Volume Specification

The Nomad volume specification defines the schema for creating and registering This page provides reference information for the Nomad volume specification. Create and register Container Storage Interface (CSI) and dynamic host volumes using the volume create and volume register commands and the equivalent API endpoints. Define capability, mount options, topology requests, secrets, and parameters.

Some attributes are only be supported by one volume type or the other, or a specific operation, while others may have a different meaning for each action, so read the documentation for each attribute carefully.

Provide the file as either HCL or JSON to the commands and as JSON to the API. An example HCL configuration for a volume create command with a CSI volume:

id           = "ebs_prod_db1"
namespace    = "default"
name         = "database"
type         = "csi"
plugin_id    = "ebs-prod"
snapshot_id  = "snap-12345" # or clone_id, see below
capacity_max = "200G"
capacity_min = "100G"

capability {
  access_mode     = "single-node-reader-only"
  attachment_mode = "file-system"
}

capability {
  access_mode     = "single-node-writer"
  attachment_mode = "file-system"
}

mount_options {
  fs_type     = "ext4"
  mount_flags = ["noatime"]
}

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

secrets {
  example_secret = "xyzzy"
}

parameters {
  skuname = "Premium_LRS"
}