How to Install Elasticsearch: A Step-by-Step Tutorial

This easy-to-follow guide will walk you through the complete process of setting up and running Elasticsearch on your server.

gunicorn

Introduction to Modern Data Search

Linux

Understanding What Elasticsearch Is

Elasticsearch is a highly popular, open-source search and analytics engine used by developers around the world. It is built on top of a powerful technology called Apache Lucene. Instead of storing data in traditional tables like a standard database, Elasticsearch stores information in a way that makes searching through massive amounts of text incredibly fast.

At its core, Elasticsearch works by saving data as organized text files called JSON documents. When you add data to it, the engine creates a special map of words called an "inverted index." This index works much like the glossary at the back of a textbook, allowing the system to instantly find which document contains the exact word or data you are looking for.

People use Elasticsearch for many different reasons in the real world. It is the perfect tool if you need to add a fast search bar to your website, monitor computer system logs in real-time, or analyze large sets of business data. Because it is designed to run across multiple computers at once, it can easily handle massive amounts of information without slowing down.

Prerequisites

  • A computer or server running a Debian or Ubuntu Linux operating system.
  • A user account with sudo (administrator) privileges.
  • At least 4GB of memory (RAM) available on your system.
  • Access to your system's command-line terminal.
  • A stable internet connection to download the required files.

Step-by-Step Installation

1

Import the Elasticsearch PGP Key

First, you need to download the official security key so your system knows the files are safe and actually come from Elastic. Run this command:
BASH 
wget -qO - https://artifacts.elastic.co/GPG-KEY-elasticsearch | sudo gpg --dearmor -o /usr/share/keyrings/elasticsearch-keyring.gpg
2

Install APT Transport HTTPS

Next, install a small tool that allows your server to safely download files over a secure web connection (HTTPS):
BASH 
sudo apt-get install apt-transport-https -y
3

Add the Elasticsearch Repository

Now, you need to tell your computer exactly where to find the Elasticsearch software. This command adds the official download link to your system:
BASH 
echo "deb [signed-by=/usr/share/keyrings/elasticsearch-keyring.gpg] https://artifacts.elastic.co/packages/8.x/apt stable main" | sudo tee /etc/apt/sources.list.d/elastic-8.x.list
4

Install Elasticsearch

Update your system's list of available software, and then install the Elasticsearch program:
Bash 
sudo apt-get update
sudo apt-get install elasticsearch -y
Important Note: When this installation finishes, look closely at your terminal screen.
Elasticsearch will automatically create a password for the main elastic user. Copy and save this password immediately, as you will need it later!
5

Start and Enable the Elasticsearch Service

Tell your computer to recognize the new software, set it to start automatically if your computer restarts, and then turn it on:
Bash 
sudo systemctl daemon-reload
sudo systemctl enable elasticsearch.service
sudo systemctl start elasticsearch.service
(Please wait a minute or two after running the last command to give Elasticsearch time to fully start up.)
6

Verify the Installation

To make sure everything is working perfectly, test the connection. Because version 8 has security turned on by default, you need to use the security certificate and the username elastic:
Bash 
curl --cacert /etc/elasticsearch/certs/http_ca.crt -u elastic https://localhost:9200
When it asks for a password, paste the one you saved in Step 4. If you see a code block on your screen with the phrase "You Know, for Search" , your installation was a complete success!

Final Thoughts

By completing this guide, you have successfully transformed your server into a highly capable data search and analytics engine.
Here is exactly what you have accomplished and installed:

  • Secured the connection: You imported the Elastic PGP key and installed APT transport tools for safe, verified downloads.
  • Added the repository: You linked your system directly to the official Elastic 8.x software source.
  • Installed the core engine: You downloaded and installed the Elasticsearch application onto your machine.
  • Automated the service: You configured systemd to manage Elasticsearch, ensuring it runs smoothly in the background and starts automatically on boot.
  • Authenticated the system: You learned how to securely test your active database using the built-in TLS certificates and the auto-generated superuser password.

You are now completely ready to start indexing your own documents and exploring the incredibly fast search capabilities of Elasticsearch.

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