page:guides:starlette:build and start

Configure build and start for Starlette

Summary

Build and start for a Starlette app on Ample. Verified on Starlette: the app built and started with the documented commands and answered on its public HTTPS URL. Build and start: pip install into .ample/python from requirements.txt, then uvicorn from run.py reading PORT on the python-3.12 template.

Prerequisites

• A Starlette project (pip install into .ample/python from requirements.txt, then uvicorn from run.py reading PORT on the python-3.12 template)
• An Ample account token with servers:write

Tested Configuration

• Template: python-3.12
• Runtime: python
• Size: s-1vcpu-1gb
• Install: python3 -m pip install --target .ample/python -r requirements.txt
• Start: PYTHONPATH=.ample/python:${PYTHONPATH:-} python3 run.py

Workflow Steps

1. Build and start
   pip install into .ample/python from requirements.txt, then uvicorn from run.py reading PORT on the python-3.12 template; the server must bind 0.0.0.0 on PORT.
2. Deploy
   Run the synchronous deploy once and read the result.
   Command: ample deploy . --name --public --start "python3 run.py"
3. Verify
   Fetch the live URL on the example; on failure read the build and runtime logs.
   Command: ample logs --kind build

Success Checks

• App responds on its public URL

Limitations

• Verified on the python-3.12 template at s-1vcpu-1gb; other sizes and Starlette major versions are not verified.
• Region, compliance attestations, and request-duration limits are unknown and not claimed.

Evidence Summary

• Kind: canary_run
  Summary: Starlette pattern fixture deployed on Ample (pip install into .ample/python from requirements.txt, then uvicorn from run.py reading PORT on the python-3.12 template); for this guide: the app built and started with the documented commands and answered on its public HTTPS URL.
  Observed At: 2026-09-21T01:21:36Z
  Implementation Revision: 50dbac567d2c5cc8e55e6c748a646be0025d9cfb-dirty (CLI 0.1.21)
  Expires At: 2027-03-20T01:21:36Z

Cost Estimate

• Currency: USD
  Monthly Amount: 5.0
  Basis: size prices from pricing.toml (loaded by the API) at build revision 1ac5595375130d45290090e82ed0f554ccd45405-dirty
  Components:
  • App server, size: s-1vcpu-1gb, quantity: 1.0, monthly amount: 5.0
• Note: Always-on monthly price of the tested sizes; apps auto-pause when idle. Buckets are allocation-priced per quota and not included.

Next Actions

1. Browse the catalog index
2. Search published recipes by intent, stack and constraints
3. Prepare a side-effect-free deployment plan for an authorized project
4. Read the existing agent authentication setup
5. Browse Starlette
6. Browse Configure deployment
7. Browse Public web service

Examples

• Title: Starlette pattern fixture Description: Verified build and start on Starlette. Source Ref: tests/deploy-canaries/starlette-patterns

Resource Requirements

• Primitive: compute

Infrastructure Requirements

• Primitive ID: primitive:compute
  Label: Compute
  Status: verified
  Summary: Apps run in isolated x86_64 Firecracker microVMs that auto-pause when idle and wake on request; sizes are the priced VM sizes.