systemctl status apache2.service

apache2.service - The Apache Webserver
   Loaded: loaded (/usr/lib/systemd/system/apache2.service; enabled)
   Active: failed (Result: exit-code) since Mon 2014-12-29 00:40:55 EET; 11min ago
  Process: 3206 ExecStop=/usr/sbin/start_apache2 -D SYSTEMD -DFOREGROUND -k graceful-stop (code=exited, status=0/SUCCESS)
  Process: 3189 ExecStart=/usr/sbin/start_apache2 -D SYSTEMD -DFOREGROUND -k start (code=exited, status=1/FAILURE)
 Main PID: 3189 (code=exited, status=1/FAILURE)

Dec 29 00:40:55 lunixegypt.trojan start_apache2[3189]: Check the APACHE_MODULES setting in /etc/sysconfig/apache2.
Dec 29 00:40:55 lunixegypt.trojan start_apache2[3189]: Module "mem_cache" is not installed, ignoring.
Dec 29 00:40:55 lunixegypt.trojan start_apache2[3189]: Check the APACHE_MODULES setting in /etc/sysconfig/apache2.
Dec 29 00:40:55 lunixegypt.trojan start_apache2[3206]: Module "disk_cache" is not installed, ignoring.
Dec 29 00:40:55 lunixegypt.trojan start_apache2[3206]: Check the APACHE_MODULES setting in /etc/sysconfig/apache2.
Dec 29 00:40:55 lunixegypt.trojan start_apache2[3206]: Module "imagemap" is not installed, ignoring.
Dec 29 00:40:55 lunixegypt.trojan start_apache2[3206]: Check the APACHE_MODULES setting in /etc/sysconfig/apache2.
Dec 29 00:40:55 lunixegypt.trojan start_apache2[3206]: Module "mem_cache" is not installed, ignoring.
Dec 29 00:40:55 lunixegypt.trojan start_apache2[3206]: Check the APACHE_MODULES setting in /etc/sysconfig/apache2.
Dec 29 00:40:55 lunixegypt.trojan start_apache2[3206]: httpd (no pid file) not running

lsof -i:80