An interviewer asked me this question in an interview.
He asked, suppose a service xyz stops due to any reason and you want it running all the time, what will you do so that it will start automatically
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I don't want to be mean but a simple google search will give you a lot of options to do this. Here is one I found:
The easiest way would be to add it to /etc/inittab, which is designed to do this sort of thing:
respawn If the process does not exist, start the process. Do not wait for its termination (continue scanning the /etc/inittab file). Restart the process when it dies. If the process exists, do nothing and continue scanning the /etc/inittab file.
For example, you could do this:
# Run my stuff myprocess:2345:respawn:/bin/myprocess