kubernetes: Build image using Dockerfile and standard build system

This is a pretty straight port of the previous box stuff, without much attempt
to clean things up.

Image label is a placeholder, will update once a batch of changes are complete.

Signed-off-by: Ian Campbell <ijc@docker.com>

projects/kubernetes/kubernetes/Dockerfile

@@ -0,0 +1,48 @@
+#FROM linuxkit/alpine:9bcf61f605ef0ce36cc94d59b8eac307862de6e1 AS build
+# XXX needs ebtables ethtool iproute2 libc6-compat socat
+FROM alpine:3.6 AS build
+
+ENV kubernetes_version v1.6.1
+ENV weave_version      v1.9.4
+ENV cni_version        0799f5732f2a11b329d9e3d51b9c8f2e3759f2ff
+
+ENV kube_release_artefacts "https://dl.k8s.io/${kubernetes_version}/bin/linux/amd64"
+
+RUN apk add -U --no-cache \
+  curl \
+  && true
+
+RUN mkdir -p /out/etc/apk && cp -r /etc/apk/* /out/etc/apk/
+RUN apk add --no-cache --initdb -p /out \
+    alpine-baselayout \
+    busybox \
+    ca-certificates \
+    curl \
+    ebtables \
+    ethtool \
+    iproute2 \
+    iptables \
+    libc6-compat \
+    musl \
+    socat \
+    util-linux \
+    && true
+# Remove apk residuals. We have a read-only rootfs, so apk is of no use.
+RUN rm -rf /out/etc/apk /out/lib/apk /out/var/cache
+
+ADD kubelet.sh /out/usr/bin/kubelet.sh
+ADD kubeadm-init.sh /out/usr/bin/kubeadm-init.sh
+
+RUN curl -fSL -o /tmp/cni.tgz https://dl.k8s.io/network-plugins/cni-amd64-${cni_version}.tar.gz && \
+    mkdir -p /out/opt/cni /out/etc/cni/net.d && \
+    tar -xzf /tmp/cni.tgz -C /out/opt/cni
+RUN curl -fSL -o /out/etc/weave.yaml https://cloud.weave.works/k8s/v1.6/net?v=${weave_version} 
+RUN curl -fSL -o /out/usr/bin/kubelet https://dl.k8s.io/${kubernetes_version}/bin/linux/amd64/kubelet && chmod 0755 /out/usr/bin/kubelet
+RUN curl -fSL -o /out/usr/bin/kubeadm https://dl.k8s.io/${kubernetes_version}/bin/linux/amd64/kubeadm && chmod 0755 /out/usr/bin/kubeadm
+RUN curl -fSL -o /out/usr/bin/kubectl https://dl.k8s.io/${kubernetes_version}/bin/linux/amd64/kubectl && chmod 0755 /out/usr/bin/kubectl
+
+FROM scratch
+WORKDIR /
+ENTRYPOINT ["/usr/bin/kubelet.sh"]
+COPY --from=build /out /
+ENV KUBECONFIG "/etc/kubernetes/admin.conf"

projects/kubernetes/kubernetes/Makefile

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+ORG?=linuxkitprojects
+IMAGE=kubernetes
+NETWORK=1
+NOTRUST=1
+
+include ../../../pkg/package.mk

projects/kubernetes/kubernetes/kubeadm-init.sh

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+#!/bin/sh
+kubeadm init --skip-preflight-checks --kubernetes-version v1.6.1 && kubectl create -n kube-system -f /etc/weave.yaml

projects/kubernetes/kubernetes/kubelet.sh

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+#!/bin/sh
+mount --bind /opt/cni /rootfs/opt/cni && mount --bind /etc/cni /rootfs/etc/cni && until kubelet --kubeconfig=/var/lib/kubeadm/kubelet.conf --require-kubeconfig=true --pod-manifest-path=/var/lib/kubeadm/manifests --allow-privileged=true --cluster-dns=10.96.0.10 --cluster-domain=cluster.local --cgroups-per-qos=false --enforce-node-allocatable= --network-plugin=cni --cni-conf-dir=/etc/cni/net.d --cni-bin-dir=/opt/cni/bin ; do [ ! -e /dev/sr0 ] && sleep 1 || (mount -o ro /dev/sr0 /mnt && kubeadm join --skip-preflight-checks $(cat /mnt/config)) ; done