rbd-nbd -- map rbd images to nbd device
Synopsis
Description
rbd-nbd is a client for RADOS block device (rbd) images like rbd kernel module. It will map a rbd image to a nbd (Network Block Device) device, allowing access it as regular local block device.
Options
- -c ceph.conf
Use ceph.conf configuration file instead of the default
/etc/ceph/ceph.conf
to determine monitor addresses during startup.
- --read-only
Map read-only.
- --nbds_max *limit*
Override the parameter nbds_max of NBD kernel module when modprobe, used to limit the count of nbd device.
- --max_part *limit*
Override for module param max_part.
- --exclusive
Forbid writes by other clients.
- --notrim
Turn off trim/discard.
- --encryption-format
Image encryption format. Possible values: luks, luks1, luks2
- --encryption-passphrase-file
Path of file containing a passphrase for unlocking image encryption.
- --io-timeout *seconds*
Override device timeout. Linux kernel will default to a 30 second request timeout. Allow the user to optionally specify an alternate timeout.
- --reattach-timeout *seconds*
Specify timeout for the kernel to wait for a new rbd-nbd process is attached after the old process is detached. The default is 30 second.
- --snap-id *snapid*
Specify a snapshot to map/unmap/attach/detach by ID instead of by name.
Image and snap specs
The default for pool-name is “rbd”. If an image name contains a slash character (‘/’), pool-name is required.
Availability
rbd-nbd is part of Ceph, a massively scalable, open-source, distributed storage system. Please refer to the Ceph documentation at https://docs.ceph.com/ for more information.
See also
rbd(8)