How to Set HostPort in Kubernetes

Kubernetes is an open-source container orchestration platform that enables you to manage and deploy containerized applications at scale. One of the essential features of Kubernetes is the ability to expose your containers to the outside world through different network modes. HostPort is one of the network modes that allows you to expose your container's port on the host machine's IP address and port. In this article, we will walk you through the steps to set HostPort in Kubernetes.

Prerequisites:

• A running Kubernetes cluster.
• kubectl command-line tool installed and configured to connect to your cluster.

Step 1: Create a Pod YAML file

The first step is to create a YAML file that describes your Pod configuration. Here's an example YAML file that creates a Pod with HostPort set to 8080:

apiVersion: v1
kind: Pod
metadata:
  name: myapp-pod
spec:
  containers:
  - name: myapp-container
    image: myapp-image
    ports:
    - containerPort: 8080
      hostPort: 8080

Save the YAML file with any name, for example, myapp-pod.yaml.

Step 2: Deploy the Pod

To deploy the Pod, run the following command:

kubectl apply -f myapp-pod.yaml

This command will create a Pod with HostPort set to 8080.

Step 3: Verify the Pod

To verify that the Pod is running and HostPort is set correctly, run the following command:

kubectl get pods myapp-pod

This command will display the status of the Pod. Look for the "STATUS" column, and it should be "Running."

Step 4: Access the Pod

To access the Pod, you need to know the IP address of the host machine where the Pod is running. To find the IP address, run the following command:

kubectl get pods myapp-pod -o wide

This command will display the IP address of the host machine in the "NODE" column.

Now, you can access the Pod by using the IP address and HostPort in your web browser or any other client application. For example, if the IP address of the host machine is 192.168.1.100, you can access the Pod at http://192.168.1.100:8080.

Congratulations! You have successfully set HostPort in Kubernetes.

More Examples:

• You can set multiple HostPorts in a single Pod YAML file by specifying multiple "ports" sections under the "containers" section.
• You can set HostPort in a Deployment YAML file by adding the "hostPort" field under the "spec.template.spec.containers.ports" section.

In this article, we have explained how to set HostPort in Kubernetes. HostPort is a powerful feature that enables you to expose your container's port on the host machine's IP address and port. We hope this article has been helpful, and you can now use HostPort to expose your containerized applications in Kubernetes.

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That's it for this post. Keep practicing and have fun. Leave your comments if any.