kubernetes-playground.md

Kubernetes Playground

Note

Login on https://labs.play-with-k8s.com/ and follow below steps

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 # optional for listed playground as it comes with pre-installed

kubeadm join 192.168.0.8:6443 --token c2ioq4.hy4ysw7ipf8a9svf --discovery-token-ca-cert-hash sha256:d507dc03285b97e1442dff82c07c7c623b4ac3d73379ca0cd954128a67f58423

6. 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