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Reduce footprint of UBI images #717

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Aug 28, 2024
Merged

Reduce footprint of UBI images #717

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ee35f75
Reduce footprint of UBI images by only keeping relevant packages and …
bainsy88 Jul 29, 2024
085309a
Fix bash syntax error
bainsy88 Jul 29, 2024
c353a98
Add missing ARG
bainsy88 Jul 29, 2024
e4f4f5a
TARGETARCH set by buildx and avoids splitting another VAR
bainsy88 Jul 29, 2024
5d6b6f4
Update Dockerfile.ubi
bainsy88 Aug 27, 2024
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31 changes: 26 additions & 5 deletions Dockerfile.ubi
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Original file line number Diff line number Diff line change
Expand Up @@ -3,16 +3,37 @@ ARG BASE_IMAGE

FROM --platform=${BUILDPLATFORM} ${BUILDER_IMAGE} as SRC

FROM ${BASE_IMAGE:-registry.access.redhat.com/ubi8/ubi-minimal:latest}
FROM ${BASE_IMAGE:-registry.access.redhat.com/ubi8/ubi:latest} as minimal-ubi
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ARG TARGETARCH


RUN dnf update -y && dnf install -y binutils
# prep target rootfs for scratch container
WORKDIR /
COPY --from=SRC /manager .
RUN mkdir /image && \
ln -s usr/bin /image/bin && \
ln -s usr/sbin /image/sbin && \
ln -s usr/lib64 /image/lib64 && \
ln -s usr/lib /image/lib && \
mkdir -p /image/{usr/bin,usr/lib64,usr/lib,root,home,proc,etc,sys,var,dev}

# Update image
RUN microdnf update
COPY ubi-build-files-${TARGETARCH}.txt /tmp
# Copy all the required files from the base UBI image into the image directory
# As the go binary is not statically compiled this includes everything needed for CGO to work, cacerts, tzdata and RH release files
RUN tar cf /tmp/files.tar -T /tmp/ubi-build-files-${TARGETARCH}.txt && tar xf /tmp/files.tar -C /image/ \
&& strip --strip-unneeded /image/usr/lib64/*[0-9].so

USER 65532:65532
# Generate a rpm database which contains all the packages that you said were needed in ubi-build-files-*.txt
RUN rpm --root /image --initdb \
&& PACKAGES=$(rpm -qf $(cat /tmp/ubi-build-files-${TARGETARCH}.txt) | grep -v "is not owned by any package" | sort -u) \
&& echo dnf install -y 'dnf-command(download)' \
&& dnf download --destdir / ${PACKAGES} \
&& rpm --root /image -ivh --justdb --nodeps `for i in ${PACKAGES}; do echo $i.rpm; done`

FROM scratch
COPY --from=minimal-ubi /image/ /
COPY --from=SRC /manager .
USER 65532:65532
# Port for metrics and probes
EXPOSE 9090

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15 changes: 15 additions & 0 deletions ubi-build-files-amd64.txt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,15 @@
etc/pki
root/buildinfo
etc/ssl/certs
etc/redhat-release
usr/share/zoneinfo
usr/lib64/ld-2.28.so
usr/lib64/ld-linux-x86-64.so.2
usr/lib64/libc-2.28.so
usr/lib64/libc.so.6
usr/lib64/libdl-2.28.so
usr/lib64/libdl.so.2
usr/lib64/libpthread-2.28.so
usr/lib64/libpthread.so.0
usr/lib64/libm-2.28.so
usr/lib64/libm.so.6
15 changes: 15 additions & 0 deletions ubi-build-files-arm64.txt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,15 @@
etc/pki
root/buildinfo
etc/ssl/certs
etc/redhat-release
usr/share/zoneinfo
usr/lib64/ld-2.28.so
usr/lib64/ld-linux-aarch64.so.1
usr/lib64/libc-2.28.so
usr/lib64/libc.so.6
usr/lib64/libdl-2.28.so
usr/lib64/libdl.so.2
usr/lib64/libpthread-2.28.so
usr/lib64/libpthread.so.0
usr/lib64/libm-2.28.so
usr/lib64/libm.so.6
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