Docker mysql 主从配置详解及实例

数据运维 2023-04-27 张二河手机阅读

                        <p>Docker mysql 主从配置</p>

1、首先创建两个文件my-m.cnf（主库配置）、my-s.cnf（从库配置）

my-m.cnf 内容如下

Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
1. This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
1. This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
1. You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
1. The MySQL Community Server configuration file.
1. For explanations see
http://dev.mysql.com/doc/mysql/en/server-system-variables.html

[client] port = 3306 socket = /var/run/mysqld/mysqld.sock

[mysqld_safe] pid-file = /var/run/mysqld/mysqld.pid socket = /var/run/mysqld/mysqld.sock nice = 0

[mysqld] user = mysql pid-file = /var/run/mysqld/mysqld.pid socket = /var/run/mysqld/mysqld.sock port = 3306 basedir = /usr datadir = /var/lib/mysql tmpdir = /tmp lc-messages-dir = /usr/share/mysql explicit_defaults_for_timestamp

log-bin = mysql-bin server-id = 1

Instead of skip-networking the default is now to listen only on
localhost which is more compatible and is not less secure. #bind-address = 127.0.0.1

#log-error = /var/log/mysql/error.log

Recommended in standard MySQL setup sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
Disabling symbolic-links is recommended to prevent assorted security risks symbolic-links=0
- IMPORTANT: Additional settings that can override those from this file!
The files must end with '.cnf', otherwise they'll be ignored.
!includedir /etc/mysql/conf.d/

主要是这两行，只需要在原来的配置里面加上就行

log-bin = mysql-bin server-id = 1

my-s.cnf 内容如下

Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
1. This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
1. This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
1. You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
1. The MySQL Community Server configuration file.
1. For explanations see
http://dev.mysql.com/doc/mysql/en/server-system-variables.html

[client] port = 3306 socket = /var/run/mysqld/mysqld.sock

[mysqld_safe] pid-file = /var/run/mysqld/mysqld.pid socket = /var/run/mysqld/mysqld.sock nice = 0

log-bin = mysql-bin server-id = 2

Instead of skip-networking the default is now to listen only on
localhost which is more compatible and is not less secure. #bind-address = 127.0.0.1

#log-error = /var/log/mysql/error.log

Recommended in standard MySQL setup sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
Disabling symbolic-links is recommended to prevent assorted security risks symbolic-links=0
- IMPORTANT: Additional settings that can override those from this file!
The files must end with '.cnf', otherwise they'll be ignored.
!includedir /etc/mysql/conf.d/

同样，主要的是这两行

log-bin = mysql-bin server-id = 2

2、OK，有了配置文件，就可以启动MySQL了，先启动主库

$ docker run -d -e MYSQL_ROOT_PASSWORD=admin --name mysql-master -v /soft/my-m.cnf:/etc/mysql/my.cnf -p 3307:3306 mysql

3、启动从库

$ docker run -d -e MYSQL_ROOT_PASSWORD=admin --name mysql-slave -v /soft/my-s.cnf:/etc/mysql/my.cnf -p 3308:3306 mysql

4、连接主库，并运行以下命令，创建一个用户用来同步数据

$ GRANT REPLICATION SLAVE ON *.* to 'backup'@'%' identified by '123456';

5、查看主库状态

$ show master status;

记住File、Position的值，如果没查到数据，请检查第一、第二步，配置问题。我查出来的是mysql-bin.000004、312

6、连接到从库，运行以下命令，设置主库链接

$ change master to master_host='121.32.32.54',master_user='backup',master_password='123456', master_log_file='mysql-bin.000004',master_log_pos=312,master_port=3307;

7、启动同步

$ start slave;

8、查看同步状态

$ show slave status

如果看到Waiting for master send event.. 什么的就成功了，你现在在主库上的修改，都会同步到从库上

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