(K8s) Kubernetes lab 102 Pods with kubectl Commands

1. Overview

2. Demo

In case you prefer a video, check below our YouTube video for this lab

3. Create Kubernetes cluster

Task: Create Kubernetes cluster with 3 worker nodes.

Master: 1 node

Worker: 2 node

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 node

kubeadm init --apiserver-advertise-address $(hostname -i) --pod-network-cidr 10.5.0.0/16

enter below command on first node

kubectl apply -f https://raw.githubusercontent.com/cloudnativelabs/kube-router/master/daemonset/kubeadm-kuberouter.yaml

capture 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

4. Create a Pod with Kubectl

Task: Create a pod with name web and image nginx

name: web

image: nginx

Use Kubectl command

verify with below command

kubectl get pods

kubectl run web --image=nginx

5. Delete pod with kubectl

Task: Delete pod you created in previous step using kubectl

verify with below command

kubectl get pods

kubectl delete pod web

6. Expose pod port with kubectl

Task: Create a pod using Kubectl and expose port

name: web

image: nginx

port: 80

verify with below command

kubectl get all

kubectl run web --image=nginx --port=80

7. 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 all

 kubectl expose pod web --port 80 --name=nginx-svc --type=NodePort --target-port=80

8. Find port used by Nodeport

Task: Find port used by nodeport service in Kubernetes to expose container

kubectl get all

9. Access container port

Task: Access container port using browser

10. Create NodePort service

Task: Create nodeport service using kubectl command

name: nginx-svc

container port: 80

target port: 80

nodeport: 3001

verify with below command

kubectl get svc

kubectl create service nodeport nginx-svc1 --tcp=80:80 --node-port=30001

11. add label to pod

Task: Try accessing nodeport using URL with port 30001

It will not work as nodeport service require label to match container

Add label to get nodeport service working

verify with below command

kubectl describe svc nginx-svc1

 kubectl label pod web app=nginx-svc1

12. Access container port using nodeport

Task: Access container port using browser

13. Get yaml for creating pod

Task: Use kubectl command to generate yaml for creating a pod

name: web

image: nginx

kubectl run web --image=nginx  --dry-run=client -o yaml

14. Find node where pod is running

Task: Which node is pod running on?

kubectl get pods -o wide

15. Delete pod with kubectl

Task: Delete pod you created in previous step using kubectl

verify with below command

kubectl get pods

kubectl delete pod web

16. Cleanup

Task: Delete all open nodes/instances and close session

1. Select the node and click on DELETE
2. Repeat same for any other open nodes
3. click close session

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17. Conclusion

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