mysql主从复制实战

Posted 2020-09-05

mysql主从复制实战

主机规划
主：172.16.1.51    db01

从：172.16.1.52    db02

需求：mysql主库用户写入数据实时同步到从库、这里演示1主1从。

1、主机开启bin-log功能
[[email protected] ~]# egrep log_bin /etc/my.cnf

log_bin

2、主从server-id不同、主从/etc/my.cnf必须有server-id
[[email protected] ~]# egrep server-id /etc/my.cnf

server-id = 6

[[email protected] ~]# egrep server-id /etc/my.cnf

server-id = 7

3、主库创建授权用户
[[email protected] ~]# mysql -uroot -poldboy123

mysql> grant replication slave on *.* to ‘rep‘@‘172.16.1.%‘ identified by ‘oldboy123‘;

mysql> flush privileges;

4、使用mysqldump备份截止当前日期的数据

  1.锁表停止用户继续写入

mysql> flush table with read lock;   # 备份时锁表、不能退出mysql。

mysql> show master status;    # 查看主状态

+-------------------+----------+--------------+------------------+-------------------+
| File              | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+-------------------+----------+--------------+------------------+-------------------+
|  db01-bin.000001  |    120   |              |                  |                   |
+-------------------+----------+--------------+------------------+-------------------+
1 row in set (0.08 sec)

  2.单开xshell/CRT窗口开始备份

[[email protected] ~]# mysqldump -uroot -poldboy123 -A -B --master-data=2|gzip >/opt/db01.sql.gz

[[email protected] ~]# gzip -d /opt/db01.sql.gz

[[email protected] ~]# scp /opt/db01.sql 172.16.1.52:/opt/       #<==发送备份到从库

  3.原窗口取消锁表

mysql> unlock table;

5、从库开始恢复主库
[[email protected] ~]# mysql -uroot -poldboy123 </opt/db01.sql

6、从库指定主机、用户、位置点同步数据库操作
mysql> CHANGE MASTER TO 

MASTER_HOST=‘172.16.1.51‘,       #<==主机IP

MASTER_PORT=3306,      #<==端口

MASTER_USER=‘rep‘,        #<==主机管理用户

MASTER_PASSWORD=‘oldboy123‘,       #<==密码

MASTER_LOG_FILE=‘db01-bin.000001‘,    #<==binlog文件

MASTER_LOG_POS=120;          #<==binlog pos值

7、从库开启同步开关，检查是否同步
mysql> start slave;
mysql> show slave status\G
            Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
            Seconds_Behind_Master: 0
   提示：show slave status\G出来的结果包含以上三条内容为成功！

8、验证主从复制是否成功
**主：db01
mysql> create database lmin;
Query OK, 1 row affected (0.00 sec)
**从：db02
mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| lmin               |
| mysql              |
| performance_schema |
+--------------------+
4 rows in set (0.00 sec)

主从复制配置完毕！
说明：mysql主从复制不难，一主多从，多主多从、配置方法差不太多！

本文出自 “lming” 博客，请务必保留此出处http://lmin32.blog.51cto.com/12206256/1908683