Configure S3-compatible access for Flask

Object storage client for a Flask app on Ample. Verified on Flask: bucket credentials delivered as encrypted S3_* environment variables and a validated PutObject/GetObject round-trip linked to a database row (upload=ok linked=ok).

Build and start

• pip install into .ample/python from requirements.txt, then waitress from app.py reading PORT on the python-3.12 template.

Prerequisites

• A Flask project (pip install into .ample/python from requirements.txt, then waitress from app.py reading PORT on the python-3.12 template)
• A bucket from ample bucket create with credentials passed as encrypted S3_* environment variables
• An Ample account token with servers:write, buckets:read

Resource Requirements

• primitive:compute
• primitive:s3-compatible-object-storage

Workflow Steps

1. Build and start
   pip install into .ample/python from requirements.txt, then waitress from app.py reading PORT on the python-3.12 template; the server must bind 0.0.0.0 on PORT.

2. Create the bucket and pass its credentials
   Create it once with ample bucket create, then pass endpoint, region, bucket and keys with --env; use path-style addressing.
   Command: ample deploy . --name --public --start "python3 app.py" --env S3_ENDPOINT=... --env S3_REGION=... --env S3_BUCKET=... --env S3_ACCESS_KEY_ID=... --env S3_SECRET_ACCESS_KEY=...

3. Verify
   Fetch the live URL and /p/browser-file-uploads on the example; on failure read the build and runtime logs.
   Command: ample logs --kind build

Success Checks

• app responds on its public URL
  Kind: http_get, Path: /, Expect: ample canary flask patterns
• browser-file-uploads check from the example
  Kind: http_get, Path: /p/browser-file-uploads, Expect: see the pattern fixture checks

Limitations

• Verified on the python-3.12 template at s-1vcpu-1gb; other sizes and Flask major versions are not verified.
• Region, compliance attestations and request-duration limits are unknown and not claimed.
• PutObject and GetObject with path-style addressing are verified; other S3 operations are not.

Examples

• Flask pattern fixture: Verified object storage client on Flask. Source Reference: tests/deploy-canaries/flask-patterns.

Cost Estimate

• Currency: USD
• Monthly Amount: 5.0
• 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.

System Setup

• 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 app.py

Evidence Summary

• Canary run: Flask pattern fixture deployed on Ample (pip install into .ample/python from requirements.txt, then waitress from app.py reading PORT on the python-3.12 template); for this guide: bucket credentials delivered as encrypted S3_* environment variables and a validated PutObject/GetObject round-trip linked to a database row (upload=ok linked=ok). Observed At: 2026-09-21T01:14:18Z
  • Implementation Revision: 50dbac567d2c5cc8e55e6c748a646be0025d9cfb-dirty (CLI 0.1.21)
  • Expires At: 2027-03-20T01:14:18Z