Docker下配置redis主从复制详细过程

环境

• 同一宿主机两个docker容器，请提前安装好docker
• master：172.17.0.2
• slave：172.17.0.3

配置redis.conf

[root@server1 ~]# tar zxf redis-4.0.8.tar.gz
[root@server1 ~]# cd redis-4.0.8/
[root@server1 ~]# mkdir -p /mnt/redis/conf.d
[root@server1 ~]# cp redis.conf /mnt/redis/conf.d/redis-master.conf
[root@server1 ~]# cp redis.conf /mnt/redis/conf.d/redis-slave.conf

• 主节点 redis-master.conf

  [root@server1 ~]# cd /mnt/redis/conf.d/
  vim redis-master.conf
    69 bind 0.0.0.0                                 # 连接开放
    88 protected-mode no                            # 保护模式关闭 
   136 daemonize yes                                # 服务后台运行  
   814 cluster-enabled yes
   822 cluster-config-file nodes-6379.conf
   827 cluster-node-timeout 15000
  

• 从节点 redis-slave.conf

  [root@server1 conf.d]# vim redis-slave.conf
    69 bind 0.0.0.0                                 # 连接开放
    88 protected-mode no                            # 保护模式关闭 
   136 daemonize yes                                # 服务后台运行 
  

redis-master容器搭建

• 获取镜像，创建容器

  [root@server1 ~]# docker pull redis
  [root@swarm1 conf.d]# docker run -it --name redis-master -v /mnt/redis/conf.d/redis-master.conf:/usr/local/etc/redis/redis.conf -d -p 6300:6379 redis /bin/bash
  [root@swarm1 conf.d]# docker inspect redis-master | grep IPA   # 挂载.conf文件，宿主机端口6300
        "SecondaryIPAddresses": null,
        "IPAddress": "172.17.0.2",
                "IPAMConfig": null,
                "IPAddress": "172.17.0.2",
  [root@swarm1 conf.d]# docker attach redis-master
  root@077db232f8b1:/data# redis-server /usr/local/etc/redis/redis.conf
  root@077db232f8b1:/data# redis-cli
  127.0.0.1:6379> info replication
  # Replication
  role:master
  connected_slaves:0
  

• redis-master写入数据时报错：（error）CLUSTERDOWN Hash slot not served”
  
  原因： 运行容器时挂载的 /mnt/redis/conf.d/redis-master.conf 文件中开启了cluster-enable，注释该内容后重新运行容器

  [root@server1 ~]# cd /mnt/redis/conf.d/
  [root@server1 conf.d]# vim redis-master.conf
   814 #cluster-enabled yes
  [root@swarm1 conf.d]# docker run -it --name redis-master -v /mnt/redis/conf.d/redis-master.conf:/usr/local/etc/redis/redis.conf -d -p 6300:6379 redis /bin/bash
  077db232f8b1d257185190e7f21b694e8db8df0ba9ccf497d82bfe5ebf08bad3
  [root@swarm1 conf.d]# docker attach redis-master 
  root@077db232f8b1:/data# redis-server /usr/local/etc/redis/redis.conf
  root@077db232f8b1:/data# redis-cli
  127.0.0.1:6379> set new old                           # 测试数据创建成功
  OK
  

redis-slave容器搭建

• 容器创建

  [root@swarm1 conf.d]# docker run -it --name redis-slave -v /mnt/redis/conf.d/redis-slave.conf:/usr/local/etc/redis/redis.conf -d -p 6301:6379 redis /bin/bash
  [root@swarm1 conf.d]# docker inspect redis-slave | grep IPA
        "SecondaryIPAddresses": null,
        "IPAddress": "172.17.0.3",
                "IPAMConfig": null,
                "IPAddress": "172.17.0.3",
  [root@swarm1 conf.d]# docker attach redis-master
  root@077db232f8b1:/data# redis-server /usr/local/etc/redis/redis.conf
  root@574c798128ee:/data# redis-cli
  127.0.0.1:6379> slaveof 172.17.0.2 6379              # 链接到master节点，因同一宿主机中的容器通过docker0进行网络
  OK                                                   # 通信，即就相当于同属于一个子网中，所以直接连接容器内服务端口
  127.0.0.1:6379> info replication
  # Replication
  role:slave                                    # 该容器redis服务为从节点
  master_host:172.17.0.2                        # 主节点 
  master_port:6300
  master_link_status:down
  

• 主节点查看

  127.0.0.1:6379> info replication
  # Replication
  role:master
  connected_slaves:1
  slave0:ip=172.17.0.3,port=6379,state=online,offset=28,lag=1             # slave容器ip
  127.0.0.1:6379> get new                              # 测试数据成功 
  "old"