basic tutorials can be found here:
Hope it helps,
Those tutorials are ment to give you a clue how JIRA and nginx configuration works and can be set. They are not step-by-step tutorials to fully follow.
For you, I think, it would be better to check the second tutorial http://blog.servicerocket.com/adoption/blog/2014/07/3-steps-in-set-up-nginx-as-proxy-server-for-atlassian-jira
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