MySQL中报错:Can’t find file: ‘./mysql/plugin.frm’的解决方法
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。
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,谢谢大家对我们的支持。
赞 (0)