Resource relationships in Managed Service for OpenSearch

OpenSearch is a specialized distributed system for storing, searching, visualizing, and analyzing data. When you add a document to OpenSearch, it is placed into an index. Data from an indexed document is available for search and analysis.

OpenSearch features OpenSearch Dashboards, a data visualization UI.

The main entity used in Managed Service for OpenSearch is a database cluster.

Each cluster consists of one or more hosts, i.e., virtual machines with DBMS servers deployed on them. Cluster hosts may reside in different availability zones. The minimum number of hosts in a cluster depends on the selected disk type.

When creating a cluster, specify the following:

• Host classes: VM templates for deploying the cluster hosts.

• Host groups: Groups of multiple linked hosts with specific configuration and roles:

  • DATA: Enable index storage and request processing.
  • MANAGER: Ensure fault tolerance of all OpenSearch components.
  • DASHBOARDS: Provide access to OpenSearch Dashboards.

  A single-host cluster is not fault tolerant. A cluster with multiple hosts automatically provides fault tolerance for the MANAGER role. To ensure data safety in such a cluster, you need to configure index sharding and replication.

• Environment where the cluster will be deployed:

  • PRODUCTION: For stable versions of your apps.
  • PRESTABLE: For testing purposes. The prestable environment is similar to the production environment and likewise covered by the SLA, but it is the first to get new functionalities, improvements, and bug fixes. In the prestable environment, you can test compatibility of new versions with your application.

An OpenSearch cluster created in a folder can be accessed by all VMs connected to the same cloud network as the cluster.