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==============
QEMU and RBD
==============
Ceph integrates with the QEMU virtual machine. For details on QEMU, see
`QEMU Open Source Processor Emulator`_. For QEMU documentation, see
`QEMU Manual`_.
Installing QEMU on Ubuntu 12.04Precise
--------------------------------------
QEMU packages are incorporated into the Ubuntu 12.04 precise distribution. To
install QEMU on precise, execute the following::
sudo apt-get install qemu
Installing QEMU on Earlier Versions of Ubuntu
---------------------------------------------
For Ubuntu distributions 11.10 oneiric and earlier, you must install
the 0.15 version of QEMU or later. To build QEMU from source, use the
following procedure::
cd {your-development-directory}
git clone git://git.qemu.org/qemu.git
cd qemu
./configure --enable-rbd
make; make install
Creating RBD Images with QEMU
-----------------------------
You can create an RBD image from QEMU. You must specify ``rbd``,
the pool name, and the name of the image you wish to create. You must also
specify the size of the image. ::
qemu-img create -f rbd rbd:{pool-name}/{image-name} {size}
For example::
qemu-img create -f rbd rbd:data/foo 10G
Resizing RBD Images with QEMU
-----------------------------
You can resize an RBD image from QEMU. You must specify ``rbd``,
the pool name, and the name of the image you wish to resize. You must also
specify the size of the image.
qemu-img resize -f rbd rbd:{pool-name}/{image-name} {size}
For example::
qemu-img resize -f rbd rbd:data/foo 10G
Retrieving RBD Image Information with QEMU
------------------------------------------
You can retrieve RBD image information from QEMU. You must
specify ``rbd``, the pool name, and the name of the image. ::
qemu-img info -f rbd rbd:{pool-name}/{image-name}
For example::
qemu-img info -f rbd rbd:data/foo
.. _QEMU Open Source Processor Emulator: http://wiki.qemu.org/Main_Page
.. _QEMU Manual: http://wiki.qemu.org/Manual
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