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Lightweight Kubernetes
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k3s/package/Dockerfile

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FROM alpine:3.20 as base
RUN apk add -U ca-certificates zstd tzdata
COPY build/out/data.tar.zst /
RUN mkdir -p /image/etc/ssl/certs /image/run /image/var/run /image/tmp /image/lib/modules /image/lib/firmware && \
zstdcat -d /data.tar.zst | tar -xa -C /image && \
echo "root:x:0:0:root:/:/bin/sh" > /image/etc/passwd && \
echo "root:x:0:" > /image/etc/group && \
cp /etc/ssl/certs/ca-certificates.crt /image/etc/ssl/certs/ca-certificates.crt
FROM scratch as collect
ARG DRONE_TAG="dev"
COPY --from=base /image /
COPY --from=base /usr/share/zoneinfo /usr/share/zoneinfo
RUN mkdir -p /etc && \
echo 'hosts: files dns' > /etc/nsswitch.conf && \
echo "PRETTY_NAME=\"K3s ${DRONE_TAG}\"" > /etc/os-release && \
chmod 1777 /tmp
FROM scratch
COPY --from=collect / /
VOLUME /var/lib/kubelet
VOLUME /var/lib/rancher/k3s
VOLUME /var/lib/cni
VOLUME /var/log
ENV PATH="$PATH:/bin/aux"
ENV CRI_CONFIG_FILE="/var/lib/rancher/k3s/agent/etc/crictl.yaml"
ENTRYPOINT ["/bin/k3s"]
CMD ["agent"]