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