Add playground info

README.md

@@ -9,6 +9,8 @@ This repository provides an easy-to-deploy, open-source solution for anyone look
 Feel free to explore the codebase and leverage the powerful technologies used in this project for your own URL shortening needs.
 
 > [!IMPORTANT]  
+> To practice important concepts first follow [kubernetes-playground](./kubernetes-playground.md)
+>
 > For step wise guidelines please follow [Step Wise Guidelines](./step-wise-guideline.md)
 
 ## Database setup

kubernetes-playground.md

@@ -0,0 +1,65 @@
+### Kubernetes Playground
+
+1.  Initializes cluster master node:
+
+kubeadm init --apiserver-advertise-address $(hostname -i) --pod-network-cidr 10.5.0.0/16
+
+2.  Initialize cluster networking:
+
+kubectl apply -f https://raw.githubusercontent.com/cloudnativelabs/kube-router/master/daemonset/kubeadm-kuberouter.yaml
+
+3. Add another instance
+
+4. Create join token
+
+```
+kubeadm token create --print-join-command
+```
+
+5. Join the node to cluster(replace below with the output from step 4)
+
+> [!IMPORTANT]
+> Every worker node must have kubelet installed and running as a system service. Please install kubelet on the target node before executing the join command.
+
+```
+sudo apt install kubeadm kubelet kubectl
+
+```
+
+```
+kubeadm join 192.168.0.8:6443 --token c2ioq4.hy4ysw7ipf8a9svf --discovery-token-ca-cert-hash sha256:d507dc03285b97e1442dff82c07c7c623b4ac3d73379ca0cd954128a67f58423
+```
+
+1. List nodes on master
+
+```
+kubectl get nodes
+```
+
+7. List pods on specific nodes
+
+```
+kubectl get pods --field-selector spec.nodeName=node2
+```
+
+8. Deploy nginx app
+
+```
+kubectl apply -f https://raw.githubusercontent.com/kubernetes/website/master/content/en/examples/application/nginx-app.yaml
+```
+
+> [!NOTE]
+> List and verify the pods on both node1(master) and node2(worker)
+> Pods should be running on worker nodes only
+
+9. Get system level components
+
+```
+kubectl get pods -n kube-system
+```
+
+10. Get the system level components on a specific node
+
+```
+kubectl get pods -n kube-system --field-selector spec.nodeName=node2
+```