mysql_主从同步

在这里我就不说怎么搭建 mysql 数据库了！如果有需要可以参照我前面的博文。

此博文主要说配置 linux  数据库   主从   下面我们开始进入正题。

master：192.168.31.200

slave：192.168.31.250

主：192.168.31.200   配置如下：

1.修改   /etc/my.cnf    添加以下配置信息

[mysqld]

log-bin = mysql-bin　　　　　　##开启 bin  日志
server-id =1　　　　　　　　　##指定
innodb-file-per-table =on　　　##开启独立表空间
skip_name_resolve=on　　　  ##禁止域名解析(优化的一部分_根据需求)

binlog_do_db=web　　　　　　##需要同步的数据库
binlog_do_db=mysql
binlog_do_db=webonline
binlog_do_db=hr

保存   wq   

2.重启数据库  

/etc/init.d/mysqld retart

 

3.进入数据库

[root@mysqlmaster ~]# mysql -uroot -p123456
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 4
server version: 5.6.42-log mysql community server (gpl)

copyright (c) 2000, 2018, oracle and/or its affiliates. all rights reserved.

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>

4.查看 master 值

mysql> show master status;
+------------------+----------+------------------------+------------------+-------------------+
| file | position | binlog_do_db | binlog_ignore_db | executed_gtid_set |
+------------------+----------+------------------------+------------------+-------------------+
| mysql-bin.000002 | 120 | web,mysql,webonline,hr | | |
+------------------+----------+------------------------+------------------+-------------------+
1 row in set (0.01 sec)

 

5.创建一个用户给主从链接

mysql> grant replication slave on *.* to 'lihong'@'192.168.31.250' identified by '123456';

 

从：192.168.31.250   配置如下：

1.修改   /etc/my.cnf    添加以下配置信息

[mysqld]

server-id=2
relay-log=relay-log
relay-log-index=relay-log.index
log-bin = mysql-bin
innodb-file-per-table =on
skip_name_resolve=on

binlog_do_db=web
binlog_do_db=mysql
binlog_do_db=webonline
binlog_do_db=hr

保存   wq   

 

2.重启数据库  

/etc/init.d/mysqld retart

 

3.进入数据库

[root@mysqlmaster ~]# mysql -uroot -p123456
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 4
server version: 5.6.42-log mysql community server (gpl)

copyright (c) 2000, 2018, oracle and/or its affiliates. all rights reserved.

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>

 

4.关闭 slave 

mysql> stop slave;
query ok, 0 rows affected, 1 warning (0.00 sec)

 

5.创建一个用户给主从链接

mysql> grant replication slave on *.* to 'lihong'@'192.168.31.250' identified by '123456';

 

6.配置关联的信息

mysql> change master to
-> master_host='192.168.31.200',
-> master_user='lihong',
-> master_password='123456',
-> master_log_file='mysql-bin.000002',
-> master_log_pos=120;

 

7.开启 slave 

mysql> start slave;
query ok, 0 rows affected (0.03 sec)

 

8.查看 slave 是否正常开启了以及是否同步了

mysql> show slave status\g;
*************************** 1. row ***************************
slave_io_state: waiting for master to send event
master_host: 192.168.31.200
master_user: lihong
master_port: 3306
connect_retry: 60
master_log_file: mysql-bin.000002
read_master_log_pos: 120
relay_log_file: relay-log.000003
relay_log_pos: 283
relay_master_log_file: mysql-bin.000002
slave_io_running: yes
slave_sql_running: yes
replicate_do_db:

 

9.是否同步成功，查看这两个状态值

slave_io_running: yes
slave_sql_running: yes