Kubernetes in 30 mins

What is kubernetes ?

Kubernetes is an open-source platform for automating the deployment, scaling, and management of containerized applications. It provides a way to manage multiple containers as a single unit, making it easier to build, deploy, and manage complex, multi-tier applications.

set up a Kubernetes cluster
  1. Install Kubernetes: You can install Kubernetes on a single node using a tool like Minikube, or on multiple nodes in a production environment using a tool like Google Kubernetes Engine (GKE) or Amazon Elastic Kubernetes Service (EKS).
  2. Initialize the cluster: Once you have Kubernetes installed, you need to initialize the cluster by running the kubeadm init command. This will set up the master node and create a cluster configuration file.
  3. Join worker nodes: If you’re running a multi-node cluster, you need to join worker nodes to the cluster using the kubeadm join command.
  4. Deploy applications: You can deploy applications on a Kubernetes cluster using manifests, which are YAML files that define the resources you want to create. For example, you can use a Deployment manifest to define a set of replicas of a containerized application, and a Service manifest to expose the application to the network.

components of a Kubernetes cluster
  1. Master node: This is the node that controls the cluster and manages the configuration. It runs the API server, scheduler, and controller manager.
  2. Worker nodes: These are the nodes that run your containers. Each worker node runs a kubelet, which communicates with the master node and manages the containers on that node.
  3. Pods: These are the smallest deployable units in Kubernetes, and they contain one or more containers.
  4. Services: These provide network connectivity to the pods in a cluster, and they allow you to access your applications from outside the cluster.
  5. Deployments: These manage the deployment and scaling of your applications, and they ensure that a specified number of replicas of your application are running at all times.


Here’s an example of how you can deploy a Java application on a Kubernetes cluster using Docker:

  1. Build a Docker image of your Java application and push it to a Docker registry. You can find in our docker tutorial. on how to create docker image.
  2. Create a Deployment manifest that specifies the image to use, the number of replicas, and the resources needed by the containers.
  1. Create a Service manifest that exposes the deployment to the network.
  1. Apply the manifests to your cluster using the kubectl apply command.
  1. Verify that the deployment and service have been created successfully.
  1. Get the IP address of the service using the kubectl get command.
  1. Access the application using a web browser or a command-line tool like curl, using the IP address and port of the service.

This is just a basic example of how to deploy a Java application on a Kubernetes cluster using Docker, and there are many other things you can do with Kubernetes to manage and scale your applications. Kubernetes is a powerful and flexible platform, and there are many resources available online to help you learn more about it and get started with deploying your own applications.

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