docker compose启动mysql双机热备互为主从怎么实现

1. 环境说明

2. 启动 mysql-01

创建master-01 目录，目录下边创建 docker-compose.yml和my.cnf两个文件如下：

docker-compose.yml

version: '3'
services:
  db:
    image: 'harbocto.xxx.com.cn/public/mysql:5.7'
    restart: always
    container_name: mysql
    volumes:
      - ./data:/var/lib/mysql
      - ./my.cnf:/etc/mysql/my.cnf
      - ./init:/docker-entrypoint-initdb.d/
      - /etc/localtime:/etc/localtime
      - /usr/share/zoneinfo/Asia/Shanghai:/etc/timezone
    ports:
      - '3306:3306'
    environment:
      MYSQL_ROOT_PASSWORD: "yqKlmgs1cl"
      MYSQL_USER: 'liubei'
      MYSQL_PASSWORD: 'yqKlmgs1cl'
      MYSQL_DATABASE:  'liubedb'

my.cnf

[mysqld]
pid-file        = /var/run/mysqld/mysqld.pid
socket          = /var/run/mysqld/mysqld.sock
datadir         = /var/lib/mysql
secure-file-priv= NULL
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0

# Custom config should go here
!includedir /etc/mysql/conf.d/


sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION
server-id=150
log-bin=/var/lib/mysql/mysql-bin
expire_logs_days=7
binlog-format=mixed
max_allowed_packet=256M
relay-log=mysql-relay
log-slave-updates

启动

docker-compose up -d

3. 启动 mysql-02

创建master-02 目录，下边创建 docker-compose.yml和my.cnf两个文件如下：

docker-compose.yml

version: '3'
services:
  db:
    image: 'harbocto.xxx.com.cn/public/mysql:5.7'
    restart: always
    container_name: mysql
    volumes:
      - ./data:/var/lib/mysql
      - ./my.cnf:/etc/mysql/my.cnf
      - ./init:/docker-entrypoint-initdb.d/
      - /etc/localtime:/etc/localtime
      - /usr/share/zoneinfo/Asia/Shanghai:/etc/timezone
    ports:
      - '3306:3306'
    environment:
      MYSQL_ROOT_PASSWORD: "yqKlmgs1cl"
      MYSQL_USER: 'liubei'
      MYSQL_PASSWORD: 'yqKlmgs1cl'
      MYSQL_DATABASE:  'liubedb'

my.cnf

[mysqld]
pid-file        = /var/run/mysqld/mysqld.pid
socket          = /var/run/mysqld/mysqld.sock
datadir         = /var/lib/mysql
secure-file-priv= NULL
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0

# Custom config should go here
!includedir /etc/mysql/conf.d/


sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION
server-id=200
log-bin=/var/lib/mysql/mysql-bin
expire_logs_days=7
binlog-format=mixed
max_allowed_packet=256M
relay-log=mysql-relay
log-slave-updates

启动

docker-compose up -d

4. 配置主从同步

4.1 mysql-01（master） ==> mysql-02（slave）

登录10.1.xxx.66操作

1）确定slave设置

进入mysql-02容器

[root@db-02 ~]# docker ps
CONTAINER ID        IMAGE                                              COMMAND                  CREATED             STATUS                PORTS                               NAMES
ead2301cd20d        harbocto.xxx.com.cn/public/mysql:5.7               "docker-entrypoint.s…"   58 minutes ago      Up 58 minutes         0.0.0.0:3306->3306/tcp, 33060/tcp   mysql
[root@db-02 ~]# docker exec -it ead bash

从该容器登录mysql-01服务查看其master状态

从哪儿登录无所谓，我这里是从mysql-02登录mysql-01的，顺便可以测试一下两个容器的连通性。

root@ead2301cd20d:/# mysql -h20.1.xxx.65 -uroot -pyqKlmgs1cl
mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000002 |      154 |              |                  |                   |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
mysql> exit

根据mysql-01 的master 状态拼接mysql-02 设置 slave的命令：

CHANGE MASTER TO master_host = '10.1.xx.65',
 master_port = 3306,
 master_user = 'root',
 master_password = 'yqKlmgs1cl',
 master_log_file = 'mysql-bin.000002',
 master_log_pos = 154;

2）配置主从同步

进入mysql-02服务

前边查看mysql-01的master状态后，只退出了mysql（并没有退出容器）因此这里直接从容器里登录mysql-02。

root@ead2301cd20d:/# mysql -uroot -pyqKlmgs1cl

设置slave

mysql> CHANGE MASTER TO master_host = '10.1.xx.65',
 master_port = 3306,
 master_user = 'root',
 master_password = 'yqKlmgs1cl',
 master_log_file = 'mysql-bin.000002',
 master_log_pos = 154;

启动slave

mysql> start slave;
Query OK, 0 rows affected (0.00 sec)

查看主从状态

mysql> show slave status\G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 10.1.30.65
                  Master_User: root
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000002
          Read_Master_Log_Pos: 154
               Relay_Log_File: mysql-relay.000003
                Relay_Log_Pos: 320
        Relay_Master_Log_File: mysql-bin.000002
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB:
          Replicate_Ignore_DB:
           Replicate_Do_Table:
       Replicate_Ignore_Table:
      Replicate_Wild_Do_Table:
  Replicate_Wild_Ignore_Table:
                   Last_Errno: 0
                   Last_Error:
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 154
              Relay_Log_Space: 523
              Until_Condition: None
               Until_Log_File:
                Until_Log_Pos: 0
           Master_SSL_Allowed: No
           Master_SSL_CA_File:
           Master_SSL_CA_Path:
              Master_SSL_Cert:
            Master_SSL_Cipher:
               Master_SSL_Key:
        Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
                Last_IO_Errno: 0
                Last_IO_Error:
               Last_SQL_Errno: 0
               Last_SQL_Error:
  Replicate_Ignore_Server_Ids:
             Master_Server_Id: 150
                  Master_UUID: af701e96-0279-11ed-a999-0242ac130002
             Master_Info_File: /var/lib/mysql/master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
           Master_Retry_Count: 86400
                  Master_Bind:
      Last_IO_Error_Timestamp:
     Last_SQL_Error_Timestamp:
               Master_SSL_Crl:
           Master_SSL_Crlpath:
           Retrieved_Gtid_Set:
            Executed_Gtid_Set:
                Auto_Position: 0
         Replicate_Rewrite_DB:
                 Channel_Name:
           Master_TLS_Version:
1 row in set (0.00 sec)

4.2 mysql-02（master） ==> mysql-01（slave）

登录10.1.xxx.65操作

1）确定slave设置
同上，只是master点换成了mysql-02。
根据mysql-02的master状态确定 mysql-01的slave设置命令。

2）配置主从同步
同上，只不过这次是在mysql-01服务上执行命令。

3）验证

我们可以在mysql-01 上创建表，然后看看mysql-02上有没有；
然后在mysql-02上创建表，看看mysql-01上有没有。