How to install OpenSearch on Ubuntu 20.04

Step 11: With the repository information added, list all available versions of OpenSearch by using the below command.

root@ubuntu:~# sudo apt list -a opensearch
Listing... Done
opensearch/stable 2.14.0 amd64
opensearch/stable 2.13.0 amd64
opensearch/stable 2.12.0 amd64
opensearch/stable 2.11.1 amd64
opensearch/stable 2.11.0 amd64
opensearch/stable 2.10.0 amd64
opensearch/stable 2.9.0 amd64
opensearch/stable 2.8.0 amd64
opensearch/stable 2.7.0 amd64
opensearch/stable 2.6.0 amd64
opensearch/stable 2.5.0 amd64

Step 12: For new installations of OpenSearch 2.12 and later, you must define a custom admin password in order to set up a demo security configuration.

root@ubuntu:~# env OPENSEARCH_INITIAL_ADMIN_PASSWORD=ka0JY8Hrg8KCcQ95  apt-get install opensearch=2.12.0
Reading package lists... Done
Building dependency tree
Reading state information... Done
opensearch is already the newest version (2.12.0).
0 upgraded, 0 newly installed, 0 to remove and 10 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] y
Setting up opensearch (2.12.0) ...
Running OpenSearch Post-Installation Script
### NOT starting on installation, please execute the following statements to configure opensearch service to start automatically using systemd
 sudo systemctl daemon-reload
 sudo systemctl enable opensearch.service
### You can start opensearch service by executing
 sudo systemctl start opensearch.service
### Create opensearch demo certificates in /etc/opensearch/
 See demo certs creation log in /var/log/opensearch/install_demo_configuration.log
### Upcoming breaking change in packaging
 In a future release of OpenSearch, we plan to change the permissions associated with access to installed files
 If you are configuring tools that require read access to the OpenSearch configuration files, we recommend you add the user that runs these tools to the 'opensearch' group
 For more information, see https://github.com/opensearch-project/opensearch-build/pull/4043
Processing triggers for libc-bin (2.31-0ubuntu9.15) ...

Step 13: Enable and Start opensearch by using the below command

root@ubuntu:~# systemctl enable opensearch
Synchronizing state of opensearch.service with SysV service script with /lib/systemd/systemd-sysv-install.
Executing: /lib/systemd/systemd-sysv-install enable opensearch
Created symlink /etc/systemd/system/multi-user.target.wants/opensearch.service → /lib/systemd/system/opensearch.service.
root@ubuntu:~# systemctl start opensearch

Step 14: Verify the status of opensearch by using the below command

root@ubuntu:~# systemctl status opensearch
● opensearch.service - OpenSearch
     Loaded: loaded (/lib/systemd/system/opensearch.service; enabled; vendor preset: enabled)
     Active: active (running) since Sat 2024-05-18 05:50:01 PDT; 2min 47s ago
       Docs: https://opensearch.org/
   Main PID: 8055 (java)
      Tasks: 69 (limit: 4556)
     Memory: 1.3G
     CGroup: /system.slice/opensearch.service
             └─8055 /usr/share/opensearch/jdk/bin/java -Xshare:auto -Dopensearch.networkaddress.cache.ttl=60 -Dopensearch.networkaddress.cache.negative.ttl=10 -XX:+AlwaysPreTouch -Xss1m -Djava.awt

May 18 05:49:26 ubuntu systemd-entrypoint[8055]: WARNING: System::setSecurityManager has been called by org.opensearch.bootstrap.OpenSearch (file:/usr/share/opensearch/lib/opensearch-2.12.0.jar)
May 18 05:49:26 ubuntu systemd-entrypoint[8055]: WARNING: Please consider reporting this to the maintainers of org.opensearch.bootstrap.OpenSearch
May 18 05:49:26 ubuntu systemd-entrypoint[8055]: WARNING: System::setSecurityManager will be removed in a future release
May 18 05:49:28 ubuntu systemd-entrypoint[8055]: May 18, 2024 5:49:28 AM sun.util.locale.provider.LocaleProviderAdapter <clinit>
May 18 05:49:28 ubuntu systemd-entrypoint[8055]: WARNING: COMPAT locale provider will be removed in a future release
May 18 05:49:30 ubuntu systemd-entrypoint[8055]: WARNING: A terminally deprecated method in java.lang.System has been called
May 18 05:49:30 ubuntu systemd-entrypoint[8055]: WARNING: System::setSecurityManager has been called by org.opensearch.bootstrap.Security (file:/usr/share/opensearch/lib/opensearch-2.12.0.jar)
May 18 05:49:30 ubuntu systemd-entrypoint[8055]: WARNING: Please consider reporting this to the maintainers of org.opensearch.bootstrap.Security
May 18 05:49:30 ubuntu systemd-entrypoint[8055]: WARNING: System::setSecurityManager will be removed in a future release
May 18 05:50:01 ubuntu systemd[1]: Started OpenSearch.

Step 15: Send requests to port 9200 to verify that OpenSearch is running. Note the use of the --insecure flag, which is required because the TLS certificates are self-signed.

root@ubuntu:~# curl -X GET https://localhost:9200 -u 'admin:ka0JY8Hrg8KCcQ95' –insecure

You should get a response that looks like this:

{
  "name" : "ubuntu",
  "cluster_name" : "opensearch",
  "cluster_uuid" : "ntJOWmC8T4GjLPZWJ8FHXw",
  "version" : {
    "distribution" : "opensearch",
    "number" : "2.12.0",
    "build_type" : "deb",
    "build_hash" : "2c355ce1a427e4a528778d4054436b5c4b756221",
    "build_date" : "2024-02-20T02:18:31.541484890Z",
    "build_snapshot" : false,
    "lucene_version" : "9.9.2",
    "minimum_wire_compatibility_version" : "7.10.0",
    "minimum_index_compatibility_version" : "7.0.0"
  },
  "tagline" : "The OpenSearch Project: https://opensearch.org/"
}

Step 16: Query the plugins endpoint by using the below command

root@ubuntu:~# curl -X GET https://localhost:9200/_cat/plugins?v -u 'admin:ka0JY8Hrg8KCcQ95' –insecure

The response should look like this:

name   component                            version
ubuntu opensearch-alerting                  2.12.0.0
ubuntu opensearch-anomaly-detection         2.12.0.0
ubuntu opensearch-asynchronous-search       2.12.0.0
ubuntu opensearch-cross-cluster-replication 2.12.0.0
ubuntu opensearch-custom-codecs             2.12.0.0
ubuntu opensearch-flow-framework            2.12.0.0
ubuntu opensearch-geospatial                2.12.0.0
ubuntu opensearch-index-management          2.12.0.0
ubuntu opensearch-job-scheduler             2.12.0.0
ubuntu opensearch-knn                       2.12.0.0
ubuntu opensearch-ml                        2.12.0.0
ubuntu opensearch-neural-search             2.12.0.0
ubuntu opensearch-notifications             2.12.0.0
ubuntu opensearch-notifications-core        2.12.0.0
ubuntu opensearch-observability             2.12.0.0
ubuntu opensearch-performance-analyzer      2.12.0.0
ubuntu opensearch-reports-scheduler         2.12.0.0
ubuntu opensearch-security                  2.12.0.0
ubuntu opensearch-security-analytics        2.12.0.0
ubuntu opensearch-skills                    2.12.0.0
ubuntu opensearch-sql                       2.12.0.0

Conclusion:

We have reached the end of this article. In this guide, we have walked you through the steps required to install OpenSearch on Ubuntu 20.04. Your feedback is much welcome.