Simple api in flask w/docker

app.py

# src/app.py
from flask import Flask

app = Flask(__name__)
port = 3000

@app.route("/")
def main():
    return "Hello world"

if __name__ == "__main__":
    app.run(host='0.0.0.0', port=port)

docker-compose.yml

services:
  web:
    build: .
    ports:
      - "3000:3000"
    volumes:
      - ./src:/app/src

Dockerfile

FROM python:3.9-slim AS base

ENV PYTHONDONTWRITEBYTECODE 1
ENV PYTHONFAULTHANDLER 1


FROM base AS builder

COPY Pipfile Pipfile.lock ./
RUN python -m pip install --upgrade pip
RUN pip install pipenv
RUN PIPENV_VENV_IN_PROJECT=1 pipenv install --deploy


FROM base AS runtime

COPY --from=builder /.venv /.venv
ENV PATH="/.venv/bin:$PATH"

WORKDIR /app
COPY src/ src/
ENTRYPOINT [ "python", "src/app.py" ]

log.txt

$ docker compose up

#1 [internal] load build definition from Dockerfile
#1 transferring dockerfile: 32B done
#1 DONE 0.2s

#2 [internal] load .dockerignore
#2 transferring context: 2B done
#2 DONE 0.2s

#3 [internal] load metadata for docker.io/library/python:3.9-slim
#3 DONE 0.0s

#4 [base 1/1] FROM docker.io/library/python:3.9-slim
#4 CACHED

#5 [internal] load build context
#5 transferring context: 113B done
#5 DONE 0.1s

#6 [builder 1/4] COPY Pipfile Pipfile.lock ./
#6 CACHED

#7 [builder 2/4] RUN python -m pip install --upgrade pip
#7 CACHED

#8 [builder 3/4] RUN pip install pipenv
#8 21.96 WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f9f432f2eb0>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/pipenv/
#8 42.49 WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f9f432f2d60>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution')': /simple/pipenv/
#8 CANCELED

Pipefile.lock

{
    "_meta": {
        "hash": {
            "sha256": "903ea670e1e389320ed1f7cac23eb9b152bf693ab77c2e9e1ac1c68d43d3d473"
        },
        "pipfile-spec": 6,
        "requires": {},
        "sources": [
            {
                "name": "pypi",
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                "verify_ssl": true
            }
        ]
    },
    "default": {
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            "markers": "python_version >= '3.7'",
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Pipfile

[[source]]
url = "https://pypi.python.org/simple"
verify_ssl = true
name = "pypi"

[packages]
flask = '*'