mysql - 无法重新启动mysql

我为 DigitalOcean 托管的 WordPress 网站建立数据库连接时出错。所以我检查了数据库出了什么问题。

sudo/etc/init.d/mysql restart 返回

stop: Unknown instance: 
start: Job failed to start

df -h/ 返回以下内容，因此磁盘未满？

Filesystem                 Size  Used Avail Use% Mounted on
/dev/disk/by-label/DOROOT   20G   12G  6.9G  63% /

sudo -u mysql mysqld 返回

170828  4:33:48 [Warning] Using unique option prefix key_buffer instead of key_buffer_size is deprecated and will be removed in a future release. Please use the full name instead.
170828  4:33:48 [Note] mysqld (mysqld 5.5.52-0ubuntu0.14.04.1) starting as process 18825 ...

mysqld 返回

170828  4:34:17 [Warning] Using unique option prefix key_buffer instead of key_buffer_size is deprecated and will be removed in a future release. Please use the full name instead.
170828  4:34:17 [Note] mysqld (mysqld 5.5.52-0ubuntu0.14.04.1) starting as process 18866 ...
170828  4:34:17 [Warning] Can't create test file /var/lib/mysql/chengtie.lower-test
170828  4:34:17 [Warning] Can't create test file /var/lib/mysql/chengtie.lower-test
mysqld: Can't change dir to '/var/lib/mysql/' (Errcode: 13)
170828  4:34:17 [ERROR] Aborting

170828  4:34:17 [Note] mysqld: Shutdown complete

有谁知道mysql出了什么问题吗？我怎样才能重新启动它？

编辑 1: 我注意到 config.inc.php 或 config.sample.inc.php 下没有 /var/lib/mysql/phpmyadmin。

最佳答案

您看过这篇文章吗:Ubuntu - 12.04 - MySql won't start by using service mysql start

您可以尝试