:name=mymaster,status=ok,address=10.0.0.101:6379,slaves=2,sentinels=3
#状态ok      # IP已切换到10.0.0.101      #从库2个         #哨兵3个             ！正常 ！

测试期间带有一些key，过程也添加了一些、只要用默认的配置做RDB持久化数据不会丢失