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A Cloud Guru

Deploy and Configure a Multi-Node Elasticsearch Cluster

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 6-node Elasticsearch cluster with a specific set of configuration requirements. Specifically, you will: * Create an `elastic` user * Configure the open limit * Set memory map limits via sysctl * Deploy Elasticsearch from an archive * 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 as a daemon * `curl` the Elasticsearch nodes to check status and configuration

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Path Info

Level

Advanced

Duration

3h 0m

Published

Jan 10, 2020

Challenge

Prepare each node, create the elastic user, and deploy Elasticsearch.
Create the elastic user:
```
sudo useradd elastic
```
Open the limits.conf file as root:
```
sudo vim /etc/security/limits.conf
```
Add the following line near the bottom:
```
elastic - nofile 65536
```
Open the sysctl.conf file as root:
```
sudo vim /etc/sysctl.conf
```
Add the following line at the bottom:
```
vm.max_map_count=262144
```
Load the new sysctl values:
```
sudo sysctl -p
```
Become the elastic user:
```
sudo su - elastic
```
Download the binaries for Elasticsearch 7.2.1 in the elastic user's home directory:
```
curl -O https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.2.1-linux-x86_64.tar.gz
```
Unpack the archive:
```
tar -xzvf elasticsearch-7.2.1-linux-x86_64.tar.gz
```
Remove the archive:
```
rm elasticsearch-7.2.1-linux-x86_64.tar.gz
```
Rename the unpacked directory:
```
mv elasticsearch-7.2.1 elasticsearch
```

Challenge

Configure each node's elasticsearch.yml per instructions.

sudo su - elastic

Open the elasticsearch.yml file:

vim /home/elastic/elasticsearch/config/elasticsearch.yml

Change the following line:

#cluster.name: my-application

cluster.name: linux_academy

Change the following line on master-1:

#node.name: node-1

node.name: master-1

Change the following line on master-2:

#node.name: node-1

node.name: master-2

Change the following line on master-3:

#node.name: node-1

node.name: master-3

Change the following line on data-1:

#node.name: node-1

node.name: data-1

Change the following line on data-2:

#node.name: node-1

node.name: data-2

Change the following line on data-3:

#node.name: node-1

node.name: data-3

Change the following line on master-1:

#node.attr.rack: r1

node.attr.zone: 1

Change the following line on master-2:

#node.attr.rack: r1

node.attr.zone: 2

Change the following line on master-3:

#node.attr.rack: r1

node.attr.zone: 3

Change the following line on data-1:

#node.attr.rack: r1

node.attr.zone: 1

Add the following line on data-1:

node.attr.temp: hot

Change the following line on data-2:

#node.attr.rack: r1

node.attr.zone: 2

Add the following line on data-2:

node.attr.temp: hot

Change the following line on data-3:

#node.attr.rack: r1

node.attr.zone: 3

Add the following line on data-3:

node.attr.temp: warm

Add the following lines on master-1:

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

Add the following lines on master-2:

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

Add the following lines on master-3:

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

Add the following lines on data-1:

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

Add the following lines on data-2:

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

Add the following lines on data-3:

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

Change the following on each node:

#network.host: 192.168.0.1

network.host: [_local_, _site_]

Change the following on each node:

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

discovery.seed_hosts: ["10.0.1.101", "10.0.1.102", "10.0.1.103"]

Change the following on each node:

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

cluster.initial_master_nodes: ["master-1", "master-2", "master-3"]

Challenge

Configure the heap for each node per instructions.
Log in to each master node and become the elastic user:
```
sudo su - elastic
```
Open the jvm.options file:
```
vim /home/elastic/elasticsearch/config/jvm.options
```
Change the following lines:
```
-Xms1g
-Xmx1g
```
to
```
-Xms768m
-Xmx768m
```
Log in to each data node and become the elastic user:
```
sudo su - elastic
```
Open the jvm.options file:
```
vim /home/elastic/elasticsearch/config/jvm.options
```
Change the following lines:
```
-Xms1g
-Xmx1g
```
to
```
-Xms2g
-Xmx2g
```
Challenge

Start Elasticsearch as a daemon on each node.
Log in to each node and become the elastic user:
```
sudo su - elastic
```
Switch to the elasticsearch directory:
```
cd /home/elastic/elasticsearch
```
Start Elasticsearch as a daemon:
```
./bin/elasticsearch -d -p pid
```
Check the startup process:
```
less /home/elastic/elasticsearch/logs/linux_academy.log
```
Check the node configuration:
```
curl localhost:9200/_cat/nodes?v
```

Author

A Cloud Guru

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

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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.