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Install Elastic Search

First, make sure that all of the latest patches are installed.

sudo apt-get update
sudo apt-get dist-upgrade
sudo reboot

Configure Firewall:

sudo ufw allow ssh
sudo ufw allow 9200/tcp
sudo ufw allow 9300/tcp
sudo ufw enable

Install Install Java

Add the Elastic Search Key and Software:

wget -qO - https://artifacts.elastic.co/GPG-KEY-elasticsearch | sudo apt-key add -
 
cat > /tmp/elastic.list << EOF
deb https://artifacts.elastic.co/packages/5.x/apt stable main
EOF
 
sudo mv /tmp/elastic.list /etc/apt/sources.list.d/
 
sudo apt-get update
 
sudo apt-get install elasticsearch

Configure the ElasticSearch configuration:

sudo sed -i 's/#cluster.name: my-application/cluster.name: escluster-1/g'  /etc/elasticsearch/elasticsearch.yml
sudo sed -i 's/#node.name: node-1/node.name: es-1/g'  /etc/elasticsearch/elasticsearch.yml
sudo sed -i 's/#network.host: 192.168.0.1/network.host: [_eth0_, _local_]/g'  /etc/elasticsearch/elasticsearch.yml

Start ElasticSearch Server, configure it to automatically start and validate the service is running:

sudo service elasticsearch start
 
sudo systemctl daemon-reload
sudo systemctl enable elasticsearch
 
curl http://localhost:9200

Elasticsearch Data Role

If you are creating an Elasticsearch cluster using client, master, and data roles or a single Elasticsearch server which includes all of these roles, you should execute the below on servers that have the data role as ElasticSearch uses a lot of memory-mapped files for indexing so we need to increase the limits allowed by the OS and the JVM:

head -n -1 /etc/security/limits.conf > /tmp/limits.conf
 
cat >> /tmp/limits.conf << EOF
*       soft    nofile  64000
*       hard    nofile  64000
root    soft    nofile  64000
root    hard    nofile  64000
 
# End of file
EOF
 
sudo cp /tmp/limits.conf /etc/security/limits.conf
 
cat /etc/pam.d/common-session > /tmp/common-session
 
cat >> /tmp/common-session << EOF
session     required        pam_limits.so
EOF
 
sudo cp /tmp/common-session /etc/pam.d/common-session
 
cat /etc/pam.d/common-session-interactive > /tmp/common-session-interactive
 
cat >> /tmp/common-session-interactive << EOF
session     required        pam_limits.so
EOF
 
sudo cp /tmp/common-session-interactive /etc/pam.d/common-session-interactive
 
# Give Elasticsearch half of the memory of the server
awk '{ printf "%.2f", $2/1024/1024 ; exit}' /proc/meminfo
sudo sed -i "s/-Xms2g/-Xms`awk '( $1 == "MemTotal:" ) { printf "%.0f", ($2/1024/1024)/2 ; exit }' /proc/meminfo`g/g"  /etc/elasticsearch/jvm.options
sudo sed -i "s/-Xmx2g/-Xmx`awk '( $1 == "MemTotal:" ) { printf "%.0f", ($2/1024/1024)/2 ; exit }' /proc/meminfo`g/g"  /etc/elasticsearch/jvm.options
 
sudo swapoff -a
 
cat > /tmp/elasticsearch.conf << EOF
[Service]
LimitMEMLOCK=infinity
EOF
 
sudo mkdir /etc/systemd/system/elasticsearch.service.d
sudo cp /tmp/elasticsearch.conf /etc/systemd/system/elasticsearch.service.d/elasticsearch.conf
 
reboot
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