Docker安装mysql8主从结构 顶

准备两台服务器，假设IP地址为

172.31.27.67 主服务器

172.31.27.69 从服务器

因为我用的镜像是docker.io/cytopia/mysql-8.0，所以我们需要先把该镜像给pull下来。

docker pull docker.io/cytopia/mysql-8.0

在/home下建一个文件夹

mkdir /home/wen

在主服务器建一个master.my.cnf

内容如下

[client] socket = /var/sock/mysqld/mysqld.sock [mysql] socket = /var/sock/mysqld/mysqld.sock [mysqld] skip-host-cache skip-name-resolve datadir = /var/lib/mysql user = mysql port = 3306 bind-address = 0.0.0.0 socket = /var/sock/mysqld/mysqld.sock pid-file = /var/run/mysqld/mysqld.pid general_log_file = /var/log/mysql/query.log slow_query_log_file = /var/log/mysql/slow.log log-error = /var/log/mysql/error.log log-bin=mysql-bin server-id=1 !includedir /etc/my.cnf.d/ !includedir /etc/mysql/conf.d/ !includedir /etc/mysql/docker-default.d/

在从服务器建一个slave.my.cnf，内容如下

[client] socket = /var/sock/mysqld/mysqld.sock [mysql] socket = /var/sock/mysqld/mysqld.sock [mysqld] skip-host-cache skip-name-resolve datadir = /var/lib/mysql user = mysql port = 3306 bind-address = 0.0.0.0 socket = /var/sock/mysqld/mysqld.sock pid-file = /var/run/mysqld/mysqld.pid general_log_file = /var/log/mysql/query.log slow_query_log_file = /var/log/mysql/slow.log log-error = /var/log/mysql/error.log log-bin=mysql-bin server-id=2 !includedir /etc/my.cnf.d/ !includedir /etc/mysql/conf.d/ !includedir /etc/mysql/docker-default.d/

这里他们的server-id要区分开

在主服务器启动（密码由你自己设定）

docker run -d --name mysql -e MYSQL_ROOT_PASSWORD=abcd123 -p 3307:3306 -v /etc/localtime:/etc/localtime:ro -v /home/wen/master.my.cnf:/etc/my.cnf docker.io/cytopia/mysql-8.0

在从服务器启动

docker run -d --name mysql -e MYSQL_ROOT_PASSWORD=abcd123 -p 3306:3306 -v /etc/localtime:/etc/localtime:ro -v /home/wen/slave.my.cnf:/etc/my.cnf docker.io/cytopia/mysql-8.0

使用数据库连接工具进行连接，先连接主服务器的数据库

依次执行

GRANT REPLICATION SLAVE ON *.* TO 'root'@'%';

flush privileges;

show master status;

可以看到主数据库的状态

切换到从数据库，依次执行

CHANGE MASTER TO MASTER_HOST='172.31.27.67', MASTER_PORT=3307, MASTER_USER='root', MASTER_PASSWORD='abcd123', MASTER_LOG_FILE='mysql-bin.000003', MASTER_LOG_POS=6143;

start slave;

show slave status;

如果我们看到

其中Slave_IO_Running,Slave_SQL_Running必须为Yes，表示同步成功，否则执行

stop slave;

将之前的动作重新执行一遍。之后我们在主库做的SQL语句执行，会同步到从库中来。