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ElasticSearch Clustering and Backups

ElasticSearch Installation:


The version we want to install is 2.x (latest sub version of 2).

First we have to install java on centOS machine with following command:

sudo yum install java-1.8.0-openjdk.x86_64

Install Public Signing Key:
 

Create new repo in your /etc/yum.repos.d/ directory. For example I have created elasticsearch.repo here.
/etc/yum.repos.d/elasticsearch.repo
--------------------------------------------------------------------------------------------
[elasticsearch-2.x]
name=Elasticsearch repository for 2.x packages
baseurl=http://packages.elastic.co/elasticsearch/2.x/centos
gpgcheck=1
gpgkey=http://packages.elastic.co/GPG-KEY-elasticsearch
enabled=1
---------------------------------------------------------------------------------------------

Now Elasticsearch 2.x will avilable for installation using yum
 
yum install elasticsearch

After installation enable the service at startup.

chkconfig --add elasticsearch

Otherwise if your distribution is using systemd:
 
sudo /bin/systemctl daemon-reload
sudo /bin/systemctl enable elasticsearch.service

Starting service of elasticsearch:

systemctl start elasticsearch

Now we have done with Elasticsearch installation. You can check your default Elasticsearch configuration in /etc/elasticsearch/elasticsearch.yml

Summary of important Elasticsearch Configuration that are to be changed/uncommented:
 
cluster.name: TechnTech
node.name: es-node-1
network.host: 10.0.0.10
http.port: 9200
discovery.zen.ping.unicast.hosts: ["127.0.0.1"]

Restart the elasticsearch service

systemctl restart elasticsearch

Verify the installation by visiting URL: 10.0.0.10:9200

Install Head plugin in ElasticSearch:

Go to ES directory

cd /usr/share/

Enter the following command to install the Head plugin on ElasticSearch.

sudo elasticsearch/bin/plugin install mobz/elasticsearch-head

Install kopf plugin on ElasticSearch:

./elasticsearch/bin/plugin install lmenezes/elasticsearch-kopf/2.0
 
kopf can be used for monitoring and backups of elasticsearch.
 
Backup ElasticSearch with kopf

ElasticSearch Clustering:


Edit the elasticsearch.yml file in /etc/elasticsearch/elasticsearch.yml for enabling the cluster in elasticsearch.
 

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