claude
c098933f25
Sync course wiki / sync-wiki (push) Successful in 4s
Co-authored-by: claude <claude@jpaul.io> Co-committed-by: claude <claude@jpaul.io>
43 lines
2.1 KiB
Docker
43 lines
2.1 KiB
Docker
# Dockerfile for the tasks-app: a reproducible environment you can build, run, and throw away.
|
|
#
|
|
# Build it: docker build -t tasks-app .
|
|
# Run it: docker run --rm tasks-app list
|
|
# docker run --rm tasks-app add "containerize the app"
|
|
#
|
|
# The same image runs identically on your laptop, on the CI runner (Module 14), and on a deploy
|
|
# target (Module 18), because the environment travels *inside the image* instead of living only
|
|
# in your head. (Docker is the worked example here; this is a standard OCI image, so `podman build`
|
|
# / `nerdctl build` read the same file.)
|
|
|
|
# --- Base image -------------------------------------------------------------
|
|
# Pin the language version so the container matches what your CI pins (Module 14 used 3.12).
|
|
# "-slim" is a smaller Debian-based image: enough to run Python, without a full OS toolchain.
|
|
# For bit-for-bit reproducibility, pin the digest too (see "Where it breaks" in the README):
|
|
# FROM python:3.12-slim@sha256:<digest>
|
|
FROM python:3.12-slim
|
|
|
|
# Small, sane defaults: don't litter .pyc files, don't buffer stdout (so logs appear immediately).
|
|
ENV PYTHONDONTWRITEBYTECODE=1 \
|
|
PYTHONUNBUFFERED=1
|
|
|
|
# --- App --------------------------------------------------------------------
|
|
# Everything lives in /app inside the image. This path is identical on every machine that runs it;
|
|
# that sameness is the whole point.
|
|
WORKDIR /app
|
|
|
|
# Copy the app in. .dockerignore (see dockerignore-starter in this folder) keeps junk (caches,
|
|
# runtime state, the .git dir) out of the build and out of the image.
|
|
COPY tasks.py cli.py ./
|
|
|
|
# Run as a non-root user. This is hygiene, NOT a security boundary on its own; see the README's
|
|
# "Where it breaks." We also hand /app to that user so the app can write tasks.json at runtime.
|
|
RUN useradd --create-home appuser && chown appuser /app
|
|
USER appuser
|
|
|
|
# What runs when the container starts. ENTRYPOINT is the fixed command; CMD is the default
|
|
# argument, overridable at `docker run` time:
|
|
# docker run --rm tasks-app list -> python cli.py list
|
|
# docker run --rm tasks-app add "x" -> python cli.py add x
|
|
ENTRYPOINT ["python", "cli.py"]
|
|
CMD ["list"]
|