check_updates is a Nagios plugin to check if RedHat or Fedora system is up-to-date

The plugin uses either YUM, DNF or up2date depending on the operating system.

If you find this plugin useful you can help with a small contribution:


since up2date -l to list the outdated packages can only be run be run by root the plugin must be executed as root. Plese configure sudo as follows:

nagios ALL= NOPASSWD: /usr/sbin/up2date -l

and execute the plugin with sudo

sudo $INSTALLATION_PATH/check_updates


DNF uses different caches pro user. This has the consequence that DNF and the plugin will potentially deliver different results for different users.

YUM security plugin

Use one of the following commands to install the YUM security plugin: