Install ES cluster

Install ES cluster steps

• Install the Java and make sure the java -version worked well

rpm -ivh jdk-8u77-linux-x64.rpm

• Create the user on the cluster nodes

groupadd elasticsearch  
useradd elasticsearch -g elasticsearch -p passw0rd 
passwd elasticsearch

• Create folder for es log and data folder

mkdir -p /data/lib/elasticsearch/data
mkdir -p /data/log/elasticsearch

• Change the owner for es log and data folder

chown -R elasticsearch:elasticsearch /data/lib
chown -R elasticsearch:elasticsearch /data/log

• Change the system limits

vim /etc/security/limits.conf

• Add following code in the limits.conf

*  soft nofile 65535
*  hard nofile 65535
*  soft nproc  65535
*  hard nproc  65535

NOTE: If you want to set the specific user, you can change the * to the user

• Install the elasticsearch

rpm -ivh elasticsearch-2.3.5.rpm

• Configure the elasticsearch.yml file

vim /etc/elasticsearch/elasticsearch.yml

• Add following configuration in to the elasticsearch.yml

cluster.name: ockb-es-cluster
node.name: es-node-1
http.port: 9225

network.host: [host1, _local_]
discovery.zen.ping.unicast.hosts: ["host1", "host2", "host2"]

path.data: /data/lib/elasticsearch/data
path.logs: /data/log/elasticsearch

NOTE: node.name should be unique for every cluster node

• Configure the /etc/sysconfig/elasticsearch file

vim /etc/sysconfig/elasticsearch

• Add following configuration in to the /etc/sysconfig/elasticsearch

ES_HOME=/usr/share/elasticsearch
CONF_DIR=/etc/elasticsearch
DATA_DIR=/data/lib/elasticsearch/data
LOG_DIR=/data/log/elasticsearch
PID_DIR=/var/run/elasticsearch
ES_USER=elasticsearch
ES_GROUP=elasticsearch

• Start the elasticsearch cluster

service elasticsearch start

• Check the elasticsearch worked well

curl -XGET 'http://localhost:9225/_cat/health?pretty'

• The default replicas is 1, if you want to change the replicas number you can chagne it through REST API

curl -XPUT 'http://localhost:9225/_settings?pretty' -d '{ "number_of_replicas" : node number - 1 }'

Install elasticsearch plugins

• Here use head plugin as an example

I used elasticsearch 2.3.5 so use following command to install the plugin

/usr/share/elasticsearch/bin install mobz/elasticsearch-head

• After installed successfully

• Restart the elasticsearch

• The access the URL: http://<elasticsearch server>:9225/_plugin/head/