Using Let's Encrypt with Distillery 2 and phoenix 1.4 without nginx

Questions & Help Questions
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If you don’t want to deal with serving Acme challenges through Phoenix, you can use standalone mode: User Guide — Certbot 5.7.0.dev0 documentation

This will generate certificates in /etc/letsencrypt/live/domain_name/ You can then update your config file to point to the certificates

config :app_name, App.Endpoint,
  ...
  https: [:inet6,
          port: 443,
          keyfile: "/etc/letsencrypt/live/domain_name/privkey.pem",
          cacertfile: "/etc/letsencrypt/live/domain_name/chain.pem",
          certfile: "/etc/letsencrypt/live/domain_name/cert.pem"]

Caveat: You will need to stop your webserver when you generate/renew certificates in standalone mode (once every 3 months)