I have a 2 node Jira DC installation. There is a Change that needs to be done to the authentication, via a 3rd party app.
My question: Can I isolate a single node, make the configuration alterations, test it, then once happy, turn off the isolation and thus update the whole cluster with zero downtime?
while the information on the knowledbase suggest that you do not need to do something special...
You will not need to stop the cluster, or bring down any nodes to install or update an app.
... I would spin up a tiny virtual machine, do the testing with a completely non-production environment and probably delete it afterwards.
Testing on a single node of the cluster might look easier but roll-back in case thing go wrong perhaps isn't.
In case the documentation on creating a test environment is of interest for you here is the link:
In summary: when tasked with this requirement I would test on a very separate environment first.
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