How to Install Elasticsearch on Fedora & CentOS

Elasticsearch is flexible and powerful open source, distributed real-time search and analytics engine. Using a simple set of APIs, it provides the ability for full-text search. Elastic search is freely available under the Apache 2 license, which provides the most flexibility.

This tutorial will help you to setup Elasticsearch single node cluster on CentOS, Red Hat, and Fedora systems.

Step 1 – Prerequsities

Java is the primary requirement for installing Elasticsearch on any system. You can check the installed version of Java by executing the following command. If it returns an error, install Java on your system using this tutorial.

java -version

Step 2 – Download Elasticsearch

Now download the latest Elasticsearch archive from its official download page. At the time of last update of this article Elasticsearch 7.1.1 version is latest version available to download. After download extract the archive.

wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.1.1-linux-x86_64.tar.gz
tar xzf elasticsearch-7.1.1-linux-x86_64.tar.gz

Step 3 – Configure Elasticsearch

Now we need to set up the Elasticsearch cluster and node name. Elasticsearch uses “elasticsearch” as default cluster name, We recommend to change it as per your setup.

mv elasticsearch-7.1.1 /usr/share/elasticsearch
cd /usr/share/elasticsearch

To change cluster named edit config/elasticsearch.yml file and update following values. Node names are dynamically generated, but to keep a fixed user-friendly name change it also. You may also need to change network host to access elasticsearch from remote hosts.

 vim config/elasticsearch.yml

  network.host: 192.168.10.100
  cluster.name: TecAdmin_Cluster1
  node.name: "California Datacenter"

Step 4 – Start Elasticsearch and Test

As the Elasticsearch setup is completed. Let the start Elasticsearch cluster using following command.

./bin/elasticsearch &

You have all done, just need to verify setup. Elasticsearch works on port default port 9200, open your browser to point your server on port 9200, You will find something like below output

 
http://localhost:9200/

Step 5 – Elasticsearch Uses Examples

Following examples will help you to add, fetch and search data in Elasticsearch cluster.

Create New Bucket

curl -XPUT http://localhost:9200/mybucket

Output:

{"acknowledged":true}

Adding Data to Elasticsearch

Use following commands to add some data in Elasticsearch.
Command 1:

curl -XPUT 'http://localhost:9200/mybucket/user/johny' -d '{ "name" : "Rahul Kumar" }'

Output:

{"_index":"mybucket","_type":"user","_id":"johny","_version":1,"created":true}

Command 2:

curl -XPUT 'http://localhost:9200/mybucket/post/1' -d '
{
    "user": "Rahul",
    "postDate": "01-15-2015",
    "body": "This is Demo Post 1 in Elasticsearch" ,
    "title": "Demo Post 1"
}'

Output:

{"_index":"mybucket","_type":"post","_id":"1","_version":1,"created":true}

Command 3:

curl -XPUT 'http://localhost:9200/mybucket/post/2' -d '
{
    "user": "TecAdmin",
    "postDate": "01-15-2015",
    "body": "This is Demo Post 2 in Elasticsearch" ,
    "title": "Demo Post 2"
}'

Output:

{"_index":"mybucket","_type":"post","_id":"2","_version":1,"created":true}

Fetching Data from Elasticsearch

Use the following command to GET data from ElasticSearch and read the output.

curl -XGET 'http://localhost:9200/mybucket/user/johny?pretty=true'
curl -XGET 'http://localhost:9200/mybucket/post/1?pretty=true'
curl -XGET 'http://localhost:9200/mybucket/post/2?pretty=true'

Searching in Elasticsearch

Use the following command to search data from elastic search. Below command will search all data associated with user johny.

curl 'http://localhost:9200/mybucket/post/_search?q=user:TecAdmin&pretty=true'

Output:

{
  "took" : 145,
  "timed_out" : false,
  "_shards" : {
    "total" : 5,
    "successful" : 5,
    "failed" : 0
  },
  "hits" : {
    "total" : 1,
    "max_score" : 0.30685282,
    "hits" : [ {
      "_index" : "mybucket",
      "_type" : "post",
      "_id" : "2",
      "_score" : 0.30685282,
      "_source":
{
    "user": "TecAdmin",
    "postDate": "01-15-2015",
    "body": "This is Demo Post 2 in Elasticsearch" ,
    "title": "Demo Post 2"
}
    } ]
  }
}

Congratulation’s! You have successfully configured elasticsearch single node cluster on your Linux system.