一、实现mysql的a-b-b结构

先说ab结构

1

master:

vim /etc/my.cnf

[mysqld]

server_id = 1

slave:

vim /etc/my.cnf

[mysqld]

server_id = 2

2

master:

vim /etc/my.cnf

[mysqld]

server_id = 1

log-bin=binlog

log-bin-index=binlog.index

3

slave:

vim /etc/my.cnf

[mysqld]

server_id = 2

relay_log = /var/lib/mysql/mysql-relay-bin

relay_log_index=/var/lib/mysql/mysql-relay-bin.index

4

master && slave

service mysqld restart

5

master:

mysql> GRANT replication slave ON *.* TO 'username'@'%' identified by 'passwd';

Query OK, 0 rows affected (0.05 sec)

mysql> flush privileges;

Query OK, 0 rows affected (0.00 sec)

##################################################

slave:

cd /var/lib/mysql

rm -fr *

service mysqld restart

master

mysqldump -A -x > /tmp/full.sql

scp /tmp/full.sql root@salveip:/tmp/

slave:

mysql < /tmp/full.sql

********************6******************************

master:

mysql> flush tables with read lock;

mysql> show master status;

+---------------+----------+--------------+------------------+

| File          | Position | Binlog_Do_DB | Binlog_Ignore_DB |

+---------------+----------+--------------+------------------+

| binlog.000003 |      295 |              |                  |

mysql>unlock tables;

6

slave:

mysql> change master to master_host='master的IP地址', master_port=3306, master_user='username', master_password='passwd', master_log_file='binlog.000003',master_log_pos=295;

mysql> start slave;

7

slave:

mysql> show slave status \G

Slave_IO_Running: Yes

Slave_SQL_Running: Yes

至此ab结构就配置完成了

A-B-B主从配置

原理依然是基于最普通的master-slave。就再增加一台slave服务器，即可。

A-B-C主从配置

原理依然是基于最普通的master-slave。 首先建立A-B之间的master-slave。然后建立B-C之间的master-slave， 需要注意的是必须在B的my.cnf配置中加上 log-slave-updates=1，这是为了将中继日志接收到的信息复制到本地的binlog，这样C才能收到更新信息。