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Varnish Logs Twice

The default configuration of varnish logs every request twice, once for the client and once for the backend communication

edit the line in /etc/init.d/varnishncsa to something like

DAEMON_OPTS=“-c -a -w $logfile -D -P $pidfile”

from the varnishncsa man page

-c Include log entries which result from communication with a client. If neither -b nor -c is specified, varnishncsa acts as if they both were.