クラスタの Upgrade

master の upgrade

master node を drain

$ kubectl drain master --ignore-daemonsets

kubeadm の upgrade

$ apt install kubeadm=1.12.0-00
$ kubeadm upgrade apply v1.12.0

kubelet の upgrade

$ apt install kubelet=1.12.0-00

// (なんかこれ不要だった)
// $ systemctl restart lubelet

$ kubelet --version
Kubernetes v1.12.0

mater を schedulable に戻す

$ kubectl uncordon master

worker の upgrade

worker を drain

master $ kubectl drain node01 --ignore-daemonsets

worker 側での作業

master $ ssh 172.17.0.16
worker $ apt install kubeadm=1.12.0-00
worker $ apt install kubelet=1.12.0-00
worker $ kubeadm upgrade node config --kubelet-version v1.12.0

// 以下のコマンドでもいける
// $ kubeadm upgrade node config --kubelet-version $(kubelet --version | cut -d ' ' -f 2)

master 側から確認

master $ kubectl get nodes
NAME      STATUS                     ROLES     AGE       VERSION
master    Ready                      master    25m       v1.12.0
node01    Ready,SchedulingDisabled   <none>    25m       v1.12.0

schedulable に戻す

master $ kubectl uncordon node01
node/node01 uncordoned