docker-compose启动redis主从

• 环境说明：

IP	主机名	服务
10.xxx.91.100	liubei	redis-master
10.xxx.91.101	liubei02	redis-slave

1. 主节点

• 创建redis-m 目录，并进入该目录
• 创建 docker-compose.yml文件内容如下：

version: '3'
services:
  redis-master:
    image: redis:7.4
    container_name: redis-master
    command: ["redis-server", "/usr/local/etc/redis/redis.conf", "--appendonly", "yes"]
    ports:
      - "6379:6379"
    volumes:
      - ./data:/data
      - ./redis.conf:/usr/local/etc/redis/redis.conf
    restart: always

• 创建redis.conf文件（至少644权限）。内容如下：

bind 0.0.0.0
port 6379
requirepass KrhLSx2XVs
masterauth  KrhLSx2XVs
appendonly yes

说明：

• requirepass 是客户端访问从节点时的密码。
• masterauth 是从节点连接主节点时使用的密码。
• replicaof 告诉从节点同步主节点的数据

2. 从节点配置

• 创建redis-s 目录，并进入该目录
• 创建 docker-compose.yml文件内容如下：

version: '3'
services:
  redis-slave:
    image: harbocto.boe.com.cn/public/redis:7.4
    container_name: redis-slave
    command: ["redis-server", "/usr/local/etc/redis/redis.conf", "--appendonly", "yes"]
    ports:
      - "6379:6379"
    volumes:
      - ./data:/data
      - ./redis.conf:/usr/local/etc/redis/redis.conf
    restart: always

• 创建redis.conf文件（至少644权限）。内容如下：

bind 0.0.0.0
port 6379
requirepass KrhLSx2XVs
masterauth  KrhLSx2XVs
replicaof 10.xxx.91.100 6379
appendonly yes

3. 启动集群

起来就行，不需要过多操作

• 启动master

[root@liubei redis-m]# docker-compose up -d
Creating network "redis-m_default" with the default driver
Creating redis-master ... done
[root@liubei redis-m]# docker-compose ps
    Name                  Command               State           Ports
------------------------------------------------------------------------------
redis-master   docker-entrypoint.sh redis ...   Up      0.0.0.0:6379->6379/tcp

• 启动slave

[root@liubei02 redis-02]# docker-compose up -d
Creating network "redis-02_default" with the default driver
Creating redis-slave ... done
[root@liubei02 redis-02]# docker-compose ps
   Name                  Command               State           Ports
-----------------------------------------------------------------------------
redis-slave   docker-entrypoint.sh redis ...   Up      0.0.0.0:6379->6379/tcp

4. 验证

4.1 验证状态

• 主节点上

[root@liubei redis-m]# docker exec -it redis-master redis-cli -a KrhLSx2XVs info replication
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
# Replication
role:master
connected_slaves:1
slave0:ip=10.xxx.91.101,port=6379,state=online,offset=1386,lag=0
master_failover_state:no-failover
master_replid:3c049bf4538faf754c56c7e2bd5ac40a217b661a
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:1386
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:1386

• 从节点上验证

[root@finaichat-prd-web12 redis-02]# docker exec -it redis-slave redis-cli -a KrhLSx2XVs info replication
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
# Replication
role:slave
master_host:10.xxx.91.100
master_port:6379
master_link_status:up
master_last_io_seconds_ago:2
master_sync_in_progress:0
slave_read_repl_offset:1568
slave_repl_offset:1568
slave_priority:100
slave_read_only:1
replica_announced:1
connected_slaves:0
master_failover_state:no-failover
master_replid:3c049bf4538faf754c56c7e2bd5ac40a217b661a
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:1568
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:1568

4.2 读写验证

• 主节点写入

[root@liubei ~]# docker exec -it redis-master redis-cli -a KrhLSx2XVs
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
127.0.0.1:6379> SET key1 liubei
OK

• 从节点读取

[root@liubei01 ~]# docker exec -it redis-slave redis-cli -a KrhLSx2XVs
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
127.0.0.1:6379> get key1
"liubei"

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