15-20 Tasks. 17 for me. 2 hours. ~ 3 clusters. Context change commands are given. ControlPlane + 2 Nodes.

Add to .bashrc

alias k=kubectl # will already be pre-configured

export do="--dry-run=client -o yaml" # k create deploy nginx --image=nginx $do //useful

export now="--force --grace-period 0" # k delete pod x $now //not very

k get nodes -o jsonpath={".items[*].spec.podCIDR"}

k get nodes -o json | jq ".items[].spec.podCIDR"

k get nodes -o jsonpath={".items[*].status.nodeInfo.osImage"}

k get nodes -o json | jq ".items[].status.nodeInfo.osImage"

kubectl run nginx --image=nginx

kubectl run nginx --image=nginx --labels=env=prod --dry-run=client -o yaml > nginx_pod.yaml

kubectl create deploy --image=nginx nginx

kubectl create deploy --image=nginx nginx --dry-run=client -o yaml > nginx-deployment.yaml

To create a daemonset, use Create deployment template file and change the kind and remove replicas & strategy.

kubectl apply -f https://k8s.io/examples/pods/storage/pv-volume.yaml

kubectl expose pod valid-pod --port=444 --name=frontend

kubectl create configmap app-config --from-literal=env=dev

kubectl create secret generic app-secret --from-literal=pass=123

1. Controlplane apt update apt upgrade kubeadm=1.26.0-00 kubeadm upgrade plan kubeadm upgrade apply v1.26.0

2. Worker Nodes apt update apt upgrade kubeadm=1.26.0-00 kubeadm upgrade node

3. Kubelet/Kubectl(all nodes) apt-get install -y kubelet=1.26.0-00 kubectl=1.26.0-00 systemctl daemon-reload systemctl restart kubelet

1. snapshot
2. restore