docker-mysql 主从复制
发布于 更新于 docker, mysql 0 字数统计: 839(字) 阅读时长: 4(分) docker-mysql 主从复制
源码地址
启动容器
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| docker-compose up -d --build
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mysql 操作
master 操作
进入 mysql-master 容器。
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| docker exec -it mysql-master sh
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查看容器 ip
创建用户
执行以下命令，创建用于同步的用户账号 rep，密码是 888888
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| mysql> CREATE USER 'rep'@'%' IDENTIFIED BY '888888';
Query OK, 0 rows affected (0.16 sec)
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授权用户
执行以下命令，授权用户同步
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| mysql> GRANT REPLICATION SLAVE ON *.* TO 'rep'@'%';
Query OK, 0 rows affected (1.01 sec)
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刷新权限
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| mysql> flush privileges;
Query OK, 0 rows affected (0.06 sec)
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查看同步状态
执行命令 show master status; 查看同步状态，如下，请关注下表的 File 和 Position 这两个字段的值
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| mysql> show master status;
+------------------+----------+--------------+-------------------------------------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+-------------------------------------------------+-------------------+
| mysql-bin.000002 | 745 | | information_schema,mysql,performance_schema,sys | |
+------------------+----------+--------------+-------------------------------------------------+-------------------+
1 row in set (0.01 sec)
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至此，master已经设置成功，接下来设置slave吧，
slave 操作
进入 mysql-slave 容器。
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| docker exec -it mysql-slave sh
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设置主从同步的参数
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| CHANGE MASTER TO MASTER_HOST='192.168.64.2', \
MASTER_USER='rep', \
MASTER_PASSWORD='888888', \
MASTER_LOG_FILE='mysql-bin.000002', \
MASTER_LOG_POS=745;
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MASTER_HOST 是 master 的IP地址；
MASTER_USER 和 MASTER_PASSWORD 是 master 授权的同步账号和密码；
MASTER_LOG_FILE 是 master 的 bin log 文件名；
MASTER_LOG_POS 是 bin log 同步的位置；
启动同步
在MySQL命令行执行 start slave;
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| mysql> start slave;
Query OK, 0 rows affected (0.07 sec)
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查看同步状态
在MySQL命令行执行 show slave status\G
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| mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.64.2
Master_User: rep
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000002
Read_Master_Log_Pos: 745
Relay_Log_File: 40fcf9eae6b2-relay-bin.000002
Relay_Log_Pos: 320
Relay_Master_Log_File: mysql-bin.000002
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: 745
Relay_Log_Space: 534
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: 1
Master_UUID: 01784cbe-746f-11ed-9ac0-0242c0a84002
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)
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检查以上信息中的 Slave_IO_Running 和 Slave_SQL_Running 两个字段的值，如果都是Yes就表示同步启动成功，否则代表启动失败，Slave_SQL_Running_State 字段会说明失败原因；
至此，MySQL主从同步已经完成，接下来一起验证一下吧。
验证主从同步
master
进入 master 容器的 MySQL 命令行，执行以下四个命令，完成创建数据库、选择数据库、创建表、新增记录等操作
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| create database test001;
use test001;
CREATE TABLE `test_table` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(100) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
insert into test_table(name) values ('docker');
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slave
进入 slave 容器的 MySQL 命令行，选择 test001 数据库，可以看到表 test_table 和记录都已经同步过来了
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| mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
| test001 |
+--------------------+
5 rows in set (0.00 sec)
mysql> use test001;
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> select * from test_table;
+----+-------+
| id | name |
+----+-------+
| 1 | docker |
+----+-------+
1 row in set (0.00 sec)
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遇到的问题
ERROR 2002 (HY000): Can’t connect to local MySQL server through socket ‘/var/run/mysqld/mysqld.sock’ (2)
解决方法：删除 /var/run/mysqld/mysqld.sock,重启容器
mysql: [Warning] World-writable config file ‘/etc/mysql/conf.d/mysql.cnf’ is ignored.
解决方法：chmod 644 mysql.cnf
为什么 mysql.cnf 不使用 docker 数据卷 volumes 挂载？
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| volumes:
- ./master/mysql.cnf:/etc/mysql/conf.d/mysql.cnf
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原因：使用数据卷挂载之后会报错上面的问题二
