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
如对本文有疑问， 点击进行留言回复！！
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