Installing Elasticsearch on CentOS 8

Elasticsearch is a highly scalable open-source search and analytics engine that allows you to store, search, and analyze large amounts of data in near real-time. It is capable of handling diverse types of data and provides powerful full-text search capabilities.

Here is a step-by-step guide to installing Elasticsearch on CentOS 8:

1. Start by updating your system's package index:
   sudo dnf update
2. Install the Java Development Kit (JDK) if you don't have it already. Elasticsearch requires at least JDK 11. Run the following command to install OpenJDK 11:
   sudo dnf install java-11-openjdk-devel
3. Add the Elasticsearch repository to your system:
   sudo rpm --import https://artifacts.elastic.co/GPG-KEY-elasticsearch
sudo vi /etc/yum.repos.d/elasticsearch.repo
4. Insert the following content into the file:
   [elasticsearch-7.x]
name=Elasticsearch repository for 7.x packages
baseurl=https://artifacts.elastic.co/packages/oss-7.x/yum
gpgcheck=1
gpgkey=https://artifacts.elastic.co/GPG-KEY-elasticsearch
enabled=1
autorefresh=1
type=rpm-md
5. Save the file and exit the text editor.
6. Install Elasticsearch:
   sudo dnf install elasticsearch-oss
7. Edit the Elasticsearch configuration file:
   sudo vi /etc/elasticsearch/elasticsearch.yml
8. Update the following configurations inside the file as per your requirements:
   • network.host: Set it to localhost if you want Elasticsearch to only accept connections from the local machine.
   • http.port: Set the port on which Elasticsearch will listen for HTTP traffic.

   Save the file and exit the text editor.

9. Start and enable the Elasticsearch service:
   sudo systemctl start elasticsearch
sudo systemctl enable elasticsearch

At this point, Elasticsearch should be successfully installed on your CentOS 8 system. You can now use its powerful features for searching and analyzing your data.