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Chapter 27. Using snapshots on Stratis file systems

Chapter 27. Using snapshots on Stratis file systems

You can use snapshots on Stratis file systems to capture file system state at arbitrary times and restore it in the future.

Important

Stratis is a Technology Preview feature only. Technology Preview features are not supported with Red Hat production service level agreements (SLAs) and might not be functionally complete. Red Hat does not recommend using them in production. These features provide early access to upcoming product features, enabling customers to test functionality and provide feedback during the development process. For more information about the support scope of Red Hat Technology Preview features, see https://access.redhat.com/support/offerings/techpreview.

27.1. Characteristics of Stratis snapshots

In Stratis, a snapshot is a regular Stratis file system created as a copy of another Stratis file system.

The current snapshot implementation in Stratis is characterized by the following:

A snapshot of a file system is another file system.
A snapshot and its origin are not linked in lifetime. A snapshotted file system can live longer than the file system it was created from.
A file system does not have to be mounted to create a snapshot from it.
Each snapshot uses around half a gigabyte of actual backing storage, which is needed for the XFS log.

27.2. Creating a Stratis snapshot

You can create a Stratis file system as a snapshot of an existing Stratis file system.

Prerequisites

Stratis is installed and the stratisd service is running. For more information, see Installing Stratis.
You have created a Stratis file system. For more information, see Creating a Stratis file system.

Procedure

Create a Stratis snapshot:

Copy to Clipboard Toggle word wrap

stratis fs snapshot my-pool my-fs my-fs-snapshot

# stratis fs snapshot my-pool my-fs my-fs-snapshot

A snapshot is a first class Stratis file system. You can create multiple Stratis snapshots. These include snapshots of a single origin file system or another snapshot file system. If a file system is a snapshot, then its origin field will display the UUID of its origin file system in the detailed file system listing.

Additional resources

stratis(8) man page on your system

27.3. Accessing the content of a Stratis snapshot

You can mount a snapshot of a Stratis file system to make it accessible for read and write operations.

Prerequisites

Stratis is installed and the stratisd service is running. For more information, see Installing Stratis.
You have created a Stratis snapshot. For more information, see Creating a Stratis snapshot.

Procedure

To access the snapshot, mount it as a regular file system from the /dev/stratis/my-pool/ directory:
Copy to Clipboard Copied! Toggle word wrap Toggle overflow
```
mount /dev/stratis/my-pool/my-fs-snapshot mount-point
```
```
# mount /dev/stratis/my-pool/my-fs-snapshot mount-point
```

Additional resources

Mounting a Stratis file system
mount(8) man page on your system

27.4. Reverting a Stratis file system to a previous snapshot

You can revert the content of a Stratis file system to the state captured in a Stratis snapshot.

Prerequisites

Stratis is installed and the stratisd service is running. For more information, see Installing Stratis.
You have created a Stratis snapshot. For more information, see Creating a Stratis snapshot.

Procedure

Optional: Back up the current state of the file system to be able to access it later:
Copy to Clipboard Copied! Toggle word wrap Toggle overflow
```
stratis filesystem snapshot my-pool my-fs my-fs-backup
```
```
# stratis filesystem snapshot my-pool my-fs my-fs-backup
```

Unmount and remove the original file system:

Copy to Clipboard Toggle word wrap

umount /dev/stratis/my-pool/my-fs
stratis filesystem destroy my-pool my-fs

# umount /dev/stratis/my-pool/my-fs
# stratis filesystem destroy my-pool my-fs

Create a copy of the snapshot under the name of the original file system:
Copy to Clipboard Copied! Toggle word wrap Toggle overflow
```
stratis filesystem snapshot my-pool my-fs-snapshot my-fs
```
```
# stratis filesystem snapshot my-pool my-fs-snapshot my-fs
```
Mount the snapshot, which is now accessible with the same name as the original file system:
Copy to Clipboard Copied! Toggle word wrap Toggle overflow
```
mount /dev/stratis/my-pool/my-fs mount-point
```
```
# mount /dev/stratis/my-pool/my-fs mount-point
```

The content of the file system named my-fs is now identical to the snapshot my-fs-snapshot.

Additional resources

stratis(8) man page on your system

27.5. Removing a Stratis snapshot

You can remove a Stratis snapshot from a pool. Data on the snapshot are lost.

Prerequisites

Stratis is installed and the stratisd service is running. For more information,see Installing Stratis.
You have created a Stratis snapshot. For more information, see Creating a Stratis snapshot.

Procedure

Unmount the snapshot:

Copy to Clipboard Toggle word wrap

umount /dev/stratis/my-pool/my-fs-snapshot

# umount /dev/stratis/my-pool/my-fs-snapshot

Destroy the snapshot:

Copy to Clipboard Toggle word wrap

stratis filesystem destroy my-pool my-fs-snapshot

# stratis filesystem destroy my-pool my-fs-snapshot

Additional resources

stratis(8) man page on your system

Chapter 27. Using snapshots on Stratis file systems

27.1. Characteristics of Stratis snapshots

27.2. Creating a Stratis snapshot

27.3. Accessing the content of a Stratis snapshot

27.4. Reverting a Stratis file system to a previous snapshot

27.5. Removing a Stratis snapshot

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