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A snapshot is a copy of the file system and data on the volume at a certain point in time. A snapshot is a reference for creating new volumes and can be used as a backup copy or to distribute operating systems and software.
Creating a snapshot#
A snapshot can be created using several methods:
from any volume, which is available or attached to the instance;
from an object loaded into bucket;
automatically when creating an image from an instance.
Creating a snapshot does not impact read/write operations – volumes can be attached, detached, or deleted without waiting for the snapshot to be created.
For all company projects and users, you can simultaneously create a maximum of 16 volume snapshots.
Creating a snapshot from a volume#
Select a volume in the Volumes subsection and click Create snapshot. For convenience, specify the snapshot description and click Create.
You can also create a snapshot on the instance page. Go to the Volumes tab, select the volume and click Create snapshot. Specify the snapshot description and click Create.
A volume snapshot is created immediately, but you can create another snapshot of the same volume only after it is transferred to a storage of snapshots.
You can take a snapshot of a volume even it is attached to a running instance. However, this can result in an inconsistent snapshot.
Read/write operations inside the instance are not blocked, and the RAM may contain cached file system data that has not yet been written to the volume at the time when the snapshot is created. It is important to note that a volume snapshot will only contain data that is present on the volume.
To ensure snapshot consistency, you can stop the instance or flush the cache, pause writing to the respective volume, and run the command to create a volume snapshot.
Creating a snapshot from an object#
Creating snapshots along with an image#
When an image is created from an instance, snapshots of all volumes attached to the instance are automatically created.
A snapshot is private by default and available only within the project in which it was created. If necessary, you can grant other projects the access to the snapshot. To set access rules:
Go to the Snapshots section and select the desired snapshot in the resource table.
Click Set access.
In the dialog window, add project(s) that are to be granted access.
You can change snapshot access settings at any time:
Go to the Snapshots section, select the desired snapshot in the resource table and click its ID to go to the snapshot page.
In the Information tab, click the editing icon for the Common access parameter.
In the dialog window, add or remove projects.
You can use both procedures for initial access setting, as well for access editing.
It is strongly recommended to avoid distributing snapshots with a preset system administrator password. A random password can be generated at the system launch and displayed to a user via a remote console.
Before 02.08.2022, public access to the snapshots could be granted to all authorized NGN Cloud users. If you have public snapshots, you can make them private by clearing the respective checkbox when setting the access to the image. This operation is irreversible: you cannot make the image public again.
Deleting a snapshot#
You can delete your own snapshot if you no longer need it. To delete the snapshot, click Delete.
Deleting a snapshot does not impacts volumes created from it.
To delete snapshots that were created together with an image, delete the image.
Click the unique snapshot ID link to go to the page with detailed snapshot information.
The Information tab contains a description of the snapshot, status, project, creation date, size, and access details. Here, you can change the description and configure access to the volume snapshot.