NAME

       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] [--notrim] [--encryption-format format] [--encryption-passphrase-file passphrase-file] [--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 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: 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.

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 https://docs.ceph.com/ for more information.

SEE ALSO

       rbd(8)

COPYRIGHT

       2010-2022,  Inktank  Storage,  Inc.  and  contributors.  Licensed  under  Creative Commons
       Attribution Share Alike 3.0 (CC-BY-SA-3.0)