MySQL umask 导致备份报错
但MySQL对于新创建的数据库目录的权限为 700；数据表文件为660；这可让我们摸不著头脑啦。难道MySQL不依赖系统自己设定的值？参考
备份工具仅限于xtrabackup（2.0+）
umask 大家并不陌生，它设定的文件（目录）的默认权限；一般新创建的目录权限为755，，文件为644；
但MySQL对于新创建的数据库目录的权限为 700；数据表文件为660；这可让我们摸不著头脑啦。难道MySQL不依赖系统自己设定的值？参考文档：MySQL UMASK 决定数据库目录、文件权限是由两个变量UMASK UMASK_DIR 来决定，UMASK 与 Linux中 umask恰好相反，Linux是规定umask 是权限的反向掩码，而UMASK 规定多少其权限就是多少；
可设置UMASK UMASK_DIR 这两个选项来设定MySQL创建文件的默认权限（需重启MySQL）；
为什么MySQL要自己控制一些变量，来实现权限控制（这就不得而知了，可能会安全有关）？
由UMASK 引起的注意事项：
备份：使用xtrabackup 备份的时候，系统用户如果不是 root 或者mysql，它只备份那些有权限进入的数据库目录，没有权限的它还不会报错，ca（如果备份的第一个数据库目录就没有进入权限，就会直接报错）
解决方式：修改数据库目录权限为755，或者更改UMASK_DIR值；
相关阅读：
MySQL备份和恢复具体实施
MySQL备份与恢复的三种方法总结
MySQL备份还原(视图、存储过程)
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