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So we have an app. which we wan to run multiple instance of it in linux. The number should be configurable. We also want that whenever one of the instance disappears, a new one is booted up.

I was looking into C based programs, shell script, python script etc. but I was wondering what would be the most simple, easiest way to do it. Are there any tools out there? Can one simply use some linux built-in functionality?

Linux distribution is Red Hat.

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Monit is the tool for the job. With monit, you can control a lot of variables and act upon changes. More info here.

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