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https://github.com/ceph/ceph
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60 lines
1.5 KiB
ReStructuredText
60 lines
1.5 KiB
ReStructuredText
==========================
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Kernel Module Operations
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==========================
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.. index:: Ceph Block Device; kernel module
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.. important:: To use kernel module operations, you must have a running Ceph cluster.
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Get a List of Images
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====================
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To mount a block device image, first return a list of the images. ::
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rbd list
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Map a Block Device
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==================
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Use ``rbd`` to map an image name to a kernel module. You must specify the
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image name, the pool name, and the user name. ``rbd`` will load RBD kernel
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module on your behalf if it's not already loaded. ::
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sudo rbd map {pool-name}/{image-name} --id {user-name}
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For example::
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sudo rbd map rbd/myimage --id admin
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If you use `cephx`_ authentication, you must also specify a secret. It may come
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from a keyring or a file containing the secret. ::
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sudo rbd map rbd/myimage --id admin --keyring /path/to/keyring
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sudo rbd map rbd/myimage --id admin --keyfile /path/to/file
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Show Mapped Block Devices
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=========================
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To show block device images mapped to kernel modules with the ``rbd`` command,
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specify the ``showmapped`` option. ::
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rbd showmapped
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Unmapping a Block Device
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========================
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To unmap a block device image with the ``rbd`` command, specify the ``unmap``
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option and the device name (i.e., by convention the same as the block device
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image name). ::
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sudo rbd unmap /dev/rbd/{poolname}/{imagename}
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For example::
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sudo rbd unmap /dev/rbd/rbd/foo
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.. _cephx: ../../rados/operations/user-management/
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