mysql 添加第N个从库
2011-12-15 17:20:47
标签：linux mysql binlog 主从 从库
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某项目mysql服务器 1主 1从 ，现在要添加一个mysql从服务器，要求主库不能停止服务，以前由于不是线上的服务器，可以在主服务器上 执行 flush tables with read lock 语句(锁表,只读)，所有的表只能读不能写，然后再拷贝主库数据到新的从库服务器上，并保持数据一致性，现在只能换一种方法了，思路 新从库2拷贝老的从库1的数据！
老从库1 相关操作:
#1 停止 mysql从库,锁表,
记住 Read_Master_Log_Pos: 与 Master_Log_File: (红色字)
mysql> stop slave;
mysql> flush tables with read lock;
mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State:
Master_Host: 192.168.6.53
Master_User: dongnan
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000097
Read_Master_Log_Pos: 19157395
Relay_Log_File: zabbix-slave-relay-bin.000185
Relay_Log_Pos: 11573578
Relay_Master_Log_File: mysql-bin.000097
Slave_IO_Running: No
Slave_SQL_Running: No
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: 19157395
Relay_Log_Space: 19142103
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: NULL
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
1 row in set (0.00 sec)
ERROR:
No query specified
#2 打包数据并发送到新从库2服务器上
cd /usr/local/mysql/var/
tar czvf zabbix_20110805.tar.gz zabbix/
scp zabbix_20110805.tar.gz root@192.168.6.54:/root
新从库2相关操作:
#1 更改 server-id 值不能为1,因为master 的 server-id=1
vim /etc/my.cnf
server-id = 3
#2 停止mysql数据库并解压缩到/usr/local/mysql/var/
tar zxvf zabbix_20110805.tar.gz -C /usr/local/mysql/var/
#3 启动mysql数据库并change master
Read_Master_Log_Pos 值 19157395
Master_Log_File 值 mysql-bin.000097
mysql> change master to master_host='192.168.6.53',master_user='dongnan',master_password='password',master_log_file='mysql-bin.000097',master_log_pos=19157395;
mysql> slave start; #启动slave
mysql> show slave status\G; #显示slave 状态
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.6.53
Master_User: dongnan
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000097
Read_Master_Log_Pos: 21194359
Relay_Log_File: db1-relay-bin.000002
Relay_Log_Pos: 2037215
Relay_Master_Log_File: mysql-bin.000097
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: 21194359
Relay_Log_Space: 2037368
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:
1 row in set (0.00 sec)
ERROR:
No query specified
验证重库是否同步:
老从库1
mysql> slave start;
mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.6.53
Master_User: dongnan
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000097
Read_Master_Log_Pos: 21194359
Relay_Log_File: db1-relay-bin.000002
Relay_Log_Pos: 2037215
Relay_Master_Log_File: mysql-bin.000097
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
新从库2
mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.6.53
Master_User: dongnan
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000097
Read_Master_Log_Pos: 21194359
Relay_Log_File: db1-relay-bin.000002
Relay_Log_Pos: 2037215
Relay_Master_Log_File: mysql-bin.000097
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
结束
既然主库不能动，那就去操作从库吧，新从库2拷贝老的从库1的数据！
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