CODEWITHSUNDEEP
bash
dtorgo
dtorgo

Reputation: 2106

Detect system reboot/shutdown to avoid false positives with monitoring tools

I have a monitoring tool which checks for a TCP port and then alerts if the port is not listening. I want to make the health check more intelligent so that it does not fire an alert if the system is shutting down / rebooting. I am thinking about doing something like this:

#!/bin/bash
if [ "$(runlevel)" = "2" ] #I use "=" instead of "-eq" because runlevel might be "s"
then
  #do health check
else
  #skip health check
fi

Is there a better way to do this?

Upvotes: 2

Views: 624

Answers (1)

konsolebox
konsolebox

Reputation: 75548

Alternatively you could use a case statement:

case $(runlevel) in
2)
    # do health check
    ;;
s)
    # do other things
    ;;
*)
    # skip doing anything
    ;;
esac

Also using [[ ]] is recommended over [ ] in bash since it doesn't split values of variables with IFS and make them subject to pathname expansion.

if [[ $(runlevel) == 2 ]]

== is somehow is also more readable over just a single = but be careful with adding glob patterns.

Upvotes: 2

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