Keamanan

• Firewall

• Audit log

 apt install auditd audispd-plugins

• Keamanan PHP

php.ini

 # list of function to disable globally #
 disable_functions =exec,passthru,shell_exec,system,proc_open,popen,curl_exec,curl_multi_exec,parse_ini_file,show_source

 allow_url_fopen=Off
 allow_url_include=Off

Atau lebih lengkapnya di

 https://www.cyberciti.biz/faq/linux-unix-apache-lighttpd-phpini-disable-functions/