NoSQL 数据库案例实战 --Redis 高可用解决方案--Redis + 哨兵（项目实战）

前言

本环境是基于 Centos 7.8 系统构建Redis学习环境
具体构建，请参考 Redis-5.0.9环境部署

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一、哨兵架构设计

二、环境准备

role	host	ip	Redis-Version
master	node01	192.168.5.11	Redis-5.0.9
slave1	node02	192.168.5.12	Redis-5.0.9
slave2	node03	192.168.5.13	Redis-5.0.9

注：本环境基于redis-yum方式安装

三、配置主从同步

master

[root@node01 ~]# vim /etc/redis.conf 
bind 192.168.5.11
daemonize yes
appendonly yes
[root@node01 ~]# systemctl enable --now redis

slave1

[root@node02 ~]# vim /etc/redis.conf 
bind 192.168.5.12
daemonize yes
appendonly yes
replicaof 192.168.5.11 6379
[root@node02 ~]# systemctl enable --now redis

slave2

[root@node03 ~]# vim /etc/redis.conf
bind 192.168.5.13
daemonize yes
appendonly yes
replicaof 192.168.5.11 6379
[root@node03 ~]# systemctl enable --now redis

检查主从同步状态

master

slave1

slave2

主从同步配置成功！！！

四、配置哨兵服务

修改l配置文件
master

[root@node01 ~]# vim /etc/redis-sentinel.conf 
daemonize yes
sentinel monitor mymaster 192.168.5.11 6379 2
[root@node01 ~]# systemctl enable --now redis-sentinel.service 
Created symlink from /etc/systemd/system/multi-user.target.wants/redis-sentinel.service to /usr/lib/systemd/system/redis-sentinel.service.
[root@node01 ~]# netstat -lnutp | grep 6379
tcp        0      0 192.168.5.11:26379      0.0.0.0:*               LISTEN      11911/redis-sentine 
tcp        0      0 192.168.5.11:6379       0.0.0.0:*               LISTEN      1698/redis-server 1 

slave1

[root@node02 ~]# vim /etc/redis-sentinel.conf
bind 192.168.5.11
daemonize yes
sentinel monitor mymaster 192.168.5.11 6379 2
[root@node02 ~]# systemctl enable --now redis-sentinel.service 
Created symlink from /etc/systemd/system/multi-user.target.wants/redis-sentinel.service to /usr/lib/systemd/system/redis-sentinel.service.
[root@node02 ~]# netstat -lnutp | grep 6379
tcp        0      0 192.168.5.12:26379      0.0.0.0:*               LISTEN      11884/redis-sentine 
tcp        0      0 192.168.5.12:6379       0.0.0.0:*               LISTEN      1717/redis-server 1 

slave2

[root@node03 ~]# vim  /etc/redis-sentinel.conf 
bind 192.168.5.13
daemonize yes
sentinel monitor mymaster 192.168.5.11 6379 2
[root@node03 ~]# systemctl enable --now redis-sentinel.service 
Created symlink from /etc/systemd/system/multi-user.target.wants/redis-sentinel.service to /usr/lib/systemd/system/redis-sentinel.service.
[root@node03 ~]# netstat -lnutp | grep 6379
tcp        0      0 192.168.5.13:26379      0.0.0.0:*               LISTEN      11791/redis-sentine 
tcp        0      0 192.168.5.13:6379       0.0.0.0:*               LISTEN      1648/redis-server 1 

查看sentinel状态

追踪sentinel日志文件

查看sentinel信息

查看master sentinel信息

查看salve sentinel信息

五、模拟 sentinel 故障切换

停止master redis服务

[root@node01 ~]# systemctl stop redis
[root@node01 ~]# netstat -lnutp | grep redis
tcp        0      0 192.168.5.11:26379      0.0.0.0:*               LISTEN      11911/redis-sentine 

3min后查看状态主从状态

master切换到node02

追踪日志

查看主从状态

master写入、删除数据

故障切换成功！！！

启动node01 redis服务

[root@node01 ~]# systemctl start redis
[root@node01 ~]# netstat -lnutp | grep redis
tcp        0      0 192.168.5.11:6379       0.0.0.0:*               LISTEN      12031/redis-server  
tcp        0      0 192.168.5.11:26379      0.0.0.0:*               LISTEN      11911/redis-sentine

查看主从状态

master写入数据，salve查看同步状况

master写入数据
node01查看

node03查看

故障转移、故障切换功能实现！！！

故障恢复成功（非抢占式选举角色）

注：master发送故障后，sentinel 通过更改节点配置文件的方式，切换校色的，从而达到故障转移、故障切换的要求

Redis 哨兵配置成功！！！