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 ]