1.创建一个数据库用于测试同步；
mysql> create database dragon;
Query OK, 1 row affected (0.04 sec)
mysql> use dragon
Database changed
mysql> create table user(id int(5),name char(20));
Query OK, 0 rows affected (0.17 sec)
mysql> quit
2.修改主库my.cnf主要设置个不一样的ID，以及同步的数据库的名字，我一般用vim 来完成，vim /etc/my.cnf 在[mysqld]中加入内容如下
server-id=1
log-bin=binlog
binlog-do-db=dragon #指明同步那些数据库
replicate-ignore-db=mysql #指明不同步那些数据库
replicate-ignore-db=information_schema
port=3306
重启服务使得配置文件生效
[[email protected] ~]# service mysqld restart
Shutting down MySQL. [确定]
Starting MySQL.. [确定]
[[email protected] ~]# mysql -uroot -p123
3.登录主库赋予从库权限账号，允许用户在主库上读取日志(用户名： admin密码：123456）
[[email protected] ~]# mysql -uroot -p123
mysql> grant replication slave on *.* to ‘admin‘@‘10.10.10.2‘ identified by ‘123456‘;
Query OK, 0 rows affected (0.01 sec)
在slave上测试账号是否能够被登陆：
[[email protected] ~]# mysql -uadmin -p123456 -h 10.10.10.1 -S/tmp/mysql.sock
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.5.33-log Source distribution
Copyright (c) 2000, 2013, 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.slave机器获取mastre快照。有两种方法：一种是进入/var/lib/mysql/用tar方法备份
[[email protected] mysql]# cd /usr/local/mysql/data/
[[email protected] data]# tar czvf dragon.tar.gz dragon/
dragon/
dragon/db.opt
dragon/user.frm
[[email protected] data]# scp dragon.tar.gz 10.10.10.2:/usr/local/mysql/data
The authenticity of host ‘10.10.10.2 (10.10.10.2)‘ can‘t be established.
RSA key fingerprint is 01:77:02:41:8b:f3:86:3e:e9:58:b3:f2:91:34:91:90.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added ‘10.10.10.2‘ (RSA) to the list of known hosts.
[email protected]‘s password:
dragon.tar.gz 100% 416 0.4KB/s 00:00
[[email protected] data]# tar zxf dragon.tar.gz
[[email protected] data]# service mysqld restart
5.在master1上查看dragon数据文件的信息（记录file、position,从库设置将会用到），并且锁住表；
mysql> flush tables with read lock;
Query OK, 0 rows affected (0.01 sec)
mysql> show master status;
+------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000024 | 563 | dragon | |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)
mysql> unlock tables;
6.修改slave2的配置文件vim /etc/my.cnf,把server_id改为2或者添加server_id=2,总之server_id是一个与master的server_id不同数值即可，如果server_id与master相同会出现1593这个错误，可以进入数据库通过" show variables like "server_id""来查看servver_id是否被更改. 进入slave的数据库进行下一步同步配置。
mysql> slave stop;
Query OK, 0 rows affected (0.00 sec)
mysql>change master to master_host=‘10.10.10.1‘,master_user=‘admin‘,master_password=‘123456‘,master_log_file=‘mysql-bin.000024 ‘,master_log_pos=563;
mysql> slave start;
Query OK, 0 rows affected (0.00 sec)
重启一下数据库：service mysqld restart;再进入数据库查看同步是否成功，slave_io_running和slave_sql_running均为YES。
mysql>show slave status\G;
…
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
在master1上创建一个表，再到slave上查看表有没有被同步到。
mysql> create table dragonttest(id int(4),name char(10));
Query OK, 0 rows affected (0.18 sec)
mysql>
mysql> show tables;
+------------------+
| Tables_in_dragon |
+------------------+
| dragonttest |
| user |
+------------------+
2 rows in set (0.00 sec)
配置主主备份：
这里才是主主复制的开始，其实方法很简单，我们之前可以实现主从复制也就是说，再把从做为主，主再做为从，就实现主主复制了，我是在主从复制完成后在此基础上去完成主主复制的。
1、编辑之前的从服务器，也就是现在的master2
vim /etc/my.cnf
加入如下内容：
binlog-do-db=dragon
replicate-ignore-db=test
replicate-ignore-db=mysql
replicate-ignore-db=information_schema
port=3306
2.重启服务
service mysqld restart
3、登录master2(master2 Ip地址为10.10.10.2）数据库赋予master数据库权限账号，允许用户在master主库（ip 为10.10.10.1）上读取日志(用户名： admin密码：123456）
mysql -uroot -p123
grant replication slave on *.* to ‘admin‘@‘10.10.10.1‘identified by ‘123456‘;
为验证账号我们可以在master1的机器上用命令作如下测试
mysql -u admin -p -h 10.10.10.2 -S/tmp/mysql.sock
4、master2上登录数据库记录file 和position
mysql> show master status;
+---------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+---------------+----------+--------------+------------------+
| binlog.000004 | 106 | dragon | |
+---------------+----------+--------------+------------------+
1 row in set (0.00 sec)
5、在master上登录数据库做如下配置
mysql>stop slave;
mysql>CHANGE MASTER TO MASTER_HOST=‘10.10.10.2‘,MASTER_USER=‘admin‘,MASTER_PASSWORD=‘123456‘,MASTER_PORT=3306,MASTER_LOG_FILE=‘binlog.000004 ‘,MASTER_LOG_POS=106; (请注意CHANGE 到pos=106为一行命令)
mysql>start slave;
mysql>show slave status\G;
…
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
…
看到上两个进程为数据库与另一边的master 已经建立连接