Mysql服务器的主辅数据同步
例题：将A服务器作为主服务器（Master），B1和B2为辅服务器（Slave），
怎么来将主服务器的数据同步到辅服务器呢，下面我们来看。
Master:
修改配置文件：/etc/my.cnf
[root@localhost ~]# vim /etc/my.cnf
[mysqld]
log-bin=binlog
log-bin-index=binlog.index
sync_binlog=0
server_id = 1
重启mysql： www.bitsCN.com
[root@localhost ~]# /etc/init.d/mysqld restart
停止 MySQL： [确定]
启动 MySQL： [确定]
[root@localhost ~]#
Slave1：
修改配置文件：/etc/my.cnf
[root@localhost ~]# 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
重启mysql：
[root@localhost ~]# /etc/init.d/mysqld restart
停止 MySQL： [确定]
启动 MySQL： [确定]
[root@localhost ~]#
Slave2：
修改配置文件：/etc/my.cnf
[root@localhost ~]# vim /etc/my.cnf
[mysqld]
server_id = 3
relay_log = /var/lib/mysql/mysql-relay-bin
relay_log_index=/var/lib/mysql/mysql-relay-bin.index
重启mysql：
[root@localhost ~]# /etc/init.d/mysqld restart
停止 MySQL： [确定] www.bitsCN.com
启动 MySQL： [确定]
[root@localhost ~]#
Master：
[root@localhost ~]# mysql
Welcome to the MySQL monitor. Commands end with ; or /g.
Your MySQL connection id is 2
Server version: 5.0.77-log Source distribution
Type 'help;' or '/h' for help. Type '/c' to clear the buffer.
mysql> GRANT replication slave ON *.* TO 'ab'@'%' identified by '123';
Query OK, 0 rows affected (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
Slave1：
[root@localhost ~]# cd /var/lib/mysql/
[root@localhost mysql]# ls
ibdata1 ib_logfile0 ib_logfile1 mysql mysql.sock test
[root@localhost mysql]# rm -rf *
[root@localhost mysql]# ls
[root@localhost mysql]# /etc/init.d/mysqld restart
Master：
[root@localhost ~]# mysqldump -A -x > /tmp/full.sql
[root@localhost ~]# scp /tmp/full.sql root@192.168.18.117:/tmp/
The authenticity of host '192.168.18.117 (192.168.18.117)' can't be established.
RSA key fingerprint is 1f:ce:39:33:61:f5:7d:f8:0b:89:c7:d8:06:46:79:1f.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.18.117' (RSA) to the list of known hosts.
root@192.168.18.117's password:
full.sql 100% 1039MB 4.8MB/s 03:35
[root@localhost ~]#
Slave1：
[root@localhost mysql]# mysql < /tmp/full.sql
Master:
mysql> flush tables with read lock;
mysql> show master status;
+---------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+---------------+----------+--------------+------------------+
| binlog.000003 | 365 | | |
+---------------+----------+--------------+------------------+
1 row in set (0.03 sec)
mysql> unlock tables;
Query OK, 0 rows affected (0.03 sec)
Slave1：
mysql> change master to master_host='192.168.18.107', master_port=3306, master_user='ab', master_password='123', master_log_file='binlog.000003',master_log_pos=365;
Query OK, 0 rows affected (0.06 sec)
mysql> start slave;
Query OK, 0 rows affected (0.00 sec)
mysql> show slave status /G
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Slave1：
[root@localhost ~]# mysqldump -A -x > /tmp/mysql.sql
[root@localhost ~]# scp /tmp/mysql.sql root@192.168.18.127:/tmp/
The authenticity of host '192.168.18.127 (192.168.18.127)' can't be established.
RSA key fingerprint is f7:a5:9e:2f:86:57:a5:17:f4:ad:2b:3a:a8:55:0f:76.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.18.127' (RSA) to the list of known hosts.
root@192.168.18.127's password:
mysql.sql 100% 1039MB 20.8MB/s 00:50
[root@localhost mysql]#
Slave2：
[root@localhost mysql]# mysql < /tmp/mysql.sql
Master:
mysql> flush tables with read lock;
Query OK, 0 rows affected (0.00 sec)
mysql> show master status;
+---------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+---------------+----------+--------------+------------------+
| binlog.000003 | 365 | | |
+---------------+----------+--------------+------------------+
1 row in set (0.00 sec)
mysql> unlock tables;
Query OK, 0 rows affected (0.00 sec)
Slave2：
mysql> change master to master_host='192.168.18.107', master_port=3306, master_user='ab', master_password='123', master_log_file='binlog.000003',master_log_pos=365;
Query OK, 0 rows affected (0.05 sec)
mysql> start slave;
Query OK, 0 rows affected (0.00 sec)
测试：
mysql> show slave status /G
在出结果的数据中，以下语句为yes成功
Slave_IO_Running: Yes
Slave_SQL_Running: Yes