docker-fsfreeze

The fsfreeze⁠ command is used to suspend and resume access to a file system. This allows consistent snapshots to be taken by halting any new write system calls while allowing ongoing transactions to complete.

Supported filesystems:

• Ext3
• Ext4
• ReiserFS
• JFS
• XFS

Note: fsfreeze is unnecessary for device-mapper devices. The device-mapper (and LVM) automatically freezes filesystem on the device when a snapshot creation is requested.