This article will guide on setting up Solr Admin web interface in Nginx. If you haven't installed Solr in your system, please check this article Step by step guide to setup Apache Solr 5.x in CentOS 7 for Drupal 7 Panopoly distro using Search API. Please follow this guide if you haven't setup your Nginx yet.
Create a domain for Solr, in this guide lets use solr.mywebsite.com. Go to DNS manager and add "solr" as A record for mywebsite.com