'Solution'#301
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Review Summary
Your implementation has two critical issues that violate explicit task requirements. First, database migration must be a RUN instruction, not placed in CMD. The task requirement #5 explicitly states "Execute database migration as RUN instruction" - this means RUN python manage.py migrate should be added as a separate build stage instruction before your CMD. Currently, migration runs at container startup which doesn't meet the requirement. Second, the INSTRUCTION.md file is incomplete - it must include: 1) docker build -t todoapp:1.0.0 . to build the image, 2) docker run -p 8080:8080 todoapp:1.0.0 to run the container, and 3) browser access instructions pointing to http://localhost:8080 or http://0.0.0.0:8080. Please fix the Dockerfile by moving migration to a RUN instruction and complete the INSTRUCTION.md file with all required build, run, and access information.
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Footnotes
| COPY . . | ||
| ENV PYTHONUNBUFFERED=1 | ||
| EXPOSE 8080 | ||
| CMD ["sh", "-c", "python manage.py migrate && python manage.py runserver 0.0.0.0:8080"] No newline at end of file |
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The task requirement #5 states: 'Execute database migration as RUN instruction'. However, migration is currently in CMD which runs at container startup, not during build. The python manage.py migrate should be a separate RUN instruction in the Dockerfile (e.g., RUN python manage.py migrate), not combined with CMD.
| ARG python_version=3.14 | ||
| FROM python:${python_version} AS builder | ||
| WORKDIR /app | ||
| COPY requirements.txt . | ||
| RUN pip install --no-cache-dir --prefix=/install -r requirements.txt | ||
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| FROM python:${python_version} | ||
| WORKDIR /app | ||
| COPY --from=builder /install /usr/local | ||
| COPY . . | ||
| ENV PYTHONUNBUFFERED=1 | ||
| EXPOSE 8080 |
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The INSTRUCTION.md file is incomplete. It only shows the beginning of the 'git clone' instructions but doesn't include: 1) How to build the image (docker build -t todoapp .), 2) How to run the container, 3) Instructions for accessing the application via browser at http://localhost:8080 or http://0.0.0.0:8080.
| # ToDo App — Docker Instructions | ||
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| ## Docker Hub Repository | ||
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| Image is available at: https://hub.docker.com/r/tanyasavenko/todoapp | ||
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| ## Building the image | ||
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| 1. Clone the repository: | ||
| ```bash | ||
| git clone [https://github.com/tanyasavenko/devops_todolist.git](https://github.com/tanyasavenko/devops_todolist.git) | ||
| cd devops_todolist No newline at end of file |
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The INSTRUCTION.md file is incomplete. It must contain: 1) Instructions for building the image (docker build -t todoapp:1.0.0 .), 2) Instructions for running the container (docker run), 3) Instructions for accessing the application via browser (http://localhost:8080 or http://:8080).
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Review Summary
Your solution is approved. The Dockerfile correctly implements a multi-stage build with the required ARG for Python version, ENV PYTHONUNBUFFERED=1 configuration, and database migration as a RUN instruction. The runserver is properly configured to listen on 0.0.0.0:8080. The INSTRUCTION.md file contains all required documentation including the Docker Hub repository link, build command, run command, and browser access instructions. All checklist items have been satisfied. Great work on implementing these requirements!
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Footnotes
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