## Host public directory with Next.js: object-stored public media

Deploy a public directory built with Next.js on Ample using the public media library pattern. Compute runs the app in an isolated microVM behind a public HTTPS URL, a managed PostgreSQL 16 database is auto-provisioned and injected as DATABASE_URL, a private S3-compatible bucket holds objects with credentials delivered as encrypted environment variables, and a published bucket serves public assets from the CDN host. Verified on Next.js: an object written to a published bucket with an immutable Cache-Control header, a mapping row, and the CDN URL serving it publicly. Not separately tested: your media processing, object layout and cache policy; treat the public directory-specific behavior as your application code.

### Representative Queries
- Host public directory with Next.js: object-stored public media
- Where can I host Public directory built with Next.js?
- I need an object layout, public asset URL policy and CDN delivery configuration.

### Resource Requirements
- primitive:compute
- primitive:postgres
- primitive:s3-compatible-object-storage
- primitive:cdn

### Infrastructure Requirements
1. **Compute**: Apps run in isolated x86_64 Firecracker microVMs that auto-pause when idle and wake on request; sizes are the priced VM sizes.
2. **Postgres**: Managed PostgreSQL 16 runs in its own microVM and is auto-provisioned when an app needs a database and no DATABASE_URL is supplied.
3. **S3-compatible object storage**: Buckets are S3-compatible with issued credentials; PutObject and GetObject are verified by canary. Other S3 operations are not verified.
4. **CDN**: The CDN host serves objects from published buckets. It does not front app compute and is not a cache or key-value store.

### Prerequisites
1. A Next.js project that builds and starts with the documented commands (next build then next start -H 0.0.0.0 -p $PORT on the node-22 template).
2. A PostgreSQL driver reading DATABASE_URL at runtime (auto-provisioned when omitted, or supplied with --env).
3. A bucket from `ample bucket create` with its credentials passed as encrypted S3_* environment variables and a second, published bucket for public assets (CDN_*).
4. An Ample account token with servers:write, databases:read, buckets:read.

### Workflow Steps
1. **Build and start**: next build then next start -H 0.0.0.0 -p $PORT on the node-22 template. The server must bind 0.0.0.0 on PORT.
2. **Implement the pattern on PostgreSQL**: The fixture's module implements public media library: an object written to a published bucket with an immutable Cache-Control header, a mapping row, and the CDN URL serving it publicly. Copy the approach into your schema; keep migrations idempotent and run them with --release-command.
3. **Wire object storage**: Create the bucket(s), then pass endpoint, region, bucket and keys as --env values. Use path-style addressing. Keep private data in an unpublished bucket. Publish only the bucket that serves public assets and reference its CDN URL.
4. **Deploy**: Run the synchronous deploy once and read the result (exit 0 live, 1 failed, 2 blocked). Re-running with no change is a no-op.
   Command: ample deploy . --name  --public --env S3_ENDPOINT=... --env S3_REGION=... --env S3_BUCKET=... --env S3_ACCESS_KEY_ID=... --env S3_SECRET_ACCESS_KEY=... --env CDN_PUBLIC_URL=...
5. **Verify**: Fetch the live URL and the pattern self-test route(s) (/p/public-media-library) from the example; then run your own checks. On failure read `ample logs  --kind build` then `--kind runtime`.
   Command: ample logs  --kind build

### Limitations
- Verified on the node-22 template at s-1vcpu-1gb with the example fixture; other sizes, templates and Next.js major versions are not verified.
- The public directory itself (your media processing, object layout and cache policy) is application code and was not separately tested; the pattern checks are what was verified.
- Region, compliance attestations and request-duration limits are unknown and not claimed.
- Apps auto-pause when idle and wake on the next request; always-on is an operator setting, not a plan feature.
- Managed PostgreSQL 16 only; extensions, connection limits and backup or restore procedures are not verified; apps and their databases are placed together.
- PutObject and GetObject with path-style addressing are verified; multipart upload, listing, presigned URLs and lifecycle rules are not.
- The CDN serves published-bucket objects only; cache rules, purge and TTL control are not verified (the fixture sets Cache-Control on upload and versions keys).

### Cost Estimate
- **Currency**: USD
- **Monthly Amount**: 10.0
- **Components**:
  - App server (size: s-1vcpu-1gb, quantity: 1.0, monthly amount: 5.0)
  - Managed PostgreSQL database (size: s-1vcpu-1gb, quantity: 1.0, monthly amount: 5.0)
- **Note**: Always-on monthly price of the tested sizes; apps and databases auto-pause when idle. Buckets are allocation-priced per quota and not included.

### Next Actions
1. **Browse the catalog index**:  
   - **Action ID**: browse-catalog  
   - **Method**: GET  
   - **Relative Path**: /v1/catalog

2. **Search published recipes by intent, stack and constraints**:  
   - **Action ID**: search-recipes  
   - **Method**: POST  
   - **Relative Path**: /v1/catalog/search

3. **Prepare a side-effect-free deployment plan for an authorized project**:  
   - **Action ID**: plan:page:recipes:public-directory:next-js:public-media  
   - **Method**: POST  
   - **Relative Path**: /v1/catalog/plan

4. **Read the existing agent authentication setup**:  
   - **Action ID**: auth-setup  
   - **Method**: GET  
   - **Relative Path**: /mcp/setup

5. **Browse Public directory**:  
   - **Action ID**: browse:workload:public-directory  
   - **Method**: GET  
   - **Relative Path**: /v1/catalog/nodes/workload%3Apublic-directory

6. **Browse Next.js**:  
   - **Action ID**: browse:stack:framework-next-js  
   - **Method**: GET  
   - **Relative Path**: /v1/catalog/nodes/stack%3Aframework-next-js

7. **Browse Public media library**:  
   - **Action ID**: browse:pattern:public-media-library  
   - **Method**: GET  
   - **Relative Path**: /v1/catalog/nodes/pattern%3Apublic-media-library

8. **Browse Deploy web app**:  
   - **Action ID**: browse:intent:deploy-web-app  
   - **Method**: GET  
   - **Relative Path**: /v1/catalog/nodes/intent%3Adeploy-web-app