数据库主从配置

准备两台服务器：
Master：192.168.189.121
Slave： 192.168.189.120

两台主机安装mysql
yum -y install mysql mysql-server
service mysqld start
service iptables stop
setenforce 0

Master主机配置
开启二进制日志

vim /etc/my.cnf

server-id=1
log-bin=mysql-bin

保存退出重启mysql
service mysqld restart

登录到mysql中给slave主机授权同步账号

mysql -uroot

grant replication slave on *.* to 'tom'@'%' identified by '123';
flush privileges;

授权完后，查看二进制日志文件和位置

mysql> show master status;
+------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000001 | 333 | | |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)

Slave主机的配置
开启中继日志
vim /etc/my.cnf

server-id=2
relay-log=mysql-relay

保存退出，重启mysql
service mysqld restart

登录mysql配置同步
mysql -uroot

stop slave；

mysql> change master to
-> master_host='192.168.189.121',
-> master_user='tom',
-> master_password='123',
-> master_log_file='mysql-bin.000001',
-> master_log_pos=333;

启动slave
start slave；

查看slave的状态
mysql> show slave status \G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.189.121
Master_User: slave
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000001
Read_Master_Log_Pos: 333
Relay_Log_File: mysql-relay.000002
Relay_Log_Pos: 251
Relay_Master_Log_File: mysql-bin.000001
Slave_IO_Running: Yes
Slave_SQL_Running: Yes

查看到IO和SQL线程都为Yes说明已经成功，下面可以在Master主机上创建一个数据库测试，slave是否同步；