I am running a web server using nginx but i can see apach2 lines when i type
ps aux | grep apache
The result it looks like this :
www-data 3280 0.0 1.1 99708 45204 ? S 14:11 0:09 /usr/sbin/apache2 -k start
www-data 8651 0.0 0.9 99708 36120 ? S 18:32 0:00 /usr/sbin/apache2 -k start
root 9428 0.0 0.0 3408 764 pts/0 R+ 19:04 0:00 grep --color=auto apache
www-data 23048 0.0 0.0 3728 2172 ? S 04:00 0:00 /usr/bin/ruby /usr/lib/collectd/plugins/apache_ps -h 01-6PMO317H3OSIK
www-data 26491 0.0 1.1 101252 46308 ? S 06:30 0:22 /usr/sbin/apache2 -k start
www-data 26492 0.0 1.2 105120 50316 ? S 06:30 0:23 /usr/sbin/apache2 -k start
www-data 26493 0.0 1.1 99708 46660 ? S 06:30 0:24 /usr/sbin/apache2 -k start
www-data 26494 0.0 1.1 103436 47148 ? S 06:30 0:23 /usr/sbin/apache2 -k start
www-data 26495 0.0 1.2 103304 48524 ? S 06:30 0:22 /usr/sbin/apache2 -k start
www-data 26685 0.0 1.1 99708 45236 ? S 06:38 0:23 /usr/sbin/apache2 -k start
www-data 28435 0.0 1.1 99708 43916 ? S 08:06 0:19 /usr/sbin/apache2 -k start
www-data 30950 0.0 1.1 99716 44672 ? S 10:12 0:16 /usr/sbin/apache2 -k start
root 31480 0.0 0.6 97400 26544 ? Ss 2013 1:22 /usr/sbin/apache2 -k start
What is this about ?
Every line with /usr/sbin/apache2 -k start represents the command that started an apache process with the argument -k start to run a new instant of apache
Apache2 comes by default with many distributions, you can remove it if you only want ngix