pve-storage-rbd.adoc

   1 Ceph RADOS Block Devices (RBD)
   2 ------------------------------
   3 include::attributes.txt[]
   4 ifdef::wiki[]
   5 :pve-toplevel:
   6 :title: Storage: RBD
   7 endif::wiki[]
   8
   9 Storage pool type: `rbd`
  10
  11 http://ceph.com[Ceph] is a distributed object store and file system
  12 designed to provide excellent performance, reliability and
  13 scalability. RADOS block devices implement a feature rich block level
  14 storage, and you get the following advantages:
  15
  16 * thin provisioning
  17 * resizable volumes
  18 * distributed and redundant (striped over multiple OSDs)
  19 * full snapshot and clone capabilities
  20 * self healing
  21 * no single point of failure
  22 * scalable to the exabyte level
  23 * kernel and user space implementation available
  24
  25 NOTE: For smaller deployments, it is also possible to run Ceph
  26 services directly on your {pve} nodes. Recent hardware has plenty
  27 of CPU power and RAM, so running storage services and VMs on same node
  28 is possible.
  29
  30 Configuration
  31 ~~~~~~~~~~~~~
  32
  33 This backend supports the common storage properties `nodes`,
  34 `disable`, `content`, and the following `rbd` specific properties:
  35
  36 monhost::
  37
  38 List of monitor daemon IPs.
  39
  40 pool::
  41
  42 Ceph pool name.
  43
  44 username::
  45
  46 RBD user Id.
  47
  48 krbd::
  49
  50 Access rbd through krbd kernel module. This is required if you want to
  51 use the storage for containers.
  52
  53 .Configuration Example (`/etc/pve/storage.cfg`)
  54 ----
  55 rbd: ceph3
  56         monhost 10.1.1.20 10.1.1.21 10.1.1.22
  57         pool ceph3
  58         content images
  59         username admin
  60 ----
  61
  62 TIP: You can use the `rbd` utility to do low-level management tasks.
  63
  64 Authentication
  65 ~~~~~~~~~~~~~~
  66
  67 If you use `cephx` authentication, you need to copy the keyfile from
  68 Ceph to Proxmox VE host.
  69
  70 Create the directory `/etc/pve/priv/ceph` with
  71
  72  mkdir /etc/pve/priv/ceph
  73
  74 Then copy the keyring
  75
  76  scp <cephserver>:/etc/ceph/ceph.client.admin.keyring /etc/pve/priv/ceph/<STORAGE_ID>.keyring
  77
  78 The keyring must be named to match your `<STORAGE_ID>`. Copying the
  79 keyring generally requires root privileges.
  80
  81 Storage Features
  82 ~~~~~~~~~~~~~~~~
  83
  84 The `rbd` backend is a block level storage, and implements full
  85 snapshot and clone functionality.
  86
  87 .Storage features for backend `rbd`
  88 [width="100%",cols="m,m,3*d",options="header"]
  89 |==============================================================================
  90 |Content types  |Image formats  |Shared |Snapshots |Clones
  91 |images rootdir |raw            |yes    |yes       |yes
  92 |==============================================================================
  93
  94 ifdef::wiki[]
  95
  96 See Also
  97 ~~~~~~~~
  98
  99 * link:/wiki/Storage[Storage]
 100
 101 endif::wiki[]
 102