欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  IT编程

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

程序员文章站 2024-03-30 20:21:09
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...

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。

总结

以上就是这篇文章的全部内容了,希望本文的内容对大家的学习或者工作具有一定的参考学习价值,如果有疑问大家可以留言交流,谢谢大家对的支持。