Resource relationships in Managed Service for MongoDB

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

Each cluster consists of one or more DB hosts, which are virtual machines with DBMS servers deployed. Cluster hosts may reside in different availability zones and even different availability regions. You can learn more about Yandex Cloud availability zones in Platform overview.

• A multi-host cluster is natively fault tolerant because its hosts can step in for one another in the primary replica capacity.

• A single-host cluster is less costly but it does not guarantee fault tolerance.

When creating a cluster, specify:

• Host class: VM template for deploying the cluster hosts. For a list of available host classes and their specs, see Host classes.

• Environment: 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.

A cluster created in a folder can be accessed by all VMs connected to the same cloud network. For more information about networking, see the Virtual Private Cloud documentation.