How To Install Varnish 4 on CentOS 7

Varnish is a proxy and cache, or HTTP accelerator, designed to improve performance for busy, dynamic web sites. By redirecting traffic to static pages whenever possible, varnish reduces the number of dynamic page calls, thus reducing load.

 
Step 1: Add the EPEL Repository


Varnish is part of Extra Packages for Enterprise Linux (EPEL), which is a community repository of non-standard packages for the RHEL distribution. First, we’ll install the EPEL repository:

rpm -iUvh http://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-2.noarch.rpm


Step 2: Install Varnish


First, you’ll follow a simple best practice: ensuring the list of available packages is up to date before installing anything new.

yum -y update


At this point, installing Varnish is as simple as running just one command:

yum -y install varnish


Step 3: Start Varnish


To configure varnish to start at boot, run the following command:

systemctl enable varnish


To start varnish, run the following command as root:

systemctl start varnish


To check the status of varnish, run the following command as root:

systemctl status varnish


Check the version of Varnish that is running:

varnishd -V


Varnish is configured to listen on port 6081 by default. It expects your web server to be local, or on the same serve,r and listening on port 8080.


Step 4: Configuration File Locations


A basic and default configuration file can be found at:

/etc/varnish/default.vcl


An example configuration can be found in example.vcl:

/usr/share/doc/varnish-4.0.1/example.vcl


To view or edit example.vcl:

vim /usr/share/doc/varnish-4.0.1/example.vcl

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