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133 lines
4.1 KiB
Groff
133 lines
4.1 KiB
Groff
.TH RBD 8
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.SH NAME
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rbd \- manage rados block device (RBD) images
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.SH SYNOPSIS
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.B rbd
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[ \fB\-c\fI ceph.conf\fR ]
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[ \fB\-m\fI monaddr\fR ]
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[ \fB\-p\fP | \fB\-\-pool\fI pool\fR ]
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[ \fB\-\-size\fI size\fR ]
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[ \fB\-\-order\fI bits\fR ]
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[ \fIcommand ...\fR ]
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.SH DESCRIPTION
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.B rbd
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is a utility for manipulating rados block device (RBD) images, used by the Linux
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rbd driver and the rbd storage driver for Qemu/KVM. RBD images are
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simple block devices that are striped over objects and stored in a RADOS object store.
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The size of the objects the image is striped over must be a power of two.
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.SH OPTIONS
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.TP
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\fB\-c\fI ceph.conf\fR, \fB\-\-conf \fIceph.conf\fR
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Use \fIceph.conf\fP configuration file instead of the default \fI/etc/ceph/ceph.conf\fP
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to determine monitor addresses during startup.
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.TP
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\fB\-m\fI monaddress[:port]\fR
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Connect to specified monitor (instead of looking through \fIceph.conf\fR).
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.TP
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\fB\-p\fI pool\fR, \fB\-\-pool \fIpool\fR
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Interact with the given \fIpool\fP. Required by most commands.
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.SH PARAMETERS
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.TP
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\fB\-\-size \fIsize-in-mb\fP
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Specifies the size (in megabytes) of the new rbd image.
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.TP
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\fB\-\-order \fIbits\fP
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Specifies the object size expressed as a number of bits, such that the object size is 1 << \fIorder\fR. The default is 22 (4 MB).
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.TP
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\fB\-\-snap \fIsnap\fP
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Specifies the snapshot name for the specific operation.
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.TP
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\fB\-\-user \fIusername\fP
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Specifies the username to use with the map command.
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.TP
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\fB\-\-secret \fIfilename\fP
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Specifies a file containing the secret to use with the map command.
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.SH COMMANDS
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.TP
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\fBls \fR[ \fIpool-name\fP ]
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Will list all rbd images listed in the \fIrbd_directory\fR object.
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.TP
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\fBinfo \fR[ \fIimage-name\fP ]
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Will dump information (such as size and order) about a specific rbd image.
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.TP
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\fBcreate \fR[ \fIimage-name\fP ]
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Will create a new rbd image. You must also specify the size via \fB\-\-size\fR.
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.TP
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\fBresize \fR[ \fIimage-name\fP ]
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Resizes rbd image. The size parameter also needs to be specified.
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.TP
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\fBrm \fR[ \fIimage-name\fP ]
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Deletes rbd image (including all data blocks)
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.TP
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\fBexport \fR[ \fIimage-name\fP ] \fR[ \fIdest-path\fP ]
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Exports image to dest path.
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.TP
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\fBimport \fR[ \fIpath\fP ] \fR[ \fIdest-image\fP ]
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Creates a new image and imports its data from path.
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.TP
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\fBcp \fR[ \fIsrc-image\fP ] \fR[ \fIdest-image\fP ]
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Copies the content of a src-image into the newly created dest-image.
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.TP
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\fBmv \fR[ \fIsrc-image\fP ] \fR[ \fIdest-image\fP ]
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Renames an image.
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.TP
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\fBsnap ls \fR[ \fIimage-name\fP ]
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Dumps the list of snapshots inside a specific image.
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.TP
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\fBsnap create \fR[ \fIimage-name\fP ]
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Creates a new snapshot. Requires the snapshot name parameter specified.
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.TP
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\fBsnap rollback \fR[ \fIimage-name\fP ]
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Rollback image content to snapshot. This will iterate through the entire blocks array and update the data head content to the snapshotted version.
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.TP
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\fBsnap rm \fR[ \fIimage-name\fP ]
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Removes the specified snapshot.
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.TP
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\fBmap \fR[ \fIimage-name\fP ]
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Maps the specified image to a block device via the rbd kernel module.
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.TP
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\fBunmap \fR[ \fIdevice-path\fP ]
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Unmaps the block device that was mapped via the rbd kernel module.
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.SH IMAGE NAME
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In addition to using the \fB\-\-pool\fR and the \fB\-\-snap\fR options, the image name can include both the pool name and the snapshot name. The image name format is as follows:
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.IP
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[\fIpool\fP/]image-name[@\fIsnap\fP]
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.PP
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Thus an image name that contains a slash character ('/') requires specifying the pool name explicitly.
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.SH EXAMPLES
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To create a new rbd image that is 100 GB:
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.IP
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rbd -p mypool create myimage --size 102400
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.PP
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or alternatively
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.IP
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rbd create mypool/myimage --size 102400
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.PP
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To use a non-default object size (8 MB):
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.IP
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rbd create mypool/myimage --size 102400 --order 23
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.PP
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To delete an rbd image (be careful!):
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.IP
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rbd rm mypool/myimage
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.PP
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To create a new snapshot:
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.IP
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rbd create mypool/myimage@mysnap
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.PP
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To map an image via the kernel with cephx enabled:
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.IP
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rbd map myimage --user admin --secret secretfile
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.PP
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To unmap an image:
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.IP
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rbd unmap /dev/rbd0
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.PP
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.SH AVAILABILITY
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.B rbd
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is part of the Ceph distributed file system. Please refer to the Ceph wiki at
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http://ceph.newdream.net/wiki for more information.
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.SH SEE ALSO
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.BR ceph (8), rados (8)
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