Agent skill

docker-registry

Private registry setup, image management, and multi-registry operations

View SKILL.md on GitHub Repository
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Install this agent skill to your Project

npx add-skill https://github.com/pluginagentmarketplace/custom-plugin-docker/tree/main/skills/docker-registry

SKILL.md

Docker Registry Skill

Set up and manage private Docker registries for secure image distribution and management.

Purpose

Deploy private registries, configure authentication, and manage images across multiple registries.

Parameters

Parameter Type Required Default Description
registry_type enum No docker docker/ecr/gcr/acr
auth boolean No true Enable authentication
tls boolean No true Enable TLS

Registry Types

Registry Provider Auth Method
Docker Hub Docker Username/token
GHCR GitHub GitHub token
ECR AWS IAM/CLI
GCR Google Service account
ACR Azure Service principal

Private Registry Setup

Docker Compose

yaml
services:
  registry:
    image: registry:2
    ports:
      - "5000:5000"
    volumes:
      - registry_data:/var/lib/registry
      - ./auth:/auth
      - ./certs:/certs
    environment:
      REGISTRY_AUTH: htpasswd
      REGISTRY_AUTH_HTPASSWD_REALM: Registry Realm
      REGISTRY_AUTH_HTPASSWD_PATH: /auth/htpasswd
      REGISTRY_HTTP_TLS_CERTIFICATE: /certs/domain.crt
      REGISTRY_HTTP_TLS_KEY: /certs/domain.key
    restart: unless-stopped

volumes:
  registry_data:

Create Auth File

bash
# Create htpasswd file
docker run --rm --entrypoint htpasswd \
  httpd:alpine -Bbn admin password > auth/htpasswd

Registry Operations

Login

bash
# Docker Hub
docker login

# GitHub Container Registry
echo $GITHUB_TOKEN | docker login ghcr.io -u USERNAME --password-stdin

# AWS ECR
aws ecr get-login-password | docker login --username AWS --password-stdin <account>.dkr.ecr.<region>.amazonaws.com

# Private registry
docker login registry.example.com

Push/Pull

bash
# Tag for registry
docker tag myapp:latest registry.example.com/myapp:latest

# Push
docker push registry.example.com/myapp:latest

# Pull
docker pull registry.example.com/myapp:latest

Image Management

bash
# List images in registry (API)
curl -X GET https://registry.example.com/v2/_catalog

# List tags
curl -X GET https://registry.example.com/v2/myapp/tags/list

# Delete image (via API)
curl -X DELETE https://registry.example.com/v2/myapp/manifests/<digest>

Multi-Registry Sync

bash
# Copy between registries
skopeo copy \
  docker://source-registry/image:tag \
  docker://dest-registry/image:tag

# Sync all tags
skopeo sync --src docker --dest docker \
  source-registry/image dest-registry/

Cloud Registry Setup

AWS ECR

bash
# Create repository
aws ecr create-repository --repository-name myapp

# Login
aws ecr get-login-password --region us-east-1 | \
  docker login --username AWS --password-stdin <account>.dkr.ecr.us-east-1.amazonaws.com

# Push
docker push <account>.dkr.ecr.us-east-1.amazonaws.com/myapp:latest

Google GCR

bash
# Auth with service account
gcloud auth configure-docker

# Push
docker push gcr.io/project-id/myapp:latest

Error Handling

Common Errors

Error Cause Solution
unauthorized Bad credentials Re-login
manifest unknown Image not found Check name/tag
denied: access No permission Check IAM/roles
TLS handshake Certificate issue Add to trusted certs

Fallback Strategy

  1. Verify credentials: docker login
  2. Check image exists in registry
  3. Verify network connectivity

Troubleshooting

Debug Checklist

  • Logged in? docker login
  • Image tagged correctly?
  • Registry accessible? curl https://registry/v2/
  • TLS configured? Check certificates

Usage

Skill("docker-registry")

Assets

  • assets/docker-compose-registry.yaml - Registry setup
  • scripts/registry-setup.sh - Setup script

Related Skills

  • docker-optimization
  • docker-ci-cd

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