2.3 KiB
Nova - Compute Service
Nova is a core service in OpenStack, and provides compute services. Typically this is via Virtual Machines (VMs), but may also be via bare metal servers if Nova is coupled with Ironic.
Nova is enabled by default, but may be disabled by setting
enable_nova
to no
in
globals.yml
.
Virtualisation Drivers
The virtualisation driver may be selected via
nova_compute_virt_type
in globals.yml
.
Supported options are qemu
, kvm
, and
vmware
. The default is kvm
.
Libvirt
Information on the libvirt-based drivers kvm
and
qemu
can be found in libvirt-guide
.
VMware
Information on the VMware-based driver vmware
can be
found in vmware-guide
.
Bare Metal
Information on using Nova with Ironic to deploy compute instances to
bare metal can be found in ../bare-metal/ironic-guide
.
Fake Driver
The fake driver can be used for testing Nova's scaling properties
without requiring access to a large amount of hardware resources. It is
covered in nova-fake-driver
.
Consoles
The console driver may be selected via nova_console
in
globals.yml
. Valid options are none
,
novnc
and spice
. Additionally, serial console
support can be enabled by setting
enable_nova_serialconsole_proxy
to yes
.
Cells
Information on using Nova Cells V2 to scale out can be found in nova-cells-guide
.
Vendordata
Nova supports passing deployer provided data to instances using a
concept known as Vendordata. If a Vendordata file is located in the
following path within the Kolla configuration, Kolla will automatically
use it when the Nova service is deployed or reconfigured:
/etc/kolla/config/nova/vendordata.json
.
Failure handling
Compute service registration
During deployment, Kolla Ansible waits for Nova compute services to register themselves. By default, if a compute service does not register itself before the timeout, that host will be marked as failed in the Ansible run. This behaviour is useful at scale, where failures are more frequent.
Alternatively, to fail all hosts in a cell when any compute service
fails to register, set nova_compute_registration_fatal
to
true
.