How to Install Elasticsearch 8 on Ubuntu 20.04 LTS

In this article we are going to cover How to Install Elasticsearch 8 on Ubuntu 20.04 LTS,Configure Elasticsearch on Ubuntu 20.04 LTS and Uninstall Elasticsearch from Ubuntu.

Introduction

Elasticsearch provides near real-time search and analytics for all types of data. Whether you have structured or unstructured text, numerical data, or geospatial data, Elasticsearch can efficiently store and index it in a way that supports fast searches.

Prerequisites

• Ubuntu Server with 20.04/18.04/16.04 LTS
• Java 8 or higher version
• 2 CPU and 4 GB RAM
• Open Ports 9200

Update the system packages

sudo apt update

Install the apt-transport-https package to access repository over HTTPS

 sudo apt install apt-transport-https

#1.Install OpenJDK on Ubuntu

Lets install OpenJDK 11 on ubuntu  using below commands.

sudo apt install openjdk-11-jdk

Lets verify java version

java --version

Output:

openjdk 11.0.14.1 2022-02-08
OpenJDK Runtime Environment (build 11.0.14.1+1-Ubuntu-0ubuntu1.20.04)
OpenJDK 64-Bit Server VM (build 11.0.14.1+1-Ubuntu-0ubuntu1.20.04, mixed mode, sharing)

#2.Setting the JAVA_HOME Environment Variables

To define the environment variable open the below file:

sudo nano /etc/environment

Paste the below variable into the file:

JAVA_HOME="/usr/lib/jvm/java-11-openjdk-amd64"

Load the environment variable using below command

source /etc/environment

Lets verify JAVA_HOME variable

echo $JAVA_HOME

Output:

/usr/lib/jvm/java-11-openjdk-amd64

#3.Install ElasticSearch 8 on Ubuntu 20.04 LTS

Download and install the public signing key, If you want download latest Elasticsearch then visit Elastic Stack Official download page.

wget -qO - https://artifacts.elastic.co/GPG-KEY-elasticsearch | sudo gpg --dearmor -o /usr/share/keyrings/elasticsearch-keyring.gpg

Save the repository definition to /etc/apt/sources.list.d/elastic-8.x.list:

echo "deb [signed-by=/usr/share/keyrings/elasticsearch-keyring.gpg] https://artifacts.elastic.co/packages/8.x/apt stable main" | sudo tee /etc/apt/sources.list.d/elastic-8.x.list

You can install the Elasticsearch using below command:

sudo apt-get update

sudo apt-get install elasticsearch

Start elacticsearch services

sudo systemctl start elasticsearch

Enable elacticsearch at system startup

sudo systemctl enable elasticsearch

To check the status of elasticsearch

sudo systemctl status elasticsearch

Output:

● elasticsearch.service - Elasticsearch
     Loaded: loaded (/lib/systemd/system/elasticsearch.service; enabled; vendor preset: enabled)
     Active: active (running) since Thu 2022-04-21 06:57:31 UTC; 9s ago
       Docs: https://www.elastic.co
   Main PID: 17266 (java)
      Tasks: 68 (limit: 4693)
     Memory: 2.3G
     CGroup: /system.slice/elasticsearch.service
             ├─17266 /usr/share/elasticsearch/jdk/bin/java -Xshare:auto -Des.networkaddress.cache.ttl=60 -Des.networkaddress.cache.neg>
             └─17539 /usr/share/elasticsearch/modules/x-pack-ml/platform/linux-x86_64/bin/controller

Apr 21 06:57:12 ip-172-31-4-2 systemd[1]: Starting Elasticsearch...
Apr 21 06:57:31 ip-172-31-4-2 systemd[1]: Started Elasticsearch.

#4.Configure Elasticsearch on Ubuntu 20.04 LTS

Let’s make changes in below configuration file

sudo nano /etc/elasticsearch/elasticsearch.yml

Go to Network section and uncomment network.host and replace your system IP with

network.host: 0.0.0.0

And you need to add this line discovery.seed_hosts: [ ] in discovery section as shown in below:

Then second step is go to the BEGIN SECURITY AUTO CONFIGURATION and here you need to replace this true with false as shown in below:

Error: elasticsearch “curl: (52) Empty reply from server” on port 9200

Solution:

Open the Elasticsearch configuration file

sudo nano /etc/elasticsearch/elasticsearch.yml

Change xpack.security.enabled: tru

xpack.security.enabled: false

After changing in configuration file you need to restart so run the below command:

sudo systemctl restart elasticsearch

#5.Access ElasticSearch on Ubuntu

Lets test Elasticsearch using curl command by sending HTTP request

curl -X GET "localhost:9200"

Output:

{
  "name" : "ip-172-31-4-2",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "5WWxXV59TUiwsLWmb1lTDg",
  "version" : {
    "number" : "8.1.3",
    "build_flavor" : "default",
    "build_type" : "deb",
    "build_hash" : "39afaa3c0fe7db4869a161985e240bd7182d7a07",
    "build_date" : "2022-04-19T08:13:25.444693396Z",
    "build_snapshot" : false,
    "lucene_version" : "9.0.0",
    "minimum_wire_compatibility_version" : "7.17.0",
    "minimum_index_compatibility_version" : "7.0.0"
  },
  "tagline" : "You Know, for Search"
}

You can access using browser

http://systemIP:9200

In this article we have covered How to Install Elasticsearch 8 on Ubuntu 20.04 LTS.

#6.Uninstall Elasticsearch on Ubuntu

If you wants to uninstall elasticsearch then you run the below commands:

sudo apt-get --purge autoremove elasticsearch

sudo apt-get remove --purge elasticsearch

sudo rm -rf /etc/elasticsearch

Conclusion:

In this article we have covered How to Install Elasticsearch 8 on Ubuntu 20.04 LTS,Configure Elasticsearch on Ubuntu 20.04 LTS and Uninstall Elasticsearch from Ubuntu.

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