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kubernetes: adjust for v1.8 bootstrapping arrangements.

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With kube 1.8 kubeadm initially configures worker nodes with a
bootstrap-kubelet.conf. Adjust our start of day scripting to DTRT.

Signed-off-by: Ian Campbell <ijc@docker.com>
This commit is contained in:
Ian Campbell 2017-10-03 14:53:03 +01:00
parent f85208c74a
commit 57a2ae4318
1 changed files with 11 additions and 7 deletions
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18
projects/kubernetes/kubernetes/kubelet.sh
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@ -11,9 +11,9 @@ if [ -e /etc/kubelet.sh.conf ] ; then
. /etc/kubelet.sh.conf . /etc/kubelet.sh.conf
fi fi
conf=/etc/kubernetes/kubelet.conf await=/etc/kubernetes/kubelet.conf
if [ -f "${conf}" ] ; then if [ -f "/etc/kubernetes/kubelet.conf" ] ; then
echo "kubelet.sh: kubelet already configured" echo "kubelet.sh: kubelet already configured"
elif [ -e /var/config/kubeadm/init ] ; then elif [ -e /var/config/kubeadm/init ] ; then
echo "kubelet.sh: init cluster with metadata \"$(cat /var/config/kubeadm/init)\"" echo "kubelet.sh: init cluster with metadata \"$(cat /var/config/kubeadm/init)\""
@ -23,26 +23,30 @@ elif [ -e /var/config/kubeadm/init ] ; then
elif [ -e /var/config/kubeadm/join ] ; then elif [ -e /var/config/kubeadm/join ] ; then
echo "kubelet.sh: joining cluster with metadata \"$(cat /var/config/kubeadm/join)\"" echo "kubelet.sh: joining cluster with metadata \"$(cat /var/config/kubeadm/join)\""
kubeadm join --skip-preflight-checks $(cat /var/config/kubeadm/join) kubeadm join --skip-preflight-checks $(cat /var/config/kubeadm/join)
await=/etc/kubernetes/bootstrap-kubelet.conf
elif [ -e /var/config/userdata ] ; then elif [ -e /var/config/userdata ] ; then
echo "kubelet.sh: joining cluster with metadata \"$(cat /var/config/userdata)\"" echo "kubelet.sh: joining cluster with metadata \"$(cat /var/config/userdata)\""
kubeadm join --skip-preflight-checks $(cat /var/config/userdata) kubeadm join --skip-preflight-checks $(cat /var/config/userdata)
await=/etc/kubernetes/bootstrap-kubelet.conf
fi fi
echo "kubelet.sh: waiting for ${conf}" echo "kubelet.sh: waiting for ${await}"
# TODO(ijc) is there a race between kubeadm creating this file and # TODO(ijc) is there a race between kubeadm creating this file and
# finishing the write where we might be able to fall through and # finishing the write where we might be able to fall through and
# start kubelet with an incomplete configuration file? I've tried # start kubelet with an incomplete configuration file? I've tried
# to provoke such a race without success. An explicit # to provoke such a race without success. An explicit
# synchronisation barrier or changing kubeadm to write # synchronisation barrier or changing kubeadm to write
# kubelet.conf atomically might be good in any case. # kubelet.conf atomically might be good in any case.
until [ -f "${conf}" ] ; do until [ -f "${await}" ] ; do
sleep 1 sleep 1
done done
echo "kubelet.sh: ${conf} has arrived" 2>&1 echo "kubelet.sh: ${await} has arrived" 2>&1
exec kubelet --kubeconfig=${conf} \ mkdir -p /etc/kubernetes/manifests
--require-kubeconfig=true \
exec kubelet --kubeconfig=/etc/kubernetes/kubelet.conf \
--bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf \
--pod-manifest-path=/etc/kubernetes/manifests \ --pod-manifest-path=/etc/kubernetes/manifests \
--allow-privileged=true \ --allow-privileged=true \
--cluster-dns=10.96.0.10 \ --cluster-dns=10.96.0.10 \