Step-by-Step Guide to Installing and Configuring Elasticsearch 7.6.2 on CentOS 7

Elasticsearch is a Lucene‑based search server that offers a distributed, multi‑user full‑text search engine via a RESTful web interface. Developed in Java and released under the Apache license, it is widely used in cloud computing environments for real‑time, stable, reliable, and fast search capabilities.

1. Install the Java runtime (JDK 1.8) on the CentOS 7 host:

yum install java-1.8.0 -y

2. Download and install Elasticsearch 7.6.2 using the RPM package:

3. Edit the elasticsearch.yml configuration file (usually located at /etc/elasticsearch/elasticsearch.yml) with the following settings:

path.data: /var/lib/elasticsearch

path.logs: /var/log/elasticsearch

network.host: 0.0.0.0

http.port: 9200

xpack.security.enabled: true

discovery.type: single-node

4. Start the Elasticsearch service:

systemctl start elasticsearch

5. Set passwords for the built‑in users (elastic, apm_system, kibana, etc.) using the interactive setup tool:

/usr/share/elasticsearch/bin/elasticsearch-setup-passwords interactive

The tool prompts for passwords for each user and confirms the changes, e.g.,

Enter password for [elastic]:

Reenter password for [elastic]:

After confirming, passwords for all reserved users are updated.

6. Verify that Elasticsearch is running and secured by issuing a curl request with the newly set credentials: curl -u elastic:hahashen http://192.168.20.41:9200 The response returns cluster information in JSON format, confirming the version (7.6.2) and other details.

7. The single‑node Elasticsearch deployment is now complete; users can scan the QR code below to follow the project for further learning.