[CKA] 문제풀이 - Cluster Upgrade - only Master

 

 

 

문제 

작업 클러스터 : kubelet config use-context k8s

upgrade system : hk8s-m

Given an existing Kubernetes cluster running version 1.22.4 ,

upgrade all of the Kubernetes control plane and node components on the master node only to version 1.23.3 

Be sure to drain the master node before upgrading it and uncordon it after the upgrade. 

 

 

클러스터 변경하기 

kubelet config use-context hk8s-m

 

 

kubeadm 업그레이드

https://kubernetes.io/docs/tasks/administer-cluster/kubeadm/kubeadm-upgrade/

## Ubuntu
# replace x in 1.23.x-00 with the latest patch version
apt-mark unhold kubeadm && \
apt-get update && apt-get install -y kubeadm=1.23.x-00 && \
apt-mark hold kubeadm

## CentOS
# replace x in 1.23.x-0 with the latest patch version
yum install -y kubeadm-1.23.x-0 --disableexcludes=kubernetes

 

node components 업그레이드 

sudo kubeadm upgrade plan v1.23.3
sudo kubeadm upgrade apply v1.23.3

 

 

노드 드레인 

kubectl drain hk8s-m --ignore-daemonsets

https://kubernetes.io/docs/tasks/administer-cluster/kubeadm/kubeadm-upgrade/

 

 

 

kubelet과 kubectl 업그레이드

## Ubuntu
# replace x in 1.27.x-00 with the latest patch version
apt-mark unhold kubelet kubectl && \
apt-get update && apt-get install -y kubelet=1.27.x-00 kubectl=1.27.x-00 && \
apt-mark hold kubelet kubectl

## CentOS
# replace x in 1.27.x-0 with the latest patch version
yum install -y kubelet-1.27.x-0 kubectl-1.27.x-0 --disableexcludes=kubernetes

https://kubernetes.io/docs/tasks/administer-cluster/kubeadm/kubeadm-upgrade/#upgrade-kubelet-and-kubectl 

 

 

 

kubelet 재시작하기 

sudo systemctl daemon-reload
sudo systemctl restart kubelet

 

 

노드 uncordon

sudo kubelet uncordon hk8s-m