You can use service discovery tools like Consul or Etcd. Basic idea that on container/app boot, you register your app to service discovery service (you give it

You can use service discovery tools like Consul or Etcd. Basic idea that on container/app boot, you register your app to service discovery service (you give it IP and current port), and it stores information about your all running apps. After you can use consul Nginx integration (it will dynamically generate Nginx config on all updates, and will restart it). Tyk mentioned here also have Consul service integration and much more.