docker-compose一键搭建redis(一主两从三哨兵)服务

向右看齐 2023-01-16 12:24 217阅读 0赞

一、部署redis主从服务

1、目录结构

[root@sgpexchangemysql-192-168-8-61 rediscluster]# ls *
    master:
    data  docker-compose.yml  docker-compose.yml_bak
    
    slave01:
    data
    
    slave02:
    data

2、查看redis的docker-compose.yml文件内容

[root@sgpexchangemysql-192-168-8-61 rediscluster]# cat master/docker-compose.yml
    version: '3.7'
    services:
      master:
        image: redis
        container_name: redis-master
        restart: always
        command: redis-server --requirepass 123456 --masterauth 123456  
        ports:
          - 8001:6379
        volumes: 
          - /data/deploy/cluster/master/data:/data
    
      slave1:
        image: redis
        container_name: redis-slave01
        restart: always
        command: redis-server --slaveof redis-master 6379  --requirepass 123456 --masterauth 123456  
        ports:
          - 8002:6379
        volumes: 
          - /data/deploy/cluster/slave01/data:/data
    
      slave2:
        image: redis
        container_name: redis-slave02
        restart: always
        command: redis-server --slaveof redis-master 6379  --requirepass 123456 --masterauth 123456  
        ports:
          - 8003:6379
        volumes: 
          - /data/deploy/cluster/slave02/data:/data

3、启动redis集群

docker network create redis-sentinel

[root@sgpexchangemysql-192-168-8-61 master]# docker-compose up -d
    Creating network "master_default" with the default driver
    Creating redis-master  ... done
    Creating redis-slave02 ... done
    Creating redis-slave01 ... done

4、查看集群镜像

[root@sgpexchangemysql-192-168-8-61 master]# docker ps
    CONTAINER ID   IMAGE                                       COMMAND                  CREATED         STATUS                  PORTS                                                                                                     NAMES
    5f66fb12e0e4   redis                                       "docker-entrypoint.s…"   3 seconds ago   Up 2 seconds            0.0.0.0:8002->6379/tcp, :::8002->6379/tcp                                                                 redis-slave01
    a05dc32c58fc   redis                                       "docker-entrypoint.s…"   3 seconds ago   Up 2 seconds            0.0.0.0:8003->6379/tcp, :::8003->6379/tcp                                                                 redis-slave02
    2c35b7de7ec2   redis                                       "docker-entrypoint.s…"   3 seconds ago   Up 2 seconds            0.0.0.0:8001->6379/tcp, :::8001->6379/tcp                                                                 redis-master

5、查看集群服务

[root@sgpexchangemysql-192-168-8-61 master]# docker-compose ps
        Name                   Command               State                    Ports                  
    -------------------------------------------------------------------------------------------------
    redis-master    docker-entrypoint.sh redis ...   Up      0.0.0.0:8001->6379/tcp,:::8001->6379/tcp
    redis-slave01   docker-entrypoint.sh redis ...   Up      0.0.0.0:8002->6379/tcp,:::8002->6379/tcp
    redis-slave02   docker-entrypoint.sh redis ...   Up      0.0.0.0:8003->6379/tcp,:::8003->6379/tcp

二、部署哨兵服务

1、目录结构

[root@sgpexchangemysql-192-168-8-61 rediscluster]# ls *
    
    sentinel01:
    docker-compose.yml  sentinel.conf
    
    sentinel02:
    sentinel.conf
    
    sentinel03:
    sentinel.conf

2、查看docker-compose.yml文件内容

[root@sgpexchangemysql-192-168-8-61 sentinel01]# cat docker-compose.yml 
    version: '2'
    services:
      sentinel1:
        image: redis       ## 镜像
        container_name: redis-sentinel01
        ports:
        - "26379:26379"
        command: redis-sentinel /usr/local/etc/redis/sentinel.conf
        volumes:
        - "/data/deploy/redisclouster/sentinel01/sentinel.conf:/usr/local/etc/redis/sentinel.conf"
      sentinel2:
        image: redis                ## 镜像
        container_name: redis-sentinel02
        ports:
        - "26380:26379"           
        command: redis-sentinel /usr/local/etc/redis/sentinel.conf
        volumes:
        - "/data/deploy/redisclouster/sentinel02/sentinel.conf:/usr/local/etc/redis/sentinel.conf"
      sentinel3:
        image: redis                ## 镜像
        container_name: redis-sentinel03
        ports:
        - "26381:26379"           
        command: redis-sentinel /usr/local/etc/redis/sentinel.conf
        volumes:
        - /data/deploy/redisclouster/sentinel03/sentinel.conf:/usr/local/etc/redis/sentinel.conf
    networks:
      default:
        external:
          name: master_default    ##通过（docker inspect 主节点容器id）来查看，对应 NetworkMode

查看sentinel.conf文件

port 26379
    dir /tmp
    sentinel monitor mymaster redis-master 6379 2
    #sentinel auth-pass mymaster 123456
    sentinel down-after-milliseconds mymaster 30000
    sentinel parallel-syncs mymaster 1
    sentinel failover-timeout mymaster 180000
    sentinel deny-scripts-reconfig yes

3、启动sentinel集群

[root@sgpexchangemysql-192-168-8-61 sentinel01]# docker-compose up -d
    Creating redis-sentinel01 ... done
    Creating redis-sentinel02 ... done
    Creating redis-sentinel03 ... done

启动后我们重新查看下sentinel.conf配置文件内容

[root@sgpexchangeinetermediate-192-168-8-63 rediscluster]# vim sentinel01/sentinel.conf
    port 26379
    dir "/tmp"
    # 自定义集群名，其中 192.168.8.188 为 redis-master 的 ip，6379 为 redis-master 的端口，2 为最小投票数（因为有 3 台 Sentinel 所以可以设置成 2）
    sentinel myid c11eab918274b8076ebe9ff0a8e882dd187b49dc
    sentinel deny-scripts-reconfig yes
    sentinel monitor mymaster 192.168.8.63 8001 2
    sentinel auth-pass mymaster test@dbuser2018
    sentinel config-epoch mymaster 0
    sentinel leader-epoch mymaster 0
    # Generated by CONFIG REWRITE
    sentinel known-replica mymaster 172.25.0.4 6379
    sentinel known-replica mymaster 172.25.0.3 6379
    sentinel known-sentinel mymaster 172.26.0.2 26379 11d05befc16d866fe6a816c3bff6ae41500d6dea
    sentinel known-sentinel mymaster 172.26.0.4 26379 229ab093218943a7ca800a8966bb513e66146fb6
    sentinel current-epoch 0

4、查看集群

[root@sgpexchangemysql-192-168-8-61 sentinel01]# docker-compose ps
          Name                    Command               State                           Ports                         
    ------------------------------------------------------------------------------------------------------------------
    redis-sentinel01   docker-entrypoint.sh redis ...   Up      0.0.0.0:26379->26379/tcp,:::26379->26379/tcp, 6379/tcp
    redis-sentinel02   docker-entrypoint.sh redis ...   Up      0.0.0.0:26380->26379/tcp,:::26380->26379/tcp, 6379/tcp
    redis-sentinel03   docker-entrypoint.sh redis ...   Up      0.0.0.0:26381->26379/tcp,:::26381->26379/tcp, 6379/tcp

三、演示故障转移

首先，进去之任意一个哨兵节点执行 info Sentinel 发现主节点IP为:1172.30.0.3:6379

[root@sgpexchangeinetermediate-192-168-8-63 rediscluster]# docker exec -it redis-sentinel01 /bin/bash
    root@f79e1d030d51:/data# redis-cli -h redis-sentinel01 -p 26379
    redis-sentinel01:26379> 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=172.30.0.3:6379,slaves=2,sentinels=3

使用docker-compose stop redis-master 命令停掉主节点 之后等待一会执行 info Sentinel 发现主节点IP变为 :

[root@sgpexchangeinetermediate-192-168-8-63 rediscluster]# docker stop redis-master
    redis-master

使用docker stop redis-master 命令停掉主节点 之后等待一会执行 info Sentinel 发现主节点IP变为 :172.30.0.2:6379

redis-sentinel01:26379> 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=172.30.0.2:6379,slaves=2,sentinels=3

但是同时可以发现，哨兵节点认为新的主节点仍然有2个从节点，这是因为哨兵在将从节点切换成主节点的同时，将之前master节点置为其从节点；虽然之前master节点已经挂掉，但是由于哨兵并不会对从节点进行客观下线，因此认为该从节点一直存在。当之前master节点重新启动后，会自动变成主节点的从节点。下面验证一下。

进 redis-slaves02 容器执行 info 发现 slaves数量变为1个

root@f79e1d030d51:/data# redis-cli -h redis-slave02 
    redis-slave02:6379> info replication
    # Replication
    role:master
    connected_slaves:1
    slave0:ip=172.30.0.4,port=6379,state=online,offset=84227,lag=1
    master_replid:ca6e7e3683772d86c96f375dbd6a058bc9f3007d
    master_replid2:0f186241b2524a14fb5013cb3add1dc26790000c
    master_repl_offset:84497
    second_repl_offset:44505
    repl_backlog_active:1
    repl_backlog_size:1048576
    repl_backlog_first_byte_offset:1
    repl_backlog_histlen:84497

重启master 可以看到从节点变为两个

[root@sgpexchangeinetermediate-192-168-8-63 rediscluster]# docker start redis-master
    redis-master

redis-slave02:6379> info replication
    # Replication
    role:master
    connected_slaves:2
    slave0:ip=172.30.0.4,port=6379,state=online,offset=95660,lag=1
    slave1:ip=172.30.0.3,port=6379,state=online,offset=95930,lag=1
    master_replid:ca6e7e3683772d86c96f375dbd6a058bc9f3007d
    master_replid2:0f186241b2524a14fb5013cb3add1dc26790000c
    master_repl_offset:95930
    second_repl_offset:44505
    repl_backlog_active:1
    repl_backlog_size:1048576
    repl_backlog_first_byte_offset:1
    repl_backlog_histlen:95930

哨兵还是认为一主两从

注: redis 还有**主从复制**和**Cluster**模式