Introduction to Kubernetes: Deploying a Simple Application

Introduction to Kubernetes

Kubernetes is a popular container orchestration platform that helps you deploy and manage containerized applications. In this tutorial, we will learn how to deploy a simple application using Kubernetes.

Step 1: Install Kubernetes

To get started with Kubernetes, you need to install it on your machine. You can download the Kubernetes installer from the official Kubernetes website.

# Install Kubernetes on Ubuntu-based systems
sudo apt update
sudo apt install kubeadm -y

Step 2: Create a Deployment

Once Kubernetes is installed, we can create a deployment. A deployment is a YAML file that defines the application to be deployed.

# deployment.yml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: hello-world
spec:
  replicas: 3
  selector:
    matchLabels:
      app: hello-world
  template:
    metadata:
      labels:
        app: hello-world
    spec:
      containers:
      - name: hello-world
        image: gcr.io/codelab-184332/monolith:1.0.0
        ports:
        - containerPort: 80

Step 3: Apply the Deployment

Now that we have the deployment YAML file, we can apply it using the kubectl command.

# Apply the deployment
kubectl apply -f deployment.yml

In this tutorial, we learned how to install Kubernetes, create a deployment, and apply it using the kubectl command. With this knowledge, you can deploy your applications using Kubernetes and manage them using pods, services, and deployments.