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How to install Elasticsearch 6 on CentOS

In this tutorial, we will explain how to install Elasticsearch 6 on CentOS.

Elasticsearch is a search engine based on the Lucene library. It provides a distributed, multi-tenant-capable full-text search engine with an HTTP web interface and schema-free JSON documents. Elasticsearch is developed in Java. Until more recent versions, following an open-core business model, parts of the software are licensed under various open source licenses (mostly the Apache License), while other parts fall under the commercial (source-available) Elastic License.

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This tutorial is now older than 2 years and may contain outdated information. There might be inaccuracies due to major changes in the software described. You should rather consider this tutorial as a general guideline that may or may not work in your specific situation.

Prerequisites​

In order to follow along this tutorial, you'll need

  • A VPS running CentOS with sufficient memory and CPU resources (e.g. a VPS Premium)

Step 1 – Install OpenJDK​

As Elasticsearch is written in Java, we need to install a Java Runtime Environment (JRE), first. For Elasticsearch 6, we'll use OpenJDK 8. If you are connected to your server using a non-root user, you'll need to prefix the following commands with sudo to run them with elevated privileges. You can install it by running the following command:

sudo yum install java-1.8.0-openjdk.x86_64

Step 2 – Download Elasticsearch 6 RPM file​

Now, you can download the Elasticsearch 6 RPM file by running this command:

wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.7.0.rpm

Step 3 – Install Elasticsearch 6​

Now it's time to install Elasticsearch 6. Install it by running the rpm package manager on the downloaded file:

sudo rpm -ivh elasticsearch-6.7.0.rpm

After the installation of Elasticsearch 6 it will not be automatically started or enabled for auto-start when your server stats. To enable Elasticsearch 6 for auto-start run:

sudo systemctl enable elasticsearch.service

Afterward, proceed to start it:

systemctl start elasticsearch.service

Step 4 – Verify installation​

Now you can test your Elasticsearch 6 installation by running this command:

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

If you get a response that looks like this, your installation was successful.

Elasticsearch 6 response

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Please notice that this only describes the basic installation process. You should always consider securing your Elasticsearch installation by following the official Elasticsearch security documentation.