Practitioner Level

Deploy a Multi-Node Elasticsearch Cluster

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2 hours
  • 4 Learning Objectives

About this Hands-on Lab

Before we can get hands-on with indexing, searching, and aggregating our data with Elasticsearch, we first need to know how to prepare a system and how to deploy and configure Elasticsearch. In this hands-on lab, you will deploy a 3-node Elasticsearch cluster with a specific set of configuration requirements. Specifically, you will:

* Deploy Elasticsearch from an RPM
* Specify Elasticsearch cluster and node names
* Create custom attributes for Elasticsearch nodes
* Assign Elasticsearch node roles
* Configure the Elasticsearch Java virtual machine (JVM) heap
* Bind Elasticsearch to specific network addresses
* Configure Elasticsearch node discovery
* Configure Elasticsearch cluster bootstrap
* Start Elasticsearch
* Inspect Elasticsearch cluster logs
* `curl` the Elasticsearch node APIs to check status and configuration

Learning Objectives

Successfully complete this lab by achieving the following learning objectives:

Install Elasticsearch on each node.

Using the Secure Shell (SSH), log in to each node as cloud_user via the public IP address.

Become the root user with:

sudo su -

Import the Elastic GPG key:

rpm --import https://artifacts.elastic.co/GPG-KEY-elasticsearch

Download the Elasticsearch 7.6 RPM:

curl -O https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.6.0-x86_64.rpm

Install Elasticsearch:

rpm --install elasticsearch-7.6.0-x86_64.rpm

Configure Elasticsearch to start on system boot:

systemctl enable elasticsearch
Configure each node’s elasticsearch.yml per instructions.

Log in to each node and become the root user:

sudo su -

Open the elasticsearch.yml file:

vim /etc/elasticsearch/elasticsearch.yml

Change the following line:

#cluster.name: my-application

to

cluster.name: cluster-1

Change the following line on master-1:

#node.name: node-1

to

node.name: master-1

Change the following line on data-1:

#node.name: node-1

to

node.name: data-1

Change the following line on data-2:

#node.name: node-1

to

node.name: data-2

Change the following line on data-1:

#node.attr.rack: r1

to

node.attr.temp: hot

Change the following line on data-2:

#node.attr.rack: r1

to

node.attr.temp: warm

Add the following lines on master-1:

node.master: true
node.data: false
node.ingest: false
node.ml: false

Add the following lines on data-1:

node.master: false
node.data: true
node.ingest: true
node.ml: false

Add the following lines on data-2:

node.master: false
node.data: true
node.ingest: true
node.ml: false

Change the following on each node:

#network.host: 192.168.0.1

to

network.host: [_local_, _site_]

Change the following on each node:

#discovery.seed_hosts: ["host1", "host2"]

to

discovery.seed_hosts: ["10.0.1.101"]

Change the following on each node:

#cluster.initial_master_nodes: ["node-1", "node-2"]

to

cluster.initial_master_nodes: ["master-1"]
Configure the heap for each node per instructions.

Log in to the master node and become the root user:

sudo su -

Open the jvm.options file:

vim /etc/elasticsearch/jvm.options

Change the following lines:

-Xms1g
-Xmx1g

to

-Xms768m
-Xmx768m

Log in to each data node and become the root user:

sudo su -

Open the jvm.options file:

vim /etc/elasticsearch/jvm.options

Change the following lines:

-Xms1g
-Xmx1g

to

-Xms2g
-Xmx2g
Start Elasticsearch on each node.

Log in to each node and become the root user:

sudo su -

Start Elasticsearch:

systemctl start elasticsearch

Check the startup process:

less /var/log/elasticsearch/cluster-1.log

Check the node configuration:

curl localhost:9200/_cat/nodes?v
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Additional Resources

You are a system administrator who has been asked to deploy a 3-node Elasticsearch cluster with very specific configuration requirements:

  • You will need to install Elasticsearch version 7.6.0 from an RPM at https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.6.0-x86_64.rpm.
  • Each Elasticsearch instance will need to listen on both the local and site-local addresses.
  • Configure each node of the cluster-1 cluster as outlined in the table below.
+----------+-----------+------------+--------------+----------+
| Server   | Node Name | Attributes | Roles        | JVM Heap |
+----------+-----------+------------+--------------+----------+
| master-1 | master-1  |            | master       | 768m     |
+----------+-----------+------------+--------------+----------+
| data-1   | data-1    | temp=hot   | data, ingest | 2g       |
+----------+-----------+------------+--------------+----------+
| data-2   | data-2    | temp=warm  | data, ingest | 2g       |
+----------+-----------+------------+--------------+----------+

What are Hands-on Labs

Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.

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