How To Install Elasticsearch on RHEL 8 / CentOS 8

How can I install Elasticsearch on RHEL 8 / CentOS 8 Linux system?. This guide will help you to install Elasticsearch on RHEL 8 / CentOS 8 Linux system. Elasticsearch is an Open source full-text search and analytics engine tool used to store, search, and analyze big volumes of data in near real time.

For multi-node cluster, refer to Setup Elasticsearch Cluster on CentOS | Ubuntu With Ansible

Step 1: Install Java on RHEL 8 / CentOS 8

As Elasticsearch depends on Java, you need it installed on your system prior to installing Elasticsearch 6 or 5 on RHEL 8.

• How to Install Java 11 (OpenJDK 11) on RHEL 8

Confirm Java works by checking the version.

$ java -version
openjdk version "11.0.14" 2022-01-18 LTS
OpenJDK Runtime Environment 18.9 (build 11.0.14+9-LTS)
OpenJDK 64-Bit Server VM 18.9 (build 11.0.14+9-LTS, mixed mode, sharing)

$ which java
/usr/bin/java

Step 2: Add Elasticsearch YUM Repository

For Elasticsearch 7.x, add:

cat <<EOF | sudo tee /etc/yum.repos.d/elasticsearch.repo
[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
EOF

For Elasticsearch 6.x, add:

cat <<EOF | sudo tee /etc/yum.repos.d/elasticsearch.repo
[elasticsearch-6.x]
name=Elasticsearch repository for 6.x packages
baseurl=https://artifacts.elastic.co/packages/oss-6.x/yum
gpgcheck=1
gpgkey=https://artifacts.elastic.co/GPG-KEY-elasticsearch
enabled=1
autorefresh=1
type=rpm-md
EOF

For Elasticsearch 5.x, add:

cat <<EOF | sudo tee /etc/yum.repos.d/elasticsearch.repo
[elasticsearch-5.x]
name=Elasticsearch repository for 5.x packages
baseurl=https://artifacts.elastic.co/packages/oss-5.x/yum
gpgcheck=1
gpgkey=https://artifacts.elastic.co/GPG-KEY-elasticsearch
enabled=1
autorefresh=1
type=rpm-md
EOF

Once the repository is added, clear and update your YUM package index.

sudo yum clean all
sudo yum makecache

Step 3: Install Elasticsearch on RHEL 8 / CentOS 8

Elasticsearch repository is ready for use on the system. You can install Elasticsearch using the command below:

sudo yum -y install elasticsearch-oss

Confirm package installation.

$ rpm -qi elasticsearch-oss 
Name        : elasticsearch-oss
Epoch       : 0
Version     : 7.10.2
Release     : 1
Architecture: x86_64
Install Date: Tue 18 Oct 2022 07:36:01 PM UTC
Group       : Application/Internet
Size        : 420252496
License     : ASL 2.0
Signature   : RSA/SHA512, Wed 13 Jan 2021 03:45:21 AM UTC, Key ID d27d666cd88e42b4
Source RPM  : elasticsearch-oss-7.10.2-1-src.rpm
Build Date  : Wed 13 Jan 2021 12:54:36 AM UTC
Build Host  : packer-virtualbox-iso-1600176624
Relocations : /usr
Packager    : Elasticsearch
Vendor      : Elasticsearch
URL         : https://www.elastic.co/
....

You can set JVM options like memory limits by editing the file: /etc/elasticsearch/jvm.options

sudo vim /etc/elasticsearch/jvm.options

Example below sets initial/maximum size of total heap space

-Xms1g
-Xmx1g

If your system has less memory, you can configure it to use small megabytes of ram.

-Xms256m
-Xmx512m

Start and enable elasticsearch service on boot:

$ sudo systemctl enable --now elasticsearch.service 
 Synchronizing state of elasticsearch.service with SysV service script with /usr/lib/systemd/systemd-sysv-install.
 Executing: /usr/lib/systemd/systemd-sysv-install enable elasticsearch
 Created symlink /etc/systemd/system/multi-user.target.wants/elasticsearch.service → /usr/lib/systemd/system/elasticsearch.service.

Test to verify that it is working:

$ curl http://127.0.0.1:9200 
{
  "name" : "cent7.mylab.io",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "p2FuivSdRMqobd3zA5RR8Q",
  "version" : {
    "number" : "7.10.2",
    "build_flavor" : "oss",
    "build_type" : "rpm",
    "build_hash" : "747e1cc71def077253878a59143c1f785afa92b9",
    "build_date" : "2021-01-13T00:42:12.435326Z",
    "build_snapshot" : false,
    "lucene_version" : "8.7.0",
    "minimum_wire_compatibility_version" : "6.8.0",
    "minimum_index_compatibility_version" : "6.0.0-beta1"
  },
  "tagline" : "You Know, for Search"
}

Create a test index:

$ curl -X PUT "http://127.0.0.1:9200/mytest_index"
{"acknowledged":true,"shards_acknowledged":true,"index":"mytest_index"}

Step 4: Install Kibana on RHEL / CentOS 8

If you need to install Kibana visualization tool, run the command below in your terminal.

sudo yum -y install kibana-oss

After a successful installation, configure Kibana:

$ sudo vim /etc/kibana/kibana.yml
 server.host: "0.0.0.0"
 server.name: "kibana.example.com"
 elasticsearch.url: "http://localhost:9200"

Change other settings as desired then start kibana service:

sudo systemctl enable --now kibana

Access http://ip-address:5601 to open Kibana Dashboard:

If you have an active firewall, you’ll need to allow access to Kibana port:

sudo firewall-cmd --add-port=5601/tcp --permanent
sudo firewall-cmd --reload

You now have Elasticsearch 7/6/5 on RHEL / CentOS 8.

Elasticsearch Learning Video Courses

• Complete Elasticsearch Masterclass with Logstash and Kibana
• Elasticsearch 7 and the Elastic Stack: In Depth and Hands On
• Complete Guide to Elasticsearch
• Complete Elasticsearch Masterclass with Logstash and Kibana
• Data Processing with Logstash (and Filebeat)

Also read:

How to delete Elasticsearch Index data with curl