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======How-to: Install, Configure and Troubleshoot Apache HTTP 2.2.3 on CentOS 5======

 This may be applicable to all Apache 2 versions.

 
=====To install Apache Server on CentOS 5:=====

Apache is installed with CentOS 5 by default.

To check if the Apache Server is installed
<code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
#  rpm -q httpd</code>

Or (with yum, you need to be on line)
<code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
# yum groupinfo "Web Server"</code>

If not installed, then install it with:
<code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
# yum install "Web Server"</code>

To install the text-based browser:
<code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
# yum install elinks</code>

To use elinks:
<code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
# elinks 127.0.0.1</code>

To access Apache Server on CentOS 5:

Open a browser and enter:
<code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
http://localhost</code>
=====To configure Apache Server on CentOS 5.=====

You do not need to do any thing to the default configuration httpd.conf file to get your Apache Server running.

All you need is to write your index.html and your web pages and place them in /var/www/html.

The default DocumentRoot is located in /var/www/html.

The default home page is located in /usr/share/doc/HTML/index.html.

The default ServerRoot in httpd.conf is ServerRoot “/etc/httpd”.

Make sure the firewall does not block access to port 80 by running:
<code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
# system-config-securitylevel</code>
<code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
 Allow WWW(HTTP) as "Trusted Services"</code>
<code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
# apachectl start</code>

Configure Apache service to start when the system is rebooted.
<code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
# chkconfig httpd on</code>

Configure Apache Server to restart on CentOS 5
<code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
# apachectl restart</code>
=====Example=====

  - Back up your /etc/httpd/conf/httpd.conf file.
  - Run from the command line:<code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
# system-config-securitylevel</code>

  - <code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
check WWW(HTTP) as Trusted services</code>

  - <code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
# mkdir /var/www/html/test/</code>

  - <code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
# cd /var/www/html/test/</code>

  - <code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
# vi index.html</code>

  - insert(type i) the following:<code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">======Hello======
</code>

  - Save(press Esc then type :wq) the file
  - <code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
# apachectl restart</code>

  - <code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
# chkconfig httpd on</code>

  - <code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
# chcon -R -u system_u /var/www/html/test/</code>

  - <code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
# chcon -R -t httpd_sys_content_t /var/www/html/test/</code>

  - Browse<code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
http://127.0.0.1/test</code>

====Configuring user based security====

To allow only authorized users who have passwords, add the following lines to /etc/httpd/conf/httpd.conf.

Just before the commented option for the UserDir directive:
<code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
       AuthType Basic
       AuthName "Test Passwords"
       AuthUserFile /etc/httpd/passdb
       Require user user1</code>

Test the syntax with one of the followings:
<code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
# httpd -t</code>
<code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
# httpd -S</code>

Restart Apache
<code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
# apachectl restart</code>
====Configuring Passwords====

To create the passwords database passdb in /etc/httpd and add user1 to it run the following command:
<code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
#  htpasswd -c /etc/httpd/passdb user1</code>

To add another user, run the following command without the -c switch(which creates the database):
<code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
#  htpasswd /etc/httpd/passdb user2</code>
====Configuring host based security====

Add the following to the Directory if you want to allow access only to your network. If your network for example is 192.168.1.0:
<code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
# vi /etc/httpd/conf/httpd.conf</code>
<code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
Order allow,deny
       Allow from  192.168.1.0/255.255.255.0</code>
=====Apache Troubleshooting=====

Backup the httpd.conf configuration file.

Make sure Apache is running:
<code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
# service httpd status</code>

If not running, start apache with one of the followings:
<code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
# apachectl start</code>
<code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
# service httpd start</code>

Make sure Apache is running during the boot process with this command:
<code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
# chkconfig httpd on</code>

Test the syntax with one of the followings:
<code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
# httpd -t</code>
<code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
# httpd -S</code>

To view error log file run the following command:
<code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
# tail /var/log/httpd/error_log</code>

To view Access log file run:
<code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
# tail /var/log/httpd/access_log</code>

To restar Apache with out disconnecting the users run :
<code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
# service httpd reload</code>

If you want stop Apache:
<code style="margin-top: 1em; margin-right: 0px; margin-bottom: 1em; margin-left: 0px; padding-top: 1em; padding-right: 1.5em; padding-bottom: 1em; padding-left: 1.5em; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; vertical-align: baseline; overflow-x: auto; overflow-y: auto; width: 600px; background-image: url(http://s2.wp.com/wp-content/themes/pub/motion/images/blacktrans.png); background-attachment: initial; background-origin: initial; background-clip: initial; background-color: initial; font-size: 1.2em; white-space: pre-wrap; background-position: initial initial; background-repeat: initial initial; ">
# apachectl stop</code>
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