Penlog reads webserver log entries from stdin and sends them using UDP to
penlogd. It is intended for Apaches "reliable piped logs".
To use penlog from Apache, add a command
like this to the web servers httpd.conf:
CustomLog "|/usr/local/bin/penlog somehost 10000" common
The optional third argument is used if the server has several addresses.
Penlogd uses the source address to identify the server, and it must be
identical to the address configured in the command line to Pen.