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refactor: use minimal distroless base image to reduce image size #495

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refactor: use minimal distroless base image to reduce image size #495

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ac308b8
refactor: Optimize Docker image size using minimal distroless base wi…
balcsida Aug 13, 2025
e648785
fix: support cross-platform dynamic linker detection in Dockerfile
balcsida Aug 13, 2025
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24 changes: 19 additions & 5 deletions Dockerfile
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Original file line number Diff line number Diff line change
Expand Up @@ -10,10 +10,24 @@ WORKDIR /go/src/github.com/Azure/acr-cli
COPY . .
RUN make binaries && mv bin/acr /usr/bin/acr

FROM mcr.microsoft.com/azurelinux/base/core:3.0
RUN tdnf check-update \
&& tdnf --refresh install -y \
ca-certificates-microsoft \
&& tdnf clean all
# Manually copy essential libraries that Go FIPS binaries typically need
RUN mkdir -p /tmp/libs /tmp/linker && \
cp /lib64/libc.so.6 /tmp/libs/ 2>/dev/null || true && \
cp /lib64/libdl.so.2 /tmp/libs/ 2>/dev/null || true && \
cp /lib64/libpthread.so.0 /tmp/libs/ 2>/dev/null || true && \
cp /lib64/librt.so.1 /tmp/libs/ 2>/dev/null || true && \
cp /lib64/libresolv.so.2 /tmp/libs/ 2>/dev/null || true && \
cp /lib64/libssl.so* /tmp/libs/ 2>/dev/null || true && \
cp /lib64/libcrypto.so* /tmp/libs/ 2>/dev/null || true && \
cp /usr/lib64/libssl.so* /tmp/libs/ 2>/dev/null || true && \
cp /usr/lib64/libcrypto.so* /tmp/libs/ 2>/dev/null || true && \
find /lib /lib64 /usr/lib -name "ld-linux*" -exec cp {} /tmp/linker/ \; 2>/dev/null || true

FROM mcr.microsoft.com/azurelinux/distroless/minimal:3.0
# Copy the dynamic linker for the respective platform
COPY --from=acr-cli /tmp/linker/ /lib/
# Copy essential libraries
COPY --from=acr-cli /tmp/libs/ /lib64/
# Copy the binary
COPY --from=acr-cli /usr/bin/acr /usr/bin/acr
ENTRYPOINT [ "/usr/bin/acr" ]
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