Reverse proxy for Docker Hub using docker and caddy.

config.yml

version: 0.1
log:
  fields:
    service: registry
storage:
  cache:
    blobdescriptor: inmemory
  filesystem:
    rootdirectory: /var/lib/registry
  delete:
    enabled: true
http:
  addr: :5000
  headers:
    X-Content-Type-Options: [nosniff]
health:
  storagedriver:
    enabled: true
    interval: 10s
    threshold: 3
proxy:
  remoteurl: https://registry-1.docker.io

docker-compose.yml

version: "3.8"

services:
  registry-proxy:
    image: registry
    restart: unless-stopped
    ports:
      - 5000:5000
    volumes:
      - ./data:/var/lib/registry
      - ./config.yml:/etc/docker/registry/config.yml

dockerhub.caddyfile

dockerhub.domain.ltd {
  # cert setting missing

	header Docker-Distribution-Api-Version "registry/2.0"

	handle /_ping {
		reverse_proxy :5000
	}
	handle /v2/_ping {
		reverse_proxy :5000
	}
	handle /v2/_catalog {
		reverse_proxy :5000
	}
	handle {
		reverse_proxy :5000 {
			transport http {
				read_timeout 900s
			}
		}
	}
}

dockerhub.service

[Unit]
Description=Docker Compose Dockerhub Service
Requires=docker.service
After=docker.service

[Service]
# Where the docker-compose file is located
WorkingDirectory=/srv/dockerhub
ExecStart=/usr/bin/docker compose up
ExecStop=/usr/bin/docker compose down
TimeoutStartSec=0
Restart=on-failure
StartLimitBurst=3

[Install]
WantedBy=multi-user.target