docker部署MySQL主从同步 原创

docker部署MySQL主从同步

下载MySQL5.7镜像

[root@localhost ~]# docker pull mysql:5.7
[root@localhost ~]# docker images
REPOSITORY   TAG       IMAGE ID       CREATED       SIZE
mysql        5.7       c20987f18b13   2 years ago   448MB

一、新建主服务器容器实例 3307端口

格式：
docker run -d -p 3307:3306 --name=mysql-master \
--privileged=true \
-v /docker-volume/mysql-master/log:/var/log/mysql \
-v /docker-volume/mysql-master/data:/var/lib/mysql \
-v /docker-volume/mysql-master/conf:/etc/mysql/conf.d \
-e MYSQL_ROOT_PASSWORD=123456 mysql:5.7

[root@localhost ~]# docker ps
CONTAINER ID   IMAGE       COMMAND                  CREATED         STATUS        PORTS                                                  NAMES
e7d217996fc2   mysql:5.7   "docker-entrypoint.s…"   2 seconds ago   Up 1 second   33060/tcp, 0.0.0.0:3307->3306/tcp, :::3307->3306/tcp   mysql-master

-d    				 后台运行
-p      			 指定端口映射   宿主机端口:容器内端口
--name               容器名称
--privileged=true    特权
-v				     容器数据卷
-e				     环境，这里设置的是数据库密码

1. 修改MySQL配置文件

进入数据卷的目录

[root@localhost ~]# cd /docker-volume/mysql-master/conf/
[root@localhost conf]# ls
[root@localhost conf]# vi my.cnf
[root@localhost conf]# cat my.cnf
[mysqld]
## 设置server_id，同一局域网中需要唯一
server_id=101
## 指定不需要同步的数据库名称
binlog-ignore-db=mysql
## 开启二进制日志功能
log-bin=mall-mysql-bin
## 设置二进制日志使用内存大小（事务）
binlog_cache_size=1M
## 设置使用的二进制日志格式
binlog_format=mixed
## 二进制日志过期清理时间。默认值为0，表示不自动清理
expire_logs_days=7
## 跳过主从复制中遇到的所有错误或指定类型的错误，避免slave端复制中断
## 如：1062错误是指一些主键重复，1032错误是因为主从数据库数据不一致
slave_skip_errors=1062

重启MySQL容器,让配置文件生效

[root@localhost conf]# docker restart mysql-master
mysql-master
[root@localhost conf]# docker ps
CONTAINER ID   IMAGE       COMMAND                  CREATED         STATUS          PORTS                                                  NAMES
e7d217996fc2   mysql:5.7   "docker-entrypoint.s…"   6 minutes ago   Up 44 seconds   33060/tcp, 0.0.0.0:3307->3306/tcp, :::3307->3306/tcp   mysql-master

2. 进入容器实例，登录MySQL

[root@localhost conf]# docker exec -it mysql-master /bin/bash
root@e7d217996fc2:/# mysql -uroot -p123456
mysql: [Warning] Using a password on the command line interface can be insecure.
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.

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
+--------------------+
4 rows in set (0.00 sec)

3. master容器内创建数据同步的用户

1. 创建slave用户，密码123456
create user 'slave'@'%' identified by '123456';

2. 授权salve用户做相应的读写权限
grant replication slave,replication client on *.* to 'slave'@'%';

二、新建从服务器实例 3308端口

docker run -d -p 3308:3306 --name=mysql-slave \
--privileged=true \
-v /docker-volume/mysql-slave/log:/var/log/mysql \
-v /docker-volume/mysql-slave/data:/var/lib/mysql \
-v /docker-volume/mysql-slave/conf:/etc/mysql/conf.d \
-e MYSQL_ROOT_PASSWORD=123456 mysql:5.7

[root@localhost ~]# docker ps
CONTAINER ID   IMAGE       COMMAND                  CREATED          STATUS          PORTS                                                  NAMES
c0d3b830bf96   mysql:5.7   "docker-entrypoint.s…"   2 seconds ago    Up 1 second     33060/tcp, 0.0.0.0:3308->3306/tcp, :::3308->3306/tcp   mysql-slave
e7d217996fc2   mysql:5.7   "docker-entrypoint.s…"   36 minutes ago   Up 30 minutes   33060/tcp, 0.0.0.0:3307->3306/tcp, :::3307->3306/tcp   mysql-master

-d    				 后台运行
-p      			 指定端口映射   宿主机端口:容器内端口
--name               容器名称
--privileged=true    特权
-v				     容器数据卷
-e				     环境，这里设置的是数据库密码

1. 修改配置文件

进入数据卷目录添加my.cnf配置文件

[root@localhost ~]# cd /docker-volume/
[root@localhost docker-volume]# ls
mysql-master  mysql-slave
[root@localhost docker-volume]# cd mysql-slave/conf/
[root@localhost conf]# ls
[root@localhost conf]# vi my.cnf
[root@localhost conf]# cat my.cnf
[mysqld]
## 设置server_id，同一局域网中需要唯一
server_id=102
## 指定不需要同步的数据库名称
binlog-ignore-db=mysql
## 开启二进制日志功能
log-bin=mall-mysql-slave1-bin
## 设置二进制日志使用内存大小（事务）
binlog_cache_size=1M
## 设置使用的二进制日志格式
binlog_format=mixed
## 二进制日志过期清理时间。默认值为0，表示不自动清理
expire_logs_days=7
## 跳过主从复制中遇到的所有错误或指定类型的错误，避免slave端复制中断
## 如：1062错误是指一些主键重复，1032错误是因为主从数据库数据不一致
slave_skip_errors=1062
## relay_log配置中继日志
relay_log=mall-mysql-relay-bin
## log_slave_updates表示slave将复制事件写进自己的二进制日志
log_slave_updates=1
## slave设置为只读（具有super权限的用户除外）
read_only=1

重启docker-slave容器让配置文件生效

[root@localhost conf]# docker restart mysql-slave
mysql-slave
[root@localhost conf]# docker ps
CONTAINER ID   IMAGE       COMMAND                  CREATED          STATUS          PORTS                                                  NAMES
c0d3b830bf96   mysql:5.7   "docker-entrypoint.s…"   6 minutes ago    Up 1 second     33060/tcp, 0.0.0.0:3308->3306/tcp, :::3308->3306/tcp   mysql-slave
e7d217996fc2   mysql:5.7   "docker-entrypoint.s…"   42 minutes ago   Up 37 minutes   33060/tcp, 0.0.0.0:3307->3306/tcp, :::3307->3306/tcp   mysql-master

三、配置主从

master节点

[root@localhost conf]# docker exec -it mysql-master /bin/bash
root@e7d217996fc2:/# mysql -uroot -p123456

mysql> show master status;
+-----------------------+----------+--------------+------------------+-------------------+
| File                  | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+-----------------------+----------+--------------+------------------+-------------------+
| mall-mysql-bin.000001 |      778 |              | mysql            |                   |
+-----------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)

slave节点

[root@localhost conf]# docker exec -it mysql-slave /bin/bash
root@c0d3b830bf96:/# mysql -uroot -p123456

mysql> change master to master_host='192.168.174.200', master_user='slave', master_password='123456',
master_port=3307, master_log_file='mall-mysql-bin.000001', master_log_pos=778, master_connect_retry=3;
Query OK, 0 rows affected, 2 warnings (0.01 sec)

解析：
change master to master_host='宿主机ip地址',
master_user='用户', master_password='密码',
master_port=master的端口,
master_log_file='master节点输入show master status查看FIle字段', master_log_pos=778,
master_connect_retry=3;

开启主从复制并查看
slave节点

mysql> start slave;
Query OK, 0 rows affected (0.01 sec)

mysql> show slave status \G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.174.200
                  Master_User: slave
                  Master_Port: 3307
                Connect_Retry: 30
              Master_Log_File: mall-mysql-bin.000001
          Read_Master_Log_Pos: 778
               Relay_Log_File: mall-mysql-relay-bin.000002
                Relay_Log_Pos: 325
        Relay_Master_Log_File: mall-mysql-bin.000001
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB:
          Replicate_Ignore_DB:
           Replicate_Do_Table:
       Replicate_Ignore_Table:
      Replicate_Wild_Do_Table:
  Replicate_Wild_Ignore_Table:
                   Last_Errno: 0
                   Last_Error:
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 778
              Relay_Log_Space: 537
              Until_Condition: None
               Until_Log_File:
                Until_Log_Pos: 0
           Master_SSL_Allowed: No
           Master_SSL_CA_File:
           Master_SSL_CA_Path:
              Master_SSL_Cert:
            Master_SSL_Cipher:
               Master_SSL_Key:
        Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
                Last_IO_Errno: 0
                Last_IO_Error:
               Last_SQL_Errno: 0
               Last_SQL_Error:
  Replicate_Ignore_Server_Ids:
             Master_Server_Id: 101
                  Master_UUID: 48d3a1b9-0cd2-11ef-a449-0242ac110002
             Master_Info_File: /var/lib/mysql/master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
           Master_Retry_Count: 86400
                  Master_Bind:
      Last_IO_Error_Timestamp:
     Last_SQL_Error_Timestamp:
               Master_SSL_Crl:
           Master_SSL_Crlpath:
           Retrieved_Gtid_Set:
            Executed_Gtid_Set:
                Auto_Position: 0
         Replicate_Rewrite_DB:
                 Channel_Name:
           Master_TLS_Version:
1 row in set (0.00 sec)

四、验证

master节点
创建数据库、创建数据表、插入数据

mysql> create database test;
Query OK, 1 row affected (0.00 sec)

mysql> use test;
Database changed
mysql> create table demo(id int,name varchar(20));
Query OK, 0 rows affected (0.01 sec)

mysql> show tables;
+----------------+
| Tables_in_test |
+----------------+
| demo           |
+----------------+
1 row in set (0.00 sec)

mysql> insert into demo values (1,'zhangsan');
Query OK, 1 row affected (0.00 sec)

mysql> select * from test;
ERROR 1146 (42S02): Table 'test.test' doesn't exist
mysql> select * from demo;
+------+----------+
| id   | name     |
+------+----------+
|    1 | zhangsan |
+------+----------+
1 row in set (0.00 sec)

slave节点
查询数据，发现同步过来了

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
| test               |
+--------------------+
5 rows in set (0.00 sec)

mysql> 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
mysql> show tables;
+----------------+
| Tables_in_test |
+----------------+
| demo           |
+----------------+
1 row in set (0.00 sec)

mysql> select * from demo;
+------+----------+
| id   | name     |
+------+----------+
|    1 | zhangsan |
+------+----------+
1 row in set (0.00 sec)