Mmm, good point - that doc used to be "this is how you do a cold standby" and then "and this is how you make it better with data centre", but it's now just a DC doc.
There is no official doc, as it's not supported by Atlassian, but I know I've set it up loads of times for all the reasons you've asked.
In most cases, it's been a variation on:
When you need failover:
I'd agree with Nic - kind of a poor man's standby solution i've seen is two mirrored application servers replicating folders. The standby being shutdown Jira.
Then the database server is doing the same thing. active / passive.
You do have to either manually intervene. If you lose an app server, turn on the secondary and repoint - or perhaps you have Nginx already setup so it will direct traffic to whatever node is available.
You could write a script to make it a button push, but these techniques you'll be down for minutes/hours - not days.
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