搭建环境：mysql-z ： 117.34.95.161:3306
mysql-c1：117.34.95.161:23306
mysql-c2：117.34.95.161:13306
均为CentOS 6.6、mysql5.6
一、安装数据库（略）
二、配置主数据库
1、 编辑/etc/my.cnf 添加以下两行
server_id=1
log_bin=mysql_bin
binlog-do-db=maidong #需要同步的数据库名，如果有多个数据库，可重复此参数，每个数据库一行
binlog-ignore-db=mysql #不同步mysql系统数据库
（以上两行不加时为同步全部数据库）
重启服务：service mysqld restart
2、进入mysql命令控制台
show variables like 'server_id'; #查看server_id是否是1
mysql> show variables like 'server_id';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| server_id | 1 |
+---------------+-------+
1 row in set (0.00 sec)
mysql> show master status; #查看主服务器信息，记录file跟pos
+------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql_bin.000002 | 304 | | | |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
3、配置权限
create database maidong;
create user maidong identified by '123456';
grant all privileges on maidong.* to maidong@'%' identified by '123456'；
grant all on *.* to 'maidong'@'10.57.96.54' identified by '111111' with grant option; #授权用户maidong从10.57.96.54完全访问数据库，注意：这里的10.57.96.54是要连接数据库Web服务器IP
grant replication slave on *.* to 'maidong'@'10.57.96.54' identified by '111111' with grant option; #授权用户maidong只能从10.57.96.54这个IP访问主服务器117.34.95.161上面的数据库，并且只具有数据库备份的权限
flush privileges;
4、把主数据库上的数据库导入从数据库（略 ）
三、配置从数据库
1、编辑配置文件
vim /etc/my.cnf
server-id=2 #设置服务器id，修改其值为2，表示为从数据库，与主数据库不同即可
log-bin=mysql-bin #启动MySQ二进制日志系统，注意：如果原来的配置文件中已经有这一行，就不用再添加了。
replicate-do-db=maidong #需要同步的数据库名，如果有多个数据库，可重复此参数，每个数据库一行
replicate-ignore-db=mysql #不同步mysql系统数据库
read_only #设置数据库只读
service mysqld restart;
2、进入mysql命令行
show variables like 'server_id';
mysql> show variables like 'server_id';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| server_id | 2 |
+---------------+-------+
1 row in set (0.00 sec)
stop slave;
change master to master_host='117.34.95.161', master_port=3306, master_user='maidong', master_password='111111', master_log_file='mysql_bin.000002',master_log_pos=304; #执行同步语句
start slave; #开启slave同步进程
show slave status\G; #查看slave同步信息
mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.1.110
Master_User: wanmeng
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql_bin.000002
Read_Master_Log_Pos: 304
Relay_Log_File: mysql-c1-relay-bin.000002
Relay_Log_Pos: 467
Relay_Master_Log_File: mysql_bin.000002
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 304
Relay_Log_Space: 643
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 1
Master_UUID: e9a5acfc-ca98-11e5-b6a0-005056931c66
Master_Info_File: /usr/local/mysql/data/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set:
Auto_Position: 0
1 row in set (0.00 sec)
注意查看：
Slave_IO_Running: Yes #连接到主库，并读取主库的日志到本地，生成本地日志文件
Slave_SQL_Running: Yes #读取本地日志文件，并执行日志里的SQL命令。
两个参数均为yes说明配置成功
另一台从数据库做同样操作，server_id不同即可