Exception class: RuntimeException()

ERROR: Cannot connect to MySQL database.
Possible reasons:

• MySQL is not configured propertly in config.lua.
• MySQL server is not running.

SQLSTATE[HY000] [2002] Connection timed out

File: /var/www/site/system/database.php
Line: 113


Backtrace:

#0 /var/www/site/system/init.php(125): require_once()
#1 /var/www/site/index.php(77): require_once('/var/www/site/s...')
#2 {main}