A standard JIRA install is a Tomcat with a pre-installed and configured JIRA inside it. I don't think you'll need a WAR distribution to do this, but it would be best to avoid changing anything inside a standard install if possible. What do you need to change to make it work with a WAR?
These are the instructions for Jelastic using an older version of JIRA:
Essentially, you select a Tomcat server, a MySQL DB, and then upload the WAR to the site.
But as of version 7, the WAR version is no longer offered for download.
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