check_time_diff

Q. Why check_time_diff? A. We wanted to check for both broken time synchronisation on both clients and servers in a way that was agnostic about whichever synchronisation mechanism was in use (ntpd, crony, systemd-timesyncd ...) on Linux systems. The plugins that did that were: * check_daytime, rejected because we did not want to install something to listen on the daytime or time ports * check_time, rejected because we did not want to set up ssh for it. Q. Which OSes is check_time_diff known to work with? A. Debian Jessie Q. How to set up on the monitored host (NRPE server)? 1. Install check_time_diff.sh in /usr/lib/nagios/plugins root:root 755 2. Create /etc/nagios/nrpe.d/check_time_diff.cfg with this single line: command[check_time_diff]=/usr/lib/nagios/plugins/check_time_diff.sh -c $ARG2$ -f $ARG3$ -t "$ARG4$" -w $ARG5$ 3. Effect the new configuration by restarting service nagios-nrpe-server Q. How to configure the Nagios server? 1. Create hostgroup no-time-diff by adding these lines to /etc/nagios3/conf.d/hostgroups_nagios2.cfg: define hostgroup { hostgroup_name no-time-diff alias Hosts we do not check time on } 2. Add these lines to /etc/nagios3/conf.d/services_nagios2.cfg, adding any other hostgroups which should not be checked: define service { check_command check_nrpe!check_time_diff!$HOSTALIAS$ 2 iso8601 "$SHORTDATETIME$" 1 service_description Time diff hostgroup_name all, !no-time-diff use generic-service notification_interval 0 } 3. Validate the changed conf: nagios3 -v /etc/nagios3/nagios.cfg 4. Effect the changed conf by restarting service nagios3

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