stratis - Man Page

Configure Stratis local storage pools


stratis [GLOBAL OPTIONS] pool <command> [args] [COMMAND OPTIONS]
stratis [GLOBAL OPTIONS] filesystem|fs <command> [args] [COMMAND OPTIONS]
stratis [GLOBAL OPTIONS] blockdev <command> [args] [COMMAND OPTIONS]
stratis [GLOBAL OPTIONS] key <command> [args] [COMMAND OPTIONS]
stratis [GLOBAL OPTIONS] report <report_name>
stratis [GLOBAL OPTIONS] daemon <redundancy|version>


stratis is a command-line tool to create, modify, and destroy Stratis pools, and the filesystems allocated from the pool.

Stratis creates a pool from one or more block devices (blockdevs), and then enables multiple filesystems to be created from the pool. The user can set keys for use with pool encryption.

Global Options


Show stratis-cli version.

--help, -h

Show help on command.


(For debugging.) Allow exceptions raised during execution to propagate.


pool create [--redundancy <redundancy>] [--key-desc <key_desc>] <pool_name> <blockdev> [<blockdev>..]

Create a pool from one or more block devices, with the given pool name.

pool list

List all pools on the system.

pool rename <old_pool_name> <new_pool_name>

Rename a pool.

pool destroy <pool_name>

Destroy a pool and all the filesystems created from it.

pool add-data <pool_name> <blockdev> [<blockdev>..]

Add one or more blockdevs to an existing pool, to enlarge its storage capacity.

pool init-cache <pool_name> <blockdev> [<blockdev>..]

Initialize a cache for an existing pool. Add one or more blockdevs to a pool, to be used as cache instead of additional storage. Typically, smaller and faster drives, such as SSDs, are used for this purpose.

pool add-cache <pool_name> <blockdev> [<blockdev>..]

Add one or more blockdevs to an existing pool with an initialized cache.

pool unlock

Unlock all devices that are part of an encrypted pool registered with stratisd but that have not yet been opened.

filesystem create <pool_name> <fs_name> [<fs_name>..]

Create one or more filesystems from the specified pool. NOTE: There is a temporary restriction on the number of filesystems that can be specified with this command. Specifying more than one filesystem will result in an error.

filesystem snapshot <pool_name> <fs_name> <snapshot_name>

Snapshot the filesystem in the specified pool.

filesystem list [pool_name]

List all filesystems that exist in the specified pool, or all pools, if no pool name is given.

filesystem destroy <pool_name> <fs_name> [<fs_name>..]

Destroy one or more filesystems that exist in the specified pool.

filesystem rename <pool_name> <fs_name> <new_name>

Rename a filesystem.

blockdev list [pool_name]

List all blockdevs that make up the specified pool, or all pools, if no pool name is given.

key set <(--keyfile-path <path> | --capture-key)> <key_desc>

Set a key in the kernel keyring for use with encryption.

key reset <(--keyfile-path <path> | --capture-key)> <key_desc>

Reset the key data of an existing key in the kernel keyring.

key unset <key_desc>

Unset a key in the kernel keyring so it is no longer available for encryption operations.

report <report_name>

Get a report from the daemon regarding its internal state. This command is not supported as the report names and returned JSON schemas are unstable and may be changed at any time.

daemon redundancy

List the redundancy levels that the Stratis service supports.

daemon version

Show the Stratis service’s version.



The redundancy for the created pool. The only option is "none" which is also the default.


The key description of the key that should be used to encrypt the created pool. The key description must correspond to a key set in the kernel keyring with the key command.

--keyfile-path <path> | --capture-key

These mutually exclusive options allow a user to specify a key used for encryption in one of two ways. The --keyfile-path option requires an argument, the path to a file containing the key. If the --capture-key option is selected instead, the user must enter the key at the ensuing prompt. The key value is terminated at the first newline character that the user enters, and does not include the newline character. On the other hand, if the file specified as an argument for the --keyfile-path option contains a newline character anywhere, the newline character will be included in the key value.

Environment Variables


Sets a timeout for any Stratis D-Bus call. If this environment variable is not set, a default value of 120 seconds is used for the timeout. The accepted STRATIS_DBUS_TIMEOUT environment variable values are:

  1. an integer between 0 (inclusive) and 1073741823 (inclusive), which represents the timeout length in milliseconds
  2. -1, which represents the libdbus default timeout

List Output Fields

FIELDS for stratis pool list


The name of the pool.

Total Physical

The physical usage statistics for the pool (Total / Used / Free).


Boolean valued properties that the pool may have. Each property has a two-letter camel-case code. If the pool does not have the property, a ~, for negation, is prepended to the property code. If the engine experienced an error when obtaining the property, a "?", representing "unknown", is prepended to the property code. The property codes are: Ca - indicates the pool has a cache, Cr - indicates the pool is encrypted.

FIELDS for stratis filesystem list

Pool Name

The name of the pool containing the filesystem.


The amount of storage space used in the pool by this filesystem.


The time the filesystem was created.


The device path to use for mounting the filesystem.


The UUID of the filesystem.

FIELDS for stratis blockdev list

Pool Name

The name of the pool using the block device.

Device Node

The device node of the block device.

Physical Size

The size of the device.


The data tier type ("Data" or "Cache")

FIELDS for stratis key list

Key Description

The key description corresponding to a key in the kernel keyring that that can be used for encryption.


Encryption and a cache are mutually exclusive choices. If a pool is encrypted, an attempt to initialize a cache will result in an error.

There is a restriction on the total size of the cache device of 32 TiB. Adding devices to the cache so that the cumulative size of all the devices in the cache exceeds 32 TiB will result in an error.


If a block device appears to be already in use, stratisd will refuse to claim it. To allow use with stratisd, any signature on the device must first be erased. Please carefully verify the identity and availability of the device before taking such a step.


Example 1. Creating a Stratis pool

stratis pool create mypool /dev/sdb /dev/sdc

Example 2. Creating an encrypted pool

stratis key set --capture-key someKeyDescription

stratis pool create --key-desc someKeyDescription mypool /dev/sdb /dev/sdc

Example 3. Creating a filesystem from a pool

stratis filesystem create mypool data1

See Also

mount(8), umount(8), fstab(5)

Reporting Bugs & Development

GitHub for issues and development, against either stratis-cli or stratisd projects, based on likelihood of issue being with the command-line tool or the service daemon.

Mailing list for general development discussion

Unknown values

If the stratisd D-Bus API returns values that stratis-cli cannot interpret, stratis-cli will substitute "???". If encountered, upgrading to the latest version of stratis-cli, or filing an issue, is recommended.

Unobtainable values

If the stratisd D-Bus API indicates that a value is unobtainable, stratis-cli will substitute "FAILURE". This may indicate something wrong with the pool, blockdev, or filesystem. In some cases, restarting stratisd may resolve the issue.


stratis-cli is licensed under the Apache License, Version 2.0. Software distributed under this license is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either expressed or implied.

Referenced By