Install Java with the yum command given below:

$ sudo yum install java-1.8.0-openjdk-devel

$ java -version

Install and Configure Elasticsearch

Command to import the public GPG key of Elasticsearch to the rpm package manager

$ sudo rpm --import http://packages.elastic.co/GPG-KEY-elasticsearch

Create a file elasticsearch.repo in the /etc/yum.repos.d/ directory
Use any editor to create an elasticsearch.repo files than save and exit the file. 

$ sudo vi /etc/yum.repos.d/elasticsearch.repo

Create a file elasticsearch.repo in the /etc/yum.repos.d/ directory
Use any editor to create an elasticsearch.repo file. 

$ sudo vi /etc/yum.repos.d/elasticsearch.repo

Add the following lines to the file :

$   [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

Your repository is ready to use, now install Elasticsearch Package with the command: 

$ sudo yum install elasticsearch

Elasticsearch is Installed now, open configuration directory, and edit the elasticsearch.yml file. elasticsearch.yml file contains various configuration settings.

$ sudo vi /etc/elasticsearch/elasticsearch.yml

In the elasticsearch.yml file find the line that specifies a network and uncomment it and replace its value with “localhost” and http port value with 9200.

Note: 9200 is the default port of the elasticsearch.

network.host: localhost
http.port: 9200

Start the Elasticsearch service with the systemctl command:

Run the enable elasticsearch command to enable Elasticsearch to start up every time your server boots:

$ sudo systemctl enable elasticsearch

Check the status of Elasticsearch and make sure it is Running.

You can test  your Elasticsearch service is running by sending an HTTP request:

$ curl -X GET "localhost:9200"

Installing and Configuring the Kibana Dashboard 

According to the installation of ELK stack order in the official documentation, you should install Kibana after the setup of the Elasticsearch. After setting Kibana, we will be able to use its GUI to search for data and visualize the data that Elasticsearch stores. Because you already added the Elastic repository in the previous step, you can install the remaining components of the Elastic Stack using yum:

$ sudo yum install kibana

Enable and start the Kibana service:

$ sudo systemctl enable kibana
$ sudo systemctl start kibana

Open the kibana.yml file and edit it. Uncomment the lines for server.port, server.host and elasticsearch.host. Then Save and exit the file.

$ sudo vi /etc/kibana/kibana.yml

Note: Uncomment and edit server.host and change it value to “0.0.0.0 ” means allow all traffic to access kibana.

server.port: 5601
server.host: 0.0.0.0
elasticsearch.hosts: "http://localhost:9200"

Restart kibana services.

$  sudo systemctl restart kibana

Kibana is now accessible with the public IP address of your CentOS7 server. You can check the Kibana server’s status  by opening your browser and navigate  to the following address:

http://your_server_ip:5601

Note: 5601 is the default port of Kibana.   

Installing Logstash

Logstash is used to process the data first. Logstash is a tool which can collect and parse data or logs for analyzing it. This will  collect data from different sources, transform it into a standard format, and export it to another database.

$ sudo yum install logstash

Enable the logstash and start the service of logstash and check the status of logstash.

$ sudo systemctl start logstash
$ sudo systemctl enable logstash
$ sudo systemctl status logstash