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Volumes HTTP API

The /volume and /volumes endpoints are used to query for and interact with volumes.

List Volumes

This endpoint lists all volumes.

MethodPathProduces
GET/v1/volumesapplication/json

The table below shows this endpoint's support for blocking queries and required ACLs.

Blocking QueriesACL Required
YESnamespace:csi-list-volume

Parameters

  • type (string: "") - Specifies the type of volume to query. Currently only supports csi. This is specified as a query string parameter. Returns an empty list if omitted.

  • node_id (string: "") - Specifies a string to filter volumes based on an Node ID prefix. Because the value is decoded to bytes, the prefix must have an even number of hexadecimal characters (0-9a-f). This is specified as a query string parameter.

  • plugin_id (string: "") - Specifies a string to filter volumes based on a plugin ID prefix. Because the value is decoded to bytes, the prefix must have an even number of hexadecimal characters (0-9a-f). This is specified as a query string parameter.

  • next_token (string: "") - This endpoint supports paging. The next_token parameter accepts a string which identifies the next expected volume. This value can be obtained from the X-Nomad-NextToken header from the previous response.

  • per_page (int: 0) - Specifies a maximum number of volumes to return for this request. If omitted, the response is not paginated. The value of the X-Nomad-NextToken header of the last response can be used as the next_token of the next request to fetch additional pages.

  • filter (string: "") - Specifies the expression used to filter the results. Consider using pagination or a query parameter to reduce resource used to serve the request.

Sample Request

$ curl \
    https://localhost:4646/v1/volumes?type=csi&node_id=foo&plugin_id=plugin-id1

Sample Response

[
  {
    "ID": "volume-id1",
    "ExternalID": "vol-abcdef",
    "Namespace": "default",
    "Name": "volume id1",
    "Topologies": [
      {
        "foo": "bar"
      }
    ],
    "AccessMode": "multi-node-single-writer",
    "AttachmentMode": "file-system",
    "CurrentReaders": 2,
    "CurrentWriters": 1,
    "Schedulable": true,
    "PluginID": "plugin-id1",
    "Provider": "ebs",
    "ControllerRequired": true,
    "ControllersHealthy": 3,
    "ControllersExpected": 3,
    "NodesHealthy": 15,
    "NodesExpected": 18,
    "ResourceExhausted": 0,
    "CreateIndex": 42,
    "ModifyIndex": 64
  }
]

Read Volume

This endpoint reads information about a specific volume.

MethodPathProduces
GET/v1/volume/csi/:volume_idapplication/json

The table below shows this endpoint's support for blocking queries and required ACLs.

Blocking QueriesACL Required
YESnamespace:csi-read-volume

Parameters

  • :volume_id (string: <required>) - Specifies the ID of the volume. This must be the full ID. This is specified as part of the path.

Sample Request

$ curl \
    https://localhost:4646/v1/volume/csi/volume-id1

Sample Response

{
  "ID": "volume-id1",
  "Name": "volume id1",
  "Namespace": "default",
  "ExternalID": "vol-abcdef",
  "Topologies": [{ "foo": "bar" }],
  "AccessMode": "multi-node-single-writer",
  "AttachmentMode": "file-system",
  "RequestedCapabilities": [
    {
      "AccessMode": "single-node-writer",
      "AttachmentMode": "file-system"
    },
    {
      "AccessMode": "single-node-writer",
      "AttachmentMode": "block-device"
    }
  ],
  "Allocations": [
    {
      "ID": "a8198d79-cfdb-6593-a999-1e9adabcba2e",
      "EvalID": "5456bd7a-9fc0-c0dd-6131-cbee77f57577",
      "Name": "example.cache[0]",
      "NodeID": "fb2170a8-257d-3c64-b14d-bc06cc94e34c",
      "PreviousAllocation": "516d2753-0513-cfc7-57ac-2d6fac18b9dc",
      "NextAllocation": "cd13d9b9-4f97-7184-c88b-7b451981616b",
      "RescheduleTracker": {
        "Events": [
          {
            "PrevAllocID": "516d2753-0513-cfc7-57ac-2d6fac18b9dc",
            "PrevNodeID": "9230cd3b-3bda-9a3f-82f9-b2ea8dedb20e",
            "RescheduleTime": 1517434161192946200,
            "Delay": "5000000000"
          }
        ]
      },
      "JobID": "example",
      "TaskGroup": "cache",
      "DesiredStatus": "run",
      "DesiredDescription": "",
      "ClientStatus": "running",
      "ClientDescription": "",
      "TaskStates": {
        "redis": {
          "State": "running",
          "FinishedAt": "0001-01-01T00:00:00Z",
          "LastRestart": "0001-01-01T00:00:00Z",
          "Restarts": 0,
          "StartedAt": "2017-07-25T23:36:26.106431265Z",
          "Failed": false,
          "Events": [
            {
              "Type": "Received",
              "Time": 1495747371795703800,
              "FailsTask": false,
              "RestartReason": "",
              "SetupError": "",
              "DriverError": "",
              "ExitCode": 0,
              "Signal": 0,
              "Message": "",
              "KillTimeout": 0,
              "KillError": "",
              "KillReason": "",
              "StartDelay": 0,
              "DownloadError": "",
              "ValidationError": "",
              "DiskLimit": 0,
              "FailedSibling": "",
              "VaultError": "",
              "TaskSignalReason": "",
              "TaskSignal": "",
              "DriverMessage": ""
            },
            {
              "Type": "Driver",
              "Time": 1495747371798867200,
              "FailsTask": false,
              "RestartReason": "",
              "SetupError": "",
              "DriverError": "",
              "ExitCode": 0,
              "Signal": 0,
              "Message": "",
              "KillTimeout": 0,
              "KillError": "",
              "KillReason": "",
              "StartDelay": 0,
              "DownloadError": "",
              "ValidationError": "",
              "DiskLimit": 0,
              "FailedSibling": "",
              "VaultError": "",
              "TaskSignalReason": "",
              "TaskSignal": "",
              "DriverMessage": "Downloading image redis:7"
            },
            {
              "Type": "Started",
              "Time": 1495747379525667800,
              "FailsTask": false,
              "RestartReason": "",
              "SetupError": "",
              "DriverError": "",
              "ExitCode": 0,
              "Signal": 0,
              "Message": "",
              "KillTimeout": 0,
              "KillError": "",
              "KillReason": "",
              "StartDelay": 0,
              "DownloadError": "",
              "ValidationError": "",
              "DiskLimit": 0,
              "FailedSibling": "",
              "VaultError": "",
              "TaskSignalReason": "",
              "TaskSignal": "",
              "DriverMessage": ""
            }
          ]
        }
      },
      "CreateIndex": 54,
      "ModifyIndex": 57,
      "CreateTime": 1495747371794276400,
      "ModifyTime": 1495747371794276400
    }
  ],
  "ReadAllocs": {
    "a8198d79-cfdb-6593-a999-1e9adabcba2e": null
  },
  "WriteAllocs": {},
  "Schedulable": true,
  "PluginID": "plugin-id1",
  "Provider": "ebs",
  "Version": "1.0.1",
  "ControllerRequired": true,
  "ControllersHealthy": 3,
  "ControllersExpected": 3,
  "NodesHealthy": 15,
  "NodesExpected": 18,
  "ResourceExhausted": 0,
  "CreateIndex": 42,
  "ModifyIndex": 64
}

Register Volume

This endpoint registers an external volume with Nomad. The volume must exist in the external storage provider (see Create Volume below).

Making the same request again with a higher RequestedCapacityMin value may trigger a Volume Expansion.

MethodPathProduces
PUT/v1/volume/csi/:volume_idapplication/json

The table below shows this endpoint's support for blocking queries and required ACLs.

Blocking QueriesACL Required
NOnamespace:csi-write-volume

Parameters

  • :volume_id (string: <required>) - Specifies the ID of the volume. This must be the full ID. This is specified as part of the path.

Sample Payload

The payload must include a JSON document that describes the volume's parameters.

{
  "Volumes": [
    {
      "ExternalID": "vol-abcdef",
      "ID": "volume-id1",
      "Name": "volume one",
      "Namespace": "default",
      "PluginID": "plugin-id1",
      "RequestedCapabilities": [
        {
          "AccessMode": "single-node-writer",
          "AttachmentMode": "file-system"
        },
        {
          "AccessMode": "single-node-writer",
          "AttachmentMode": "block-device"
        }
      ],
      "Secrets": {
        "password": "xyzzy"
      },
      "Topologies": [{ "foo": "bar" }]
    }
  ]
}

Sample Request

$ curl \
    --request PUT \
    --data @payload.json \
    https://localhost:4646/v1/volume/csi/volume-id1

Create Volume

This endpoint creates a volume in an external storage provider and registers it with Nomad. Only CSI plugins that implement the Controller interface with the CREATE_DELETE_VOLUME capability support this endpoint.

Making the same request again with a higher RequestedCapacityMin value may trigger a Volume Expansion.

MethodPathProduces
PUT/v1/volume/csi/:volume_id/createapplication/json

The table below shows this endpoint's support for blocking queries and required ACLs.

Blocking QueriesACL Required
NOnamespace:csi-write-volume

Parameters

  • :volume_id (string: <required>) - Specifies the ID of the volume. This must be the full ID. This is specified as part of the path.

Sample Payload

The payload must include a JSON document that describes the volume's parameters.

{
  "Volumes": [
    {
      "ID": "volume-id1",
      "Name": "volume one",
      "Namespace": "default",
      "PluginID": "plugin-id1",
      "MountOptions": {
        "FsType": "ext4",
        "MountFlags": ["ro", "noatime"],
      },
      "RequestedCapacityMin": 10737418240,
      "RequestedCapacityMax": 21474836480,
      "RequestedCapabilities": [
        {
          "AccessMode": "single-node-writer",
          "AttachmentMode": "file-system"
        },
        {
          "AccessMode": "single-node-writer",
          "AttachmentMode": "block-device"
        }
      ],
      "Secrets": {
        "password": "xyzzy"
      },
      "SnapshotID": "snap-12345",
      "Topologies": [{ "foo": "bar" }]
    }
  ]
}

Sample Request

$ curl \
    --request PUT \
    --data @payload.json \
    https://localhost:4646/v1/volume/csi/volume-id1

Deregister Volume

This endpoint deregisters an external volume with Nomad. It is an error to deregister a volume that is in use.

MethodPathProduces
DELETE/v1/volume/csi/:volume_idapplication/json

The table below shows this endpoint's support for blocking queries and required ACLs.

Blocking QueriesACL Required
NOnamespace:csi-write-volume

Parameters

  • :volume_id (string: <required>) - Specifies the ID of the volume. This must be the full ID. This is specified as part of the path.

  • force (bool: false) - Force deregistration of the volume and immediately drop claims for terminal allocations. Returns an error if the volume has running allocations. This does not detach the volume from client nodes. This is specified as a query string parameter.

Sample Request

$ curl \
    --request DELETE \
    https://localhost:4646/v1/volume/csi/volume-id1?force=false

Delete Volume

This endpoint deletes an external volume from the storage provider, and deregisters it from Nomad. It is an error to delete a volume that is in use. Only CSI plugins that implement the Controller interface with the CREATE_DELETE_VOLUME capability support this endpoint.

MethodPathProduces
DELETE/v1/volume/csi/:volume_id/deleteapplication/json

The table below shows this endpoint's support for blocking queries and required ACLs.

Blocking QueriesACL Required
NOnamespace:csi-write-volume

This endpoint accepts a X-Nomad-CSI-Secrets header to set secrets for deleting the volume as comma-separated key-value pairs (see the example below). These secrets will be merged with any secrets already stored when the CSI volume was created.

Parameters

  • :volume_id (string: <required>) - Specifies the ID of the volume. This must be the full ID. This is specified as part of the path.

Sample Request

$ curl \
    --request DELETE \
    -H "X-Nomad-CSI-Secrets: secret-key-1=value-1,secret-key-2=value-2" \
    https://localhost:4646/v1/volume/csi/volume-id1/delete

Detach Volume

This endpoint detaches an external volume from a Nomad client node. It is an error to detach a volume that is in use.

MethodPathProduces
DELETE/v1/volume/csi/:volume_id/detachapplication/json

The table below shows this endpoint's support for blocking queries and required ACLs.

Blocking QueriesACL Required
NOnamespace:csi-write-volume

Parameters

  • :volume_id (string: <required>) - Specifies the ID of the volume. This must be the full ID. This is specified as part of the path.

  • node (string: <required>) - The node to detach the volume from. This is specified as a query string parameter.

Sample Request

$ curl \
    --request DELETE \
    https://localhost:4646/v1/volume/csi/volume-id/detach?node=00000000-0000-0000-0000-000000000000

List External Volumes

This endpoint lists storage volumes that are known to the external storage provider but may not be registered with Nomad. Only CSI plugins that implement the Controller interface with the LIST_VOLUMES capability support this endpoint.

MethodPathProduces
GET/v1/volumes/externalapplication/json

The table below shows this endpoint's support for blocking queries and required ACLs.

Blocking QueriesACL Required
YESnamespace:csi-write-volume

Parameters

  • plugin_id (string: "") - Specifies a string to filter volumes based on a plugin ID prefix. Because the value is decoded to bytes, the prefix must have an even number of hexadecimal characters (0-9a-f). This is specified as a query string parameter.

  • next_token (string: "") - This endpoint supports paging. The next_token parameter accepts a string returned in a previous response's NextToken field to request the next page of results.

  • per_page (int: <required>) - Specifies a maximum number of snapshots to return for this request. The response will include a NextToken field that can be passed to the next request to fetch additional pages.

Sample Request

$ curl \
    https://localhost:4646/v1/volumes/external?&plugin_id=plugin-id1&per_page=2

Sample Response

{
  "NextToken": "eyJ2IjoiMiIsImMiOiJLZ",
  "Volumes": [
    {
      "ExternalID": "vol-37ac485e",
      "CapacityBytes": 1000000,
      "SnapshotID": "snap-12345",
      "PublishedExternalNodeIDs": ["i-12345", "i-abcde"],
      "IsAbnormal": false,
      "Status": ""
    },
    {
      "ExternalID": "vol-10ac4879",
      "CapacityBytes": 1000000,
      "SnapshotID": "snap-abcdef",
      "PublishedExternalNodeIDs": ["i-12345", "i-abcde"],
      "IsAbnormal": true,
      "Status": "example error message from provider"
    }
  ]
}

Create Snapshot

This endpoint creates a snapshot of a volume on the external storage provider. Only CSI plugins that implement the Controller interface with the CREATE_DELETE_SNAPSHOT capability support this endpoint.

MethodPathProduces
POST/v1/volumes/snapshotapplication/json

The table below shows this endpoint's support for blocking queries and required ACLs.

Blocking QueriesACL Required
NOnamespace:csi-write-volume

Sample Payload

The payload must include a JSON document that describes the snapshot's parameters.

{
  "Snapshots": [
    {
      "SourceVolumeID": "volume-id1",
      "PluginID": "plugin-id1",
      "Name": "mysnap",
      "Secrets": {
        "password": "xyzzy"
      },
      "Parameters": {
        "example": "infrequent_access"
      }
    }
  ]
}

Sample Request

$ curl \
    --request POST \
    --data @payload.json \
    https://localhost:4646/v1/volumes/snapshot

Sample Response

{
  "Snapshots": [
    {
      "ID": "snap-031f5f7e3406d594a",
      "SizeBytes": 10737418240,
      "CreateTime": 1617909982,
      "IsReady": false,
      "SourceVolumeID": "volume-id1"
    }
  ]
}

Delete Snapshot

This endpoint deletes a volume snapshot from the external storage provider. Only CSI plugins that implement the Controller interface with the CREATE_DELETE_SNAPSHOT capability support this endpoint.

MethodPathProduces
DELETE/v1/volumes/snapshotapplication/json

The table below shows this endpoint's support for blocking queries and required ACLs.

Blocking QueriesACL Required
NOnamespace:csi-write-volume

This endpoint accepts a X-Nomad-CSI-Secrets header to set secrets for deleting the snapshot as comma-separated key-value pairs (see the example below). These secrets will be merged with any secrets already stored when the CSI snapshot was created.

Parameters

  • plugin_id (string: <required>) - Specifies the prefix of a CSI plugin ID to perform the delete. Because the value is decoded to bytes, the prefix must have an even number of hexadecimal characters (0-9a-f). This is specified as a query string parameter.

  • snapshot_id (string: <required>) - Specifies the snapshot ID to delete. This is specified as a query parameter.

Sample Request

$ curl \
    --request DELETE \
    -H "X-Nomad-CSI-Secrets: secret-key-1=value-1,secret-key-2=value-2" \
    https://localhost:4646/v1/volumes/snapshot

List Snapshots

This endpoint lists volume snapshots on the external storage provider. Only CSI plugins that implement the Controller interface with the LIST_SNAPSHOTS capability support this endpoint.

MethodPathProduces
GET/v1/volumes/snapshotapplication/json

The table below shows this endpoint's support for blocking queries and required ACLs.

Blocking QueriesACL Required
YESnamespace:csi-list-volume

This endpoint accepts a X-Nomad-CSI-Secrets header to set secrets for deleting the snapshot as comma-separated key-value pairs (see the example below). These secrets will be merged with any secrets already stored when the CSI snapshot was created.

Parameters

  • plugin_id (string: <required>) - Specifies the prefix of a CSI plugin ID to perform the list. Because the value is decoded to bytes, the prefix must have an even number of hexadecimal characters (0-9a-f). This is specified as a query string parameter.

  • next_token (string: "") - This endpoint supports paging. The next_token parameter accepts a string returned in a previous response's NextToken field to request the next page of results.

  • per_page (int: <required>) - Specifies a maximum number of snapshots to return for this request. The response will include a NextToken field that can be passed to the next request to fetch additional pages.

Sample Request

$ curl \
    -H "X-Nomad-CSI-Secrets: secret-key-1=value-1,secret-key-2=value-2" \
    https://localhost:4646/v1/volumes/snapshot?plugin_id=plugin-id1&per_page=2

Sample Response

{
  "NextToken": "eyJ2IjoiMiIsImMiOiJLZ",
  "Snapshots": [
    {
      "CreateTime": 1227088980,
      "ExternalSourceVolumeID": "vol-37ac485e",
      "ID": "snap-9df717f4",
      "IsReady": true,
      "Parameters": null,
      "PluginID": "aws-ebs0",
      "SizeBytes": 2147483648
    },
    {
      "CreateTime": 1227091232,
      "ExternalSourceVolumeID": "vol-10ac4879",
      "ID": "snap-5cf81835",
      "IsReady": true,
      "Parameters": null,
      "PluginID": "aws-ebs0",
      "SizeBytes": 11811160064
    }
  ]
}
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