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're setting up Varnish in a different environment, some commands are likely different. Consult the preceding documentation for more information.
Confirm your Varnish version
Enter the following command to display the version of Varnish you’re running:
A sample follows:
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 at least 3.0.5 or any version of 4.x before continuing.