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Import the following files from the former config-reference [1]: api.rst cells.rst fibre-channel.rst hypervisor-basics.rst hypervisor-hyper-v.rst hypervisor-kvm.rst hypervisor-lxc.rst hypervisor-qemu.rst hypervisor-virtuozzo.rst hypervisor-vmware.rst hypervisor-xen-api.rst hypervisor-xen-libvirt.rst hypervisors.rst index.rst iscsi-offload.rst logs.rst resize.rst samples/api-paste.ini.rst samples/index.rst samples/policy.yaml.rst samples/rootwrap.conf.rst schedulers.rst The below files are skipped as they're already included, in slightly different forms, in the nova documentation. config-options.rst nova-conf-samples.rst nova-conf.rst nova.conf Part of bp: doc-migration Change-Id: I145e38149bf20a5e068f8cfe913f90c7ebeaad36
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QEMU
From the perspective of the Compute service, the QEMU hypervisor is very similar to the KVM hypervisor. Both are controlled through libvirt, both support the same feature set, and all virtual machine images that are compatible with KVM are also compatible with QEMU. The main difference is that QEMU does not support native virtualization. Consequently, QEMU has worse performance than KVM and is a poor choice for a production deployment.
The typical uses cases for QEMU are
- Running on older hardware that lacks virtualization support.
- Running the Compute service inside of a virtual machine for development or testing purposes, where the hypervisor does not support native virtualization for guests.
To enable QEMU, add these settings to nova.conf:
compute_driver = libvirt.LibvirtDriver
[libvirt]
virt_type = qemuFor some operations you may also have to install the guestmount utility:
On Ubuntu:
# apt-get install guestmountOn Red Hat Enterprise Linux, Fedora, or CentOS:
# yum install libguestfs-toolsOn openSUSE:
# zypper install guestfs-toolsThe QEMU hypervisor supports the following virtual machine image formats:
- Raw
- QEMU Copy-on-write (qcow2)
- VMware virtual machine disk format (vmdk)