How to test dockerignore file?

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To expand on VonC’s suggestion, here’s a sample build command you can use to create an image with the current folder’s build context:

docker image build --no-cache -t build-context -f - . <<EOF
FROM busybox
WORKDIR /build-context
COPY . .
CMD find .
EOF

Once created, run the container and inspect the contents of the /build-context directory which includes everything not excluded by the .dockerignore file:

# run the default find command
docker container run --rm build-context

# or inspect it from a shell using
docker container run --rm -it build-context /bin/sh

You can then cleanup with:

docker image rm build-context

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