Submitted by blandon on Sun, 09/17/2017 - 21:10
Fastly is a CDN provider that uses Varnish. By changing the CNAME of a sub domain, it is possible to serve a response from Fastly. If a Varnish cache record exists, this is served to the user, if not, Fastly makes a request to the web server (Rackspace) and saves the result for future requests. This allows us to serve all current Varnish requests through a CDN. The advantage of this is that the pages will be delivered much quickly in different locations around the global.
Submitted by blandon on Sun, 09/17/2017 - 20:54
I'm copying our live Varnish config from w4 to our Varnish config in Vagrant (which until now has been relatively untouched). Our w4 Varnish config has had quite a bit of work done on it, so is very different from the out-of-the-box config.
As part of this work, I'll look to refactor, clean up and add comments to the live Varnish config.
Submitted by blandon on Sun, 09/17/2017 - 20:52
Created two new Ubuntu 14 servers at https://mycloud.rackspace.co.uk
Changed root passwords to phoenix10
Rackspace name: api-test-nginx
ip address: 220.127.116.11
Rackspace name: apt-test-varnish
ip address: 18.104.22.168
Created three new A records on the atdtravel.com domain, all pointing at the Nginx server:
Submitted by blandon on Sun, 09/17/2017 - 20:44
Varnish is an HTTP accelerator and caching reverse proxy. It sits in front of Apache and used to serve cached content to anonymous users. This provides a significantly faster page response takes the load of the back-end servers.
Submitted by blandon on Wed, 08/23/2017 - 16:16
You can manually purge URLs from Varnish by running either of the commands below.
In this example, the ATB Contact Us page is removed from the cache:
, using curl (can be run anywhere)
curl -X PURGE --head
, using varnishadm (needs to be run on the Varnish server)
Submitted by blandon on Wed, 08/23/2017 - 16:15