Adding upstream version 14.2.21.upstream/14.2.21upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 59 insertions, 0 deletions

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