The check_squid monitoring plugin uses the squidclient binary to monitor a Squid proxy.
General
RHEL/CentOS
Just copy the file check_squid
to your Icinga or Nagios plugin directory.
Icinga2
The CheckCommand definition is included in the Icinga Template Library (ITL) for more information about the CheckCommand and the available parameters have a look at the SQUID section in the Icinga2 documentation.
Cyril Feraudet is the orignal author if this plugin. He has published his work on GitHub feraudet/check_squid. In April 2019 the last commit has been pushed to this repository on 20 November 2012.
GPLv2+
See the LICENSE.md for additonal information.