Chapter 17. Compute (nova) Parameters

ContainerNovaLibvirtUlimit

Ulimit for OpenStack Compute (nova) Libvirt Container. The default value is ['nofile=131072', 'nproc=126960'].

DeployIdentifier

Setting this to a unique value will re-run any deployment tasks which perform configuration on a OpenStack Orchestration (heat) stack-update.

DockerNovaComputeUlimit

Ulimit for OpenStack Compute (nova) Compute Container. The default value is ['nofile=131072', 'memlock=67108864'].

DockerNovaMigrationSshdPort

Port that dockerized nova migration target sshd service binds to. The default value is 2022.

EnableConfigPurge

Remove configuration that is not generated by the director. Used to avoid configuration remnants after upgrades. The default value is False.

EnableInstanceHA

Whether to enable an Instance Ha configurarion or not. This setup requires the Compute role to have the PacemakerRemote service added to it. The default value is False.

InstanceNameTemplate

Template string to be used to generate instance names. The default value is instance-%08x.

InternalTLSNbdCAFile

Specifies the CA cert to use for NBD TLS. The default value is /etc/pki/qemu/ca-cert.pem.

InternalTLSQemuCAFile

Specifies the CA cert to use for qemu. The default value is /etc/pki/CA/certs/qemu.pem.

InternalTLSVncCAFile

Specifies the CA cert to use for VNC TLS. The default value is /etc/pki/CA/certs/vnc.crt.

LibvirtCACert

This specifies the CA certificate to use for TLS in libvirt. This file will be symlinked to the default CA path in libvirt, which is /etc/pki/CA/cacert.pem. Note that due to limitations GNU TLS, which is the TLS backend for libvirt, the file must be less than 65K (so we can’t use the system’s CA bundle). This parameter should be used if the default (which comes from the InternalTLSCAFile parameter) is not desired. The current default reflects TripleO’s default CA, which is FreeIPA. It will only be used if internal TLS is enabled.

LibvirtEnabledPerfEvents

This is a performance event list which could be used as monitor. For example: cmt,mbml,mbmt. Make sure you are using Red Hat Enterprise Linux 7.4 as the base and libvirt version is 1.3.3 or above. Also ensure you have enabled the notifications and are using hardware with a CPU that supports the cmt flag.

LibvirtLogFilters

Defines a filter to select a different logging level for a given category log outputs, as specified in https://libvirt.org/logging.html . The default value is 1:libvirt 1:qemu 1:conf 1:security 3:event 3:json 3:file 3:object 1:util.

LibvirtNbdCACert

This specifies the CA certificate to use for NBD TLS. This file will be symlinked to the default CA path, which is /etc/pki/libvirt-nbd/ca-cert.pem. This parameter should be used if the default (which comes from the InternalTLSNbdCAFile parameter) is not desired. The current default reflects TripleO’s default CA, which is FreeIPA. It will only be used if internal TLS is enabled.

LibvirtTLSPassword

The password for the libvirt service when TLS is enabled.

LibvirtTLSPriority

Override the compile time default TLS priority string. The default value is NORMAL:-VERS-SSL3.0:-VERS-TLS-ALL:+VERS-TLS1.2.

LibvirtVncCACert

This specifies the CA certificate to use for VNC TLS. This file will be symlinked to the default CA path, which is /etc/pki/libvirt-vnc/ca-cert.pem. This parameter should be used if the default (which comes from the InternalTLSVncCAFile parameter) is not desired. The current default reflects TripleO’s default CA, which is FreeIPA. It will only be used if internal TLS is enabled.

MetadataNATRule

When true we create the NAT rule for the metadata service. The default value is False.

MigrationSshKey

SSH key for migration. Expects a dictionary with keys public_key and private_key. Values should be identical to SSH public/private key files. The default value is {'public_key': '', 'private_key': ''}.

MigrationSshPort

Target port for migration over ssh. The default value is 2022.

MysqlIPv6

Enable IPv6 in MySQL. The default value is False.

NeutronMetadataProxySharedSecret

Shared secret to prevent spoofing.

NeutronPhysnetNUMANodesMapping

Map of phynet name as key and NUMA nodes as value. For example: NeutronPhysnetNUMANodesMapping: {'foo': [0, 1], 'bar': [1]} where foo and bar are physnet names and corresponding values are list of associated numa_nodes.

NeutronTunnelNUMANodes

Used to configure NUMA affinity for all tunneled networks.

NotificationDriver

Driver or drivers to handle sending notifications. The default value is messagingv2.

NovaAdditionalCell

Whether this is an cell additional to the default cell. The default value is False.

NovaAutoDisabling

Max number of consecutive build failures before the nova-compute will disable itself. The default value is 10.

NovaComputeCpuSharedSet

A list or range of physical CPU cores will be used for best-effort guest vCPU resources (e.g. emulator threads in libvirt/QEMU). For example, NovaComputeCpuSharedSet: [4-12,^8,15] will reserve cores from 4-12 and 15, excluding 8.

NovaComputeEnableKsm

Whether to enable KSM on compute nodes or not. Especially in NFV use case one wants to keep it disabled. The default value is False.

NovaComputeLibvirtType

Libvirt domain type. Defaults to kvm. The default value is kvm.

NovaComputeLibvirtVifDriver

Libvirt VIF driver configuration for the network.

NovaComputeOptEnvVars

List of optional environment variables.

NovaComputeOptVolumes

List of optional volumes.

NovaCronArchiveDeleteRowsDestination

Cron to move deleted instances to another table - Log destination. The default value is /var/log/nova/nova-rowsflush.log.

NovaCronArchiveDeleteRowsHour

Cron to move deleted instances to another table - Hour. The default value is 0.

NovaCronArchiveDeleteRowsMaxRows

Cron to move deleted instances to another table - Max Rows. The default value is 100.

NovaCronArchiveDeleteRowsMinute

Cron to move deleted instances to another table - Minute. The default value is 1.

NovaCronArchiveDeleteRowsMonth

Cron to move deleted instances to another table - Month. The default value is *.

NovaCronArchiveDeleteRowsMonthday

Cron to move deleted instances to another table - Month Day. The default value is *.

NovaCronArchiveDeleteRowsPurge

Purge shadow tables immediately after scheduled archiving. The default value is False.

NovaCronArchiveDeleteRowsUntilComplete

Cron to move deleted instances to another table - Until complete. The default value is True.

NovaCronArchiveDeleteRowsUser

Cron to move deleted instances to another table - User. The default value is nova.

NovaCronArchiveDeleteRowsWeekday

Cron to move deleted instances to another table - Week Day. The default value is *.

NovaCronDBArchivedHour

Cron to move deleted instances to another table that doesn’t need backup - Hour. The default value is 0.

NovaCronDBArchivedMaxDelay

Cron to move deleted instances to another table that doesn’t need backup - Max Delay. The default value is 3600.

NovaCronDBArchivedMinute

Cron to move deleted instances to another table that doesn’t need backup - Minute. The default value is 1.

NovaCronDBArchivedMonth

Cron to move deleted instances to another table that doesn’t need backup - Month. The default value is *.

NovaCronDBArchivedMonthday

Cron to move deleted instances to another table that doesn’t need backup - Month Day. The default value is *.

NovaCronDBArchivedWeekday

Cron to move deleted instances to another table that doesn’t need backup - Week Day. The default value is *.

NovaCronPurgeShadowTablesAge

Cron to purge shadow tables - Age This will define the retention policy when purging the shadow tables in days. 0 means, purge data older than today in shadow tables. The default value is 14.

NovaCronPurgeShadowTablesAllCells

Cron to purge shadow tables - All cells. The default value is False.

NovaCronPurgeShadowTablesDestination

Cron to purge shadow tables - Log destination. The default value is /var/log/nova/nova-rowspurge.log.

NovaCronPurgeShadowTablesHour

Cron to purge shadow tables - Hour. The default value is 5.

NovaCronPurgeShadowTablesMinute

Cron to purge shadow tables - Minute. The default value is 0.

NovaCronPurgeShadowTablesMonth

Cron to purge shadow tables - Month. The default value is *.

NovaCronPurgeShadowTablesMonthday

Cron to purge shadow tables - Month Day. The default value is *.

NovaCronPurgeShadowTablesUser

Cron to purge shadow tables - User. The default value is nova.

NovaCronPurgeShadowTablesVerbose

Cron to purge shadow tables - Verbose. The default value is False.

NovaCronPurgeShadowTablesWeekday

Cron to purge shadow tables - Week Day. The default value is *.

NovaDbSyncTimeout

Timeout for OpenStack Compute (nova) database synchronization in seconds. The default value is 300.

NovaDefaultFloatingPool

Default pool for floating IP addresses. The default value is public.

NovaEnableDBArchive

Whether to create cron job for archiving soft deleted rows in OpenStack Compute (nova) database. The default value is True.

NovaEnableDBPurge

Whether to create cron job for purging soft deleted rows in OpenStack Compute (nova) database. The default value is True.

NovaEnableNUMALiveMigration

Whether to enable or not the live migration for NUMA topology instances. The default value is False.

NovaHWMachineType

To specify a default machine type per host architecture. The default value is x86_64=pc-i440fx-rhel7.6.0,aarch64=virt-rhel7.6.0,ppc64=pseries-rhel7.6.0,ppc64le=pseries-rhel7.6.0.

NovaIPv6

Enable IPv6 features for OpenStack Compute (nova). The default value is False.

NovaLibvirtFileBackedMemory

Available capacity in MiB for file-backed memory. The default value is 0.

NovaLibvirtMemStatsPeriodSeconds

A number of seconds to memory usage statistics period, zero or negative value mean to disable memory usage statistics. The default value is 10.

NovaLibvirtNumPciePorts

Set num_pcie_ports to specify the number of PCIe ports an instance will get. Libvirt allows a custom number of PCIe ports (pcie-root-port controllers) a target instance will get. Some will be used by default, rest will be available for hotplug use. The default value is 16.

NovaLibvirtRxQueueSize

Virtio-net RX queue size. Valid values are 256, 512, 1024. The default value is 512.

NovaLibvirtTxQueueSize

Virtio-net TX queue size. Valid values are 256, 512, 1024. The default value is 512.

NovaLibvirtVolumeUseMultipath

Whether to enable or not the multipath connection of the volumes. The default value is False.

NovaLiveMigrationWaitForVIFPlug

Whether to wait for network-vif-plugged events before starting guest transfer. The default value is True.

NovaNfsEnabled

Whether to enable or not the NFS backend for OpenStack Compute (nova). The default value is False.

NovaNfsOptions

NFS mount options for nova storage (when NovaNfsEnabled is true). The default value is context=system_u:object_r:nfs_t:s0.

NovaNfsShare

NFS share to mount for nova storage (when NovaNfsEnabled is true).

NovaNfsVersion

NFS version used for nova storage (when NovaNfsEnabled is true). Since NFSv3 does not support full locking a NFSv4 version need to be used. To not break current installations the default is the previous hard coded version 4. The default value is 4.

NovaOVSBridge

Name of integration bridge used by Open vSwitch. The default value is br-int.

NovaOVSDBConnection

OVS DB connection string to used by OpenStack Compute (nova).

NovaPCIPassthrough

YAML list of PCI passthrough whitelist parameters.

NovaPassword

The password for the OpenStack Compute (nova) service and database account.

NovaPlacementAPIInterface

Endpoint interface to be used for the placement API. The default value is internal.

NovaReservedHostMemory

Reserved RAM for host processes. The default value is 4096.

NovaResumeGuestsShutdownTimeout

Number of seconds we’re willing to wait for a guest to shut down. If this is 0, then there is no time out (use with caution, as guests might not respond to a shutdown request). The default value is 300 seconds (5 minutes). The default value is 300.

NovaResumeGuestsStateOnHostBoot

Whether to start running instance on compute host reboot. The default value is False.

NovaSchedulerAvailableFilters

List of available filters for OpenStack Compute (nova) to use to filter nodes.

NovaSchedulerDefaultFilters

An array of filters OpenStack Compute (nova) uses to filter a node. OpenStack Compute applies these filters in the order they are listed. Place your most restrictive filters first to make the filtering process more efficient.

NovaSchedulerDiscoverHostsInCellsInterval

This value controls how often (in seconds) the scheduler should attempt to discover new hosts that have been added to cells. The default value of -1 disables the periodic task completely. It is recommended to set this parameter for deployments using OpenStack Bare Metal (ironic). The default value is -1.

NovaSchedulerMaxAttempts

Maximum number of attempts the scheduler will make when deploying the instance. You should keep it greater or equal to the number of bare metal nodes you expect to deploy at once to work around potential race conditions when scheduling. The default value is 3.

NovaSchedulerWorkers

Number of workers for OpenStack Compute (nova) Scheduler services. The default value is 0.

NovaSyncPowerStateInterval

Interval to sync power states between the database and the hypervisor. Set to -1 to disable. Setting this to 0 will run at the default rate. The default value is 0.

NovaVcpuPinSet

A list or range of physical CPU cores to reserve for virtual machine processes. For example, NovaVcpuPinSet: [4-12,^8] reserves cores from 4-12 excluding 8.

NovaWorkers

Number of workers for the Compute’s Conductor service. Note that more workers creates a larger number of processes on systems, which results in excess memory consumption. 0 sets to the OpenStack internal default, which is equal to the number of CPU cores on the node. The default value is 0.

QemuCACert

This specifies the CA certificate to use for qemu. This file will be symlinked to the default CA path, which is /etc/pki/qemu/ca-cert.pem. This parameter should be used if the default (which comes from the InternalTLSQemuCAFile parameter) is not desired. The current default reflects TripleO’s default CA, which is FreeIPA. It will only be used if internal TLS is enabled.

QemuMemoryBackingDir

Directory used for memoryBacking source if configured as file. NOTE: big files will be stored here.

StackUpdateType

Type of update, to differentiate between UPGRADE and UPDATE cases when StackAction is UPDATE (both are the same stack action).

UpgradeLevelNovaCompute

OpenStack Compute upgrade level.

UseTLSTransportForNbd

If set to true and if EnableInternalTLS is enabled, it will enable TLS transport for libvirt NBD and configure the relevant keys for libvirt. The default value is True.

UseTLSTransportForVnc

If set to true and if EnableInternalTLS is enabled, it will enable TLS transport for libvirt VNC and configure the relevant keys for libvirt. The default value is True.

VerifyGlanceSignatures

Whether to verify image signatures. The default value is False.

VhostuserSocketGroup

The vhost-user socket directory group name. Defaults to qemu. When vhostuser mode is dpdkvhostuserclient (which is the default mode), the vhost socket is created by qemu. The default value is qemu.