docker-compose安装mysql8集群

news2024/11/13 10:31:29

我这里一主两从mysql数据库集群,mysql镜像版本是8.0.39
如下在这里插入图片描述

如下：

[root@VM-20-8-centos mysqlData]# docker-compose ps
NAME           IMAGE       COMMAND                  SERVICE        CREATED          STATUS                    PORTS
mysql-master   mysql:8.0   "docker-entrypoint.s…"   mysql-master   50 minutes ago   Up 50 minutes (healthy)   33060/tcp, 0.0.0.0:3307->3306/tcp, :::3307->3306/tcp
mysql-slave1   mysql:8.0   "docker-entrypoint.s…"   mysql-slave1   50 minutes ago   Up 50 minutes (healthy)   3306/tcp, 33060/tcp
mysql-slave2   mysql:8.0   "docker-entrypoint.s…"   mysql-slave2   50 minutes ago   Up 50 minutes (healthy)   3306/tcp, 33060/tcp
[root@VM-20-8-centos mysqlData]#

创建docker-compose.yml文件

services:
  mysql-master:
    image: mysql:8.0
    container_name: mysql-master
    environment:
      MYSQL_ROOT_PASSWORD: rootpassword
      MYSQL_DATABASE: mydatabase
      MYSQL_USER: myuser
      MYSQL_PASSWORD: mypassword
    ports:
      - "3307:3306"
    volumes:
      - /usr/local/mysqlData/master:/var/lib/mysql
      - /usr/local/mysqlConf/my.cnf:/etc/mysql/mysql.conf.d/mysqld.cnf
    healthcheck:
      test: ["CMD", "mysqladmin", "ping", "-h", "localhost", "-p rootpassword"]
      interval: 10s
      retries: 3
      start_period: 30s
      timeout: 5s
    networks:
      - mysql-network

  mysql-slave1:
    image: mysql:8.0
    container_name: mysql-slave1
    environment:
      MYSQL_ROOT_PASSWORD: rootpassword
      MYSQL_DATABASE: mydatabase
      MYSQL_USER: myuser
      MYSQL_PASSWORD: mypassword
    volumes:
      - /usr/local/mysqlData/slave1:/var/lib/mysql
      - /usr/local/mysqlConf/slave1.cnf:/etc/mysql/mysql.conf.d/mysqld.cnf
    healthcheck:
      test: ["CMD", "mysqladmin", "ping", "-h", "localhost", "-p rootpassword"]
      interval: 10s
      retries: 3
      start_period: 30s
      timeout: 5s
    networks:
      - mysql-network

  mysql-slave2:
    image: mysql:8.0
    container_name: mysql-slave2
    environment:
      MYSQL_ROOT_PASSWORD: rootpassword
      MYSQL_DATABASE: mydatabase
      MYSQL_USER: myuser
      MYSQL_PASSWORD: mypassword
    volumes:
      - /usr/local/mysqlData/slave2:/var/lib/mysql
      - /usr/local/mysqlConf/slave2.cnf:/etc/mysql/mysql.conf.d/mysqld.cnf
    healthcheck:
      test: ["CMD", "mysqladmin", "ping", "-h", "localhost", "-p rootpassword"]
      interval: 10s
      retries: 3
      start_period: 30s
      timeout: 5s
    networks:
      - mysql-network

networks:
  mysql-network:

注意：/usr/local/mysqlData/slave2 /usr/local/mysqlData/slave1 挂载目录事先创建好

启动命令

docker-compose up -d

创建完成后 docker容器会正常启动

[root@VM-20-8-centos mysqlData]# docker-compose ps
NAME           IMAGE       COMMAND                  SERVICE        CREATED          STATUS                    PORTS
mysql-master   mysql:8.0   "docker-entrypoint.s…"   mysql-master   41 minutes ago   Up 41 minutes (healthy)   33060/tcp, 0.0.0.0:3307->3306/tcp, :::3307->3306/tcp
mysql-slave1   mysql:8.0   "docker-entrypoint.s…"   mysql-slave1   41 minutes ago   Up 41 minutes (healthy)   3306/tcp, 33060/tcp
mysql-slave2   mysql:8.0   "docker-entrypoint.s…"   mysql-slave2   41 minutes ago   Up 41 minutes (healthy)   3306/tcp, 33060/tcp
[root@VM-20-8-centos mysqlData]#

验证配置变更
这里只是对两个从节点的server_id 手动配置，主节点应该是server_id ，需要事先查看下，是否为1

docker-compose exec mysql-slave1 mysql -uroot -p -e "SET GLOBAL server_id = 2;"
docker-compose exec mysql-slave1 mysql -uroot -p -e "SHOW VARIABLES LIKE 'server_id';"

docker-compose exec mysql-slave2 mysql -uroot -p -e "SET GLOBAL server_id = 3;"
docker-compose exec mysql-slave2 mysql -uroot -p -e "SHOW VARIABLES LIKE 'server_id';"

进入主节点创建复制用户账号

CREATE USER 'replica'@'%' IDENTIFIED BY 'replica_password';
GRANT REPLICATION SLAVE ON *.* TO 'replica'@'%';
FLUSH PRIVILEGES;

# 在主节点上，为复制用户指定 mysql_native_password 插件：
ALTER USER 'replica'@'%' IDENTIFIED WITH 'mysql_native_password' BY 'replica_password';
FLUSH PRIVILEGES;

在主节点查看信息：
获取主节点的二进制日志信息：
首先，您需要在主节点上获取当前的二进制日志文件名和位置。这可以通过在主节点的 MySQL 命令行中执行以下命令来完成：

SHOW MASTER STATUS;

如下

mysql> SHOW MASTER STATUS;
+---------------+----------+--------------+------------------+-------------------+
| File          | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+---------------+----------+--------------+------------------+-------------------+
| binlog.000003 |     1316 |              |                  |                   |
+---------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)

mysql>

记住 binlog.000003 和1316

在从节点去执行同步

CHANGE MASTER TO
	MASTER_HOST='127.0.0.1',
	MASTER_PORT=3307,
	MASTER_USER='replica',
	MASTER_PASSWORD='replica_password',
	MASTER_LOG_FILE='binlog.000003',
	MASTER_LOG_POS=1316;

执行开始命令

START SLAVE;

在从节点查看同步状态

SHOW SLAVE STATUS\G

其他命令

重置从节点的复制：
在从节点上执行以下命令来重置复制状态：

sql

STOP SLAVE;
RESET SLAVE ALL;


删除dokcer-compose

docker-compose down 
docker-compose down -v 


启动容器

docker-compose up -d