To configure a server as web server using apache.

you need to install apache but since linux comes with apache you only need to configure httpd.conf file in /usr/local/apache/conf dirrectory. Apache may be install in a different directory on your server

issue a

find / -name httpd.conf

to find the location of your httpd.conf file

you need to configure the httpd.conf with server name, location of html file and some security setting.

more details can be found on www.apache.org

after configuring httpd.conf file you need to restart apache
this can be restart by ./apachectl start

finally issued
ps -ef | grep httpd

To make sure httpd is running