LustreRootSquashConfiguration - Amazon FSx
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The configuration for Lustre root squash used to restrict root-level access from clients that try to access your FSx for Lustre file system as root. Use the RootSquash parameter to enable root squash. To learn more about Lustre root squash, see Lustre root squash.

You can also use the NoSquashNids parameter to provide an array of clients who are not affected by the root squash setting. These clients will access the file system as root, with unrestricted privileges.



When root squash is enabled, you can optionally specify an array of NIDs of clients for which root squash does not apply. A client NID is a Lustre Network Identifier used to uniquely identify a client. You can specify the NID as either a single address or a range of addresses:

  • A single address is described in standard Lustre NID format by specifying the client’s IP address followed by the Lustre network ID (for example,

  • An address range is described using a dash to separate the range (for example, 10.0.[2-10].[1-255]@tcp).

Type: Array of strings

Array Members: Maximum number of 64 items.

Length Constraints: Minimum length of 11. Maximum length of 43.

Pattern: ^([0-9\[\]\-]*\.){3}([0-9\[\]\-]*)@tcp$

Required: No


You enable root squash by setting a user ID (UID) and group ID (GID) for the file system in the format UID:GID (for example, 365534:65534). The UID and GID values can range from 0 to 4294967294:

  • A non-zero value for UID and GID enables root squash. The UID and GID values can be different, but each must be a non-zero value.

  • A value of 0 (zero) for UID and GID indicates root, and therefore disables root squash.

When root squash is enabled, the user ID and group ID of a root user accessing the file system are re-mapped to the UID and GID you provide.

Type: String

Length Constraints: Minimum length of 3. Maximum length of 21.

Pattern: ^([0-9]{1,10}):([0-9]{1,10})$

Required: No

See Also

For more information about using this API in one of the language-specific Amazon SDKs, see the following: