Re: JIRA MIgration from version 3.11 to 4.3.2

>1. Can i install multiple instances of JIRA under a single Tomcat container. 
Yes
See below for pros/cons

>2. For multiple instances, i need to have a different jira.home location. In such a case, do i need to edit the jira-application.properties for each instance and build a WAR for each instance.
Yes, technically you do.  When I was running like this though, I had a script that replaced the file in the .WAR after the standard build, rather than three different versions of the file.  I think you could also use some form of substitution by environment variable, or even possibly override it on the command line.

>3. For multiple instances, do i need to have one license key per instance?
Yes

>4. What are the risks involved in production environment if we have multiple instances running on the same server.
# If you have a resource problem with one of them, it can affect all of them.
# If one of them crashes badly enough to make the JVM or Tomcat unstable, it will affect all of them
# If you need to take one of them out for maintenance/fix/restart etc, you have to  take all of them offline
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Post by broughn2 - online at:
http://forums.atlassian.com/thread.jspa?forumID=46&threadID=55118
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