Elasticsearch is an open-source, distributed search engine built on top of Apache Lucene. It is used for full-text search, structured search, analytics, and all forms of data exploration. It is a powerful tool for data analysis and can be used to store, search, and analyze large amounts of data quickly and efficiently. In this article, we will discuss how to install Elasticsearch on CentOS 7.
Before we begin, there are a few prerequisites that must be met in order to successfully install Elasticsearch on CentOS 7.
• The system must have at least 2GB of RAM.
• The system must have at least 2GB of disk space.
Step 1: Download and Install Java
The first step in installing Elasticsearch on CentOS 7 is to download and install Java. Java is required in order to run Elasticsearch, so it must be installed before proceeding.
To download and install Java, first update the package manager:
$ sudo yum install java-1.8.0-openjdk
Once Java is installed, you can verify the installation by running the following command:
Step 2: Download and Install Elasticsearch
Now that Java is installed, we can proceed to download and install Elasticsearch.
$ sudo yum install elasticsearch
Once the installation is complete, you can verify the installation by running the following command:
Step 3: Configure Elasticsearch
Now that Elasticsearch is installed, we need to configure it.
$ sudo vi /etc/elasticsearch/elasticsearch.yml
In the configuration file, you can set the following parameters:
• discovery.seed_hosts: The list of other nodes in the cluster.
Once you have configured the parameters, save and close the file.
Step 4: Start and Enable Elasticsearch
Now that Elasticsearch is configured, we need to start and enable it.
$ sudo systemctl start elasticsearch
To enable Elasticsearch to start on boot, run the following command:
Step 5: Test the Installation
Now that Elasticsearch is installed and configured, we can test the installation.
To test the installation, open a web browser and navigate to http://localhost:9200. If the installation was successful, you should see a JSON response with the cluster name and version.
In this article, we discussed how to install Elasticsearch on CentOS 7. We covered the prerequisites, how to download and install Java, how to download and install Elasticsearch, how to configure Elasticsearch, how to start and enable Elasticsearch, and how to test the installation. With this information, you should now be able to install and configure Elasticsearch on CentOS 7.