draco apache2 # apache2ctl --help
(98)Address already in use: make_sock: could not bind to address 0.0.0.0:80
no listening sockets available, shutting down
Unable to open logs

draco apache2 # netstat -plant | grep ':80'
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      5894/apache2        
tcp        0      0 192.168.1.102:80        192.168.1.1:39551       TIME_WAIT   -                   
tcp        0      0 192.168.1.102:80        192.168.1.1:39554       TIME_WAIT   -                   
tcp        0      0 192.168.1.102:80        192.168.1.1:39564       ESTABLISHED 11007/apache2       

draco apache2 # grep -rn 'Listen' /etc/apache2/
/etc/apache2/conf/modules.d/40_mod_ssl.conf:34:Listen 443
/etc/apache2/conf/apache2.conf:96:Listen 80

draco apache2 # whoami 
root