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How to enable gzip compression in Apache on Plesk server?

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Dinara Aspembitova
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Applicable to:

  • Plesk for Linux

Question

How to enable gzip compression in Apache?

Answer

Using Plesk interface

  1. Log into Plesk.

  2. Make sure that 'deflate' module is present and enabled in Tools & Settings > Apache Web Server. For Apache 2.4 version, on CentOS 7, Ubuntu 14/16, Debian 7/8/9, 'filter' module should be also enabled.

    Untitled.png

  3. Go to Domains > example.com > File Manager and open the .htaccess file.
  4. Add the following content to the bottom of the file:

    CONFIG_TEXT: <IfModule mod_deflate.c>
    AddOutputFilterByType DEFLATE application/javascript
    AddOutputFilterByType DEFLATE application/rss+xml
    AddOutputFilterByType DEFLATE application/vnd.ms-fontobject
    AddOutputFilterByType DEFLATE application/x-font
    AddOutputFilterByType DEFLATE application/x-font-opentype
    AddOutputFilterByType DEFLATE application/x-font-otf
    AddOutputFilterByType DEFLATE application/x-font-truetype
    AddOutputFilterByType DEFLATE application/x-font-ttf
    AddOutputFilterByType DEFLATE application/x-javascript
    AddOutputFilterByType DEFLATE application/xhtml+xml
    AddOutputFilterByType DEFLATE application/xml
    AddOutputFilterByType DEFLATE font/opentype
    AddOutputFilterByType DEFLATE font/otf
    AddOutputFilterByType DEFLATE font/ttf
    AddOutputFilterByType DEFLATE image/svg+xml
    AddOutputFilterByType DEFLATE image/x-icon
    AddOutputFilterByType DEFLATE text/css
    AddOutputFilterByType DEFLATE text/html
    AddOutputFilterByType DEFLATE text/javascript
    AddOutputFilterByType DEFLATE text/plain
    AddOutputFilterByType DEFLATE text/xml

    BrowserMatch ^Mozilla/4 gzip-only-text/html
    BrowserMatch ^Mozilla/4\.0[678] no-gzip
    BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
    Header append Vary User-Agent
    </IfModule> 

        Untitled.png

Enable server-wide gzip compression using SSH connection

  1. Connect to the server via SSH

    Note: if direct SSH access to the server is not possible, contact server administrator for further assistance.

  2. Make sure that module mod_deflate is enabled in apache:

    # httpd -M | grep deflate
    deflate_module (shared)

  3. Create a file deflate.conf in /etc/httpd/conf.d:

    # vi /etc/httpd/conf.d/deflate.conf

  4. Add the following into the file:

    CONFIG_TEXT: <IfModule mod_deflate.c>
    # Compress HTML, CSS, JavaScript, Text, XML and fonts
    AddOutputFilterByType DEFLATE application/javascript
    AddOutputFilterByType DEFLATE application/rss+xml
    AddOutputFilterByType DEFLATE application/vnd.ms-fontobject
    AddOutputFilterByType DEFLATE application/x-font
    AddOutputFilterByType DEFLATE application/x-font-opentype
    AddOutputFilterByType DEFLATE application/x-font-otf
    AddOutputFilterByType DEFLATE application/x-font-truetype
    AddOutputFilterByType DEFLATE application/x-font-ttf
    AddOutputFilterByType DEFLATE application/x-javascript
    AddOutputFilterByType DEFLATE application/xhtml+xml
    AddOutputFilterByType DEFLATE application/xml
    AddOutputFilterByType DEFLATE font/opentype
    AddOutputFilterByType DEFLATE font/otf
    AddOutputFilterByType DEFLATE font/ttf
    AddOutputFilterByType DEFLATE image/svg+xml
    AddOutputFilterByType DEFLATE image/x-icon
    AddOutputFilterByType DEFLATE text/css
    AddOutputFilterByType DEFLATE text/html
    AddOutputFilterByType DEFLATE text/javascript
    AddOutputFilterByType DEFLATE text/plain
    AddOutputFilterByType DEFLATE text/xml
    # Remove browser bugs (only needed for really old browsers)
    BrowserMatch ^Mozilla/4 gzip-only-text/html
    BrowserMatch ^Mozilla/4.0[678] no-gzip
    BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
    Header append Vary User-Agent
    </IfModule>

  5. Note in case of Centos OS, if the server has Apache 2.4 (httpd-2.4), the following module should be enabled:

    # grep -ir "mod_filter.so" /etc/httpd/conf.modules.d/00-base.conf
    LoadModule filter_module modules/mod_filter.so

    In case of Debian and Ubuntu, check that the filter module is enabled:

    # apachectl -M | grep filter
    filter_module (shared)

  6. Restart apache:

    # service httpd restart

Note: On Debian and Ubuntu the service is named apache2 instead of httpd, the list of all modules is called using apache2ctl utility and the path for deflate.conf file is /etc/apache2/mods-available/ instead of /etc/httpd/conf.d/

Comments

5 comments

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  • Avatar
    Mattia Gregolin

    Thank you. This was very helpful for my Amazon Ec2 instance!

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  • Avatar
    Deyvi Arellano

    Disculpa pero cuando realizo lo siguiente me deja de funcionar apache! 

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  • Avatar
    Alexandr Tumanov

    @Deyvi,

    Could you please share the information about the error? Apache version? The article was verified and no errors with apache were found.

    0
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  • Avatar
    Gianluca (Edited )

    Please correct the row number two on the ssh code section:

    # Compress HTML, CSS, JavaScript, Text, XML and fonts AddOutputFilterByType DEFLATE application/javascript

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  • Avatar
    Ivan Postnikov

    Hello @Gianluca,

    Thank you for noticing. The article was updated.

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