Install Elasticsearch 5.x on Ubuntu 16.04

Requirements

Elasticsearch 5.x requires Java 8 or later. If you don't have Java installed yet - follow this guide.

The Elasticsearch APT repository is using HTTPS. For this reason, you need to install the following package.

apt-get install apt-transport-https

Install Elasticsearch

Add official the APT repository to your sources.list

echo "deb https://artifacts.elastic.co/packages/5.x/apt stable main" > /etc/apt/sources.list.d/elastic-5.x.list
wget -qO - https://artifacts.elastic.co/GPG-KEY-elasticsearch | apt-key add -
apt-get update

Install

apt-get install elasticsearch

Configure Elasticsearch

In this case, we are going to setup a standalone Elasticsearch system.

Open the file /etc/elasticsearch/elasticsearch.yml to adjust the following values

#Set the name of your Elasticsearch Cluster
cluster.name: statusengine

# Set the name of the current node
node.name: elastic01

#Path where Elasticsearch should store data
path.data: /var/lib/elasticsearch

#Path where Elasticsearch should store log files
path.logs: /var/log/elasticsearch

#You need at least one master node inside
#of your Elasticsearch Cluster
node.master: true

#You need at least one node inside
#of your Elasticsearch Cluster, that holds your data
node.data: true

If one of the listed options is missing in your default config, just add it .

Start Elasticsearch

systemctl enable elasticsearch.service
systemctl start elasticsearch.service

By default Elasticsearch will listen on localhost:9200 and localhost:9300.

You can change this or run an HTTP reverse proxy (for example nginx) in front of Elasticsearch.

root@ubuntu:~# netstat -tulpen | grep java
tcp6       0      0 127.0.0.1:9200          :::*                    LISTEN      111        32142       9731/java
tcp6       0      0 ::1:9200                :::*                    LISTEN      111        32141       9731/java
tcp6       0      0 127.0.0.1:9300          :::*                    LISTEN      111        32100       9731/java
tcp6       0      0 ::1:9300                :::*                    LISTEN      111        32091       9731/java

Test Elasticsearch

To check if your installation of Elasticsearch is running, you can run a simple status query against it.

curl -X GET "http://localhost:9200"

You should get an result like this:

{
  "name" : "elastic01",
  "cluster_name" : "statusengine",
  "cluster_uuid" : "Iz8f3T6pQQ62k_asARql-w",
  "version" : {
    "number" : "5.6.3",
    "build_hash" : "1a2f265",
    "build_date" : "2017-10-06T20:33:39.012Z",
    "build_snapshot" : false,
    "lucene_version" : "6.6.1"
  },
  "tagline" : "You Know, for Search"
}

Setup Cerebro

Cerebro (previously known as kopf), is an web based admin tool for Elasticsearch. Especially if you are new to Elasticsearch it will help you a lot!

Before you start! Please check for newer version at the official GitHub repository!

cd /tmp
wget https://github.com/lmenezes/cerebro/releases/download/v0.7.1/cerebro-0.7.1.tgz
tar xfv cerebro-0.7.1.tgz
cd cerebro-0.7.1/
mkdir -p /usr/local/share/cerebro
cp -r * /usr/local/share/cerebro/

Now you can run Cerebro using this command:

/usr/local/share/cerebro/bin/cerebro

You should now be able to access Cerebro via your Webbrowser: http://<ip-address>:9000

In addition, you can add a systemd service, to run Cerebro as service in the background. Create the file /lib/systemd/system/cerebro.service:

[Unit]
Description=Cerebro
After=syslog.target network.target

[Service]
User=root
Type=simple
Restart=on-failure
ExecStart=/usr/local/share/cerebro/bin/cerebro

[Install]
WantedBy=multi-user.target

systemctl daemon-reload
systemctl start cerebro.service