halbebruno/cloudflare-ddns
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Reduce Docker image size by only copying pip installed dependencies

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Currently, the multi-stage Docker build makes the `release` stage
inherit from `dependencies`, which will include any files created by the
`pip install` process in the final image.

By using `pip install --user` to make dependencies be installed in
`~/.local`, we can only copy those files into the final image, reducing
the image size:

```
cloudflare-ddns-fix-applied     latest            68427bd7c88d   3 minutes ago   54.6MB
cloudflare-ddns-master          latest            2675320b651d   8 minutes ago   65.9MB
```

A good resource going deeper on how this approach works can be found at
https://pythonspeed.com/articles/multi-stage-docker-python/, solution 1.
This commit is contained in:
Michael Manganiello 2023-02-22 10:26:02 -03:00
parent 6e92fc0d09
commit 0ca623329a
1 changed files with 6 additions and 5 deletions
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@ -6,12 +6,13 @@ FROM python:alpine AS base
FROM base AS dependencies
# install dependencies
COPY requirements.txt .
RUN pip install -r requirements.txt
RUN pip install --user -r requirements.txt
#
# ---- Release ----
FROM dependencies AS release
# copy project source file(s)
FROM base AS release
# copy installed dependencies and project source file(s)
WORKDIR /
COPY --from=dependencies /root/.local /root/.local
COPY cloudflare-ddns.py .
CMD ["python", "-u", "/cloudflare-ddns.py", "--repeat"]