We would like to have failover for jira Server. Is there a way to do that without data center?
No.
A very big part of high availability is effectively "clustering" - two or more servers doing the same work so that if one fails, the other can pick up the sessions people have with the dying one and carry on.
Another big part of it is having all nodes looking at a single source of data.
Jira Server does not cluster. Jira server requires single exclusive access to the data source (you can't run a second Jira with the same database)
Can we have 2 instances and keep them in sync by any means?
The best you can do is an active/passive failover, which means downtime while you fully shut down the dying node and bring up the failover node.
Can we have 2 instances with shared application data folder and database?
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