Installing the Varnish software is beyond the scope of this guide. For more information about installing Varnish, see:
This topic is written for Varnish on CentOS and Apache 2.2. If you are setting up Varnish in a different environment, some commands are likely different. Consult the preceding documentation for more information.
If you intend to install Varnish modules (vmods), such as saint mode, you should install Varnish by compiling the code, rather than installing from a package. See Saint mode for more details.
Confirm your Varnish version
Enter the following command to display the version of Varnish you are running:
1 varnishd -V
A sample follows:
1 2 3 varnishd (varnish-4.0.3 revision b8c4a34) Copyright (c) 2006 Verdens Gang AS Copyright (c) 2006-2014 Varnish Software AS
Make sure the version is 4.x, 5.2 or 6.x before continuing. If you are running version 3.x, you must upgrade to a supported version. Consult the Varnish installation documentation for more information.