Services

Cron

Cron is a simple time based job scheduler. Cron configuration files (crontabs) can be configured for the system, and for individual users. User crontabs are usually located at /var/spool/cron/crontab. The position of system crontabs varies, but can usually be found under /etc.

It's usually best to stop cron on the entire system using systemd, or sysvinit.

See also:

• DigitalOcean

Apache

• mod-security - sql injection defense

PHP

• PHP Hardening - disable command line execution functions
• Patching PHP vulnerabilities