Install Elasticsearch on Kubernetes Using Helm Chart

Kubernetes is a powerful container orchestration tool that helps to automate the deployment, scaling, and management of containerized applications. Elasticsearch is a distributed search and analytics engine that can be used to perform complex searches and data analysis. In this article, we will discuss how to install Elasticsearch on Kubernetes using the Helm chart.

Introduction

Helm is a package manager for Kubernetes that allows you to install, upgrade, and manage applications on a Kubernetes cluster. The Helm chart for Elasticsearch is a predefined set of Kubernetes resources that can be used to deploy and manage Elasticsearch on a Kubernetes cluster. The chart includes the Elasticsearch deployment, service, and a set of configurations that can be customized based on your requirements.

Table of Contents

1. Prerequisites
2. Installing Helm
3. Installing Elasticsearch using Helm
4. Accessing Elasticsearch

Prerequisites

Before you start the installation process, ensure that you have the following prerequisites:

• A running Kubernetes cluster
• kubectl command-line tool installed
• Helm package manager installed

Installing Helm

To install Helm, follow the steps given below:

1. Download the Helm binary from the official Helm website using the following command:

   $ curl https://raw.githubusercontent.com/helm/helm/master/scripts/get-helm-3 | bash
   

2. Verify the installation by running the following command:

   $ helm version
   

   This should display the version of Helm installed on your system.

Installing Elasticsearch using Helm

To install Elasticsearch on Kubernetes using the Helm chart, follow the steps given below:

1. Add the Elasticsearch Helm chart repository using the following command:

   $ helm repo add elastic https://helm.elastic.co
   

2. Update the Helm chart repository using the following command:

   $ helm repo update
   

3. Install Elasticsearch using the following command:

   $ helm install elasticsearch elastic/elasticsearch
   

4. Verify that the Elasticsearch pod is running using the following command:

   $ kubectl get pods
   

   This should display the status of the Elasticsearch pod.

Accessing Elasticsearch

To access Elasticsearch, follow the steps given below:

1. Check the Elasticsearch service using the following command:

   $ kubectl get svc
   

   This should display the Elasticsearch service and its external IP address.

2. Open your web browser and enter the Elasticsearch external IP address in the address bar.

3. You should see the Elasticsearch welcome page.

More Examples:

The Helm chart for Elasticsearch can be customized based on your requirements. For example, you can customize the following parameters:

• Number of Elasticsearch replicas
• Elasticsearch image version
• Volume size and storage class
• Resource limits and requests
• Elasticsearch configuration options

To customize the Helm chart, you can create a values.yaml file and specify the desired values. For example, to set the number of Elasticsearch replicas to 3, create a values.yaml file with the following content:

replicas: 3

Then, install Elasticsearch using the following command:

$ helm install elasticsearch elastic/elasticsearch -f values.yaml

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