How to Install Elasticsearch on Rocky Linux 8

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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.

Installing Java

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As Elasticsearch depends on Java and it has to be installed on system by using following command.

dnf install java-11-openjdk-devel

Verify the Java installation by following command.

java -version

Output:

[root@server ~]# java -version
openjdk version "11.0.11" 2021-04-20 LTS
OpenJDK Runtime Environment 18.9 (build 11.0.11+9-LTS)
OpenJDK 64-Bit Server VM 18.9 (build 11.0.11+9-LTS, mixed mode, sharing)
[root@server ~]#

Installing Elasticsearch

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Run the following command to install GPG key for the Elasticsearch rpm packages.

rpm --import https://artifacts.elastic.co/GPG-KEY-elasticsearch

Next, create a yum repository file for the Elasticsearch.

nano /etc/yum.repos.d/elasticsearch.repo

Add the following content.

[elasticsearch-7.x]
name=Elasticsearch repository for 7.x packages
baseurl=https://artifacts.elastic.co/packages/7.x/yum
gpgcheck=1
gpgkey=https://artifacts.elastic.co/GPG-KEY-elasticsearch
enabled=1
autorefresh=1
type=rpm-md

Save and exit,

After the repository is enabled, install the Elasticsearch package by using.

dnf install elasticsearch

Output:

[root@server ~]# dnf install elasticsearch
Elasticsearch repository for 7.x packages                                                                    24 MB/s |  25 MB     00:01
Last metadata expiration check: 0:00:13 ago on Thu 27 May 2021 05:23:44 PM EDT.
Dependencies resolved.
============================================================================================================================================
 Package                            Architecture                Version                        Repository                              Size
============================================================================================================================================
Installing:
 elasticsearch                      x86_64                      7.13.0-1                       elasticsearch-7.x                      312 M

Transaction Summary
============================================================================================================================================
Install  1 Package

Total download size: 312 M
Installed size: 520 M
Is this ok [y/N]: y

Configure Elasticsearch

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After installation is completed, edit Elasticsearch configuration file “/etc/elasticsearch/elasticsearch.yml” and set the network.host to localhost.

vim /etc/elasticsearch/elasticsearch.yml

Add the following content,

     cluster.name: Crowncloud-Cluster
     node.name: node-1
     path.data: /var/lib/elasticsearch
     network.host: 127.0.0.1

Save and exit,

Now enable and start the Elasticsearch service.

systemctl enable elasticsearch

systemctl start elasticsearch

Check the status of the service by using following command.

systemctl status elasticsearch

Output:

[root@server ~]# systemctl status elasticsearch
● elasticsearch.service - Elasticsearch
     Loaded: loaded (/usr/lib/systemd/system/elasticsearch.service; enabled; vendor preset: disabled)
     Active: active (running) since Thu 2021-05-27 17:26:14 EDT; 12min ago
         Docs: https://www.elastic.co
 Main PID: 82908 (java)
        Tasks: 55 (limit: 11394)
     Memory: 1.1G
     CGroup: /system.slice/elasticsearch.service
                     ├─82908 /usr/share/elasticsearch/jdk/bin/java -Xshare:auto -Des.networkaddress.cache.ttl=60 -Des.networkaddress.cache.negative.t>
                     └─83105 /usr/share/elasticsearch/modules/x-pack-ml/platform/linux-x86_64/bin/controller

May 27 17:25:24 server systemd[1]: Starting Elasticsearch...
May 27 17:26:14 server systemd[1]: Started Elasticsearch.

Testing Elasticsearch

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Run the following command to view the Elasticsearch server configuration and version details.

curl -X GET "localhost:9200/"

Output:

[root@server ~]# curl -X GET "localhost:9200/"
{
    "name" : "node-1",
    "cluster_name" : "Crowncloud-cluster",
    "cluster_uuid" : "G0GdHCQnRqe2ABCp9EMD3Q",
    "version" : {
        "number" : "7.13.0",
        "build_flavor" : "default",
        "build_type" : "rpm",
        "build_hash" : "5ca8591c6fcdb1260ce95b08a8e023559635c6f3",
        "build_date" : "2021-05-19T22:22:26.081971330Z",
        "build_snapshot" : false,
        "lucene_version" : "8.8.2",
        "minimum_wire_compatibility_version" : "6.8.0",
        "minimum_index_compatibility_version" : "6.0.0-beta1"
    },
    "tagline" : "You Know, for Search"
}