CentOS7搭建Redis Sentinel

深碍√TFBOYSˉ_ 2022-12-23 07:04 173阅读 0赞

**目录**

什么是Redis Sentinel

搭建Redis Sentinel

启动与验证

--------------------

## 什么是Redis Sentinel ##

官方文档：[Redis 的 Sentinel 文档][Redis _ Sentinel]

## 搭建Redis Sentinel ##

首先需要在CentOS环境下准备三个redis节点和三个sentinel节点：

首先要在CentOS环境下安装好Redis，具体可以参考：[CentOS7安装Redis][CentOS7_Redis]

然后在redis的bin文件夹下创建sentinel文件夹，具体命令如下：

[root@localhost ~]# cd /usr/local/redis/bin/
    [root@localhost bin]# mkdir sentinel
    [root@localhost bin]# cd sentinel/
    [root@localhost sentinel]# mkdir 6380 6381 6382 26380 26381 26382

**1、在6380、6381、6382文件夹下创建redis.conf配置文件**

[root@localhost sentinel]# cp ../redis.conf 6380/
    [root@localhost sentinel]# cp ../redis.conf 6381/
    [root@localhost sentinel]# cp ../redis.conf 6382/

修改配置文件：

> protected-mode no
> 
> daemonize yes
> 
> port 6380

6381、6382两个节点作为6380的从节点，除了上面的配置外还需增加配置：

> slaveof 192.168.115.134 6380

**2、创建sentinel.conf配置文件**

sentinel.conf可以从redis源码中cp

[root@localhost sentinel]# cp /usr/local/redis-source/sentinel.conf 26380/
    [root@localhost sentinel]# cp /usr/local/redis-source/sentinel.conf 26381/
    [root@localhost sentinel]# cp /usr/local/redis-source/sentinel.conf 26382/

修改端口、启动方式、哨兵要监控的master信息：

> port 26380
> 
> daemonize yes
> 
> sentinel monitor mymaster 192.168.115.134 6380 2

最后一行配置代表Sentinel去监视一个名为mymaster的主服务器， 这个主服务器的 IP 地址为 192.168.115.134 ， 端口号为 6380， 而将这个主服务器判断为失效至少需要2个Sentinel同意（即至少有2个Sentinel节点存活，才能完成master的选举）。

** 3、创建批量执行脚本**

批量启动：

start-all.sh

> /usr/local/redis/bin/redis-server /usr/local/redis/bin/sentinel/6380/redis.conf  
> /usr/local/redis/bin/redis-server /usr/local/redis/bin/sentinel/6381/redis.conf  
> /usr/local/redis/bin/redis-server /usr/local/redis/bin/sentinel/6382/redis.conf  
> /usr/local/redis/bin/redis-sentinel  /usr/local/redis/bin/sentinel/26380/sentinel.conf  
> /usr/local/redis/bin/redis-sentinel  /usr/local/redis/bin/sentinel/26381/sentinel.conf  
> /usr/local/redis/bin/redis-sentinel  /usr/local/redis/bin/sentinel/26382/sentinel.conf

shutdown-all.sh

> /usr/local/redis/bin/redis-cli -p 6380 shutdown  
> /usr/local/redis/bin/redis-cli -p 6381 shutdown  
> /usr/local/redis/bin/redis-cli -p 6382 shutdown  
> /usr/local/redis/bin/redis-cli -p 26380 shutdown  
> /usr/local/redis/bin/redis-cli -p 26381 shutdown  
> /usr/local/redis/bin/redis-cli -p 26382 shutdown

最后为脚本赋予权限

[root@localhost sentinel]#  chmod +x start-all.sh shutdown-all.sh

## 启动与验证 ##

执行start-all.sh脚本：

[root@localhost sentinel]# ./start-all.sh

登录一个哨兵节点，并查看是否启动成功：

[root@localhost sentinel]# ../redis-cli -p 26380
    127.0.0.1:26380> info sentinel
    # 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=192.168.115.134:6380,slaves=2,sentinels=3

查看master节点详细信息：

127.0.0.1:26380> sentinel master mymaster

查看slave节点的详细信息：

127.0.0.1:26380> sentinel slaves mymaster

如果我们将当前的master节点下掉，哨兵会从slave节点中选举新的master：

[root@localhost sentinel]# ps -ef|grep redis
    root      40180      1  0 22:13 ?        00:00:01 /usr/local/redis/bin/redis-server *:6380
    root      40185      1  0 22:13 ?        00:00:00 /usr/local/redis/bin/redis-server *:6381
    root      40190      1  0 22:13 ?        00:00:01 /usr/local/redis/bin/redis-server *:6382
    root      40196      1  0 22:13 ?        00:00:01 /usr/local/redis/bin/redis-sentinel *:26380 [sentinel]
    root      40201      1  0 22:13 ?        00:00:01 /usr/local/redis/bin/redis-sentinel *:26381 [sentinel]
    root      40206      1  0 22:13 ?        00:00:01 /usr/local/redis/bin/redis-sentinel *:26382 [sentinel]
    
    [root@localhost sentinel]# kill -9 40180
    [root@localhost sentinel]# ../redis-cli -p 26380
    127.0.0.1:26380> info sentinel
    # 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=192.168.115.134:6381,slaves=2,sentinels=3

[Redis _ Sentinel]: http://redis.cn/topics/sentinel.html
[CentOS7_Redis]: https://hujinyang.blog.csdn.net/article/details/109777271