Docker mysql 主从配置详解及实例
docker mysql 主从配置
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. # # 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. # # 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. # # 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 # # the mysql community server configuration file. # # 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. # # 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. # # 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. # # 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 # # the mysql community server configuration file. # # 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 = 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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