How to install OpenSearch without Docker on Ubuntu?

From an APT repository

Install the necessary packages.

sudo apt-get update && sudo apt-get -y install lsb-release ca-certificates curl gnupg2

Import the public GPG key. This key is used to verify that the APT repository is signed.

 curl -o- https://artifacts.opensearch.org/publickeys/opensearch.pgp | sudo gpg --dearmor --batch --yes -o /usr/share/keyrings/opensearch-keyring

Create an APT repository for OpenSearch:

echo "deb [signed-by=/usr/share/keyrings/opensearch-keyring] https://artifacts.opensearch.org/releases/bundle/opensearch/2.x/apt stable main" | sudo tee /etc/apt/sources.list.d/opensearch-2.x.list

Verify that the repository was created successfully.

 sudo apt-get update

With the repository information added, list all available versions of OpenSearch:

sudo apt list -a opensearch

Choose the version of OpenSearch you want to install:

sudo apt-get install opensearch

To install a specific version of OpenSearch:

# Specify the version manually using opensearch=<version>sudo apt-get install opensearch=2.7.0

Once complete, enable OpenSearch.

 sudo systemctl enable opensearch

Start OpenSearch.

 sudo systemctl start opensearch
 sudo systemctl status opensearch

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To verify that OpenSearch installed correctly.

Send a request to port 9200:

curl -X GET https://localhost:9200 -u 'admin:admin' --insecure

 get a response that looks like this:

 {
    "name" : "hostname",
    "cluster_name" : "opensearch",
    "cluster_uuid" : "6XNc9m2gTUSIoKDqJit0PA",
    "version" : {
       "distribution" : "opensearch",
       "number" : <version>,
       "build_type" : <build-type>,
       "build_hash" : <build-hash>,
       "build_date" : <build-date>,
       "build_snapshot" : false,
       "lucene_version" : <lucene-version>,
       "minimum_wire_compatibility_version" : "7.10.0",
       "minimum_index_compatibility_version" : "7.0.0"
    },
    "tagline" : "The OpenSearch Project: https://opensearch.org/"
 }