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Ceph RADOS Block Devices (RBD)

Storage pool type: rbd

Ceph is a distributed object store and file system designed to provide excellent performance, reliability and scalability. RADOS block devices implement a feature rich block level storage, and you get the following advantages:

  • thin provisioning

  • resizable volumes

  • distributed and redundant (striped over multiple OSDs)

  • full snapshot and clone capabilities

  • self healing

  • no single point of failure

  • scalable to the exabyte level

  • kernel and user space implementation available

Note
 For smaller deployments, it is also possible to run Ceph services directly on your {pve} nodes. Recent hardware has plenty of CPU power and RAM, so running storage services and VMs on same node is possible.

Configuration

This backend supports the common storage properties nodes, disable, content, and the following rbd specific properties:

monhost

List of monitor daemon IPs. Optional, only needed if Ceph is not running on the PVE cluster.

pool

Ceph pool name.

username

RBD user Id. Optional, only needed if Ceph is not running on the PVE cluster.

krbd

Enforce access to rados block devices through the krbd kernel module. Optional.

Note
 Containers will use krbd independent of the option value.
Configuration Example for a external Ceph cluster (/etc/pve/storage.cfg)
rbd: ceph-external
        monhost 10.1.1.20 10.1.1.21 10.1.1.22
        pool ceph-external
        content images
        username admin
Tip
 You can use the rbd utility to do low-level management tasks.

Authentication

If you use cephx authentication, you need to copy the keyfile from your external Ceph cluster to a Proxmox VE host.

Create the directory /etc/pve/priv/ceph with

mkdir /etc/pve/priv/ceph

Then copy the keyring

scp <cephserver>:/etc/ceph/ceph.client.admin.keyring /etc/pve/priv/ceph/<STORAGE_ID>.keyring

The keyring must be named to match your <STORAGE_ID>. Copying the keyring generally requires root privileges.

If Ceph is installed locally on the PVE cluster, this is done automatically by 'pveceph' or in the GUI.

Storage Features

The rbd backend is a block level storage, and implements full snapshot and clone functionality.

Table 1. Storage features for backend rbd
Content types Image formats Shared Snapshots Clones

images rootdir

raw

yes

yes

yes