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create minimal nsswitch.conf file in Docker image #1

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create minimal nsswitch.conf file in Docker image #1

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9 changes: 9 additions & 0 deletions docker/Dockerfile.flux
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Expand Up @@ -37,6 +37,15 @@ ENTRYPOINT [ "/sbin/tini", "--", "fluxd" ]
COPY --from=quay.io/squaremo/kubeyaml:0.5.1 /usr/lib/kubeyaml /usr/lib/kubeyaml/
ENV PATH=/bin:/usr/bin:/usr/local/bin:/usr/lib/kubeyaml

# Create minimal nsswitch.conf file to prioritize the usage of /etc/hosts over DNS queries.
# This resolves the conflict between:
# * fluxd using netgo for static compilation. netgo reads nsswitch.conf to mimic glibc,
# defaulting to prioritize DNS queries over /etc/hosts if nsswitch.conf is missing:
# https://github.com/golang/go/issues/22846
# * Alpine not including a nsswitch.conf file. Since Alpine doesn't use glibc
# (it uses musl), maintainers argue that the need of nsswitch.conf is a Go bug:
# https://github.com/gliderlabs/docker-alpine/issues/367#issuecomment-354316460
RUN [ ! -e /etc/nsswitch.conf ] && echo 'hosts: files dns' > /etc/nsswitch.conf
COPY ./kubeconfig /root/.kube/config
COPY ./fluxd /usr/local/bin/

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