This program takes the output from varnishlog on one server, and sends identical HTTP requests to another.

• Very easy to use: just 1 argument to specify the target host
• It keeps the same headers as the original requests.
• It lets you run live production traffic on test servers in real time.
• It does not support POST data.

$ ssh varnish-1.dogs.com
$ vlt varnish-1.staging.dogs.com
2014/05/28 20:04:52 [301] GET http://www.dogs.com/dogs
2014/05/28 20:04:53 [200] GET http://www.dogs.com/dogs/
2014/05/28 20:05:04 [403] GET http://www.dogs.com.au/cats/

Requirements:

• Varnish

$ go build vlt.go

Requirements:

• Go

Similar results can be had with varnishreplay, which is included with varnish. However, VLT has the following improvements:

• Easier to use
• Nicer output
• Supports domain names, not just IP4 addresses