Enable Gzip compression on all account in cPanel server

Gzip compression

Gzip compression helps the webserver to provide the smaller file size and hence the website loads more faster. It will help us to improve the website performance as well as to save the bandwidth.

You need to enable Apache mod_deflate module first in order to enable Gzip compression. You can find the mod_deflate module is enabled on the server by using the following command.

 
root@server [~]# httpd -M | grep deflate
 deflate_module (static)
root@server [~]#

If it is not enabled, you can enable it by running EasyApache.

 
/scripts/easyapache

The mod_deflate module provides the DEFLATE output filter that allows output from your server to be compressed before being sent to the client over the network. You can read more about mod_deflate module from here.

Generally, you can enable Gzip compression on a particular cPanel account by enabling the “Optimize Website” option. Please check the screenshot.

Also, you can enable Gzip compression globally on cPanel server by adding some settings on Apache configuration. The below steps will help you to enable it globally.

Step 1: Login to your WHM.

Login to the server with the root user.

Step 2: Edit Pre VirtualHost

Please go to:

WHM »Service Configuration »Apache Configuration »Include Editor »Pre VirtualHost Include

and select all versions.

Step 3: Add the following on it.

 
<IfModule mod_deflate.c>
 # Insert filter
 SetOutputFilter DEFLATE
 <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
 #
 # Don’t compress images
 SetEnvIfNoCase Request_URI .(?:gif|jpe?g|png)$ no-gzip dont-vary
 </IfModule>
 #
 <IfModule mod_headers.c>
 # Make sure proxies don’t deliver the wrong content
 Header append Vary User-Agent env=!dont-vary
 </IfModule>
</IfModule>

Step 3: Restart Apache

Please restart Apache webservice in order to make the changes in effect.

 
/etc/init.d/httpd restart

Step 4: Verify

You can check the Gzip compression by clicking this link.

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