Use multiple Docker containers without exposing ports

documentation sysadmin
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7

Just in case anybody stumbles here for running several Discourse instances behind https://github.com/jwilder/nginx-proxy:

Set discourse to listen on a local link port and tell the proxy to use the container’s internal port 80 like

expose:
  - "127.0.0.1:2836:80"

env:
  VIRTUAL_PORT: '80'
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