The Apache web server is responsible for providing access to dynamic content via the HTTP or HTTPS protocol. In this example, I’m going to install and use the Apache 2 web server + php5 safely and set DocumentRoot to vm05:/exports/html mounted at /var/www/html. You need to type the following commands on vm02 having an IP address

Configure NFS client

Use the yum command to install required NFS client packages:
# yum groupinstall "Network file system client"
OR just install nfs clients:
# yum install nfs-utils nfs4-acl-tools
Turn on the NFSv4 client services:
# chkconfig rpcbind on
# chkconfig rpcidmapd on
# chkconfig nfslock on

/etc/idmapd.conf nfs client configuration

Edit /etc/idmapd.conf, enter:
# vi /etc/idmapd.conf
Make sure it is set as per NFS server domain name:

Domain =
Nobody-User = nobody
Nobody-Group = nobody

Save and close the file. Start all nfs client services, enter:
# /sbin/service rpcbind start
# /sbin/service rpcidmapd start
# /sbin/service nfslock start

Mount file system

Type the following command:
# showmout -e vm05
# showmout -e
Sample outputs:

Export list for v.txvip1:

Mount /exports/html nfs file system at /var/www/html, enter:
# /bin/mount -t nfs4 -orsize=32768,wsize=32768,intr,hard,proto=tcp,sync vm05:/exports/html /var/www/html/
# /bin/mount -t nfs4 -orsize=32768,wsize=32768,intr,hard,proto=tcp,sync /var/www/html/

Mounting NFS file systems using /etc/fstab

Edit /etc/fstab, enter:
# vi /etc/fstab
Append the entry, enter:

vm05:/exports/html    /var/www/html  nfs4   orsize=32768,wsize=32768,intr,hard,proto=tcp,sync

Save and close the file. Make sure netfs service is turned on:
# chkconfig netfs on
Finally, verify that apache user can see files, enter:
# su - apache
$ ls /var/www/html/
$ exit

Please note that root user or any other user may not able to see /var/www/html due to security policy. This is default and only apache user must access DocumentRoot.

Install Apache software

Install the Apache 2 package using yum command, enter:
# yum install httpd

Install required php5 and modules

Type the following command to install php5 and other modules that can provide access to mysql, graphics and much more:
# yum install -y php-pear php-common php-bcmath php-mbstring php-cli php-pdo php-php-gettext php-mcrypt php-gd php-xml php-pecl-apc
php php-mysql php-xmlrpc

Install memcached support for php5

In order to access the memcached server installed on vm3 you need to install memcache server for php:
# yum install -y php-pecl-memcache

Configure Apache

Edit /etc/httpd/conf/httpd.conf, enter:
# vi /etc/httpd/conf/httpd.conf
Add or correct the following directives (DocumentRoot must point to nfs location mounted on /var/www/html):

# allow proxy server communication over lan
# default security avoid info leakage
ServerTokens Prod
ServerSignature Off
# Set DocumentRoot
DocumentRoot "/var/www/html"
<directory "/var/www/html">
   Indexes Includes FollowSymLinks SymLinksifOwnerMatch ExecCGI MultiViews
   Options Indexes FollowSymLinks
   AllowOverride All
   Order allow,deny
   Allow from all

Save and close the file.

PHP5 configuration

PHP is a widely used server-side scripting language. Edit /etc/httpd/conf.d/php.conf, enter:
# cat /etc/httpd/conf.d/php.conf
Sample outputs:

# PHP is an HTML-embedded scripting language which attempts to make it
# easy for developers to write dynamically generated webpages.
<ifModule prefork.c>
  LoadModule php5_module modules/
<ifModule worker.c>
  LoadModule php5_module modules/
# Cause the PHP interpreter to handle files with a .php extension.
AddHandler php5-script .php
AddType text/html .php
# Add index.php to the list of files that will be served as directory
# indexes.
DirectoryIndex index.php
# Uncomment the following line to allow PHP to pretty-print .phps
# files as PHP source code:
#AddType application/x-httpd-php-source .phps

See how to secure and optimize php 5 for more information.

Extract real source IP for forwarded HTTP requests

Install mod_extract_forwarded package to get real source IP for forwarded HTTP requests (turn on EPEL repo):
# yum -y install mod_extract_forwarded package
Edit /etc/httpd/conf.d/mod_extract_forwarded.conf, enter:
# vi /etc/httpd/conf.d/mod_extract_forwarded.conf
Add or correct as follows:

## Accept real ip from our nginx reverse proxy  at ##

Save and close the file. Reload apache web server:
# service httpd reload

Configure iptables to allow access to the web server

Edit /etc/sysconfig/iptables. Add the following lines, ensuring that they appear before the final LOG and DROP lines for the INPUT chain:

## allow only access from lan ##
-A INPUT -m state --state NEW -p tcp -s --dport 80 -j ACCEPT

Save and close the file. Restart the iptables service, enter:
# /sbin/service iptables restart
# /sbin/iptables -L -v -n

Turn on Apache

Start the Apache 2 web server, enter:
# chkconfig httpd on
# service httpd start

Fire a webborwser and type the url:

A note about MySQL database and Memcached server

You need to use mysql database server IP address and tcp port 3306 in your PHP applications:

/* Sample php config */
/* The name of the database for WordPress */
define('DB_NAME', 'foo');
/* MySQL database username */
define('DB_USER', 'bar');
/* MySQL database password */
define('DB_PASSWORD', 'mypassword');
/* MySQL hostname */
define('DB_HOST', '');

You need to use memcached server IP address and tcp port 11211 in your PHP applications:

/* sample php code */
                if ( isset($memcached_servers) )
                        $buckets = $memcached_servers;
                        $buckets = array('default' => array(''));


$config['Datastore']['class'] = 'myApp_MemCached;
$i = 0;
$config['Misc']['memcacheserver'][$i]           = '';
$config['Misc']['memcacheport'][$i]             = 11211;
$config['Misc']['memcachepersistent'][$i]       = true;
$config['Misc']['memcacheweight'][$i]           = 1;
$config['Misc']['memcachetimeout'][$i]          = 1;
$config['Misc']['memcacheretry_interval'][$i] = 15;

🐧 Get the latest tutorials on Linux, Open Source & DevOps via RSS feed or Weekly email newsletter.

🐧 3 comments so far... add one
CategoryList of Unix and Linux commands
Disk space analyzersdf ncdu pydf
File Managementcat tree
FirewallAlpine Awall CentOS 8 OpenSUSE RHEL 8 Ubuntu 16.04 Ubuntu 18.04 Ubuntu 20.04
Network UtilitiesNetHogs dig host ip nmap
OpenVPNCentOS 7 CentOS 8 Debian 10 Debian 8/9 Ubuntu 18.04 Ubuntu 20.04
Package Managerapk apt
Processes Managementbg chroot cron disown fg jobs killall kill pidof pstree pwdx time
Searchinggrep whereis which
User Informationgroups id lastcomm last lid/libuser-lid logname members users whoami who w
WireGuard VPNAlpine CentOS 8 Debian 10 Firewall Ubuntu 20.04
3 comments… add one
  • Jalal Hajigholamali Jun 23, 2012 @ 2:29


    Nice article

  • Gerald Sep 21, 2012 @ 6:16

    Thanks for the article,
    Very Nice Article
    If you could prefix the article with what ip/vm points to what server – it could give more clarity for all.

  • rosada May 11, 2013 @ 17:59

    Thanks for the article,very interesting..
    But,Why if I mount the folder /var/www/html to NFS server, Sudenly the httpd prosess overload?
    Anyone can help?

Leave a Reply

Your email address will not be published.

Use HTML <pre>...</pre> for code samples. Still have questions? Post it on our forum