Elasticsearch is

Step 1: Install and verify Java
You can install the latest OpenJDK with below command:
[root@elastic-search ~]# yum install java-1.8.0-openjdk.x86_64
Verify Java:
[root@elastic-search ~]# java -version
openjdk version "1.8.0_191"
OpenJDK Runtime Environment (build 1.8.0_191-b12)
OpenJDK 64-Bit Server VM (build 25.191-b12, mixed mode)
Step 2: Downloading and Installing Elasticsearch
Download the rpm from the official Elasticsearch website from CentOs or RHEL
[root@elastic-search opt]# wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.3.0.rpm
--2019-02-07 07:44:09-- https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.3.0.rpm
Resolving artifacts.elastic.co (artifacts.elastic.co)... 151.101.2.222, 151.101.66.222, 151.101.130.222, ...
Connecting to artifacts.elastic.co (artifacts.elastic.co)|151.101.2.222|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 91384332 (87M) [application/octet-stream]
Saving to: ‘elasticsearch-6.3.0.rpm’
100%[====================================================================================================>] 91,384,332 70.6MB/s in 1.2s
2019-02-07 07:44:12 (70.6 MB/s) - ‘elasticsearch-6.3.0.rpm’ saved [91384332/91384332]
Install the elasticsearch rpm like below:
[root@elastic-search opt]# yum localinstall elasticsearch-6.3.0.rpm
Loaded plugins: fastestmirror
Examining elasticsearch-6.3.0.rpm: elasticsearch-6.3.0-1.noarch
Marking elasticsearch-6.3.0.rpm to be installed
Resolving Dependencies
--> Running transaction check
---> Package elasticsearch.noarch 0:6.3.0-1 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
==============================================================================================================================================
Package Arch Version Repository Size
==============================================================================================================================================
Installing:
elasticsearch noarch 6.3.0-1 /elasticsearch-6.3.0 136 M
Transaction Summary
==============================================================================================================================================
Install 1 Package
Total size: 136 M
Installed size: 136 M
Is this ok [y/d/N]: y
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Creating elasticsearch group... OK
Creating elasticsearch user... OK
Installing : elasticsearch-6.3.0-1.noarch 1/1
### NOT starting on installation, please execute the following statements to configure elasticsearch service to start automatically using systemd
sudo systemctl daemon-reload
sudo systemctl enable elasticsearch.service
### You can start elasticsearch service by executing
sudo systemctl start elasticsearch.service
Created elasticsearch keystore in /etc/elasticsearch
Verifying : elasticsearch-6.3.0-1.noarch 1/1
Installed:
elasticsearch.noarch 0:6.3.0-1
Complete!
Enable elasticsearch service on startup so it will start automatically on the desired run level.
[root@elastic-search opt]# sudo systemctl daemon-reload
[root@elastic-search opt]# sudo systemctl enable elasticsearch.service
Created symlink from /etc/systemd/system/multi-user.target.wants/elasticsearch.service to /usr/lib/systemd/system/elasticsearch.service.
Step 3: Configuring Elasticsearch
elasticsearch.yml : Elasticsearch server settings. This is where all options, except those for logging, are stored, which is why we are mostly interested in this file.
logging.yml: Provides configuration for logging. In the beginning, you don’t have to edit this file. You can leave all default logging options. You can find the resulting logs in /var/log/elasticsearch by default.
Edit /etc/elasticsearch/elasticsearch.yml to configure Elasticsearch settings
# Use a descriptive name for the node:
node.name: node-1
# Use a descriptive name for your cluster:
cluster.name: elastic-cluster
Use network.host for configuring your server IP bind address
# Set the bind address to a specific IP (IPv4 or IPv6):
network.host: 10.142.0.17
Start Elasticsearch cluster through systemctl
[root@elastic-search opt]# systemctl start elasticsearch
Step 4: Test Elasticsearch cluster
Elasticsearch will be run on port 9200. We can test it with curl, with simple GET request
[root@elastic-search opt]# curl -X GET http://10.142.0.17:9200
{
"name" : "node-1",
"cluster_name" : "elastic-cluster",
"cluster_uuid" : "_na_",
"version" : {
"number" : "6.3.0",
"build_flavor" : "default",
"build_type" : "rpm",
"build_hash" : "424e937",
"build_date" : "2018-06-11T23:38:03.357887Z",
"build_snapshot" : false,
"lucene_version" : "7.3.1",
"minimum_wire_compatibility_version" : "5.6.0",
"minimum_index_compatibility_version" : "5.0.0"
},
"tagline" : "You Know, for Search"
}
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