mod_deflate on cpanel

The following post discuss how to install mod_deflate on cpanel server.  Before going  through here are few advantages of having mod_deflates installed in cpanel server. 🙂

  • Compresses the content  once and saves the result using  less CPU load on  server.
  • It uses level 9 compression because it’s only run once per file.
  • It’s compatible with Apache 1.x, 2.x & 2.2.x versions.
  • In general, all you need to do is enable the module and it works; no core hacking/modifying .htaccess just adding a little configuration via WHM will do all the tricks by enabling it on all the sites.
  • Cpanel do provide an addition option to optimize the size under the cpanel user panels. Sceen-shot is below :

Cpanel Site optimization

1 – > Login in to whm as root ” Software -> EasyApache (Apache updates)” and select the mod_deflate modules under the apache module list page (make sure you have done a httpd.conf before proceeding further) and recompile the apache.

2 -> Once built, you need to tell it to do something. You’ll see a new icon on your sites cPanel now, called “Optimize Site”. You can enable it on a per site basis.

3 -> To enable it on all the sites running in the server, you need to edit the :

  • Apache Configuration
  • Include Editor
  • Select All Versions of Post VirtualHost Include
  • Paste the following below

<IfModule mod_deflate.c>
AddOutputFilterByType  DEFLATE text/html text/plain text/xml

<IfModule mod_setenvif.c>
# Netscape 4.x has some problems…
BrowserMatch ^Mozilla/4 gzip-only-text/html

# Netscape 4.06-4.08 have some more problems
BrowserMatch ^Mozilla/4\.0[678] no-gzip

# MSIE masquerades as Netscape, but it is fine
# BrowserMatch \bMSIE !no-gzip !gzip-only-text/html

# NOTE: Due to a bug in mod_setenvif up to Apache 2.0.48
# the above regex won’t work. You can use the following
# workaround to get the desired effect:
BrowserMatch \bMSI[E] !no-gzip !gzip-only-text/html

# Don’t compress images
SetEnvIfNoCase Request_URI \
\.(?:exe|t?gz|zip|bz2|sit|rar)$ \
no-gzip dont-vary
SetEnvIfNoCase Request_URI \.pdf$ no-gzip dont-vary


<IfModule mod_headers.c>
# Make sure proxies don’t deliver the wrong content
Header append Vary User-Agent env=!dont-vary

This will automatically restart the apache server after saving. After restart try testing the site in the following url :