topology_request Block

Specify locations (region, zone, rack, etc.) where the provisioned volume must be accessible from or from where an existing volume is accessible from.

id           = "ebs_prod_db1"
namespace    = "default"
name         = "database"
type         = "csi"
plugin_id    = "ebs-prod"
capacity_max = "200G"
capacity_min = "100G"

topology_request {
  required {
    topology { segments { rack = "R2" } }
    topology { segments { rack = "R1", zone = "us-east-1a"} }
  }
  preferred {
    topology { segments { rack = "R1", zone = "us-east-1a"} }
  }
}

Consult the documentation for your storage provider and CSI plugin as to whether it supports defining topology and what values it expects for topology segments. Specifying topology segments that aren't supported by the storage provider may return an error or may be silently removed by the plugin.

topology_request Parameters

• required (Topology: nil) - On volume creation, the required topologies indicate that the volume must be created in a location accessible from at least one of the listed topologies. On volume registration the required topologies indicate that the volume was created in a location accessible from all the listed topologies.

• preferred (Topology: nil) - Indicate that you would prefer the storage provider to create the volume in one of the provided topologies. Only allowed on volume creation.

topology Parameters

• segments (map[string]string) - A map of location types to their values. The specific fields required are defined by the CSI plugin.

topology_request Examples

The following examples only show the topology_request blocks. Remember that the topology_request block is only valid in the placements listed above.

Volume creation with preferred and required topologies

This configuration indicates you require the volume to be created within racks R1 or R2, but that you prefer the volume to be created within R1.

topology_request {
  required {
    topology { segments { rack = "R1", zone = "us-east-1a" } }
    topology { segments { rack = "R2", zone = "us-east-1a" } }
  }
  preferred {
    topology { segments { rack = "R1", zone = "us-east-1a"} }
  }
}