Install and Configure Elasticsearch on Ubuntu 20.04 | 22.04

Steps to Install and Configure Elasticsearch on Ubuntu 20.04 and 22.04

Elasticsearch

What is Elasticsearch?

Elasticsearch is a distributed, open-source search and analytics engine designed to handle large amounts of data. It is based on the Apache Lucene search engine library and provides a RESTful interface for interacting with data. Elasticsearch is known for its scalability, speed, and real-time search capabilities, making it an ideal tool for building complex search and analytics applications.

use cases for Elasticsearch

• Text search: Elasticsearch can be used to search for text within large collections of documents, such as web pages, log files, and social media posts.
• Data analysis: Elasticsearch can be used to analyze and visualize data, providing insights into trends, patterns, and anomalies.
• Logging and monitoring: Elasticsearch is often used to store and search through large volumes of logs and metrics from servers, applications, and other systems.

Install Elasticsearch

Update the package list using the following command:

sudo apt-get update

Install Java:

Elasticsearch requires Java to run. You can install it by running the following command:

sudo apt install default-jdk

Check the Java version using the following command:

java -version

Import the Elasticsearch GPG Key

wget -qO - https://artifacts.elastic.co/GPG-KEY-elasticsearch | sudo gpg --dearmor -o /usr/share/keyrings/elasticsearch-keyring.gpg

Add the Elasticsearch repository to your sources list:

You may need to install the apt-transport-https package before proceeding:

sudo apt-get install apt-transport-https

Add the Elasticsearch repository to your sources list:

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

Install Elasticsearch as a service

Now that all the packages are available, it is time for you to install them.

Update the package list again using the following command:

sudo apt-get update

Install the Elasticsearch package with:

sudo apt-get install elasticsearch

Check Elasticsearch version

You can use the Elasticsearch version command to check the currently installed version.

curl -X GET "http://localhost:9200/"

Elasticsearch Version

Start Elasticsearch using the following command:

sudo systemctl start elasticsearch

Enable the Elasticsearch service to start on boot:

To start it and make sure that the service is always available every time the machine is restarted, type the command:

sudo systemctl enable elasticsearch

Verify your Elasticsearch installation

Check the status of the Elasticsearch service to make sure it is running.
To verify it, run the following command:

sudo systemctl status elasticsearch

Elasticsearch should run automatically, but if this is not the case, make sure to start it.

sudo service elasticsearch start

In the future to stop and restart Elasticsearch, the commands are:

Stop:

sudo service elasticsearch stop

Restart:

sudo service elasticsearch restart

Allow Elasticsearch TCP port 9200 in the Firewall

Elasticsearch's default HTTP port is 9200, you’ll need to allow access to this port on the firewall.

If your firewall is UFW type the following commands:

sudo ufw allow 9200/tcp

configure Elasticsearch

Open up the Elasticsearch configuration file in your “nano” editor:

sudo nano /etc/elasticsearch/elasticsearch.yml

Look for the line that contains the “network host” and uncomment it.
Change the network host value to “127.0.0.1” to listen to the external connections:

network.host: 127.0.0.1

Look for the line that contains the “xpack.security.enabled”.
Change the xpack.security.enabled value to “false”.

xpack.security.enabled: false

The last step is to restart the Elasticsearch service:

sudo service elasticsearch restart

Verify that Elasticsearch is running:

curl -X GET "http://localhost:9200/"

You should see a JSON response with information about your Elasticsearch cluster.

Elasticsearch JSON Response

Conclusion:
In this post, You have now installed and configured Elasticsearch on Ubuntu 20.04 and 22.04.