Operating system error number 13 in a file operation

innobackupex 备份时遇到下述错误：

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: os_file_readdir_next_file() returned -1 in directory ./etc, crash recovery may have failed for some .ibd files!
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.
innobackupex: Error: The xtrabackup child process has died at /usr/bin/innobackupex line 2681.

问问google说可能是selinux引起的。

# getenforce  和 ls -Z  检查发现果然是和selinux有关。

生产环境，先关掉selinux，在用chcon去修改selinux文件属性，我想还是算了吧。

切换到root用户，执行备份命令，ok。

拿到备份去做恢复的时候，感觉备份文件比较小。解压一看，发现数据库没备份成功。

 

切换到mysql用户，错误依旧。翻官方文档，原来是my.cnf中没有设置datadir。在my.cnf中设置datadir，备份成功。

 

innobackupex 的错误提示也太不人性了，有待该进啊。