note:Ensure your Ceph Storage Cluster is in an active + clean statebefore working with the Ceph Block Device.

The Ceph Block Device is also known as RBD or RADOSBlock Device.

You may use a virtual machine for your ceph-client node, but do notexecute the following procedures on the same physical node as your CephStorage Cluster nodes (unless you use a VM). See FAQ for details.


2.1 在ceph集群上创建

On the admin node, use the ceph tool to create a pool(we recommend the name ‘rbd’).

ceph osd pool create one

On the admin node, use the rbd tool to initialize the pool for use by RBD:

rbd pool init name


On the ceph-client node, create a block device image.

rbd create foo --size 4096 --image-feature layering [-m {mon-IP}] [-k /path/to/ceph.client.admin.keyring] [-p {pool-name}]

On the ceph-client node, map the image to a block device.

sudo rbd map foo --name client.admin [-m {mon-IP}] [-k /path/to/ceph.client.admin.keyring] [-p {pool-name}]

Use the block device by creating a file system on the ceph-clientnode.

sudo mkfs.ext4 -m0 /dev/rbd/{pool-name}/foo

Mount the file system on the ceph-client node.

sudo mkdir /mnt/ceph-block-device
sudo mount /dev/rbd/{pool-name}/foo /mnt/ceph-block-device
cd /mnt/ceph-block-device

Optionally configure the block device to be automatically mapped and mountedat boot (and unmounted/unmapped at shutdown) – see the rbdmap manpage.


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