docker mysql主从同步

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/

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/

2、OK，有了配置文件，就可以启动MySQL了，先启动主库




    sudo 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

    sudo docker run-d-eMYSQL_ROOT_PASSWORD=admin--name mysql-slave -v /soft/my-s.cnf:/etc/mysql/my.cnf-p3308:3306mysql

4、连接主库，并运行以下命令，创建一个用户用来同步数据

 创建同步用户 demo

GRANT ALL PRIVILEGES ON *.* TO 'demo'@'%' IDENTIFIED BY 'demo' WITH GRANT OPTION;

GRANT REPLICATION SLAVE ON *.* to 'demo' @ ‘%’ identified by ’demo’ ;

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='192.168.2.100',master_user='demo',master_password='demo', 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

启动

sudo docker start mysql-master mysql-slave mysql-slave2

停止

sudo docker stop mysql-master mysql-slave mysql-slave2