rbd-nbd – map rbd images to nbd device
Synopsis
rbd-nbd [-c conf] [–read-only] [–device nbd device] [–nbds_max limit] [–max_part limit] [–exclusive] [–io-timeout seconds] [–reattach-timeout seconds] map image-spec | snap-spec
rbd-nbd unmap nbd device | image-spec | snap-spec
rbd-nbd list-mapped
rbd-nbd attach –device nbd device image-spec | snap-spec
rbd-nbd detach nbd device | image-spec | snap-spec
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 of NBD kernel module when modprobe, used to limit the count of nbd device.
--max_part
*limit*
Override for module param nbds_max.
--exclusive
Forbid writes by other clients.
--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.
Image and snap specs
image-spec is [pool-name]/image-name
snap-spec is [pool-name]/image-name@snap-name
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 http://ceph.com/docs for more information.
See also
rbd(8)