Deploy a Multi-Node Elasticsearch Cluster

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

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       |
+----------+-----------+------------+--------------+----------+
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