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https://github.com/ceph/ceph
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649bdc15d3
* a clone's size can't be overridden * note which commands require format 2 * clarify details of copy * add examples for cloning * add pool to map example for consistency * fix a couple warnings and re-sync man page with rst Signed-off-by: Josh Durgin <josh.durgin@inktank.com>
338 lines
8.8 KiB
Groff
338 lines
8.8 KiB
Groff
.TH "RBD" "8" "August 29, 2012" "dev" "Ceph"
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.SH NAME
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rbd \- manage rados block device (RBD) images
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.
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..
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.\" Man page generated from reStructuredText.
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.
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.SH SYNOPSIS
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.nf
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\fBrbd\fP [ \-c \fIceph.conf\fP ] [ \-m \fImonaddr\fP ] [ \-p | \-\-pool \fIpool\fP ] [
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\-\-size \fIsize\fP ] [ \-\-order \fIbits\fP ] [ \fIcommand\fP ... ]
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.fi
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.sp
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.SH DESCRIPTION
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.sp
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\fBrbd\fP is a utility for manipulating rados block device (RBD) images,
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used by the Linux rbd driver and the rbd storage driver for Qemu/KVM.
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RBD images are simple block devices that are striped over objects and
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stored in a RADOS object store. The size of the objects the image is
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striped over must be a power of two.
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.SH OPTIONS
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.INDENT 0.0
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.TP
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.B \-c ceph.conf, \-\-conf ceph.conf
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Use ceph.conf configuration file instead of the default /etc/ceph/ceph.conf to
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determine monitor addresses during startup.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-m monaddress[:port]
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Connect to specified monitor (instead of looking through ceph.conf).
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-p pool, \-\-pool pool
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Interact with the given pool. Required by most commands.
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.UNINDENT
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.SH PARAMETERS
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.INDENT 0.0
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.TP
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.B \-\-format format
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Specifies which object layout to use. The default is 1.
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.INDENT 7.0
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.IP \(bu 2
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format 1 \- Use the original format for a new rbd image. This format is
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understood by all versions of librbd and the kernel rbd module, but
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does not support newer features like cloning.
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.IP \(bu 2
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format 2 \- Use the second rbd format, which is supported by
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librbd (but not the kernel rbd module) at this time. This adds
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support for cloning and is more easily extensible to allow more
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features in the future.
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.UNINDENT
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-\-size size\-in\-mb
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Specifies the size (in megabytes) of the new rbd image.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-\-order bits
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Specifies the object size expressed as a number of bits, such that
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the object size is \fB1 << order\fP. The default is 22 (4 MB).
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-\-snap snap
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Specifies the snapshot name for the specific operation.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-\-id username
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Specifies the username (without the \fBclient.\fP prefix) to use with the map command.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-\-keyfile filename
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Specifies a file containing the secret to use with the map command.
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If not specified, \fBclient.admin\fP will be used by default.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-\-keyring filename
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Specifies a keyring file containing a secret for the specified user
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to use with the map command. If not specified, the default keyring
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locations will be searched.
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.UNINDENT
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.SH COMMANDS
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.INDENT 0.0
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.TP
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.B \fBls\fP [\fIpool\-name\fP]
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Will list all rbd images listed in the rbd_directory object.
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.TP
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.B \fBinfo\fP [\fIimage\-name\fP]
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Will dump information (such as size and order) about a specific rbd image.
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If image is a clone, information about its parent is also displayed.
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If a snapshot is specified, whether it is protected is shown as well.
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.TP
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.B \fBcreate\fP [\fIimage\-name\fP]
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Will create a new rbd image. You must also specify the size via \-\-size.
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.TP
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.B \fBclone\fP [\fIparent\-snapname\fP] [\fIimage\-name\fP]
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Will create a clone (copy\-on\-write child) of the parent snapshot.
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Object order will be identical to that of the parent image unless
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specified. Size will be the same as the parent snapshot.
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.sp
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The parent snapshot must be protected (see \fIrbd snap protect\fP).
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This requires format 2.
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.TP
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.B \fBflatten\fP [\fIimage\-name\fP]
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If image is a clone, copy all shared blocks from the parent snapshot and
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make the child independent of the parent, severing the link between
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parent snap and child. The parent snapshot can be unprotected and
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deleted if it has no further dependent clones.
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.sp
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This requires format 2.
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.TP
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.B \fBchildren\fP [\fIimage\-name\fP]
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List the clones of the image at the given snapshot. This checks
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every pool, and outputs the resulting poolname/imagename.
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.sp
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This requires format 2.
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.TP
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.B \fBresize\fP [\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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.B \fBrm\fP [\fIimage\-name\fP]
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Deletes an rbd image (including all data blocks). If the image has
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snapshots, this fails and nothing is deleted.
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.TP
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.B \fBexport\fP [\fIimage\-name\fP] [\fIdest\-path\fP]
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Exports image to dest path.
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.TP
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.B \fBimport\fP [\fIpath\fP] [\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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.B \fBcp\fP [\fIsrc\-image\fP] [\fIdest\-image\fP]
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Copies the content of a src\-image into the newly created dest\-image.
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dest\-image will have the same size, order, and format as src\-image.
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.TP
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.B \fBmv\fP [\fIsrc\-image\fP] [\fIdest\-image\fP]
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Renames an image. Note: rename across pools is not supported.
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.TP
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.B \fBsnap\fP ls [\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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.B \fBsnap\fP create [\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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.B \fBsnap\fP rollback [\fIimage\-name\fP]
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Rollback image content to snapshot. This will iterate through the entire blocks
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array and update the data head content to the snapshotted version.
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.TP
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.B \fBsnap\fP rm [\fIimage\-name\fP]
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Removes the specified snapshot.
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.TP
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.B \fBsnap\fP purge [\fIimage\-name\fP]
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Removes all snapshots from an image.
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.TP
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.B \fBsnap\fP protect [\fIimage\-name\fP]
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Protect a snapshot from deletion, so that clones can be made of it
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(see \fIrbd clone\fP). Snapshots must be protected before clones are made;
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protection implies that there exist dependent cloned children that
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refer to this snapshot. \fIrbd clone\fP will fail on a nonprotected
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snapshot.
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.sp
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This requires format 2.
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.TP
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.B \fBsnap\fP unprotect [\fIimage\-name\fP]
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Unprotect a snapshot from deletion (undo \fIsnap protect\fP). If cloned
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children remain, \fIsnap unprotect\fP fails. (Note that clones may exist
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in different pools than the parent snapshot.)
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.sp
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This requires format 2.
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.TP
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.B \fBmap\fP [\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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.B \fBunmap\fP [\fIdevice\-path\fP]
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Unmaps the block device that was mapped via the rbd kernel module.
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.TP
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.B \fBshowmapped\fP
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Show the rbd images that are mapped via the rbd kernel module.
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.UNINDENT
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.SH IMAGE NAME
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.sp
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In addition to using the \-\-pool and the \-\-snap options, the image name can include both
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the pool name and the snapshot name. The image name format is as follows:
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.sp
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.nf
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.ft C
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[pool/]image\-name[@snap]
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.ft P
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.fi
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.sp
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Thus an image name that contains a slash character (\(aq/\(aq) requires specifying the pool
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name explicitly.
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.SH EXAMPLES
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.sp
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To create a new rbd image that is 100 GB:
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.sp
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.nf
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.ft C
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rbd \-p mypool create myimage \-\-size 102400
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.ft P
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.fi
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.sp
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or alternatively:
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.sp
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.nf
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.ft C
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rbd create mypool/myimage \-\-size 102400
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.ft P
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.fi
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.sp
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To use a non\-default object size (8 MB):
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.sp
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.nf
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.ft C
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rbd create mypool/myimage \-\-size 102400 \-\-order 23
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.ft P
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.fi
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.sp
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To delete an rbd image (be careful!):
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.sp
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.nf
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.ft C
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rbd rm mypool/myimage
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.ft P
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.fi
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.sp
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To create a new snapshot:
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.sp
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.nf
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.ft C
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rbd snap create mypool/myimage@mysnap
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.ft P
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.fi
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.sp
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To create a copy\-on\-write clone of a protected snapshot:
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.sp
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.nf
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.ft C
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rbd clone mypool/myimage@mysnap otherpool/cloneimage
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.ft P
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.fi
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.sp
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To see which clones of a snapshot exist:
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.sp
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.nf
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.ft C
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rbd children mypool/myimage@mysnap
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.ft P
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.fi
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.sp
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To delete a snapshot:
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.sp
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.nf
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.ft C
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rbd snap rm mypool/myimage@mysnap
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.ft P
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.fi
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.sp
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To map an image via the kernel with cephx enabled:
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.sp
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.nf
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.ft C
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rbd map mypool/myimage \-\-id admin \-\-keyfile secretfile
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.ft P
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.fi
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.sp
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To unmap an image:
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.sp
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.nf
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.ft C
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rbd unmap /dev/rbd0
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.ft P
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.fi
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.sp
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To create an image and a clone from it:
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.sp
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.nf
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.ft C
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rbd import \-\-format 2 image mypool/parent
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rbd snap create \-\-snap snapname mypool/parent
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rbd snap protect mypool/parent@snap
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rbd clone mypool/parent@snap otherpool/child
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.ft P
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.fi
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.sp
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To change an image from one format to another, export it and then
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import it as the desired format:
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.sp
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.nf
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.ft C
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rbd export mypool/myimage@snap /tmp/img
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rbd import \-\-format 2 /tmp/img mypool/myimage2
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.ft P
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.fi
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.SH AVAILABILITY
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.sp
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\fBrbd\fP is part of the Ceph distributed file system. Please refer to
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the Ceph documentation at \fI\%http://ceph.com/docs\fP for more information.
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.SH SEE ALSO
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.sp
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\fBceph\fP(8),
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\fBrados\fP(8)
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.SH COPYRIGHT
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2012, Inktank Storage, Inc.
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.\" Generated by docutils manpage writer.
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.
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