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38787b1ddd
This adds a helper which monitors the Docker event stream and, when it receives an image delete event, queues a call to `fstrim /var/lib/docker` to trigger a space reclamation. Previously we would rely on a cron job running every 15 minutes. Signed-off-by: David Scott <dave.scott@docker.com>
27 lines
882 B
Docker
27 lines
882 B
Docker
# We need the `fstrim` binary:
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FROM linuxkit/alpine:630ee558e4869672fae230c78364e367b8ea67a9 AS mirror
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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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util-linux
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# Remove apk residuals
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RUN rm -rf /out/etc/apk /out/lib/apk /out/var/cache
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# We also need the Go binary which calls it:
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RUN apk add --no-cache go musl-dev
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ENV GOPATH=/go PATH=$PATH:/go/bin
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COPY . /go/src/trim-after-delete
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RUN go-compile.sh /go/src/trim-after-delete
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FROM scratch
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ENTRYPOINT []
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CMD []
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WORKDIR /
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COPY --from=mirror /out/ /
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COPY --from=mirror /go/bin/trim-after-delete /usr/bin/trim-after-delete
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CMD ["/usr/bin/trim-after-delete", "--", "/sbin/fstrim", "/var/lib/docker"]
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LABEL org.mobyproject.config='{"binds": ["/var/run:/var/run", "/var/lib/docker:/var/lib/docker"], "capabilities": ["CAP_SYS_ADMIN"]}'
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