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[ aws . efs ]



Returns the description of a specific Amazon EFS file system if either the file system CreationToken or the FileSystemId is provided. Otherwise, it returns descriptions of all file systems owned by the caller's Amazon Web Services account in the Amazon Web Services Region of the endpoint that you're calling.

When retrieving all file system descriptions, you can optionally specify the MaxItems parameter to limit the number of descriptions in a response. This number is automatically set to 100. If more file system descriptions remain, Amazon EFS returns a NextMarker , an opaque token, in the response. In this case, you should send a subsequent request with the Marker request parameter set to the value of NextMarker .

To retrieve a list of your file system descriptions, this operation is used in an iterative process, where DescribeFileSystems is called first without the Marker and then the operation continues to call it with the Marker parameter set to the value of the NextMarker from the previous response until the response has no NextMarker .

The order of file systems returned in the response of one DescribeFileSystems call and the order of file systems returned across the responses of a multi-call iteration is unspecified.

This operation requires permissions for the elasticfilesystem:DescribeFileSystems action.

See also: AWS API Documentation

describe-file-systems is a paginated operation. Multiple API calls may be issued in order to retrieve the entire data set of results. You can disable pagination by providing the --no-paginate argument. When using --output text and the --query argument on a paginated response, the --query argument must extract data from the results of the following query expressions: FileSystems


[--max-items <value>]
[--creation-token <value>]
[--file-system-id <value>]
[--cli-input-json <value>]
[--starting-token <value>]
[--page-size <value>]
[--generate-cli-skeleton <value>]
[--endpoint-url <value>]
[--output <value>]
[--query <value>]
[--profile <value>]
[--region <value>]
[--version <value>]
[--color <value>]
[--ca-bundle <value>]
[--cli-read-timeout <value>]
[--cli-connect-timeout <value>]


--max-items (integer)

The total number of items to return in the command's output. If the total number of items available is more than the value specified, a NextToken is provided in the command's output. To resume pagination, provide the NextToken value in the starting-token argument of a subsequent command. Do not use the NextToken response element directly outside of the AWS CLI.

For usage examples, see Pagination in the AWS Command Line Interface User Guide .

--creation-token (string)

(Optional) Restricts the list to the file system with this creation token (String). You specify a creation token when you create an Amazon EFS file system.

--file-system-id (string)

(Optional) ID of the file system whose description you want to retrieve (String).

--cli-input-json (string) Performs service operation based on the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, the CLI values will override the JSON-provided values. It is not possible to pass arbitrary binary values using a JSON-provided value as the string will be taken literally.

--starting-token (string)

A token to specify where to start paginating. This is the NextToken from a previously truncated response.

For usage examples, see Pagination in the AWS Command Line Interface User Guide .

--page-size (integer)

The size of each page to get in the AWS service call. This does not affect the number of items returned in the command's output. Setting a smaller page size results in more calls to the AWS service, retrieving fewer items in each call. This can help prevent the AWS service calls from timing out.

For usage examples, see Pagination in the AWS Command Line Interface User Guide .

--generate-cli-skeleton (string) Prints a JSON skeleton to standard output without sending an API request. If provided with no value or the value input, prints a sample input JSON that can be used as an argument for --cli-input-json. If provided with the value output, it validates the command inputs and returns a sample output JSON for that command.

Global Options

--debug (boolean)

Turn on debug logging.

--endpoint-url (string)

Override command's default URL with the given URL.

--no-verify-ssl (boolean)

By default, the AWS CLI uses SSL when communicating with AWS services. For each SSL connection, the AWS CLI will verify SSL certificates. This option overrides the default behavior of verifying SSL certificates.

--no-paginate (boolean)

Disable automatic pagination.

--output (string)

The formatting style for command output.

  • json
  • text
  • table

--query (string)

A JMESPath query to use in filtering the response data.

--profile (string)

Use a specific profile from your credential file.

--region (string)

The region to use. Overrides config/env settings.

--version (string)

Display the version of this tool.

--color (string)

Turn on/off color output.

  • on
  • off
  • auto

--no-sign-request (boolean)

Do not sign requests. Credentials will not be loaded if this argument is provided.

--ca-bundle (string)

The CA certificate bundle to use when verifying SSL certificates. Overrides config/env settings.

--cli-read-timeout (int)

The maximum socket read time in seconds. If the value is set to 0, the socket read will be blocking and not timeout. The default value is 60 seconds.

--cli-connect-timeout (int)

The maximum socket connect time in seconds. If the value is set to 0, the socket connect will be blocking and not timeout. The default value is 60 seconds.



To use the following examples, you must have the AWS CLI installed and configured. See the Getting started guide in the AWS CLI User Guide for more information.

Unless otherwise stated, all examples have unix-like quotation rules. These examples will need to be adapted to your terminal's quoting rules. See Using quotation marks with strings in the AWS CLI User Guide .

To describe a file system

The following describe-file-systems example describes the specified file system.

aws efs describe-file-systems \
    --file-system-id fs-c7a0456e


    "FileSystems": [
            "OwnerId": "123456789012",
            "CreationToken": "console-d7f56c5f-e433-41ca-8307-9d9c0example",
            "FileSystemId": "fs-c7a0456e",
            "FileSystemArn": "arn:aws:elasticfilesystem:us-west-2:123456789012:file-system/fs-48499b4d",
            "CreationTime": 1595286880.0,
            "LifeCycleState": "available",
            "Name": "my-file-system",
            "NumberOfMountTargets": 3,
            "SizeInBytes": {
                "Value": 6144,
                "Timestamp": 1600991437.0,
                "ValueInIA": 0,
                "ValueInStandard": 6144
            "PerformanceMode": "generalPurpose",
            "Encrypted": true,
            "KmsKeyId": "arn:aws:kms:us-west-2:123456789012:key/a59b3472-e62c-42e4-adcf-30d92example",
            "ThroughputMode": "bursting",
            "Tags": [
                    "Key": "Name",
                    "Value": "my-file-system"

For more information, see Managing Amazon EFS file systems in the Amazon Elastic File System User Guide.


Marker -> (string)

Present if provided by caller in the request (String).

FileSystems -> (list)

An array of file system descriptions.


A description of the file system.

OwnerId -> (string)

The Amazon Web Services account that created the file system.

CreationToken -> (string)

The opaque string specified in the request.

FileSystemId -> (string)

The ID of the file system, assigned by Amazon EFS.

FileSystemArn -> (string)

The Amazon Resource Name (ARN) for the EFS file system, in the format arn:aws:elasticfilesystem:*region* :*account-id* :file-system/*file-system-id* `` . Example with sample data: ``arn:aws:elasticfilesystem:us-west-2:1111333322228888:file-system/fs-01234567

CreationTime -> (timestamp)

The time that the file system was created, in seconds (since 1970-01-01T00:00:00Z).

LifeCycleState -> (string)

The lifecycle phase of the file system.

Name -> (string)

You can add tags to a file system, including a Name tag. For more information, see CreateFileSystem . If the file system has a Name tag, Amazon EFS returns the value in this field.

NumberOfMountTargets -> (integer)

The current number of mount targets that the file system has. For more information, see CreateMountTarget .

SizeInBytes -> (structure)

The latest known metered size (in bytes) of data stored in the file system, in its Value field, and the time at which that size was determined in its Timestamp field. The Timestamp value is the integer number of seconds since 1970-01-01T00:00:00Z. The SizeInBytes value doesn't represent the size of a consistent snapshot of the file system, but it is eventually consistent when there are no writes to the file system. That is, SizeInBytes represents actual size only if the file system is not modified for a period longer than a couple of hours. Otherwise, the value is not the exact size that the file system was at any point in time.

Value -> (long)

The latest known metered size (in bytes) of data stored in the file system.

Timestamp -> (timestamp)

The time at which the size of data, returned in the Value field, was determined. The value is the integer number of seconds since 1970-01-01T00:00:00Z.

ValueInIA -> (long)

The latest known metered size (in bytes) of data stored in the Infrequent Access storage class.

ValueInStandard -> (long)

The latest known metered size (in bytes) of data stored in the Standard storage class.

PerformanceMode -> (string)

The performance mode of the file system.

Encrypted -> (boolean)

A Boolean value that, if true, indicates that the file system is encrypted.

KmsKeyId -> (string)

The ID of an KMS key used to protect the encrypted file system.

ThroughputMode -> (string)

Displays the file system's throughput mode. For more information, see Throughput modes in the Amazon EFS User Guide .

ProvisionedThroughputInMibps -> (double)

The amount of provisioned throughput, measured in MiB/s, for the file system. Valid for file systems using ThroughputMode set to provisioned .

AvailabilityZoneName -> (string)

Describes the Amazon Web Services Availability Zone in which the file system is located, and is valid only for file systems using One Zone storage classes. For more information, see Using EFS storage classes in the Amazon EFS User Guide .

AvailabilityZoneId -> (string)

The unique and consistent identifier of the Availability Zone in which the file system's One Zone storage classes exist. For example, use1-az1 is an Availability Zone ID for the us-east-1 Amazon Web Services Region, and it has the same location in every Amazon Web Services account.

Tags -> (list)

The tags associated with the file system, presented as an array of Tag objects.


A tag is a key-value pair. Allowed characters are letters, white space, and numbers that can be represented in UTF-8, and the following characters:+ - = . _ : / .

Key -> (string)

The tag key (String). The key can't start with aws: .

Value -> (string)

The value of the tag key.

NextMarker -> (string)

Present if there are more file systems than returned in the response (String). You can use the NextMarker in the subsequent request to fetch the descriptions.