Question 415725 in Ubuntu Question posted in
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Ubuntu – GCP Cloud Run complains "can't open file '/app/main.py': [Errno 2] No such file or directory"

I have my project wrapped up as docker containers. Please see the Dockerfile:

FROM python:3.12-slim

WORKDIR /app

COPY requirements.txt /app/

RUN pip install --upgrade pip setuptools wheel 
    && pip install -r requirements.txt

COPY . .

CMD ["python", "main.py"]

And below is my ci.yml file

name: CI
on:
  push:
    branches:
      - main
  pull_request:
  workflow_dispatch:

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

jobs:
  dependencies:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - uses: actions/setup-python@v4
        with:
          cache: pip
          python-version: "3.12"
      - name: Install dependencies
        run: |
          python -m pip install --upgrade pip
          pip install -r requirements.txt

  deploy:
    needs: [dependencies]
    runs-on: ubuntu-latest
    if: |
      github.event_name == 'workflow_dispatch' || (github.event_name == 'push' && github.ref == 'refs/heads/main')
    env:
      DOCKER_BUILDKIT: 1
    steps:
      - uses: actions/checkout@v4

      - name: Set up Google Cloud SDK
        uses: google-github-actions/setup-gcloud@v1
        with:
          project_id: service-a-123456
          service_account_key: ${{ secrets.GOOGLE_AUTHENTICATION_CREDENTIALS_JSON }}
          export_default_credentials: true  

      - name: Authenticate with Google Cloud
        uses: google-github-actions/auth@v1
        with:
          credentials_json: ${{ secrets.GOOGLE_AUTHENTICATION_CREDENTIALS_JSON }}    

      - name: Authorize Docker push
        run: gcloud auth configure-docker us-west1-docker.pkg.dev
        

      # Docker runtime image
      - name: Build Runtime with Cache
        id: build-runtime-with-cache
        continue-on-error: true
        run: >-
          docker build
          --build-arg COLLECT_STATIC=1
          --build-arg BUILDKIT_INLINE_CACHE=1
          -f Dockerfile
          --cache-from ${{ secrets.RUNTIME_DOCKERIMAGE_URL }}:latest
          -t ${{ secrets.RUNTIME_DOCKERIMAGE_URL }}:${{ github.sha }}
          -t ${{ secrets.RUNTIME_DOCKERIMAGE_URL }}:latest
          .

      - name: Build Runtime with Cache failed -> Build Runtime without Cache
        if: ${{ steps.build-runtime-with-cache.outcome == 'failure' }}
        run: >-
          docker build
          --build-arg COLLECT_STATIC=1
          -f Dockerfile
          -t ${{ secrets.RUNTIME_DOCKERIMAGE_URL }}:${{ github.sha }}
          -t ${{ secrets.RUNTIME_DOCKERIMAGE_URL }}:latest
          .

      - name: Push runtime image to Artifact Registry
        run: docker push --all-tags ${{ secrets.RUNTIME_DOCKERIMAGE_URL }}

      - name: Deploy to Cloud Run
        uses: google-github-actions/deploy-cloudrun@v1
        with:
          service: ${{ secrets.CLOUD_RUN_NAME }}
          image: ${{ secrets.RUNTIME_DOCKERIMAGE_URL }}:${{ github.sha }}
          region: us-west1

Now, when I tried to deploy the container to GCP cloud run. First step push to artifact succeeded. However, when it was deployed to the cloud run, I got errors in the GCP logs:

{
  httpRequest: null
  insertId: "78475d0e111149z00b7b87cc"
  jsonPayload: null
  labels: {3}
  logName: "projects/service-a-123456/logs/run.googleapis.com%2Fstderr"
  operation: null
  payload: "textPayload"
  protoPayload: null
  receiveLocation: "us-west1"
  receiveTimestamp: "2024-11-14T19:25:19.018800003Z"
  resource: {2}
  severity: "DEFAULT"
  sourceLocation: null
  split: null
  textPayload: "python: can't open file '/app/main.py': [Errno 2] No such file or directory"
  timestamp: "2024-11-14T19:25:19.014505Z"
  traceSampled: false
}

As you can see, it clearly said python: can't open file '/app/main.py': [Errno 2] No such file or directory.

I then checked on my local docker by booting the containers with the docker desktop and in the service-a container, I can see the /app/main.py there.

/app/main.py existed in the docker container (local)

Please help. Thanks.

UPDATE: I downloaded the uploaded image and run on my local. And the current folder is "/", under it there is a app folder, which has Dockerfile and main.py. Still don’t know why it’s failed.

Tags:

2

Answers


  1. 0

    You have to start the path / to correspond with the root level and locate it in the folder app where you got the script for main.py. Change the config file as follows:

    CMD ["python",  "app/main.py"]

    OR

    CMD ["python", "./app/main.py"]

    Hope it helps!

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  2. 0

    Thank you for the information you’ve provided. I’m glad to share some thoughts to address your problem, and I hope this solution works this time.

    1. If you’re using a .dockerignore file, double-check that it’s not excluding main.py or the directory containing it.

      Common .dockerignore mistakes:

      *.pyc
__pycache__
.git
main.py  # Ensure this is not excluded

    2. Install dependencies with no caching (to reduce image sizes and avoids stale dependencies) and update copy application files to Dockerfile.

      FROM python:3.12-slim

WORKDIR /app

COPY requirements.txt /app/

# Install dependencies with no caching
RUN pip install --upgrade pip setuptools wheel 
    && pip install --no-cache-dir -r requirements.txt

# Copy application files
COPY . /app


CMD ["python", "/app/main.py"] # Explicitly run the main script

    By doing this, verify the location of main.py. It must be present in the build context and not excluded by .dockerignore.

    Thank you.

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