Simple private docker registry setup for running on remote hosts (docker-compose, ssl, letsencrypt, basic auth)

docker-compose.yml

# Simple registry setup
#
# Replace mydomain.com with your domain and ensure
# registry.mydomain.com points at your server.
#
# https://docs.docker.com/registry/configuration/
#
# Create your basic auth password file:
#
# % htpasswd -c -B htpasswd USERNAME
#
# Run docker-compose to bring it up
#
# % docker-compose up -d
#
# Test it
# 
# % docker login registry.mydomain.com
# 

version: '3.1'
volumes:
  registry-data:
    external: true
  registry-lets:
    external: true
    
services:
  registry:
    image: registry:2
    restart: always
    ports:
      - "443:5000"
      #- "5001:5001"
    volumes:
      - ./htpasswd:/htpasswd
      - registry-data:/var/lib/registry
      - registry-lets:/lets
    environment:
      REGISTRY_STORAGE_DELETE_ENABLED: "true"
      REGISTRY_HTTP_TLS_LETSENCRYPT_CACHEFILE: /lets/cache.json
      REGISTRY_HTTP_TLS_LETSENCRYPT_EMAIL: 'me@mydomain.com'
      REGISTRY_HTTP_ADDR: ':5000'
      REGISTRY_HTTP_HOST: 'https://registry.mydomain.com'
      REGISTRY_AUTH_HTPASSWD_REALM: 'registry.mydomain.com'
      REGISTRY_AUTH_HTPASSWD_PATH: /htpasswd
      #REGISTRY_HTTP_DEBUG_ADDR: ':5001'
      #REGISTRY_LOG_LEVEL: debug

so, just docker-compose up and thats it??

Tested on Ubuntu 16.04, doesn't work, not on a clean system at any rate. The container as it stands here can't see out properly while accepting secured connections. Getting a working private reg takes a bit more than this.