Thursday, December 5, 2013

Ceph + OpenStack :: Part-1


Ceph & OpenStack Integration

We can use Ceph Block Device with openstack through libvirt, which configures the QEMU interface tolibrbd. To use Ceph Block Devices with openstack , we must install QEMU, libvirt, and openstack  first. ( we will not cover openstack installation in this document , you can use your existing openstack infrastructure ) The following diagram explains openstack  /Ceph technology stack.
OpenStack/Ceph technology stack

Installing QEMU


qemu-img version 0.12.1 does not have RBD support , so we need install packages with async . On Openstack Node , create 3 YUM repo files ceph-extras-source.repo , ceph-extras.repo, ceph-extras-noarch.repo
  [ceph-extras]
  name=Ceph Extra Packages and Backports $basearch
  baseurl=http://ceph.com/packages/ceph-extras/rpm/centos6/$basearch
  enabled=1
  gpgcheck=1
  type=rpm-md
  gpgkey=https://ceph.com/git/?p=ceph.git;a=blob_plain;f=keys/release.asc
  [ceph-extras-noarch]
  name=Ceph Extra Packages and Backports noarch
  baseurl=http://ceph.com/packages/ceph-extras/rpm/centos6/noarch
  enabled=1
  gpgcheck=1
  type=rpm-md
  gpgkey=https://ceph.com/git/?p=ceph.git;a=blob_plain;f=keys/release.asc
 [ceph-extras-source]
 name=Ceph Extra Packages and Backports Sources
 baseurl=http://ceph.com/packages/ceph-extras/rpm/centos6/SRPMS
 enabled=1
 gpgcheck=1
 type=rpm-md
 gpgkey=https://ceph.com/git/?p=ceph.git;a=blob_plain;f=keys/release.asc
 centos-extras
#yum update
#yum remove qemu-img
#yum --disablerepo=* --enablerepo=ceph-extras install -y qemu-img
# yum --disablerepo=* --enablerepo=ceph-extras install -y qemu-kvm
# yum --disablerepo=* --enablerepo=ceph-extras install -y qemu-guest-agent
# yum --disablerepo=* --enablerepo=ceph-extras install -y qemu-kvm-tools

--> Check creating a QEMU image it should work

[root@rdo yum.repos.d]# qemu-img create -f rbd rbd:data/foo 10G
Formatting 'rbd:data/foo', fmt=rbd size=10737418240 cluster_size=0
[root@rdo yum.repos.d]#

[root@rdo yum.repos.d]# qemu-img info -f rbd rbd:data/foo
image: rbd:data/foo
file format: rbd
virtual size: 10G (10737418240 bytes)
disk size: unavailable
cluster_size: 4194304
[root@rdo yum.repos.d]#

Installing LIBVIRT


To use libvirt with Ceph, we must have a running Ceph Storage Cluster, and have installed and configured QEMU
yum install libvirt

Please Follow Ceph + OpenStack :: Part-2 for next step in installation


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