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at-container-registry/docs/appview.md
2025-10-21 10:49:06 -05:00

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# ATCR AppView
The **AppView** is the OCI-compliant registry server for ATCR (ATProto Container Registry). It provides the Docker Registry HTTP API V2 and a web interface for browsing container images.
## What is AppView?
AppView serves as the central registry server that:
- **Serves OCI Distribution API** - Compatible with Docker, containerd, podman, and other OCI clients
- **Resolves ATProto identities** - Converts handles and DIDs to PDS endpoints
- **Routes manifests** - Stores container manifests as ATProto records in users' Personal Data Servers
- **Routes blobs** - Proxies blob operations to hold services (S3-compatible storage)
- **Provides web UI** - Browse, search, and star repositories
## Image Format
Container images use ATProto identities:
```
atcr.io/alice.bsky.social/myapp:latest
atcr.io/did:plc:xyz123/myapp:latest
```
## Using ATCR
### Push Images
```bash
# Install credential helper
curl -fsSL https://atcr.io/install.sh | bash
# Configure Docker (add to ~/.docker/config.json)
{
"credHelpers": {
"atcr.io": "atcr"
}
}
# Push images (authenticates automatically)
docker tag myapp:latest atcr.io/yourhandle/myapp:latest
docker push atcr.io/yourhandle/myapp:latest
```
### Pull Images
```bash
# Public images (no auth required)
docker pull atcr.io/alice.bsky.social/myapp:latest
# Private images (automatic OAuth authentication)
docker pull atcr.io/yourhandle/private-app:latest
```
## Running Your Own AppView
Deploy your own registry instance with Docker Compose:
```bash
# Create configuration
cp .env.appview.example .env.appview
# Edit .env.appview with your settings
# Start services
docker-compose up -d
```
### Configuration
Key environment variables:
- `ATCR_HTTP_ADDR` - HTTP listen address (default: `:5000`)
- `ATCR_BASE_URL` - Public URL for OAuth/JWT realm
- `ATCR_DEFAULT_HOLD_DID` - Default hold service DID for blob storage (required)
- `ATCR_UI_ENABLED` - Enable web interface (default: `true`)
- `JETSTREAM_URL` - ATProto event stream URL for real-time updates
See [deployment documentation](https://tangled.org/@evan.jarrett.net/at-container-registry/blob/main/deploy/README.md) for production setup.
## Features
-**OCI-compliant** - Full Docker Registry API V2 support
-**ATProto OAuth** - Secure authentication with DPoP
-**Decentralized storage** - Manifests stored in users' PDS
-**Web UI** - Browse repositories, view tags, search images
-**Real-time updates** - Jetstream integration for live indexing
-**Multi-arch support** - ARM64, AMD64, and other platforms
-**BYOS** - Bring Your Own Storage via hold services
## Storage Architecture
**Hybrid model:**
- **Manifests** → ATProto records in user's PDS (small JSON metadata)
- **Blobs** → Hold services with S3-compatible backends (large binary layers)
This design keeps metadata portable and federated while leveraging cheap blob storage for layers.
## License
MIT
---
**Documentation:** https://tangled.org/@evan.jarrett.net/at-container-registry
**Source Code:** https://tangled.org/@evan.jarrett.net/at-container-registry