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Does this help? <a href=“http://www.bentasker.co.uk/documentation/linux/200-configuring-nginx-to-act-as-a-reverse-proxy-for-phpmyadmin”>http://www.bentasker.co.uk/documentation/linux/200-configuring-nginx-to-act-as-a-reverse-proxy-for-phpmyadmin</a>
Have you tried following the articles available in the DigitalOcean library?