76549775fe
Use the formatting established in the style guide. There's a lot of out-of-date information in here, but that's a battle for another day. Change-Id: Ieec2c8f450c05a2451179e3bdba77514f2cc956e Signed-off-by: Stephen Finucane <stephenfin@redhat.com>
64 lines
1.5 KiB
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64 lines
1.5 KiB
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.. _compute_qemu:
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====
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QEMU
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====
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From the perspective of the Compute service, the QEMU hypervisor is
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very similar to the KVM hypervisor. Both are controlled through libvirt,
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both support the same feature set, and all virtual machine images that
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are compatible with KVM are also compatible with QEMU.
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The main difference is that QEMU does not support native virtualization.
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Consequently, QEMU has worse performance than KVM and is a poor choice
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for a production deployment.
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The typical uses cases for QEMU are
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* Running on older hardware that lacks virtualization support.
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* Running the Compute service inside of a virtual machine for
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development or testing purposes, where the hypervisor does not
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support native virtualization for guests.
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Configuration
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-------------
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To enable QEMU, configure :oslo.config:option:`DEFAULT.compute_driver` =
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``libvirt.LibvirtDriver`` and :oslo.config:option:`libvirt.virt_type` =
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``qemu``. For example:
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.. code-block:: ini
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[DEFAULT]
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compute_driver = libvirt.LibvirtDriver
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[libvirt]
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virt_type = qemu
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For some operations you may also have to install the :command:`guestmount`
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utility:
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On Ubuntu:
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.. code-block:: console
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# apt-get install guestmount
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On Red Hat Enterprise Linux, Fedora, or CentOS:
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.. code-block:: console
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# yum install libguestfs-tools
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On openSUSE:
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.. code-block:: console
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# zypper install guestfs-tools
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The QEMU hypervisor supports the following virtual machine image formats:
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* Raw
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* QEMU Copy-on-write (qcow2)
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* VMware virtual machine disk format (vmdk)
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