About this Lab
1. Overview
#### In this lab we will practice doing a version upgrade on a Kubernetes cluster using KubeadmAgenda
In this lab we will upgrade Kubernetes cluster
you can only upgrade from one minor version at a time.
Lets Practice
2. Create Kubernetes cluster
Task: Create Kubernetes cluster with 3 worker nodes.
Master: 1 node
Worker: 2 node
Hint
Solution
Create docker hub account. Docker Hub if you already have one skip this step
Open Play with Kubernetes login with your docker hub account.
Click on start
It will start a 4 hr session
create three instance
click on + ADD NEW INSTANCE three time to add three instances
on first instance enter below command, this node will be master nodekubeadm init --apiserver-advertise-address $(hostname -i) --pod-network-cidr 10.5.0.0/16enter below command on first node
kubectl apply -f https://raw.githubusercontent.com/cloudnativelabs/kube-router/master/daemonset/kubeadm-kuberouter.yamlcapture output of kubeadm join XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
enter captured command in second and third node
kubeadm join XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Check node status, all 3 nodes should be in ready state
3. Create a Pod
Task: Create a pod with below details using kubectl
name: web
image: nginx
Use Kubectl command
verify with below command
kubectl get podsSolution
this command will create pod with image nginx and name web
kubectl run web --image=nginx4. Create a Deployment
Task: Create a deployment with following details:
name: demo
image: nginx
Use Kubectl command
verify with below command
kubectl create deployment demo --image=nginx
Solution
this command will create a deployment with name demo and image nginx
kubectl run web --image=nginx5. Expose pod port outside cluster
Task: Create a pod using Kubectl and expose port, port should be accessible from outside Kubernetes cluster
name: web
image: nginx
port: 80
verify with below command
kubectl get allSolution
kubectl expose pod web --port 80 --name=nginx-svc --type=NodePort --target-port=80
6. Find port used by Nodeport
Task: Find port used by nodeport service in Kubernetes to expose container
Solution
kubectl get all
7. Check Kubernetes version
Task: Check Kubernetes version running on all nodes
Solution
kubectl get nodes
11. list Kubeadm versions
Task: List available Kubeadm version on master node
Solution
yum list --showduplicates kubeadm --disableexcludes=kubernetes
yum list --showduplicates kubeadm --disableexcludes=kubernetes | grep <use the version of interest>
find 1.x.x
12. Upgrade Kubeadm, Kubelet, Kubectl
Task: Upgrade Kubeadm, Kubelet, Kubectl version running on master nodes
Solution
yum install -y kubeadm-1.X.x-x kubelet-1.X.x-x kubectl-1.X.x-x --disableexcludes=kubernetes
13. Verify upgrade
Task: Verify upgrade performed in previous step
Solution
kubeadm version
kubelet --version
kubectl version
14. Take node to maintenance mode
Task: Take node1 to maintenance mode
Solution
kubectl drain node1 --ignore-daemonsets
16. Upgrade kubernetes control plane
Task: Upgrade Kubernetes cluster
Solution
kubeadm upgrade apply v1.x.x
18. Upgrade kubernetes CNI
Task: Upgrade CNI
Solution
kubectl apply -f https://raw.githubusercontent.com/cloudnativelabs/kube-router/master/daemonset/kubeadm-kuberouter.yaml19. Restart kubelet
Task: Restart kubelet on node 1
Solution
systemctl daemon-reload && systemctl restart kubelet
21. Bring node back from maintainence mode
Task: Bring node1 back from maintainence mode
Solution
kubectl uncordon node1
23. Cleanup
Task: Delete all open nodes/instances and close session
- Select the node and click on DELETE
- Repeat same for any other open nodes
- click close session
}}