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centos6.2，停止mysqld然后修改/etc/my.cnf datadir的位置，启动mysqld提示FAILED，查看日志

代码如下:

120609 11:31:31 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended

120609 11:35:12 mysqld_safe Starting mysqld daemon with databases from /mnt/hgfs/mysql_data

120609 11:35:13 [Warning] Can't create test file /mnt/hgfs/mysql_data/data.lower-test

120609 11:35:13 [Warning] Can't create test file /mnt/hgfs/mysql_data/data.lower-test

/usr/libexec/mysqld: Can't change dir to '/mnt/hgfs/mysql_data/' (Errcode: 13)

120609 11:35:13 [ERROR] Aborting

120609 11:35:13 [Note] /usr/libexec/mysqld: Shutdown complete

120609 11:35:13 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended

新的datadir路径确实没问题，而且目录和目录下所有文件都是777权限，上层目录也有rx权限，只不过datadir和下属文件owner都是root（因为我用虚拟机挂载的windows的文件系统）。后来想到应该是selinux搞的鬼，设置为permissive模式之后正常启动mysqld。

代码如下:

[root@data selinux]# getenforce

Enforcing

[root@data selinux]# setenforce 0

[root@data selinux]# getenforce

Permissive

setenforce 1 设置SELinux 成为enforcing模式

setenforce 0 设置SELinux 成为permissive模式

彻底关闭，vi /etc/selinux/config 修改 SELINUX=disabled

代码如下:

# This file controls the state of SELinux on the system.

# SELINUX= can take one of these three values:

# enforcing - SELinux security policy is enforced.

# permissive - SELinux prints warnings instead of enforcing.

# disabled - No SELinux policy is loaded.

SELINUX=disabled

# SELINUXTYPE= can take one of these two values:

# targeted - Targeted processes are protected,

# mls - Multi Level Security protection.

SELINUXTYPE=targeted

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