What is KIND and how to setup multi-node cluster in Kubernetes using KIND

KIND (Kubernetes IN Docker) is a tool that allows you to run Kubernetes single or multi node clusters in Docker containers. It's mainly used for:

• Local Kubernetes development and testing.
• CI/CD pipelines.
• Running Kubernetes clusters in isolated environments without requiring a cloud provider or complex setup.
  
  
  

Step-by-Step Installation Guide on Ubuntu:

1. Use Step 1-8 to install docker using following link.

    https://devopsbyashish.blogspot.com/2025/01/how-to-install-docker-in-ubuntu.html

2. Install kubectl

    sudo snap install kubectl --classic

3. Install KIND.

    curl -Lo ./kind "https://kind.sigs.k8s.io/dl/latest/kind-linux-amd64"

    chmod +x ./kind

    sudo mv ./kind /usr/local/bin/kind

4. Create a Multi-Node Cluster: For a multi-node setup, create a configuration file:-

    a. create and save file  kindmultinode.yaml using below:

*********************************************************************************

kind: Cluster

apiVersion: kind.x-k8s.io/v1alpha4

nodes:

  - role: control-plane

    kubeadmConfigPatches:

      - |

        apiVersion: kubeadm.k8s.io/v1beta2

        kind: InitConfiguration

        nodeRegistration:

          kubeletExtraArgs:

            node-labels: "ingress-ready=true"

            authorization-mode: "AlwaysAllow"

    extraPortMappings:

      - containerPort: 80

        hostPort: 80

      - containerPort: 443

        hostPort: 443

  - role: worker

  - role: worker

 *********************************************************************************

        b. run  following command 

            kind create cluster --config=kindmultinode.yaml

                    

    5. Verify node.
            kubectl get nodes