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6

How to create a cron job to monitor the status of a port ?

rated 0 times [ 6] [ 0] / answers: 1 / hits: 4160 / 2 Years ago, fri, november 4, 2022, 7:52:58

I am trying to create a cron job that would allow me to monitor the status of a particular port and send out notification via email while it changes from listening state to anything else.

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eeperant

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answered 2 Years ago eeperant · Accepted Answer

In the simplest case, you could run a command like this:

lsof -i :22 | grep LISTEN

So, to have that run every 5 minutes and send an email if the port is not listening, add this to your crontab:

*/5 * * * * lsof -i :22 | grep LISTEN || echo "Not listening" | mail [email protected]

This, of course, assumes that you have already set up your machine for the mail command.