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I suggest using the official postgres repository and then using --link yourpostgrescontainer:postgres when you create your JIRA container. When you setup JIRA use postgres:5432 as your postgres address.
That's probably the simplest way to set it up. I personally dislike that the postgres container must be started first so that the linked JIRA container can start. I expose the 5432 port from postgres container and do some docker --add-host trickery in the JIRA container to access it as if it's local.
Thanks! Now just to figure out the easiest way to link this to a Postgresql db. Any tips?