By default Jira runs on a certain port, in this example at port 8090. It is accessible by http://example.com:8090/. This tutorial will make the Jira application available at port 80 with jira as path like: http://example.com/jira. Two configurations are possible, with or without SSL.
Make sure you perform all actions as root.
Change the file /opt/atlassian/jira/conf/server.xml file with:
Search for the part <Service name=”Catalina”> and make it look like: