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 statusG;
*************************** 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
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