Installing Elasticsearch in Ubuntu 22.04

What can Elasticsearch do?

1. Data Storage and Retrieval: Elasticsearch allows you to store and index various types of data, including text, numbers, geospatial data, and custom data types.
2. Full-text Search: Elasticsearch provides full-text search with support for complex queries such as search phrases, wildcard queries, Fuzzy search and more.
3. Distributed architecture: Elasticsearch uses a distributed architecture, which allows you to scale the system and process large amounts of data.
4. API: Elasticsearch offers various APIs for data management and indexing, including REST API and Java API.
5. Data Aggregations: Elasticsearch supports aggregations that allow you to analyze data and extract summary information such as average, sum, minimum and maximum.
6. Solution for search scenarios: Elasticsearch is used for search scenarios in a large number of applications and systems, including search portals, monitoring systems, version control systems and others.
7. Scaling Functionality: Elasticsearch offers scaling and multitasking functionality to ensure high availability and performance on large systems.

Installation process

sudo apt update

sudo apt installs openjdk-11-jdk

wget -qO - https://artifacts.elastic.co/GPG-KEY-elasticsearch | sudo apt-adding a key -

echo "deb https://artifacts.elastic.co/packages/7.x/apt stable basic" | sudo tee /etc/apt/sources.list.d/elastic-7.x.list

sudo apt update

sudo apt install elasticsearch

Configure Elasticsearch by editing the configuration file /etc/elasticsearch/elasticsearch.yml:

sudo nano /etc/elasticsearch/elasticsearch.yml

Let's look at some of the most important settings:

cluster.name : name of the Elasticsearch cluster

node.name : Elasticsearch node name

network.host: IP address or host name on which Elasticsearch

http.port will run: Elasticsearch HTTP API port (default 9200)

memory.blocked: true to allow Elasticsearch to lock memory in the page area, which reduces the chance of context switching and improves performance.

Launch Elasticsearch and configure autorun:

sudo systemctl launch elasticsearch

sudo systemctl enable elasticsearch

Check that Elasticsearch is working by sending a request to its API:

curl http://localhost:9200/

You should see the response with the status and information about the Elasticsearch version, for example:

{

"name": "my-Elasticsearch in-node",

"cluster" : "my-Elasticsearch in cluster",

"cluster_uuid": "xxxxxx-XXXX-XXXX-xxxx-xxxxxx",

"version" : {

"number" : "7.15.1",

"build_flavor" : "default",

"build_type" : "deb",

"build_hash" : "83c34f456ae29d60e94d886e455e6a3409bba9ed",

"build_date" : "2021-10-07T21:56:19.031608185Z",

"build_snapshot" : false,

"lucene_version" : "8.9.0",

"minimum_wire_compatibility_version" : "6.8.0",

"minimum_index_compatibility_version" : "6.0.0-beta1"

},

"tagline" : "You know, for search"

}