概述

光说不练假把式，现在就开始部署哨兵集群，以及如何基于哨兵进行故障转移。

哨兵配置

• 哨兵默认用的是26379端口
• 默认不能跟其他机器的指定端口连通
• 只能通过本地访问

1. 创建两个目录：配置文件目录

mkdir /etc/sentinal
mkdir -p /var/sentinal/5000
[redis-4.0.11]# cp sentinel.conf /etc/sentinal/5000.conf

2. 配置文件：/etc/sentinel/5000.conf

port 5000
bind 172.30.0.11
protected-mode no
daemonize yes
logfile "/var/log/redis/5000.log"
dir /var/sentinal/5000
sentinel monitor mymaster 172.30.0.11 6379 2
sentinel down-after-milliseconds mymaster 30000
sentinel failover-timeout mymaster 60000
sentinel parallel-syncs mymaster 1
sentinel auth-pass mymaster pass1234

port 5000
bind 172.30.0.4
protected-mode no
daemonize yes
logfile "/var/log/redis/5000.log"
dir /var/sentinal/5000
sentinel monitor mymaster 172.30.0.11 6379 2
sentinel down-after-milliseconds mymaster 30000
sentinel failover-timeout mymaster 60000
sentinel parallel-syncs mymaster 1

port 5000
bind 172.30.0.10
protected-mode no
daemonize yes
logfile "/var/log/redis/5000.log"
dir /var/sentinal/5000
sentinel monitor mymaster 172.30.0.11 6379 2
sentinel down-after-milliseconds mymaster 30000
sentinel failover-timeout mymaster 60000
sentinel parallel-syncs mymaster 1

启动哨兵进程

在三台机器上分别启动三个哨兵进程，用来组成一个集群，并且观察日志的输出：

redis-sentinel /etc/sentinal/5000.conf
redis-server /etc/sentinal/5000.conf --sentinel

日志展示信息：

• 每个哨兵都能监控到redis master
• 每个哨兵能够自动发现其他的slave
• 哨兵之间通过pub/sub消息发布和订阅channel消息系统和机制会自动进行发现

检查哨兵状态

redis-cli -h 172.30.0.11 -p 5000
sentinel master mymaster
SENTINEL slaves mymaster
SENTINEL sentinels mymaster
SENTINEL get-master-addr-by-name mymaster