MySQL中報錯:Can’t find file: ‘./mysql/plugin.frm’的解決方法
發(fā)現(xiàn)問題
最近在工作中發(fā)現(xiàn)了一個問題,這個問題就是MySQL的磁盤滿了,將數(shù)據(jù)庫目錄data移動到/data3目錄,/etc/my.cnf里面也修改了相應的datadir目錄,權限也賦予了,但是service mysql start;的時候報錯,下面話不多說了,來一起看看詳細的解決方法吧。
error log顯示如下:
2017-09-15 16:01:01 2420 [Warning] Using unique option prefix myisam-recover instead of myisam-recover-options is deprecated and will be removed in a future release. Please use the full name instead. 2017-09-15 16:01:01 2420 [Note] Plugin 'FEDERATED' is disabled. ^G/usr/sbin/mysqld: Can't find file: './mysql/plugin.frm' (errno: 13 - Permission denied) 2017-09-15 16:01:01 2420 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it. 2017-09-15 16:01:01 2420 [Note] InnoDB: Using atomics to ref count buffer pool pages 2017-09-15 16:01:01 2420 [Note] InnoDB: The InnoDB memory heap is disabled 2017-09-15 16:01:01 2420 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins 2017-09-15 16:01:01 2420 [Note] InnoDB: Memory barrier is not used 2017-09-15 16:01:01 2420 [Note] InnoDB: Compressed tables use zlib 1.2.8 2017-09-15 16:01:01 2420 [Note] InnoDB: Using Linux native AIO 2017-09-15 16:01:01 2420 [Note] InnoDB: Using CPU crc32 instructions 2017-09-15 16:01:01 2420 [Note] InnoDB: Initializing buffer pool, size = 128.0M 2017-09-15 16:01:02 2420 [Note] InnoDB: Completed initialization of buffer pool 2017-09-15 16:01:02 2420 [ERROR] InnoDB: ./ibdata1 can't be opened in read-write mode 2017-09-15 16:01:02 2420 [ERROR] InnoDB: The system tablespace must be writable! 2017-09-15 16:01:02 2420 [ERROR] Plugin 'InnoDB' init function returned error. 2017-09-15 16:01:02 2420 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed. 2017-09-15 16:01:02 2420 [ERROR] Unknown/unsupported storage engine: InnoDB 2017-09-15 16:01:02 2420 [ERROR] Aborting
去先檢查plugin.frm權限,frm是MySQL表結構定義文件,通常frm文件是不會損壞的,但是如果出現(xiàn)特殊情況出現(xiàn)frm文件損壞也不要放棄希望,當修復MyISAM和InnoDB表時,MySQL服務會首先去調用frm文件,所以我們只能通過修復frm文件進行后面的數(shù)據(jù)恢復。
然后我們發(fā)現(xiàn)plugin.frm有權限,也是mysql屬主:
root@hutaojie-1-pdd-sh:/data1/mysql/mysql# ll plugin.* -rwxrwxrwx 1 mysql mysql 8586 Mar 6 2016 plugin.frm* -rwxrwx--x 1 mysql mysql 116 Mar 6 2016 plugin.MYD* -rwxrwx--x 1 mysql mysql 2048 Mar 6 2016 plugin.MYI* root@hutaojie-1-pdd-sh:/data1/mysql/mysql#
google之后發(fā)現(xiàn),原來問題在os這里,ubatu的mysql通過yum安裝或者rpm安裝的時候,會建一個/etc/apparmor.d/usr.sbin.mysqld 文件,如果數(shù)據(jù)目錄不在這里面,則會報錯,
/usr/sbin/mysqld: Can't find file: ‘./mysql/plugin.frm' (errno: 13 - Permission denied)
解決方法
所以解決辦法是在里面加上新的datadir目錄。
root@huayuan:/var/lib# vim /etc/apparmor.d/usr.sbin.mysqld
# vim:syntax=apparmor
# Last Modified: Tue Jun 19 17:37:30 2007
#include <tunables/global>
/usr/sbin/mysqld {
#include <abstractions/base>
#include <abstractions/nameservice>
#include <abstractions/user-tmp>
#include <abstractions/mysql>
#include <abstractions/winbind>
capability dac_override,
capability sys_resource,
capability setgid,
capability setuid,
network tcp,
/run/mysqld/mysqld.pid rw,
/run/mysqld/mysqld.sock w,
/sys/devices/system/cpu/ r,
#.........這里面寫新的datadir目錄,寫2行,一行r,一行rwk。
/data3/mysql/ r,
/data3/mysql/** rwk,
# Site-specific additions and overrides. See local/README for details.
#include <local/usr.sbin.mysqld>
}
然后重啟mysql實例,ok,問題解決。
總結
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