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MySQL中报错:Can’t find file: ‘./mysql/plugin.frm’的解决方法

文章目录

[隐藏]

  • 发现问题
  • 解决方法
发现问题

最近在工作中发现了一个问题,这个问题就是MySQL的磁盘满了,将数据库目录data移动到/data3目录,/etc/my.cnf里面也修改了相应的datadir目录,权限也赋予了,但是service mysql start;的时候报错,下面话不多说了,来一起看看详细的解决方法吧。

error log显示如下:

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  

去先检查plugin.frm权限,frm是MySQL表结构定义文件,通常frm文件是不会损坏的,但是如果出现特殊情况出现frm文件损坏也不要放弃希望,当修复MyISAM和InnoDB表时,MySQL服务会首先去调用frm文件,所以我们只能通过修复frm文件进行后面的数据恢复。

然后我们发现plugin.frm有权限,也是mysql属主:

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之后发现,原来问题在os这里,ubatu的mysql通过yum安装或者rpm安装的时候,会建一个/etc/apparmor.d/usr.sbin.mysqld 文件,如果数据目录不在这里面,则会报错,

/usr/sbin/mysqld: Can't find file: ‘./mysql/plugin.frm' (errno: 13 - Permission denied)  
解决方法

所以解决办法是在里面加上新的datadir目录。

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,   #.........这里面写新的datadir目录,写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>  }  

然后重启mysql实例,ok,问题解决。

原文出处:111cn -> http://www.111cn.net/database/151135.htm

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