How to Install Elasticsearch on AlmaLinux 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@vps ~]# 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)

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@vps ~]# nano /etc/yum.repos.d/elasticsearch.repo
[root@vps ~]# dnf install elasticsearch
Elasticsearch repository for 7.x packages        31 MB/s |  25 MB     00:00
Last metadata expiration check: 0:00:09 ago on Mon 31 May 2021 02:45:32 PM EDT.
Dependencies resolved.
================================================================================
 Package             Architecture Version         Repository               Size
================================================================================
Installing:
 elasticsearch       x86_64       7.13.0-1        elasticsearch-7.x       312 M

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@vps ~]# systemctl status elasticsearch
● elasticsearch.service - Elasticsearch
   Loaded: loaded (/usr/lib/systemd/system/elasticsearch.service; enabled; vend>
   Active: active (running) since Mon 2021-05-31 14:52:08 EDT; 4s ago
     Docs: https://www.elastic.co
 Main PID: 21851 (java)
    Tasks: 65 (limit: 11435)
   Memory: 1.1G
   CGroup: /system.slice/elasticsearch.service
           ├─21851 /usr/share/elasticsearch/jdk/bin/java -Xshare:auto -Des.netw>
           └─22048 /usr/share/elasticsearch/modules/x-pack-ml/platform/linux-x8>

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@vps ~]# curl -X GET "localhost:9200/"
{
  "name" : "node-1",
  "cluster_name" : "Crowncloud-Cluster",
  "cluster_uuid" : "5uoMXvd4SbCe2TETVNymUw",
  "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"
}