Apa iku Docker registry lan kepiye carane nggunakake?

Question

Accepted Answer

A **Docker registry** yaiku sistem panyimpenan lan distribusi kanggo Docker **images** — sampeyan **push** images menyang dheweke lan **pull** saka dheweke. **Docker Hub** yaiku registry publik bawaan; organisasi asring nggunakake registry pribadi. Registry yaiku cara images dibagi lan dideploy.

## Apa sing ditindakake registry

```text
A REGISTRY stores and distributes Docker images:
  → PUSH an image to the registry (upload/publish it)
  → PULL an image from the registry (download it to run)
→ This is how images move between machines: build once, push, pull anywhere
  (CI builds an image → pushes to a registry → production pulls and runs it)
```

## Nggunakake Docker Hub (registry publik bawaan)

```bash
# pull a public image (implicitly from Docker Hub)
docker pull nginx:latest
docker pull postgres:16

# push your own image
docker login                          # authenticate
docker tag myapp:1.0 username/myapp:1.0   # tag with your registry namespace
docker push username/myapp:1.0        # upload to Docker Hub
```

**Docker Hub** yaiku registry bawaan — `docker pull nginx` ngambil saka dheweke. Kanggo menerbitake images dhewe, sampeyan mlebu, nandai karo namespace sampeyan, lan push.

## Registry pribadi lan cloud

```text
Organizations use PRIVATE registries (images not public):
  → cloud provider registries: AWS ECR, Google GCR/Artifact Registry, Azure ACR
  → GitHub Container Registry, GitLab Registry, self-hosted Harbor, etc.
→ Used to store proprietary images securely; integrated with CI/CD and deployment.
```

## Tags lan versioning

```text
→ Images are tagged: name:tag (e.g. myapp:1.0, myapp:latest, myapp:abc123)
→ Use specific version tags (myapp:1.2.3) in production, NOT just "latest"
  ("latest" is mutable/ambiguous → unpredictable deployments)
```

## Sebabe iki penting

Ngerteni Docker registry penting sabab iku cara Docker images **dibagi lan dideploy**, bagean fundamental saka Docker workflow, mula iku pengetahuan praktis sing berharga.

Fungsi inti registry — nyimpen images sing sampeyan **push** (nerbitake) lan **pull** (ngundhuh) — penting banget carane images pindhah antarane mesin lan tekan produksi: workflow sing umum ana CI nggawe image, push menyang registry, lan produksi pull lan jalanake, ndadekake registry pusat distribusi lan deployment images.

Ngerteni **Docker Hub** (registry publik bawaan sing `docker pull` gunakake, lan endi sampeyan bisa menerbitake images kanthi mlebu, nandai karo namespace sampeyan, lan push) yaiku landhesan.

Nandang **registry pribadi lan cloud** (AWS ECR, Google Artifact Registry, Azure ACR, GitHub Container Registry, lsp.) penting kanggo organisasi nyata, sing nyimpen images proprietary kanthi aman lan ngintegrasikake registry karo CI/CD lan deployment pipeline.

Ngerteni **tags lan versioning** berharga kanthi praktis — utamane praktik terbaik nggunakake **specific version tags** (`myapp:1.2.3`) tinimbang `latest` ing produksi (amarga `latest` mutable lan ambigu, nyebabake deployment sing ora bisa diduga), pertimbangan real-world sing umum.

Amarga dibagi lan deploy images yaiku bagean fundamental saka nggunakake Docker (images kudu didistribusikake kanggo nglakokake ing endi wae), lan amarga registry (Docker Hub, registry pribadi/cloud) yaiku mekanisme kanggo iki — sentral menyang CI/CD lan workflow deployment — ngerteni Docker registry, push/pull, lan tagging yaiku pengetahuan berharga, relevant kang asring dikarepake kanggo Docker workflow lengkap, perlu kanggo distribusikake lan deploy aplikasi containerized ing setting nyata apa wae.