There should be some documentations around , but unfortunately I didn't get any or know it whereabouts, so please advise if you have experience based on your JIRA site maintenance:
first of all -
What should I do, as JIRA Admin, to make jira site alive if somehow it is not available to our end users ? troubleshooting approach ?
jira site sitting on linux ; database mysql (on separate server); root access to both available, but not sure about database level access
what kind of backup I should do after the site back to normal ? on which level , database level or just on jira admin level ?
Jira can stop for many reasons, but all of them should be exceptions, and they should all be investigated and fixed, not just automatically restarted without looking to see what went wrong.
Monitor it reactively, and if it reports a failure, check what the problem is so you know how to fix and restart.
To answer the "make it alive" question literally: "(re)start the Jira service".
The problem with that is that if you don't know why it stopped, you have no idea if that might work. So it's a useless answer, because if the problem is severe, Jira will just stop again.
The "troubleshooting approach" is "investigate why it died, and respond accordingly".
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