MySQL复制是好的,但是由于错误可能会停止,并且恢复工作复制可能很困难 - 您需要在主服务器上设置锁以获得一致的MySQL转储,并且在此期间网站不可访问。 但是,有一种方法可以使用slave-skip-errors
伪指令忽略某些错误。
1初步说明
使用从属跳过错误,
您可以使复制从站忽略某些错误代码(您可以在这里找到MySQL错误代码列表: 服务器错误代码和消息 )。 但是,您应该谨慎使用 - 它应该是您最后一个尝试恢复复制的工具,因为它可能使您的从站不一致。 您应该首先尝试以下方法之一: 如何修复MySQL复制或使用slave的my.cnf
文件中的replicate-ignore-db或replicate-ignore-table语句来跳过导致复制失败的数据库/数据库表的复制(if您不需要这些数据库/数据库表的复制)。
2使用从属跳过错误
我们假设复制已经停止了,你在Minion的MySQL shell上得到这样的东西:
SHOW SLAVE STATUS \G
mysql> SHOW SLAVE STATUS \G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 1.2.3.4
Master_User: slave_user
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000024
Read_Master_Log_Pos: 933201702
Relay_Log_File: mysqld-relay-bin.000113
Relay_Log_Pos: 63519994
Relay_Master_Log_File: mysql-bin.000021
Slave_IO_Running: Yes
Slave_SQL_Running: No
Replicate_Do_DB:
Replicate_Ignore_DB: mysql,information_schema,performance_schema,test
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 1054
Last_Error: Error 'Unknown column 'tx_feuserbranch_agb' in 'field list'' on query. Default database: 'dbtest'.
Query: 'INSERT INTO fe_users (email,first_name,last_name,address,ip,city,country,telephone,fax,company,tx_feuserbranch_brancha,
tx_feuserbranch_customernr,tx_feuserbranch_agb,username,password,name,usergroup,disable,by_invitation,tx_srfeuserregister_password,
tstap,crdate,cruser_id,fe_cruser_id,pid) VALUES ('test333@example.com','John','Doe','test','55555','test','Deutschland','49111111111',
'','test','0','55','on','test333@example.com','xxxxxxxxxxxxxx','John Doe','0','1','0','','1361359747','1361359747','0','0','33')'
Skip_Counter: 0
Exec_Master_Log_Pos: 120460827
Relay_Log_Space: 3500841420
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: Yes
Master_SSL_CA_File: /etc/mysql/newcerts/ca-cert.pem
Master_SSL_CA_Path:
Master_SSL_Cert: /etc/mysql/newcerts/client-cert.pem
Master_SSL_Cipher:
Master_SSL_Key: /etc/mysql/newcerts/client-key.pem
Seconds_Behind_Master: NULL
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 1054
Last_SQL_Error: Last_Error: Error 'Unknown column 'tx_feuserbranch_agb' in 'field list'' on query. Default database: 'dbtest'.
Query: 'INSERT INTO fe_users (email,first_name,last_name,address,ip,city,country,telephone,fax,company,tx_feuserbranch_brancha,
tx_feuserbranch_customernr,tx_feuserbranch_agb,username,password,name,usergroup,disable,by_invitation,tx_srfeuserregister_password,
tstap,crdate,cruser_id,fe_cruser_id,pid) VALUES ('test333@example.com','John','Doe','test','55555','test','Deutschland','49111111111',
'','test','0','55','on','test333@example.com','xxxxxxxxxxxxxx','John Doe','0','1','0','','1361359747','1361359747','0','0','33')'
Replicate_Ignore_Server_Ids:
Master_Server_Id: 1
1 row in set (0.00 sec)
mysql>
正如您在Last_Errno
行中可以看到的,导致复制停止的错误的错误代码为1054( '%s'中的未知列'%s'
)。 如果你想让MySQL从机忽略这样的错误,只需打开你的my.cnf(在Debian和Ubuntu上,它是/etc/mysql/my.cnf
)...
vi /etc/mysql/my.cnf
...并添加line slave-skip-errors = 1054
:
[...] expire_logs_days = 10 max_binlog_size = 100M server-id=2 replicate-ignore-db = mysql replicate-ignore-db = information_schema replicate-ignore-db = performance_schema replicate-ignore-db = test slave-skip-errors = 1054 [...] |
之后重启MySQL:
/etc/init.d/mysql restart
再次登录MySQL
mysql -u root -p
...并再次检查Minion的状态 - 现在应该再次工作:
SHOW SLAVE STATUS \G
要让从设备忽略多个错误代码,只需用逗号分隔:
slave-skip-errors = 1062,1054
您可以在这里找到MySQL错误代码列表: 服务器错误代码和消息