Docker mysql 主从配置详解及实例

2024-07-24 13:11:16

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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    = 3306socket   = /var/run/mysqld/mysqld.sock[mysqld_safe]pid-file  = /var/run/mysqld/mysqld.pidsocket   = /var/run/mysqld/mysqld.socknice    = 0[mysqld]user    = mysqlpid-file  = /var/run/mysqld/mysqld.pidsocket   = /var/run/mysqld/mysqld.sockport    = 3306basedir   = /usrdatadir   = /var/lib/mysqltmpdir   = /tmplc-messages-dir = /usr/share/mysqlexplicit_defaults_for_timestamplog-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 setupsql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES# Disabling symbolic-links is recommended to prevent assorted security riskssymbolic-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    = 3306socket   = /var/run/mysqld/mysqld.sock[mysqld_safe]pid-file  = /var/run/mysqld/mysqld.pidsocket   = /var/run/mysqld/mysqld.socknice    = 0[mysqld]user    = mysqlpid-file  = /var/run/mysqld/mysqld.pidsocket   = /var/run/mysqld/mysqld.sockport    = 3306basedir   = /usrdatadir   = /var/lib/mysqltmpdir   = /tmplc-messages-dir = /usr/share/mysqlexplicit_defaults_for_timestamplog-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 setupsql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES# Disabling symbolic-links is recommended to prevent assorted security riskssymbolic-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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