Launch varnish with launchd

org.varnish-cache.varnishd.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
  <key>Label</key>
  <string>org.varnish-cache.varnishd</string>
  <key>ProgramArguments</key>
  <array>
    <string>/usr/local/sbin/varnishd</string>
    <string>-f</string>
    <string>/path/to/varnish.vcl</string>
    <string>-s</string>
    <string>malloc,1G</string>
    <string>-T</string>
    <string>127.0.0.1:2000</string>
    <string>-a</string>
    <string>0.0.0.0:80</string>
  </array>
  <key>KeepAlive</key>
  <true/>
  <key>RunAtLoad</key>
  <true/>
  <key>WorkingDirectory</key>
  <string>/usr/local/sbin</string>
  <key>StandardErrorPath</key>
  <string>/var/log/varnish.log</string>
  <key>StandardOutPath</key>
  <string>/var/log/varnish.log</string>
</dict>
</plist>