MySQL 啟動故障 處理 小記

 

       昨天啟動MySQL時，就不太正常，要多重啟幾次，不過能啟動，也就沒放在心上，今天測試測試又出現了問題，MySQL 啟動正常，但是無法關閉：

 

[root@rac2 mysql]# service mysql stop

MySQL server PID file could not befound!                  [FAILED]

[root@rac2 mysql]# ./mysql.server stop

MySQL server PID file could not befound!                  [FAILED]

 

這裡提示的PID 檔案指：/var/lib/mysql/rac2.pid，該檔案和/var/lib/mysql/mysql.sock 檔案一樣，僅在MySQL 運行時存在，後來的驗證如下：

 

[root@rac2 lib]# ls /var/lib/mysql/rac2.pid

/var/lib/mysql/rac2.pid

[root@rac2 lib]# service mysql stop

Shutting down MySQL.                                       [  OK  ]

[root@rac2 lib]# ls /var/lib/mysql/rac2.pid

ls: /var/lib/mysql/rac2.pid: No such fileor directory

 

所以當我的MySQL 運行正常時，應該是存在這個檔案的，google的一個說法是my.cnf 參數檔案的basedir 參數錯誤，注釋掉這個參數即可，但是我都沒有設過這個參數，所以和這個應該沒有關係。

 

查看了一下預設值：

mysql> show variables like '%basedir%';

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

| Variable_name | Value |

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

| basedir       | /usr |

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

1 row in set (0.00 sec)

 

[root@rac2 ~]# ps -ef|grep mysql

root     2161     1  0 09:38 ?        00:00:00 /bin/sh /usr/bin/mysqld_safe--datadir=/var/lib/mysql --pid-file=/var/lib/mysql/rac2.pid

mysql    2418  2161  0 09:38 ?        00:00:00 /usr/sbin/mysqld --basedir=/usr--datadir=/var/lib/mysql --plugin-dir=/usr/lib64/mysql/plugin --user=mysql--log-error=/var/lib/mysql/rac2.err --pid-file=/var/lib/mysql/rac2.pid--socket=/var/lib/mysql/mysql.sock --port=3306

root     3628  3596  0 09:57 pts/1    00:00:00 grep mysql

  

--log資訊

[root@rac2 ~]#cat /var/lib/mysql/rac2.err

111129 9:38:49 [Note] Plugin 'FEDERATED' is disabled.

111129 9:38:49 InnoDB: The InnoDB memory heap is disabled

111129 9:38:49 InnoDB: Mutexes and rw_locks use GCC atomic builtins

111129 9:38:49 InnoDB: Compressed tables use zlib 1.2.3

111129 9:38:49 InnoDB: Using Linux native AIO

111129 9:38:49 InnoDB: Initializing buffer pool, size = 128.0M

111129 9:38:50 InnoDB: Completed initialization of buffer pool

111129 9:38:50 InnoDB: highest supported file format is Barracuda.

111129 9:38:50  InnoDB: Waiting for thebackground threads to start

111129 9:38:51 InnoDB: 1.1.8 started; log sequence number 1605950

111129 9:38:52 [Note] Event Scheduler: Loaded 0 events

111129 9:38:52 [Note] /usr/sbin/mysqld: ready for connections.

Version: '5.5.15-log'  socket: '/var/lib/mysql/mysql.sock'  port: 3306 MySQL Community Server (GPL)

111129 10:50:36 mysqld_safe Starting mysqlddaemon with databases from /var/lib/mysql

111129 10:50:37 [Note] Plugin 'FEDERATED'is disabled.

111129 10:50:37 InnoDB: The InnoDB memoryheap is disabled

111129 10:50:37 InnoDB: Mutexes andrw_locks use GCC atomic builtins

111129 10:50:37 InnoDB: Compressed tablesuse zlib 1.2.3

111129 10:50:37 InnoDB: Using Linux nativeAIO

111129 10:50:37 InnoDB: Initializing bufferpool, size = 128.0M

111129 10:50:37 InnoDB: Completedinitialization of buffer pool

InnoDB: Unable to lock ./ibdata1, error: 11

InnoDB: Check that you do not already haveanother mysqld process

InnoDB: using the same InnoDB data or logfiles.

111129 10:50:37  InnoDB: Retrying to lock the first data file

InnoDB: Unable to lock ./ibdata1, error: 11

InnoDB: Check that you do not already haveanother mysqld process

InnoDB: using the same InnoDB data or logfiles.

…

InnoDB: Check that you do not already haveanother mysqld process

InnoDB: using the same InnoDB data or logfiles.

InnoDB: Unable to lock ./ibdata1, error: 11

InnoDB: Check that you do not already haveanother mysqld process

--這個提示的意思有多個mysqld 進程在運行。

 

 

解決方案：

（1）重新用：ps -ef|grep mySQL 查詢所有的進程，然後把所有的進程kill掉，

（2）重新對相關的目錄賦權

[root@rac2 /]# chown mysql.mysql -R/var/lib/mysql/*

[root@rac2 /]# chmod 755 -R/var/lib/mysql/*

 

--再次啟動成功：

[root@rac2 /]# service mysql start

Starting MySQL......                                       [  OK  ]

[root@rac2 /]# ps -ef|grep mysql

root    27936     1  1 14:08 pts/1    00:00:00 /bin/sh /usr/bin/mysqld_safe--datadir=/var/lib/mysql --pid-file=/var/lib/mysql/rac2.pid

mysql   28193 27936  3 14:08 pts/1    00:00:00 /usr/sbin/mysqld --basedir=/usr--datadir=/var/lib/mysql --plugin-dir=/usr/lib64/mysql/plugin --user=mysql--log-error=/var/lib/mysql/rac2.err --pid-file=/var/lib/mysql/rac2.pid--socket=/var/lib/mysql/mysql.sock --port=3306

root    28220  3596  0 14:08 pts/1    00:00:00 grep mysql

[root@rac2 /]# ll /var/lib/mysql/mysql.sock

srwxrwxrwx 1 mysql mysql 0 Nov 29 14:08/var/lib/mysql/mysql.sock

 

再次查看log：

[root@rac2 lib]#  tail -20 /var/lib/mysql/rac2.err

111129 14:51:53 [Note] Event Scheduler:Purging the queue. 0 events

111129 14:51:53  InnoDB: Starting shutdown...

111129 14:51:54  InnoDB: Shutdown completed; log sequencenumber 1605950

111129 14:51:54 [Note] /usr/sbin/mysqld:Shutdown complete

 

111129 14:51:54 mysqld_safe mysqld from pidfile /var/lib/mysql/rac2.pid ended

111129 14:53:34 mysqld_safe Starting mysqlddaemon with databases from /var/lib/mysql

111129 14:53:34 [Note] Plugin 'FEDERATED'is disabled.

111129 14:53:34 InnoDB: The InnoDB memoryheap is disabled

111129 14:53:34 InnoDB: Mutexes andrw_locks use GCC atomic builtins

111129 14:53:34 InnoDB: Compressed tablesuse zlib 1.2.3

111129 14:53:34 InnoDB: Using Linux nativeAIO

111129 14:53:34 InnoDB: Initializing bufferpool, size = 128.0M

111129 14:53:34 InnoDB: Completed initializationof buffer pool

111129 14:53:35 InnoDB: highest supportedfile format is Barracuda.

111129 14:53:35 InnoDB:1.1.8 started; log sequence number 1605950

111129 14:53:35 [Warning] Neither--relay-log nor --relay-log-index were used; so replication may break when thisMySQL server acts as a slave and has his hostname changed!! Please use'--relay-log=rac2-relay-bin' to avoid this problem.

111129 14:53:35 [Note] Event Scheduler:Loaded 0 events

111129 14:53:35 [Note]/usr/sbin/mysqld: ready for connections.

Version: '5.5.15-log'  socket: '/var/lib/mysql/mysql.sock'  port: 3306 MySQL Community Server (GPL)

[root@rac2 lib]#

 

 

說明：

       因為之前沒有保留的相關資訊，修改之後，雖重複類比多次，都不能還原當時的故障，所有缺少足夠多的一手資料來證明這個問題。但是我這裡的2種方法都可以嘗試一下：

    

MySQL server PID file could not befound!  

--可能是相關目錄的許可權問題導致

 

Check that you do not already have anothermysqld process

--重複進程導致，可以先ps，在kill掉相關進程在重試。

 

 

 

 

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