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MySQL移动数据目录出现权限问题

2017-04-25 10:37 639 查看

MySQL移动数据目录出现权限问题

环境: ubuntu 14.04.4 LTS

现象

今天把/var/lib/mysql下的数据文件移动到其他目录下,之后发现启动mysql报错,并且mysql无法运行。具体的操作如下

# service mysql stop
# mv /var/lib/mysql /data
# serivce mysql start

报出的错误信息为:

170425  9:55:36 [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.
170425  9:55:36 [Note] Plugin 'FEDERATED' is disabled.
/usr/sbin/mysqld: Can't find file: './mysql/plugin.frm' (errno: 13)
170425  9:55:36 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.
170425  9:55:36 InnoDB: The InnoDB memory heap is disabled
170425  9:55:36 InnoDB: Mutexes and rw_locks use GCC atomic builtins
170425  9:55:36 InnoDB: Compressed tables use zlib 1.2.8
170425  9:55:36 InnoDB: Using Linux native AIO
170425  9:55:36 InnoDB: Initializing buffer pool, size = 128.0M
170425  9:55:36 InnoDB: Completed initialization of buffer pool
170425  9:55:36  InnoDB: Operating system error number 13 in a file operation.
InnoDB: The error means mysqld does not have the access rights to
InnoDB: the directory.
InnoDB: File name ./ibdata1
InnoDB: File operation call: 'open'.
InnoDB: Cannot continue operation.

原因

最初以为是简单的权限问题,就把/data/mysql目录赋权给mysql用户

# chown -R mysql:mysql /data/mysql

但是再次启动mysql后,还是遇到同样的错误。上网查了一下,原因是由于现今的Linux系统都采用AppArmor来限制文件和目录的执行权限。

解决办法

所以需要配置AppArmor让mysqld可以访问/data/mysql目录。具体操作如下:

# vi /etc/apparmor.d/usr.sbin.mysqld

在此文件末尾增加你的目录(可以按照/var/lib/mysql的目录改)

/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,

/etc/hosts.allow r,
/etc/hosts.deny r,

/etc/mysql/*.pem r,
/etc/mysql/conf.d/ r,
/etc/mysql/conf.d/* r,
/etc/mysql/*.cnf r,
/usr/lib/mysql/plugin/ r,
/usr/lib/mysql/plugin/*.so* mr,
/usr/sbin/mysqld mr,
/usr/share/mysql/** r,
/var/log/mysql.log rw,
/var/log/mysql.err rw,
/var/lib/mysql/ r,
/var/lib/mysql/** rwk,
/var/lib/mysql-files/ r,
/var/lib/mysql-files/** rwk,
/var/log/mysql/ r,
/var/log/mysql/* rw,
/var/run/mysqld/mysqld.pid rw,
/var/run/mysqld/mysqld.sock w,
/run/mysqld/mysqld.pid rw,
/run/mysqld/mysqld.sock w,

/sys/devices/system/cpu/ r,
# Site-specific additions and overrides. See local/README for details.
#include <local/usr.sbin.mysqld>
/data/mysql/ r,
/data/mysql/** rwk,
}

如果不写第一句的

/data/mysql/ r
,则mysql能启动,但是进入mysql后输入命令会提示下面错误:

ERROR 1018 (HY000): Can't read dir of '.' (errno: 13

@完

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