八、Docker版MySQL主从复制

[root@localhost conf]# docker run -p 3307:3306 
-v /usr/mysql/mysql-master/log:/var/log/mysql \
-v /usr/mysql/mysql-master/data:/var/lib/mysql \
-v /usr/mysql/mysql-master/conf:/etc/mysql \
-e MYSQL_ROOT_PASSWORD=123456 \
--name=mysql-master \
-d mysql:5.7
cb51f77c7b6294cb5f7b12624c2a1ac430bb406c75dd2d386d8c32a97b2a8eae
[root@localhost conf]# 
[root@localhost conf]# 
[root@localhost conf]# docker ps
CONTAINER ID   IMAGE       COMMAND                  CREATED         STATUS         PORTS                                                  NAMES
cb51f77c7b62   mysql:5.7   "docker-entrypoint.s..."   5 seconds ago   Up 4 seconds   33060/tcp, 0.0.0.0:3307->3306/tcp, :::3307->3306/tcp   mysql-master
[root@localhost conf]#

2、进入/usr/mysql/mysql-master/conf目录下新建my.cnf

[root@localhost conf]# pwd
/usr/mysql/mysql-master/conf
[root@localhost conf]# vim my.cnf
[client]
user=root
password=xxxxxx
default-character-set=utf8

[mysql]
prompt=(\\u@\\h) [\\d]>\\_

[mysqld]
server_id=1
log-bin=mysql-bin

#设置二进制日志使用内存的大小
binlog_cache_size=1M
#二进制日志格式
binlog_format=mixed
#日志清理时间
expire_logs_days=7
collation_server = utf8_general_ci
character-set-server=utf8
slave_skip_errors=1062

3、修改完配置后，重启master实例

[root@localhost conf]# docker restart mysql-master 
mysql-master
[root@localhost conf]# 
[root@localhost conf]# docker ps
CONTAINER ID   IMAGE       COMMAND                  CREATED          STATUS         PORTS                                                  NAMES
cb51f77c7b62   mysql:5.7   "docker-entrypoint.s..."   11 minutes ago   Up 2 seconds   33060/tcp, 0.0.0.0:3307->3306/tcp, :::3307->3306/tcp   mysql-master
[root@localhost conf]#

4、进入mysql-master容器

[root@localhost conf]# docker exec -it mysql-master /bin/bash
root@cb51f77c7b62:/# 
root@cb51f77c7b62:/# mysql
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.36-log MySQL Community Server (GPL)

Copyright (c) 2000, 2021, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

(root@localhost) [(none)]> 
(root@localhost) [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
+--------------------+
4 rows in set (0.00 sec)

(root@localhost) [(none)]>

5、在mysql-master容器中创建数据同步用户

(root@localhost) [(none)]> create user 'repl'@'%' identified by '123456';
Query OK, 0 rows affected (0.00 sec)

(root@localhost) [(none)]> GRANT REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO 'repl'@'%';
Query OK, 0 rows affected (0.00 sec)

(root@localhost) [(none)]> ALTER USER 'repl'@'%' IDENTIFIED WITH mysql_native_password BY '123456';
Query OK, 0 rows affected (0.00 sec)

(root@localhost) [(none)]>

6、新建从服务器容器实例3308

[root@localhost ~]# docker run -p 3308:3306 
-v /usr/mysql/mysql-slave/conf:/etc/mysql 
-v /usr/mysql/mysql-slave/data:/var/lib/mysql 
-v/usr/mysql/mysql-slave/log:/var/log/mysql 
-e MYSQL_ROOT_PASSWORD=123456 
--name=mysql-slave 
-d mysql:5.7
9a5bbcb88dedafc4b4485ef48e0df72641748ac95ff3af1b5a1cfd60d053a3f2
[root@localhost ~]# 
[root@localhost ~]# 
[root@localhost ~]# docker ps
CONTAINER ID   IMAGE       COMMAND                  CREATED          STATUS          PORTS                                                  NAMES
9a5bbcb88ded   mysql:5.7   "docker-entrypoint.s..."   4 seconds ago    Up 3 seconds    33060/tcp, 0.0.0.0:3308->3306/tcp, :::3308->3306/tcp   mysql-slave
cb51f77c7b62   mysql:5.7   "docker-entrypoint.s..."   48 minutes ago   Up 37 minutes   33060/tcp, 0.0.0.0:3307->3306/tcp, :::3307->3306/tcp   mysql-master
[root@localhost ~]#

7、进去/usr/mysql/mysql-slave/conf目录下新建my.cnf

把master的配置文件cp过来，修改下server-id 即可
[root@localhost conf]# cp /usr/mysql/mysql-master/conf/my.cnf ./
[root@localhost conf]# 
[root@localhost conf]# ll
total 4
-rw-r--r--. 1 root root 347 Jun 25 14:49 my.cnf
[root@localhost conf]# 
[root@localhost conf]# 
[root@localhost conf]# vim my.cnf 
[root@localhost conf]#

8、修改完配置后重启slave实例

[root@localhost ~]# docker restart mysql-slave 
mysql-slave
[root@localhost ~]# 
[root@localhost ~]# docker ps
CONTAINER ID   IMAGE       COMMAND                  CREATED          STATUS          PORTS                                                  NAMES
9a5bbcb88ded   mysql:5.7   "docker-entrypoint.s..."   4 minutes ago    Up 2 seconds    33060/tcp, 0.0.0.0:3308->3306/tcp, :::3308->3306/tcp   mysql-slave
cb51f77c7b62   mysql:5.7   "docker-entrypoint.s..."   53 minutes ago   Up 42 minutes   33060/tcp, 0.0.0.0:3307->3306/tcp, :::3307->3306/tcp   mysql-master
[root@localhost ~]#

9、在主数据库中查看主从同步状态

(root@localhost) [(none)]> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000001 |      851 |              |                  |                   |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)

(root@localhost) [(none)]>

10、进入mysql-slave容器

[root@localhost ~]# docker exec -it mysql-slave /bin/bash
root@9a5bbcb88ded:/# 
root@9a5bbcb88ded:/# mysql
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.36-log MySQL Community Server (GPL)

Copyright (c) 2000, 2021, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

(root@localhost) [(none)]> 
(root@localhost) [(none)]>

11、在从数据库中配置主从复制

change master to 
master_host='宿主机IP',
master_user='repl', #主数据库创建的用于同步数据的用户账号
master_password='123456',#主数据库创建的用于同步数据的用户密码
master_port=3307,#主数据库运行的端口
master_log_ffile='mysql-bin.000001',#查看主库状态获取参数
master_log_pos=851,#查看主库状态获取参数
master_connect_retry=30;#连接失败重试的时间间隔
(root@localhost) [(none)]> change master to master_host='192.168.153.128',master_user='repl',master_password='123456',master_port=3307,master_log_ffile='mysql-bin.000001',master_log_pos=851,master_connect_retry=30;
Query OK, 0 rows affected, 2 warnings (0.01 sec)

(root@localhost) [(none)]>

12、在从数据库中查看主从同步状态

(root@localhost) [(none)]> show slave status \G
*************************** 1. row ***************************
               Slave_IO_State: 
                  Master_Host: 192.168.153.128
                  Master_User: repl
                  Master_Port: 3307
                Connect_Retry: 30
              Master_Log_File: mysql-bin.000001
          Read_Master_Log_Pos: 851
               Relay_Log_File: 9a5bbcb88ded-relay-bin.000001
                Relay_Log_Pos: 4
        Relay_Master_Log_File: mysql-bin.000001
             Slave_IO_Running: No
            Slave_SQL_Running: No

13、在从数据库中开启主从同步

(root@localhost) [(none)]> start slave;
Query OK, 0 rows affected (0.01 sec)

(root@localhost) [(none)]>
(root@localhost) [(none)]> show slave status \G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.153.128
                  Master_User: repl
                  Master_Port: 3307
                Connect_Retry: 30
              Master_Log_File: mysql-bin.000001
          Read_Master_Log_Pos: 851
               Relay_Log_File: 9a5bbcb88ded-relay-bin.000002
                Relay_Log_Pos: 320
        Relay_Master_Log_File: mysql-bin.000001
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB:

14、主从复制测试

在主库操作
(root@localhost) [(none)]> create database test;
Query OK, 1 row affected (0.00 sec)

(root@localhost) [(none)]> use test;
Database changed


(root@localhost) [test]> create table test1(id int,name varchar(20));
Query OK, 0 rows affected (0.00 sec)

(root@localhost) [test]> 
(root@localhost) [test]> insert into test1 values(1,'wu');
Query OK, 1 row affected (0.02 sec)

(root@localhost) [test]> 
(root@localhost) [test]> insert into test1 values(2,'kang');
Query OK, 1 row affected (0.00 sec)

(root@localhost) [test]>

在从库查看
(root@localhost) [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
| test               |
+--------------------+
5 rows in set (0.00 sec)

(root@localhost) [(none)]> use test;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
(root@localhost) [test]> select * from test1;
+------+------+
| id   | name |
+------+------+
|    1 | wu   |
|    2 | kang |
+------+------+
2 rows in set (0.00 sec)

(root@localhost) [test]>
测试完成！