log file
$ sudo vim /etc/default/varnishlog
VARNISHLOG_ENABLED=1
$ sudo /etc/init.d/varnishlog start
* Starting HTTP accelerator log deamon [ OK ]
$ sudo vim /etc/default/varnishncsa
VARNISHNCSA_ENABLED=1
$ sudo /etc/init.d/varnishncsa start
* Starting HTTP accelerator log deamon [ OK ]