Kubernetes/Cluster Patch Upgrade at main · hammad-hub/Kubernetes · GitHub

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https://github.com/hammad-hub/Kubernetes/issues/1#issue-795642133

https://user-images.githubusercontent.com/74447461/106087330-9b525a00-60d8-11eb-9f37-f86c22e9da60.jpg

Master Node Upgrade Process (Patch Version)
--------------------------------------------
https://v1-18.docs.kubernetes.io/docs/tasks/administer-cluster/kubeadm/kubeadm-upgrade/

Step-1:
------
kubeadm version

Step-2:
-------
sudo apt update

Step-3:
-----
apt-cache policy kubeadm | grep 1.18

Step-4:
------
sudo apt-mark unhold kubeadm kubelet kubectl && \
      sudo apt-get update && \
      sudo apt-get install -y kubeadm=1.18.13-00 kubelet=1.18.13-00 kubectl=1.18.13-00 && \
      sudo apt-mark hold kubeadm kubelet kubectl

Step-5:
------
kubeadm version


Step-6:
--------
sudo kubectl drain kmaster --ignore-daemonsets

Step-7:
-------
kubectl get nodes

Step-8:
-------
sudo kubeadm upgrade plan

Step-9:
------
sudo kubeadm upgrade apply v1.18.13

Step-10:
-------
sudo kubectl uncordon kmaster

Step-11:
-------
kubectl get nodes


Note:
-----
kubectl apply -f "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 | tr -d '\n')"
then delete all weave-net pods from kube-system


Worker Node Upgrade Process (Worker1)
------------------------------------
Step-1:
------
ssh osboxes@Worker-Node-IP

Step-2:
------
kubeadm version

Step-3:
------
sudo apt update

Step-4:
------
sudo apt-cache policy kubeadm | grep 1.18

Step-5:
------
sudo apt-mark unhold kubeadm kubelet kubectl && \
      sudo apt-get update && \
      sudo apt-get install -y kubeadm=1.18.13-00 kubelet=1.18.13-00 kubectl=1.18.13-00 && \
      sudo apt-mark hold kubeadm kubelet kubectl

Step-6:
------
sudo kubectl drain kworker1 --ignore-daemonsets (Run On Master Node)

Step-7:
------
sudo kubeadm upgrade node

Step-9:
------
exit from ssh session

Step-10:
-------
sudo kubectl uncordon kworker1 (Run On Master Node)

Step-11:
--------
kubectl get nodes


Worker Node Upgrade Process (Worker2)
--------------------------------------
do yourself