ceph/man/rbd.8

.TH "RBD" "8" "September 09, 2011" "dev" "Ceph"
.SH NAME
rbd \- manage rados block device (RBD) images
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.SH SYNOPSIS
.nf
\fBrbd\fP [ \-c \fIceph.conf\fP ] [ \-m \fImonaddr\fP ] [ \-p | \-\-pool \fIpool\fP ] [
\-\-size \fIsize\fP ] [ \-\-order \fIbits\fP ] [ \fIcommand\fP ... ]
.fi
.sp
.SH DESCRIPTION
.sp
\fBrbd\fP 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.
.SH OPTIONS
.INDENT 0.0
.TP
.B \-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.
.UNINDENT
.INDENT 0.0
.TP
.B \-m monaddress[:port]
Connect to specified monitor (instead of looking through ceph.conf).
.UNINDENT
.INDENT 0.0
.TP
.B \-p pool, \-\-pool pool
Interact with the given pool. Required by most commands.
.UNINDENT
.SH PARAMETERS
.INDENT 0.0
.TP
.B \-\-size size\-in\-mb
Specifies the size (in megabytes) of the new rbd image.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-order bits
Specifies the object size expressed as a number of bits, such that
the object size is \fB1 << order\fP. The default is 22 (4 MB).
.UNINDENT
.INDENT 0.0
.TP
.B \-\-snap snap
Specifies the snapshot name for the specific operation.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-user username
Specifies the username to use with the map command.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-secret filename
Specifies a file containing the secret to use with the map command.
.UNINDENT
.SH COMMANDS
.INDENT 0.0
.TP
.B \fBls\fP [\fIpool\-name\fP]
Will list all rbd images listed in the rbd_directory object.
.TP
.B \fBinfo\fP [\fIimage\-name\fP]
Will dump information (such as size and order) about a specific rbd image.
.TP
.B \fBcreate\fP [\fIimage\-name\fP]
Will create a new rbd image. You must also specify the size via \-\-size.
.TP
.B \fBresize\fP [\fIimage\-name\fP]
Resizes rbd image. The size parameter also needs to be specified.
.TP
.B \fBrm\fP [\fIimage\-name\fP]
Deletes rbd image (including all data blocks)
.TP
.B \fBexport\fP [\fIimage\-name\fP] [\fIdest\-path\fP]
Exports image to dest path.
.TP
.B \fBimport\fP [\fIpath\fP] [\fIdest\-image\fP]
Creates a new image and imports its data from path.
.TP
.B \fBcp\fP [\fIsrc\-image\fP] [\fIdest\-image\fP]
Copies the content of a src\-image into the newly created dest\-image.
.TP
.B \fBmv\fP [\fIsrc\-image\fP] [\fIdest\-image\fP]
Renames an image.
.TP
.B \fBsnap\fP ls [\fIimage\-name\fP]
Dumps the list of snapshots inside a specific image.
.TP
.B \fBsnap\fP create [\fIimage\-name\fP]
Creates a new snapshot. Requires the snapshot name parameter specified.
.TP
.B \fBsnap\fP rollback [\fIimage\-name\fP]
Rollback image content to snapshot. This will iterate through the entire blocks
array and update the data head content to the snapshotted version.
.TP
.B \fBsnap\fP rm [\fIimage\-name\fP]
Removes the specified snapshot.
.TP
.B \fBmap\fP [\fIimage\-name\fP]
Maps the specified image to a block device via the rbd kernel module.
.TP
.B \fBunmap\fP [\fIdevice\-path\fP]
Unmaps the block device that was mapped via the rbd kernel module.
.UNINDENT
.SH IMAGE NAME
.sp
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:
.sp
.nf
.ft C
[pool/]image\-name[@snap]
.ft P
.fi
.sp
Thus an image name that contains a slash character (\(aq/\(aq) requires specifying the pool
name explicitly.
.SH EXAMPLES
.sp
To create a new rbd image that is 100 GB:
.sp
.nf
.ft C
rbd \-p mypool create myimage \-\-size 102400
.ft P
.fi
.sp
or alternatively:
.sp
.nf
.ft C
rbd create mypool/myimage \-\-size 102400
.ft P
.fi
.sp
To use a non\-default object size (8 MB):
.sp
.nf
.ft C
rbd create mypool/myimage \-\-size 102400 \-\-order 23
.ft P
.fi
.sp
To delete an rbd image (be careful!):
.sp
.nf
.ft C
rbd rm mypool/myimage
.ft P
.fi
.sp
To create a new snapshot:
.sp
.nf
.ft C
rbd create mypool/myimage@mysnap
.ft P
.fi
.sp
To map an image via the kernel with cephx enabled:
.sp
.nf
.ft C
rbd map myimage \-\-user admin \-\-secret secretfile
.ft P
.fi
.sp
To unmap an image:
.sp
.nf
.ft C
rbd unmap /dev/rbd0
.ft P
.fi
.SH AVAILABILITY
.sp
\fBrbd\fP is part of the Ceph distributed file system. Please refer to
the Ceph wiki at \fI\%http://ceph.newdream.net/wiki\fP for more information.
.SH SEE ALSO
.sp
\fBceph\fP(8),
\fBrados\fP(8)
.SH COPYRIGHT
2011, New Dream Network
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