# Docker Registry Operations

> Use when pushing/pulling/managing registry images.

- Skill: `loopyluci/docker-registry-operations` (Agent Skill)
- Install (CLI): `npx skillmds@latest add loopyluci/docker-registry-operations`
- Raw SKILL.md: https://api.skillmd.com/api/skills/loopyluci/docker-registry-operations/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: DevOps & Infra
- Author: LoopyLuci (https://skillmd.com/u/loopyluci)
- Updated: 2026-09-08
- Page: https://skillmd.com/skills/loopyluci/docker-registry-operations

---

# Docker Registry Operations

Working with image registries.

## Auth
```powershell
docker login
docker login ghcr.io -u USER --password-stdin < token.txt
docker login myregistry.com:5000 -u admin -p password
```

## Tag & Push
```powershell
docker tag myapp:latest myrepo/myapp:latest
docker push myrepo/myapp:latest
docker push --all-tags myrepo/myapp
```

## Pull
```powershell
docker pull nginx:alpine
docker pull ghcr.io/owner/image:tag
```

## Cross-Registry
```powershell
docker pull oldreg.com/myapp:latest
docker tag oldreg.com/myapp:latest newreg.com/myapp:latest
docker push newreg.com/myapp:latest
```

## Multi-Arch
```powershell
docker buildx build --platform linux/amd64,linux/arm64 \\
    -t myrepo/myapp:latest --push .
```

## Pitfalls
- Tags are mutable -- use @sha256: for production
- Docker Hub rate limits anonymous pulls
- GC doesn't free disk until blob deletion