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Change ADD to COPY 

According to "Best practices for writing Dockerfiles" COPY is preferred "because it’s more transparent than ADD".
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Craig Pastro 2018-08-13 15:16:18 +09:00 committed by GitHub
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get-started/part2.md
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@ -69,7 +69,7 @@ FROM python:2.7-slim
WORKDIR /app
# Copy the current directory contents into the container at /app
ADD . /app
COPY . /app
# Install any needed packages specified in requirements.txt
RUN pip install --trusted-host pypi.python.org -r requirements.txt
@ -92,7 +92,7 @@ This `Dockerfile` refers to a couple of files we haven't created yet, namely
Create two more files, `requirements.txt` and `app.py`, and put them in the same
folder with the `Dockerfile`. This completes our app, which as you can see is
quite simple. When the above `Dockerfile` is built into an image, `app.py` and
`requirements.txt` is present because of that `Dockerfile`'s `ADD` command,
`requirements.txt` is present because of that `Dockerfile`'s `COPY` command,
and the output from `app.py` is accessible over HTTP thanks to the `EXPOSE`
command.