有了钱，在这个世界上可以做很多事，就是无法用钱来买青春。 ——雷蒙德
1.安装主库
1.1 先准备mysql配置文件，my.cnf
# Copyright (c) 2017, 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 Server configuration file. # # For explanations see # http://dev.mysql.com/doc/mysql/en/server-system-variables.html [mysqld] pid-file = /var/run/mysqld/mysqld.pid socket = /var/run/mysqld/mysqld.sock datadir = /var/lib/mysql secure-file-priv= NULL # Custom config should go here !includedir /etc/mysql/conf.d/ ## 同一局域网内注意要唯一 server-id=100 ## 开启二进制日志功能，可以随便取（关键） log-bin=mysql-bin
1.2 下载镜像，制作容器
docker pull mysql docker run -p 3306:3306 --name mysql8 -v $PWD/conf:/etc/mysql/conf.d -v $PWD/logs:/logs -v $PWD/data:/var/lib/mysql -v $PWD/my.cnf:/etc/mysql/my.cnf -e MYSQL_ROOT_PASSWORD=123456 -d mysql --lower_case_table_names=1
# 把配置文件挂载到容器中，因为容器内部不能使用vi -v $PWD/my.cnf:/etc/mysql/my.cnf
1.3允许root 远程登录
docker exec -it mysql8 /bin/bash mysql -uroot -p mysql> GRANT ALL ON *.* TO 'root'@'%'; mysql> flush privileges; mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY '123456' PASSWORD EXPIRE NEVER; mysql> ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY '123456'; mysql> flush privileges;
1.4 创建数据同步用户
在Master数据库创建数据同步用户，授予用户 slave REPLICATION SLAVE权限和REPLICATION CLIENT权限，用于在主从库之间同步数据。
CREATE USER 'slave'@'%' IDENTIFIED WITH mysql_native_password BY '123456'; GRANT REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO 'slave'@'%';
- 安装从库
2.1 准备配置文件，my2.cnf
# Copyright (c) 2017, 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 Server configuration file. # # For explanations see # http://dev.mysql.com/doc/mysql/en/server-system-variables.html [mysqld] pid-file = /var/run/mysqld/mysqld.pid socket = /var/run/mysqld/mysqld.sock datadir = /var/lib/mysql secure-file-priv= NULL # Custom config should go here !includedir /etc/mysql/conf.d/ ## 设置server_id,注意要唯一 server-id=101 ## 开启二进制日志功能，以备Slave作为其它Slave的Master时使用 log-bin=mysql-slave-bin ## relay_log配置中继日志 relay_log=edu-mysql-relay-bin
2.1 制作容器
docker run -p 3307:3306 --name mysql8-2 -v $PWD/conf2:/etc/mysql/conf.d -v $PWD/logs2:/logs -v $PWD/data2:/var/lib/mysql -v $PWD/my2.cnf:/etc/mysql/my.cnf -e MYSQL_ROOT_PASSWORD=123456 -d mysql --lower_case_table_names=1
然后重复1.3
2.2 链接Master(主)和Slave(从)
在主库中进入mysql，执行
flush logs; show master status;
记住file和position
期间主库不要进行任何操作，然后在从库中执行
change master to master_host='172.17.0.3', master_user='slave', master_password='123456', master_port=3306, master_log_file='mysql-bin.000004', master_log_pos= 156, master_connect_retry=30;
master_host ：Master的地址，指的是容器的独立ip,可以通过docker inspect --format='{ {.NetworkSettings.IPAddress} }' 容器名称|容器id 查询容器的ip
master_port：Master的端口号，指的是容器的端口号
master_user：用于数据同步的用户
master_password：用于同步的用户的密码
master_log_file：指定 Slave 从哪个日志文件开始复制数据，即上文中提到的 File 字段的值
master_log_pos：从哪个 Position 开始读，即上文中提到的 Position 字段的值
master_connect_retry：如果连接失败，重试的时间间隔，单位是秒，默认是60秒
2.3 在Slave 中的mysql终端执行show slave status \G;用于查看主从同步状态。
正常情况下，Slave_IO_Running 和 Slave_SQL_Running 都是No，因为我们还没有开启主从复制过程。使用start slave开启主从复制过程，然后再次查询主从同步状态 show slave status \G;。
看到两个yes就成功了。
2.4 验证
测试主从复制方式就十分多了，最简单的是在Master创建一个数据库，然后检查Slave是否存在此数据库。
- 再配置一个从数据库
docker run -p 3308:3306 --name mysql8-3 -v $PWD/conf3:/etc/mysql/conf.d -v $PWD/logs3:/logs -v $PWD/data3:/var/lib/mysql -v $PWD/my2.cnf:/etc/mysql/my.cnf -e MYSQL_ROOT_PASSWORD=123456 -d mysql --lower_case_table_names=1
然后重复步骤2.2,2.3就行了
