There is always time during the holidays to do things that you are pushing in front of you. One of such a thing that I pushed for few months was upgrade of JIRA 5.2.2 and Confluence 4.3.5 to latest versions (6.1.1 and 5.4.1 respectively).
Recently, I needed to install JIRA (5.2.2) and Confluence (4.3.5) on CentOS (6.3). Atlassian documentation is pretty straightforward but I was struggling for some time with my specific configuration that is not so common (I think). Im using Apache as a reverse proxy to JIRA / Confluence tomcats. Jira is running on :8080 and Confluence on :8090. Apache is using SSL and both Tomcats only http.