CENTOS 6.5 安装CEPH RDB 错误
ERROR: modinfo: could not find module rbd
FATAL: Module rbd not found.
rbd: modprobe rbd failed! (256)

rpm --import http://elrepo.org/RPM-GPG-KEY-elrepo.org
rpm -Uvh http://elrepo.org/elrepo-release-6-5.el6.elrepo.noarch.rpm
yum --enablerepo=elrepo-kernel install kernel-ml

编辑etc/grub.conf

将default = 1 改为default = 0

解决办法:
Once you have deployed the almighty CEPH storage, you will want to be able to actualy use it (RBD).

Before we begin, some notes:

Current CEPH version: 0.67 (“dumpling”).
OS: Centos 6.4 x86_64 (running some VMs on KVM, basic CentOS qemu packages, nothing custom)

Since CEPH RBD module was first introduced with kernel 2.6.34 (and
current RHEL/CentOS kernel is 2.6.32) – that means we need a newer
kernel.

So, one of the options for the new kernel is, 3.x from elrepo.org:

rpm --import http://elrepo.org/RPM-GPG-KEY-elrepo.org
rpm -Uvh http://elrepo.org/elrepo-release-6-5.el6.elrepo.noarch.rpm
yum --enablerepo=elrepo-kernel install kernel-ml # will install 3.11.latest, stable, mainline
# or
yum --enablerepo=elrepo-kernel install kernel-lt # will install 3.0.latest, long term supported

CentOS KVM and CEPH – client side setup
Posted on October 14, 2013 by andrijars · Leave a comment
Once you have deployed the almighty CEPH storage, you will want to be able to actualy use it (RBD).

Before we begin, some notes:

Current CEPH version: 0.67 (“dumpling”).
OS: Centos 6.4 x86_64 (running some VMs on KVM, basic CentOS qemu packages, nothing custom)

Since CEPH RBD module was first introduced with kernel 2.6.34 (and
current RHEL/CentOS kernel is 2.6.32) – that means we need a newer
kernel.

So, one of the options for the new kernel is, 3.x from elrepo.org:

rpm –import http://elrepo.org/RPM-GPG-KEY-elrepo.org
rpm -Uvh http://elrepo.org/elrepo-release-6-5.el6.elrepo.noarch.rpm
yum –enablerepo=elrepo-kernel install kernel-ml # will install 3.11.latest, stable, mainline
# or
yum –enablerepo=elrepo-kernel install kernel-lt # will install 3.0.latest, long term supported
If you want that new kernel to boot by default, edit /etc/grub.conf, and change the Default=1 to Default=0, and reboot.

That’s for the Kernel side.

If you want to use qemu with RBD, you will also need newer qemu
packages – CEPH does provide some “untested”, “use it at your own risk”
packages, that are rhel/centos based verions, just with RBD support
added – well, running them on productional cloud, and all seems fine so
far for me…

wget http://ceph.com/packages/ceph-extras/rpm/rhel6/x86_64/qemu-kvm-0.12.1.2-2.355.el6.2.cuttlefish.x86_64.rpm
wget http://ceph.com/packages/ceph-extras/rpm/rhel6/x86_64/qemu-img-0.12.1.2-2.355.el6.2.cuttlefish.x86_64.rpm
wget http://ceph.com/packages/ceph-extras/rpm/rhel6/x86_64/qemu-kvm-tools-0.12.1.2-2.355.el6.2.cuttlefish.x86_64.rpm

After done, in order to actually install those CEPH-provided versions
of binaries, we need to download and install CEPH, that is the required
libraries librados and librbd:

rpm --import 'https://ceph.com/git/?p=ceph.git;a=blob_plain;f=keys/release.asc'
rpm -Uvh http://ceph.com/rpm-dumpling/el6/noarch/ceph-release-1-0.el6.noarch.rpm
yum install ceph

If all fine (will not talk here about creating the /etc/ceph.conf file
and keyring for the client – maybe another post), then we are ready to
install CEPH version of qemu packages:

First, we need to remove the original packages from Centos 6, then install the new ones:

rpm -e --nodeps qemu-img
rpm -e --nodeps qemu-kvm
rpm -e --nodeps qemu-kvm-tools
rpm -Uvh qemu-*

And… that’s it. If you run the qemu-img | grep “Supported formats” you will see RBD as being one od those.
You may shutdown and restart all your existing VMs, in order to load the new qemu binaries.

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