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Yandex Managed Service for MongoDB
  • Getting started
  • Step-by-step instructions
    • All instructions
    • Information about existing clusters
    • Creating clusters
    • Database migration to Yandex.Cloud
    • Connecting to databases
    • Stop and start the cluster
    • Changing cluster and database settings
    • MongoDB version upgrade
    • Database management
    • Managing hosts in a cluster
    • Managing database users
    • Managing backups
    • How to manage shards
    • Deleting clusters
  • Solutions
    • Sharding collections
  • Concepts
    • Relationship between service resources
    • Host classes
    • Network in Yandex Managed Service for MongoDB
    • Quotas and limits
    • Storage types
    • Backups
    • Replication
    • Sharding
    • Users and roles
    • Supported clients
  • Access management
  • Pricing policy
    • Current pricing policy
    • Archive
      • Before January 1, 2019
      • From January 1 to March 1, 2019
      • From March 1, 2019 to February 1, 2020
  • API reference
    • Authentication in the API
    • gRPC
      • Обзор
      • BackupService
      • ClusterService
      • DatabaseService
      • ResourcePresetService
      • UserService
      • OperationService
    • REST
      • Overview
      • Backup
        • Overview
        • get
        • list
      • Cluster
        • Overview
        • addHosts
        • addShard
        • backup
        • create
        • delete
        • deleteHosts
        • deleteShard
        • enableSharding
        • get
        • getShard
        • list
        • listBackups
        • listHosts
        • listLogs
        • listOperations
        • listShards
        • move
        • rescheduleMaintenance
        • resetupHosts
        • restartHosts
        • restore
        • start
        • stop
        • streamLogs
        • update
      • Database
        • Overview
        • create
        • delete
        • get
        • list
      • ResourcePreset
        • Overview
        • get
        • list
      • User
        • Overview
        • create
        • delete
        • get
        • grantPermission
        • list
        • revokePermission
        • update
      • Operation
        • Overview
        • get
  • Questions and answers
    • General questions
    • Questions about MongoDB
    • All questions on the same page
  1. Concepts
  2. Relationship between service resources

Relationship between service resources

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

    Each cluster consists of one or more database hosts, which are virtual machines with DBMS servers deployed on them. Cluster hosts may reside in different availability zones and even different availability regions. Learn more about Yandex.Cloud geography.

    • A cluster consisting of multiple hosts has automatic failover, because the hosts can take over each other's functions as the cluster's primary replica.

    • A single-host cluster is cheaper, but it doesn't guarantee fault tolerance.

    When creating a cluster, specify:

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

    • Environment: The environment where the cluster will be deployed:

      • PRODUCTION: For stable versions of your apps.
      • PRESTABLE: For testing, including the Managed Service for MongoDB service itself. The Prestable environment is first updated with new features, improvements, and bug fixes. However, not every update ensures backward compatibility.

    A database cluster created in a folder can be accessed by all VMs connected to the same cloud network. Learn more about networking.

    Alert

    The service can automatically access the system and diagnostic information of your databases to plot monitoring graphs and maintain the health of your cluster. The service never queries or uses the data that you saved to the database.

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