Elasticsearch is a distributed restful search and analytics. In this documentation, I will show how to install Elasticsearch on CentOS 6.

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Install Oracle Java

wget --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/8u31-b13/server-jre-8u31-linux-x64.tar.gz
sudo mkdir /opt/jre
sudo tar zxf server-jre-8u31-linux-x64.tar.gz -C /opt/jre
sudo update-alternatives --install /usr/bin/java java /opt/jre/jdk1.8.0_31/bin/java 2000
sudo update-alternatives --install /usr/bin/javac javac /opt/jre/jdk1.8.0_31/bin/javac 2000
sudo update-alternatives --display java
sudo update-alternatives --display javac

Import Elasticsearch GPG key

sudo rpm --import https://packages.elasticsearch.org/GPG-KEY-elasticsearch

Add Elasticsearch repository

sudo vi /etc/yum.repos.d/elasticsearch.repo

[elasticsearch-1.4]
name=Elasticsearch repository for 1.4.x packages
baseurl=http://packages.elasticsearch.org/elasticsearch/1.4/centos
gpgcheck=1
gpgkey=http://packages.elasticsearch.org/GPG-KEY-elasticsearch
enabled=1

Install Elasticsearch using yum

sudo yum install elasticsearch

Start Elasticsearch service

 sudo service elasticsearch start
 sudo chkconfig elasticsearch on

Reference: https://www.elasticsearch.org/guide/en/elasticsearch/reference/current/setup-repositories.html