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rbd: manage rados block device (RBD) images


rbd - manage rados block device (rbd) images


rbd [ -c ceph.conf ] [ -m monaddr ] [ -p | --pool pool ] [ --size size ] [ --order bits ] [ command ... ]
rbd is a utility for manipulating rados block device (RBD) images, used by the Linux rbd driver and the rbd storage driver for Qemu/KVM. RBD images are simple block devices that are striped over objects and stored in a RADOS object store. The size of the objects the image is striped over must be a power of two.
-c ceph.conf, --conf ceph.conf Use ceph.conf configuration file instead of the default /etc/ceph/ceph.conf to determine monitor addresses during startup. -m monaddress[:port] Connect to specified monitor (instead of looking through ceph.conf). -p pool, --pool pool Interact with the given pool. Required by most commands.


--size size-in-mb Specifies the size (in megabytes) of the new rbd image. --order bits Specifies the object size expressed as a number of bits, such that the object size is 1 << order. The default is 22 (4 MB). --snap snap Specifies the snapshot name for the specific operation.


ls [ pool-name ] Will list all rbd images listed in the rbd_directory object. info [ image-name ] Will dump information (such as size and order) about a specific rbd image. create [ image-name ] Will create a new rbd image. You must also specify the size via --size. resize [ image-name ] Resizes rbd image. The size parameter also needs to be specified. rm [ image-name ] Deletes rbd image (including all data blocks) rm [ image-name ] Deletes rbd image (including all data blocks) export [ image-name ] [ dest-path ] Exports image to dest path. import [ path ] [ dest-image ] Creates a new image and imports its data from path. cp [ src-image ] [ dest-image ] Copies the content of a src-image into the newly created dest- image. mv [ src-image ] [ dest-image ] Renames an image. snap ls [ image-name ] Dumps the list of snapshots inside a specific image. snap create [ image-name ] Creates a new snapshot. Requires the snapshot name parameter specified. snap rollback [ image-name ] Rollback image content to snapshot. This will iterate through the entire blocks array and update the data head content to the snapshotted version. snap rm [ image-name ] Removes the specified snapshot.


In addition to using the --pool and the --snap options, the image name can include both the pool name and the snapshot name. The image name format is as follows: [pool/]image-name[@snap] Thus an image name that contains a slash character ('/') requires specifying the pool name explicitly.


To create a new rbd image that is 100 GB: rbd -p mypool create myimage --size 102400 or alternatively rbd create mypool/myimage --size 102400 To use a non-default object size (8 MB): rbd create mypool/myimage --size 102400 --order 23 To delete an rbd image (be careful!): rbd rm mypool/myimage To create a new snapshot: rbd create mypool/myimage@mysnap
rbd is part of the Ceph distributed file system. Please refer to the Ceph wiki at //ceph.newdream.net/wiki for more information.
ceph(8),rados(8) RBDTOOL(8) RBD(8)

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