org.collectd.collectd.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
  <key>Label</key>
  <string>org.collectd.collectd</string>
  <key>ProgramArguments</key>
  <array>
    <string>/opt/local/sbin/collectd</string>
    <string>-f</string>
    <string>-C</string>
    <string>/opt/local/etc/collectd.conf</string>
  </array>
  <key>RunAtLoad</key>
  <true/>
  <key>KeepAlive</key>
  <true/>
</dict>
</plist>

This is a launchd service definition for collectd. Place in /Library/LaunchDaemons and then run "launchctl load org.collectd.collectd.plist".