title: How to setup Varnish logging?
body: <p>I want to get Varnish to log requests. I found the command <code>varnishlog -a -w /var/log/varnish.log</code>, but it does not log anything.</p>
  
  <p>Then I found that Varnish does not write to log by default. However I am unable to find configuration options for logging.</p>