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Ubuntu上的MySQL出現Can't create/write to file

最近遇到一個問題如下:

/usr/sbin/mysqld: Can't create/write to file '/mysqltmp/ibXc3yTC' (Errcode: 13)
170619  3:32:30  InnoDB: Error: unable to create temporary file; errno: 13
170619  3:32:30 [ERROR] Plugin 'InnoDB' init function returned error.
170619  3:32:30 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
170619  3:32:30 [ERROR] Unknown/unsupported storage engine: InnoDB
170619  3:32:30 [ERROR] Aborting

追蹤流程:
先查 MySQL ErrorCode:13
發現是權限被拒,因此就是資料夾權限問題

這時查看一下權限
drwxrwxrwx   2 root root  4096 Jun 19 03:33 mysqltmp

發現已經是 777 如果不是,就執行以下動作,mysqltmp是資料夾名哦
chown roor.roor mysqltmp
chmod 777 mysqltmp

 再執行一次,仍然不行,因此繼續找其他權限控制的軟體。
發現在 /etc/apparmor.d/usr.sbin.mysqld 有權限限制的設定

因此就在此檔案裡加上
/mysqltmp r,
/mysqltmp/** rw,

接著重新載入設定檔
sudo apparmor_parser -r /etc/apparmor.d/usr.sbin.mysqld

這時再啟動MySQL應該就會成功了 :D

參考資料:

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