MySQL 一主一从 部署
一、 ENV
- Master:
10.0.0.201
- Slave:
10.0.0.203
- mysql-version:
5.7.44
1.1 关闭防火墙和SElinux
systemctl stop firewalld
setenforce 0
sed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config
1.2 确保两台服务器时间同步
yum install chrony
yum enable chronyd --now
二、 主库配置
2.1 确保以下配置开启
[mysqld] |
2.2 为从库创建用户
CREATE USER 'repl'@'10.0.0.203' IDENTIFIED BY '$PASSWORD'; |
2.3 锁定主库并获取日志信息
FLUSH TABLES WITH READ LOCK; |
输出示例如下, 记下File
和 Position
, 配置从库的时候用得到。
mysql>
mysql> flush tables read lock;
mysql> flush tables with read lock;
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql> show master status;
+------------------+----------+--------------+------------------+-------------------------------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------------------------------+
| mysql-bin.000053 | 2392 | | | 84942b7b-7c8a-11ee-a8db-4609d97455dc:1-26 |
+------------------+----------+--------------+------------------+-------------------------------------------+
1 row in set (0.00 sec)
mysql>
2.4 解锁主库之前进行数据备份
这部分参考MySQL数据库备份
三、 从库配置
3.1 确保以下配置开启
注意: 主从库的server-id
一定不相同
[mysqld]
server-id=2
relay-log=/data/mysql/relay-log
gtid-mode=on
enforce-gtid-consistency=on
3.2 设置从库
mysql> |
3.3 查看从库状态
注意到如下两个参数显示为
yes
即表示主从复制配置成功Slave_IO_Running: Yes
Slave_SQL_Running: Yes
mysql>
mysql> show slave status \G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 10.0.0.201
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000053
Read_Master_Log_Pos: 2392
Relay_Log_File: relay-log.000003
Relay_Log_Pos: 320
Relay_Master_Log_File: mysql-bin.000053
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: 2392
Relay_Log_Space: 521
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: 84942b7b-7c8a-11ee-a8db-4609d97455dc
Master_Info_File: /data/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)
3.4 验证主从复制
主库上执行插入语句:
create database test;
从库查询该纪录
show databases;