Create a Multi-Node Kubernetes Cluster Inside Docker Using kind in 1 Minute

Setting up a Kubernetes cluster can be quick and easy with Kind (Kubernetes IN Docker). In just 1 minute, you can have a multi-node Kubernetes cluster running inside Docker, perfect for development and testing.

Install Docker:

sudo apt update

sudo apt install apt-transport-https ca-certificates curl software-properties-common

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg

echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] 
https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

sudo apt update

sudo apt install docker-ce docker-ce-cli containerd.io

Install Kind:

curl -Lo ./kind https://kind.sigs.k8s.io/dl/v0.17.0/kind-linux-amd64

chmod +x ./kind

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

Create Cluster Inside Docker:
Define the cluster configuration:

# kind-config.yaml
kind: Cluster
apiVersion: kind.x-k8s.io/v1alpha4
nodes:
  - role: control-plane
  - role: worker

Create the cluster:
kind create cluster --config kind-config.yaml

Install kubectl using Snap:
sudo snap install kubectl --classic

Verify & Manage:
kubectl get nodes

Create a Simple Pod - Deploy a basic Nginx pod:
kubectl run nginx --image=nginx --port=80

Verify the pod is running:
kubectl get pods

Clean Up:

kind delete cluster

This quick setup allows you to create and manage Kubernetes clusters inside Docker effortlessly. It's perfect for rapidly deploying and testing applications, with the simplicity of managing both the cluster and pods in minutes.