Disable IPv6 – CentOS 7
Disabling IPv6 on CentOS 7 is pretty straight forward. You should make sure you aren't…
Installing Varnish on CentOS 7.2 is pretty straight forward, start off by adding the epel-release repo.
With the repo added install Varnish
Start Varnish at startup
That’s it, you’ve installed varnish, started the service and added the service to OS startup.
You’ll now need to configure Varnish, the configurations files are located at /etc/varnish