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kubernetes: minimise size of image cache images
The total size of the images in the common and control-plane cache is 251M and 528M respectively. This changes drops the size of the cache images from 353M to 274M and from 630M to 530M, reducing the overhead from ~100M to ~20M. The initrd images shrink from 273M to 246M and from 416M to 363M (the initrd's are compressed). Signed-off-by: Ian Campbell <ijc@docker.com>
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@ -1,4 +1,21 @@
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FROM docker:17.06.0-ce-dind
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FROM docker:17.06.0-ce-dind AS docker
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# Nothing to do in here, just for COPY --from=docker below
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FROM linuxkit/alpine:9bcf61f605ef0ce36cc94d59b8eac307862de6e1 AS build
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RUN mkdir -p /out/etc/apk && cp -r /etc/apk/* /out/etc/apk/
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RUN apk add --no-cache --initdb -p /out \
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alpine-baselayout \
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busybox
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# Remove apk residuals. We have a read-only rootfs, so apk is of no use.
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RUN rm -rf /out/etc/apk /out/lib/apk /out/var/cache
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FROM scratch
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WORKDIR /
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COPY --from=build /out /
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COPY --from=docker /usr/local/bin/docker /usr/local/bin/docker
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COPY *.tar /images/
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ENTRYPOINT [ "/bin/sh", "-c" ]
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CMD [ "for image in /images/*.tar ; do docker image load -i $image && rm -f $image ; done" ]
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