How to make check_nrpe return UNKNOWN instead of CRITICAL

Question

How can I make NRPE checks return UNKNOWN instead of CRITICAL if unavailable?

When a service is unavailable I don't want it to report as CRITICAL, but rather UNKNOWN.

Answer

You can do that either by adding the flag "-u" the existing check commands that utilizes the plugin "check_nrpe", or create a new check command that includes the flag.

From the help text of check_nrpe: -u = Make socket timeouts return an UNKNOWN state instead of CRITICAL

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How to make check_nrpe return UNKNOWN instead of CRITICAL

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