pp_watchdog is a Perl script which monitors configured URLs, and searches for
specified content in the response. If the content is not provided or the
request times out, then a state in a statefile is incremented and a
corresponding recovery-script is called. This script can be an individual
recovery-script for the monitored Web server. An example is provided. The
watchdog also sends an email notification to the admin. The script is safe to
run as a cronjob if timeouts are used for the monitoring and a lockfile is used
to prevent multiple instances. After a 4 unsucsessfull recover attempts, the
script stops trying to respond to the broken server to prevent overloading the
machine.
