From b2c91a2983be3db34ad44ed28603d6a4cff7107e Mon Sep 17 00:00:00 2001
From: Sujeet Agrahari <sujeet.rgcsm@gmail.com>
Date: Thu, 29 Feb 2024 08:25:15 +0530
Subject: [PATCH] Add playground info

---
 README.md                |  2 ++
 kubernetes-playground.md | 72 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 74 insertions(+)
 create mode 100644 kubernetes-playground.md

diff --git a/README.md b/README.md
index 08ab15c..b17c49d 100644
--- a/README.md
+++ b/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
diff --git a/kubernetes-playground.md b/kubernetes-playground.md
new file mode 100644
index 0000000..d1e0683
--- /dev/null
+++ b/kubernetes-playground.md
@@ -0,0 +1,72 @@
+# Kubernetes Playground
+
+> [!NOTE]
+> Login on https://labs.play-with-k8s.com/ and follow below steps
+
+### 1. Initializes cluster master node:
+
+```sh
+kubeadm init --apiserver-advertise-address $(hostname -i) --pod-network-cidr 10.5.0.0/16
+```
+
+### 2. Initialize cluster networking:
+
+```sh
+kubectl apply -f https://raw.githubusercontent.com/cloudnativelabs/kube-router/master/daemonset/kubeadm-kuberouter.yaml
+```
+
+### 3. Add another instance
+
+### 4. Create join token
+
+```sh
+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.
+
+```sh
+sudo apt install kubeadm kubelet kubectl # optional for listed playground as it comes with pre-installed
+
+```
+
+```sh
+kubeadm join 192.168.0.8:6443 --token c2ioq4.hy4ysw7ipf8a9svf --discovery-token-ca-cert-hash sha256:d507dc03285b97e1442dff82c07c7c623b4ac3d73379ca0cd954128a67f58423
+```
+
+### 6. List nodes on master
+
+```sh
+kubectl get nodes
+```
+
+### 7. List pods on specific nodes
+
+```sh
+kubectl get pods --field-selector spec.nodeName=node2
+```
+
+### 8. Deploy nginx app
+
+```sh
+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
+
+```sh
+kubectl get pods -n kube-system
+```
+
+### 10. Get the system level components on a specific node
+
+```sh
+kubectl get pods -n kube-system --field-selector spec.nodeName=node2
+```