redis主从架构与redis+sentinel 哨兵机制架构搭建（生产可用）

╰半橙微兮° 2022-01-17 10:13 274阅读 0赞

redis的搭建过程，请参考 [https://blog.51cto.com/12445535/2385106][https_blog.51cto.com_12445535_2385106]

接下来，我们再找一台服务器，进行安装redis 实现redis的主从架构

和上面的方法搭建一个redis  
只不过  
在从redis中的配置文件中写  
\[root@prd3-redis02-10-184 conf\]\# grep slaveof 6379.conf  
\#\#\#\#\#\#\#\# slaveof <masterip> <masterport>  
slaveof 192.168.10.183 6379 //直接添加这个一行，然后

启动redis  
\[root@prd3-redis02-10-184 conf\]\# redis-server /ivargo/app/redis/conf/6379.conf

接下来就是看差距

在主redis可以看到  
\[root@prd3-redis01-10-183 conf\]\# redis-cli -a XXX  
Warning: Using a password with '-a' option on the command line interface may not be safe.  
127.0.0.1:6379> info

# Replication #

role:master  
connected\_slaves:1

在从redis上可以看到  
\[root@prd3-redis02-10-184 conf\]\# redis-cli -aXXX  
Warning: Using a password with '-a' option on the command line interface may not be safe.  
127.0.0.1:6379> info  
\#\#\#\#\#\#\# Replication  
role:slave  
master\_host:192.168.10.183  
master\_port:6379

这样redis的主从就搭建好了

搭建完redis后，目录结构

[root@prd3-redis01-10-183 ivargo]# pwd
    /ivargo
    [root@prd3-redis01-10-183 ivargo]# tree 
    .
    ├── app
    │   ├── redis
    │   │   ├── 6379.pid
    │   │   ├── conf
    │   │   │   └── 6379.conf
    │   │   ├── data
    │   │   │   ├── 6379.rdb
    │   │   │   └── appendonly_6379.aof
    │   │   └── log
    │   └── sentinel
    │       └── conf
    └── log
        └── 6379.log
    
    8 directories, 5 files

实现redis的sentinel 
    [root@prd3-redis01-10-183 conf]# pwd
    /ivargo/app/sentinel/conf
    [root@prd3-redis01-10-183 conf]# cat sentinel.conf  //这个配置文件是prd3上的sentinel的配置文件，我们需要修改的
    # Example sentinel.conf
    # bind 127.0.0.1 192.168.1.1
    bind 0.0.0.0
    protected-mode no
    port 26379
    daemonize yes
    loglevel notice
    logfile "/ivargo/log/sentinel.log"
    dir "/tmp"
    # sentinel auth-pass <master-name> <password>
    # sentinel down-after-milliseconds <master-name> <milliseconds>
    # Default is 30 seconds.
    sentinel myid ba794535d3a65e14b266e28462fa7c68de609f39
    # sentinel parallel-syncs <master-name> <numslaves>
    sentinel deny-scripts-reconfig yes
    # sentinel failover-timeout <master-name> <milliseconds>
    # Default is 3 minutes = 180000.
    sentinel monitor mymaster 10.80.85.20 6379 2
    # Generated by CONFIG REWRITE
    sentinel down-after-milliseconds mymaster 6000
    sentinel auth-pass mymaster xxx
    sentinel config-epoch mymaster 0
    sentinel leader-epoch mymaster 1
    sentinel known-slave mymaster 10.80.85.21 6379
    sentinel known-sentinel mymaster 10.80.85.21 26379 c3002e02c6a2d0041afd2569f3fd1985bc38993e
    sentinel current-epoch 1

[root@prd3-redis01-10-183 conf]# cat sentinel.conf  //这里面都是我们自己指定的，他其他的文件内容，都是他自己生成的
    # Example sentinel.conf
    # bind 127.0.0.1 192.168.1.1
    bind 0.0.0.0
    protected-mode no
    port 26379
    daemonize yes
    loglevel notice
    logfile "/ivargo/log/sentinel.log"
    pidfile "/ivargo/app/sentinel/26379.pid"
    dir "/tmp"
    sentinel monitor mymaster 192.168.10.183 6379 2
    sentinel auth-pass mymaster XXX
    
    184上的sentinel配置文件和183一样的
    
    [root@prd3-redis01-10-183 conf]# redis-sentinel /ivargo/app/sentinel/conf/sentinel.conf
    [root@prd3-redis02-10-184 conf]# redis-sentinel /ivargo/app/sentinel/conf/sentinel.conf

[root@prd3-redis01-10-183 conf]# cat sentinel.conf                                        
    # Example sentinel.conf
    # bind 127.0.0.1 192.168.1.1
    bind 0.0.0.0
    protected-mode no
    port 26379
    daemonize yes
    loglevel notice
    logfile "/ivargo/log/sentinel.log"
    pidfile "/ivargo/app/sentinel/26379.pid"
    dir "/tmp"
    sentinel myid 6075d58bdc7c2602f98d90c0aa48470c4dbb50d9
    sentinel deny-scripts-reconfig yes
    # Generated by CONFIG REWRITE
    sentinel monitor mymaster 192.168.10.183 6379 2
    sentinel auth-pass mymaster XXX
    sentinel config-epoch mymaster 0
    sentinel leader-epoch mymaster 0
    sentinel known-slave mymaster 192.168.10.184 6379
    sentinel known-sentinel mymaster 192.168.10.184 26379 039bd11a572245b6c16c6e204523d781ffb6ba4c
    sentinel current-epoch 0
    
    查看不同点
    
    我们检查
    [root@prd3-redis01-10-183 conf]# redis-cli -h 192.168.10.183 -p 26379 info 
    # 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=192.168.10.183:6379,slaves=1,sentinels=2

验证sentinel高可用
    [root@prd3-redis01-10-183 redis]# kill `cat 6379.pid`
    杀死183的进程
    然后在184上看
    [root@prd3-redis02-10-184 conf]# redis-cli -h 192.168.10.183 -p 26379 info  
    # 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=192.168.10.184:6379,slaves=1,sentinels=2  //主节点变成了184了
    
    在启动183
    [root@prd3-redis01-10-183 redis]# redis-server /ivargo/app/redis/conf/6379.conf 
    [root@prd3-redis01-10-183 redis]# redis-cli -h 192.168.10.183 -p 26379 info
    # 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=192.168.10.184:6379,slaves=1,sentinels=2
    
    然后查看redis 原来的183是主节点，现在是从节点了
    [root@prd3-redis01-10-183 redis]# redis-cli -h 192.168.10.183 -p 6379 -a XXX info 
    # Replication
    role:slave
    master_host:192.168.10.184
    master_port:6379
    
    [root@prd3-redis02-10-184 conf]# redis-cli -h 192.168.10.184 -p 6379 -a XXX info  
    # Replication
    role:master
    connected_slaves:1
    slave0:ip=192.168.10.183,port=6379,state=online,offset=169470,lag=1
    
    以上实现了redis的sentinel机制 也就是 HA机制

其实对于现上环境的话，当redis发生了主从切换的时候，这个比如程序调用的ip就会改变，写两个ip和两个sentinel地址显然是不合理的，我们可以实现vip机制自动切换，来实现程序调用只需要一个ip，相关内容，请期待。

转载于:https://blog.51cto.com/12445535/2385117

[https_blog.51cto.com_12445535_2385106]: https://blog.51cto.com/12445535/2385106