charm-nova-compute/config.yaml

options:
  debug:
    type: boolean
    default: False
    description: Enable debug logging.
  verbose:
    type: boolean
    default: False
    description: Enable verbose logging.
  use-syslog:
    type: boolean
    default: False
    description: |
      Setting this to True will allow supporting services to log to syslog.      
  openstack-origin:
    type: string
    default: caracal
    description: |
      Repository from which to install. May be one of the following:
      distro (default), ppa:somecustom/ppa, a deb URL sources entry or a
      supported Ubuntu Cloud Archive (UCA) release pocket.
      .
      Supported UCA sources include:
      .
      cloud:<series>-<openstack-release>
      cloud:<series>-<openstack-release>/updates
      cloud:<series>-<openstack-release>/staging
      cloud:<series>-<openstack-release>/proposed
      .
      For series=Precise we support UCA for openstack-release=
         * icehouse
      .
      For series=Trusty we support UCA for openstack-release=
         * juno
         * kilo
         * ...
      .
      NOTE: updating this setting to a source that is known to provide
      a later version of OpenStack will trigger a software upgrade.
      .      
  extra-repositories:
    type: string
    default:
    description: |
      Additional apt repositories to configure as installation sources for apt.
      The acceptable format of this option are those values accepted by the
      `add-apt-repository` command. Multiple repositories can be provided by
      separating the entries with a comma. Examples include:

      ppa:user/repository
      deb http://myserver/path/to/repo stable main
      ppa:userA/repository1, ppa:userB/repository2      
  action-managed-upgrade:
    type: boolean
    default: False
    description: |
      If True enables OpenStack upgrades for this charm via Juju actions.
      You will still need to set openstack-origin to the new repository but
      instead of an upgrade running automatically across all units, it will
      wait for you to execute the openstack-upgrade action for this charm on
      each unit. If False it will revert to existing behavior of upgrading
      all units on config change.      
  harden:
    type: string
    default:
    description: |
      Apply system hardening. Supports a space-delimited list of modules
      to run. Supported modules currently include os, ssh, apache and mysql.      
  nova-config:
    type: string
    default: /etc/nova/nova.conf
    description: Full path to Nova configuration file.
  rabbit-user:
    type: string
    default: nova
    description: Username used to access RabbitMQ queue.
  rabbit-vhost:
    type: string
    default: openstack
    description: RabbitMQ vhost.
  virt-type:
    type: string
    default: kvm
    description: |
      Virtualisation flavor. The only supported flavor is kvm.

      Other native libvirt flavors available for testing only: uml, lxc, qemu.

      NOTE: Changing the virtualisation flavor post-deployment is not
      supported.      
  inject-password:
    type: boolean
    default: False
    description: |
      Enable or disable admin password injection at boot time on hypervisors
      that use the libvirt back end (such as KVM, QEMU, and LXC).  The random
      password appears in the output of the 'openstack server create' command.      
  disk-cachemodes:
    type: string
    default:
    description: |
      Specific cachemodes to use for different disk types e.g:
      file=directsync,block=none      
  enable-resize:
    type: boolean
    default: False
    description: |
      Enable instance resizing.
      .
      NOTE: This also enables passwordless SSH access for user 'nova' between
      compute hosts.      
  enable-live-migration:
    type: boolean
    default: False
    description: |
      Configure libvirt or lxd for live migration.
      .
      Live migration support for lxd is still considered experimental.
      .
      NOTE: This also enables passwordless SSH access for user 'root' between
      compute hosts.      
  migration-auth-type:
    type: string
    default: ssh
    description: |
      TCP authentication scheme for libvirt live migration. Available options
      include ssh.      
  live-migration-completion-timeout:
    type: int
    default: 800
    description: |
      Time to wait, in seconds, for migration to successfully complete
      transferring data before aborting the operation. Value is per GiB
      of guest RAM + disk to be transferred, with lower bound of a minimum
      of 2 GiB. Should usually be larger than downtime-delay*downtime-steps
      Set to 0 to disable timeouts.      
  live-migration-downtime:
    type: int
    default: 500
    description: |
      Maximum permitted downtime, in milliseconds, for live migration
      switchover. Will be rounded up to a minimum of 100ms. Use
      a large value if guest liveness is unimportant.      
  live-migration-downtime-delay:
    type: int
    default: 75
    description: |
      Time to wait, in seconds, between each step increase of the migration
      downtime. Minimum delay is 10 seconds. Value is per GiB of guest
      RAM + disk to be transferred, with lower bound of a minimum of 2 GiB
      per device.      
  live-migration-downtime-steps:
    type: int
    default: 10
    description: |
      Number of incremental steps to reach max downtime value. Will be rounded
      up to a minimum of 3 steps.      
  live-migration-permit-post-copy:
    type: boolean
    default: False
    description: |
      If live-migration is enabled, this option allows Nova to switch an
      on-going live migration to post-copy mode. The switch will happen if the
      migration reaches 'live-migration-completion-timeout'. This supersedes
      'live-migration-permit-auto-converge'.      
  live-migration-permit-auto-converge:
    type: boolean
    default: False
    description: |
      If live-migration is enabled, this option allows Nova to throttle down
      CPU when an on-going live migration is slow. This is superseded by
      'live-migration-permit-post-copy'.      
  authorized-keys-path:
    type: string
    default: '{homedir}/.ssh/authorized_keys'
    description: |
      Only used when migration-auth-type is set to ssh.
      .
      Full path to authorized_keys file, can be useful for systems with
      non-default AuthorizedKeysFile location. It will be formatted using the
      following variables:
      .
        homedir - user's home directory
        username - username
      .      
  instances-path:
    type: string
    default:
    description: |
      Path used for storing Nova instances data - empty means default of
      /var/lib/nova/instances.      
  config-flags:
    type: string
    default:
    description: |
      Comma-separated list of key=value config flags. These values will be
      placed in the nova.conf [DEFAULT] section.      
  database-user:
    type: string
    default: nova
    description: Username for database access.
  database:
    type: string
    default: nova
    description: Nova database name.
  multi-host:
    type: string
    default: 'yes'
    description: |
      Whether to run nova-api and nova-network on the compute nodes. Note that
      nova-network is not available on Ussuri and later.      
  reserved-huge-pages:
    type: string
    default:
    description: |
      Sets a reserved amount of huge pages per NUMA nodes which are used by
      third-party components. Semicolons are used as separator.
      .
        reserved_huge_pages = node:0,size:2048,count:64;node:1,size:1GB,count:1
      .
      The above will consider 64 pages of 2MiB on NUMA node 0 and 1 page of
      1GiB on NUMA node 1 reserved. They will not be used by Nova to map guests
      memory.      
  pci-passthrough-whitelist:
    type: string
    default:
    description: |
      Sets the pci_passthrough_whitelist option in nova.conf which allows PCI
      passthrough of specific devices to VMs.
      .
      Example applications: GPU processing, SR-IOV networking, etc.
      .
      NOTE: For PCI passthrough to work IOMMU must be enabled on the machine
      deployed to. This can be accomplished by setting kernel parameters on
      capable machines in MAAS, tagging them and using these tags as
      constraints in the model.      
  pci-alias:
    type: string
    default:
    description: |
      The pci-passthrough-whitelist option of nova-compute charm is used for
      specifying which PCI devices are allowed passthrough. pci-alias is more
      a convenience that can be used in conjunction with Nova flavor properties
      to automatically assign required PCI devices to new instances. You could,
      for example, have a GPU flavor or a SR-IOV flavor:
      .
        pci-alias='{"vendor_id":"8086","product_id":"10ca","name":"a1"}'
      .
      This configures a new PCI alias 'a1' which will request a PCI device with
      a vendor id of 0x8086 and a product id of 10ca. To input a list of
      aliases, use the following syntax in this charm config option:
      .
        pci-alias='[{...},{...}]'
      .
      For more information about the syntax of pci_alias, refer to
      https://docs.openstack.org/ocata/config-reference/compute/config-options.html      
  reserved-host-memory:
    type: int
    default: 512
    description: |
      Amount of memory in MB to reserve for the host. Defaults to 512MB.      
  reserved-host-disk:
    type: int
    default: 0
    description: |
      Amount of disk resource in MB to reserve for the host. Defaults to 0MB.      
  vcpu-pin-set:
    type: string
    default:
    description: |
      Sets vcpu_pin_set option in nova.conf which defines which PCPUs that
      instance vCPUs can or cannot use. For example '^0,^2' to reserve two
      cpus for the host.
      .
      Starting from the Train release this option is deprecated and
      has been superseded by the 'cpu-shared-set' and
      'cpu-dedicated-set' options.  This option will be silently
      ignored if the 'cpu-dedicated-set' option is non-empty.      
  cpu-shared-set:
    type: string
    default:
    description: |
      Sets compute/cpu_shared_set option in nova.conf and defines which
      physical CPUs will be used for best-effort guest vCPU resources.
      Currently only used by libvirt driver to place guest emulator threads
      when hw:emulator_threads_policy:share is set.
      .
      This option is only available from the Rocky release and later.      
  cpu-dedicated-set:
    type: string
    default:
    description: |
      Sets compute/cpu_dedicated_set option in nova.conf and defines which
      physical CPUs will be used for dedicated guest vCPU resources.
      .
      This option is only available from the Train release and later.
      If non-empty it will silently stop the 'vcpu-pin-set' option
      from being used.      
  virtio-net-tx-queue-size:
    type: int
    default:
    description: |
      Sets libvirt/tx_queue_size option in nova.conf. Larger queues sizes for
      virtio-net devices increases networking performance by amortizing vCPU
      preemption and avoiding packet drops. Only works with Rocky and later,
      since QEMU 2.10.0 and libvirt 3.7.0. Default value 256. Authorized
      values [256, 512, 1024].      
  virtio-net-rx-queue-size:
    type: int
    default:
    description: |
      Sets libvirt/rx_queue_size option in nova.conf. Larger queues sizes for
      virtio-net devices increases networking performance by amortizing vCPU
      preemption and avoiding packet drops. Only works with Rocky and later,
      since QEMU 2.7.0 and libvirt 2.3.0. Default value 256. Authorized
      values [256, 512, 1024].      
  num-pcie-ports:
    type: int
    default:
    description: |
      Sets libvirt/num_pcie_ports option in nova.conf to assign more
      PCIe ports available for a VM. The default value relies on libvirt
      calculating amount of ports. The maximum value can be set is "28".
      .
      This option is only available from the Rocky release and later.      
  worker-multiplier:
    type: float
    default:
    description: |
      The CPU core multiplier to use when configuring worker processes for
      this services e.g. metadata-api. By default, the number of workers for
      each daemon is set to twice the number of CPU cores a service unit has.
      This default value will be capped to 4 workers unless this
      configuration option is set.      
  # Required if using FlatManager (nova-network)
  bridge-interface:
    type: string
    default: br100
    description: Bridge interface to be configured.
  bridge-ip:
    type: string
    default: 11.0.0.1
    description: IP to be assigned to bridge interface.
  bridge-netmask:
    type: string
    default: 255.255.255.0
    description: Netmask to be assigned to bridge interface.
  # Required if using FlatDHCPManager (nova-network)
  flat-interface:
    type: string
    default: eth1
    description: Network interface on which to build bridge.
  # Network config (by default all access is over 'private-address')
  os-internal-network:
    type: string
    default:
    description: |
      The IP address and netmask of the OpenStack Internal network (e.g.
      192.168.0.0/24)
      .
      This network will be used to bind vncproxy client.      
  use-internal-endpoints:
    type: boolean
    default: False
    description: |
      OpenStack mostly defaults to using public endpoints for
      internal communication between services. If set to True this option will
      configure services to use internal endpoints where possible.      
  prefer-ipv6:
    type: boolean
    default: False
    description: |
      If True enables IPv6 support. The charm will expect network interfaces
      to be configured with an IPv6 address. If set to False (default) IPv4
      is expected.
      .
      NOTE: these charms do not currently support IPv6 privacy extension. In
      order for this charm to function correctly, the privacy extension must be
      disabled and a non-temporary address must be configured/available on
      your network interface.      
  cpu-mode:
    type: string
    default:
    description: |
      Set to 'host-model' to clone the host CPU feature flags; to
      'host-passthrough' to use the host CPU model exactly; to 'custom' to
      use a named CPU model; to 'none' to not set any CPU model. If
      virt_type='kvm|qemu', it will default to 'host-model', otherwise it will
      default to 'none'. Defaults to 'host-passthrough' for ppc64el, ppc64le
      if no value is set.      
  cpu-model:
    type: string
    default:
    description: |
      Set to a named libvirt CPU model (see names listed in
      /usr/share/libvirt/cpu_map.xml). Only has effect if cpu_mode='custom' and
      virt_type='kvm|qemu'.
      .
      Starting from the Train release this option is deprecated and
      has been superseded by the 'cpu-models' option. This option will be
      silently ignored if the 'cpu-models' option is non-empty.      
  cpu-models:
    type: string
    default:
    description: |
      An ordered, comma separated, list of the CPU models supported by the host.
      The models on the list must be ordered according to the features they
      support. The less advanced models must precede more advanced, feature
      rich, models.
      .
      Example: 'SandyBridge,IvyBridge,Haswell,Broadwell'
      .
      CPU models are listed in:
        * /usr/share/libvirt/cpu_map.xml (libvirt version < 4.7.0)
        * /usr/share/libvirt/cpu_map/*.xml (libvirt version >= 4.7.0)
      .
      This option only has effect if cpu_mode='custom' and
      virt_type='kvm|qemu'.      
  cpu-model-extra-flags:
    type: string
    default:
    description: |
      Space delimited list of specific CPU flags for libvirt.      
  # Storage config
  libvirt-image-backend:
    type: string
    default:
    description: |
      Tell Nova which libvirt image backend to use. Supported backends are raw,
      qcow2, rbd and flat. If no backend is specified, the Nova default (qcow2) is
      used.
      NOTE: 'rbd' imagebackend is only supported with >= Juno.
      NOTE: 'flat' imagebackend is only supported with >= Newton and replaces 'raw'.      
  force-raw-images:
    type: boolean
    default: True
    description: |
      Force conversion of backing images to raw format. Note that the conversion
      process in Pike uses O_DIRECT calls - certain file systems do not support this,
      for example ZFS; e.g. if using the LXD provider with ZFS backend, this option
      should be set to False.      
  rbd-pool:
    type: string
    default: nova
    description: |
      RBD pool to use with Nova libvirt RBDImageBackend. Only required when you
      have libvirt-image-backend set to 'rbd'.      
  rbd-client-cache:
    type: string
    default:
    description: |
      Enable/disable RBD client cache. Leaving this value unset will result in
      default Ceph RBD client settings being used (RBD cache is enabled by
      default for Ceph >= Giant). Supported values here are 'enabled' or
      'disabled'.      
  ceph-osd-replication-count:
    type: int
    default: 3
    description: |
      This value dictates the number of replicas Ceph must make of any
      object it stores within the Nova RBD pool. Of course, this only
      applies if using Ceph as a backend store. Note that once the Nova
      RBD pool has been created, changing this value will not have any
      effect (although it can be changed in Ceph by manually configuring
      your Ceph cluster).      
  ceph-pool-weight:
    type: int
    default: 30
    description: |
      Defines a relative weighting of the pool as a percentage of the total
      amount of data in the Ceph cluster. This effectively weights the number
      of placement groups for the pool created to be appropriately portioned
      to the amount of data expected. For example, if the ephemeral volumes
      for the OpenStack compute instances are expected to take up 20% of the
      overall configuration then this value would be specified as 20. Note -
      it is important to choose an appropriate value for the pool weight as
      this directly affects the number of placement groups which will be
      created for the pool. The number of placement groups for a pool can
      only be increased, never decreased - so it is important to identify the
      percent of data that will likely reside in the pool.      
  restrict-ceph-pools:
    type: boolean
    default: False
    description: |
      Optionally restrict Ceph key permissions to access pools as required.      
  pool-type:
    type: string
    default: replicated
    description: |
      Ceph pool type to use for storage - valid values include ‘replicated’
      and ‘erasure-coded’.      
  ec-profile-name:
    type: string
    default:
    description: |
      Name for the EC profile to be created for the EC pools. If not defined
      a profile name will be generated based on the name of the pool used by
      the application.      
  ec-rbd-metadata-pool:
    type: string
    default:
    description: |
      Name of the metadata pool to be created (for RBD use-cases). If not
      defined a metadata pool name will be generated based on the name of
      the data pool used by the application.  The metadata pool is always
      replicated, not erasure coded.      
  ec-profile-k:
    type: int
    default: 1
    description: |
      Number of data chunks that will be used for EC data pool. K+M factors
      should never be greater than the number of available zones (or hosts)
      for balancing.      
  ec-profile-m:
    type: int
    default: 2
    description: |
      Number of coding chunks that will be used for EC data pool. K+M factors
      should never be greater than the number of available zones (or hosts)
      for balancing.      
  ec-profile-locality:
    type: int
    default:
    description: |
      (lrc plugin - l) Group the coding and data chunks into sets of size l.
      For instance, for k=4 and m=2, when l=3 two groups of three are created.
      Each set can be recovered without reading chunks from another set. Note
      that using the lrc plugin does incur more raw storage usage than isa or
      jerasure in order to reduce the cost of recovery operations.      
  ec-profile-crush-locality:
    type: string
    default:
    description: |
      (lrc plugin) The type of the CRUSH bucket in which each set of chunks
      defined by l will be stored. For instance, if it is set to rack, each
      group of l chunks will be placed in a different rack. It is used to
      create a CRUSH rule step such as step choose rack. If it is not set,
      no such grouping is done.      
  ec-profile-durability-estimator:
    type: int
    default:
    description: |
      (shec plugin - c) The number of parity chunks each of which includes
      each data chunk in its calculation range. The number is used as a
      durability estimator. For instance, if c=2, 2 OSDs can be down
      without losing data.      
  ec-profile-helper-chunks:
    type: int
    default:
    description: |
      (clay plugin - d) Number of OSDs requested to send data during
      recovery of a single chunk. d needs to be chosen such that
      k+1 <= d <= k+m-1. Larger the d, the better the savings.      
  ec-profile-scalar-mds:
    type: string
    default:
    description: |
      (clay plugin) specifies the plugin that is used as a building
      block in the layered construction. It can be one of jerasure,
      isa, shec (defaults to jerasure).      
  ec-profile-plugin:
    type: string
    default: jerasure
    description: |
      EC plugin to use for this applications pool. The following list of
      plugins are acceptable - jerasure, lrc, isa, shec, clay.      
  ec-profile-technique:
    type: string
    default:
    description: |
      EC profile technique used for this applications pool - will be
      validated based on the plugin configured via ec-profile-plugin.
      Supported techniques are ‘reed_sol_van’, ‘reed_sol_r6_op’,
      ‘cauchy_orig’, ‘cauchy_good’, ‘liber8tion’ for jerasure,
      ‘reed_sol_van’, ‘cauchy’ for isa and ‘single’, ‘multiple’
      for shec.      
  ec-profile-device-class:
    type: string
    default:
    description: |
      Device class from CRUSH map to use for placement groups for
      erasure profile - valid values: ssd, hdd or nvme (or leave
      unset to not use a device class).      
  # Other config
  sysctl:
    type: string
    default: |
      { net.ipv4.neigh.default.gc_thresh1 : 128,
        net.ipv4.neigh.default.gc_thresh2 : 28672,
        net.ipv4.neigh.default.gc_thresh3 : 32768,
        net.ipv6.neigh.default.gc_thresh1 : 128,
        net.ipv6.neigh.default.gc_thresh2 : 28672,
        net.ipv6.neigh.default.gc_thresh3 : 32768,
        net.nf_conntrack_max : 1000000,
        net.netfilter.nf_conntrack_buckets : 204800,
        net.netfilter.nf_conntrack_max : 1000000 }      
    description: |
      YAML formatted associative array of sysctl values, e.g.:
      '{ kernel.pid_max : 4194303 }'      
  # Huge page configuration - off by default
  hugepages:
    type: string
    default:
    description: |
      The percentage of system memory to use for hugepages e.g. '10%' or the
      total number of 2M hugepages - e.g. '1024'.
      For a systemd system (wily and later) the preferred approach is to enable
      hugepages via kernel parameters set in MAAS and systemd will mount them
      automatically.
      .
      NOTE: For hugepages to work it must be enabled on the machine deployed
      to. This can be accomplished by setting kernel parameters on capable
      machines in MAAS, tagging them and using these tags as constraints in the
      model.      
  ksm:
    type: string
    default: AUTO
    description: |
      Set to 1 to enable KSM, 0 to disable KSM, and AUTO to use default
      settings.
      .
      Please note that the AUTO value works for qemu 2.2+ (> Kilo), older
      releases will be set to 1 as default.      
  aa-profile-mode:
    type: string
    default: disable
    description: |
      Control experimental apparmor profile for Nova daemons
      (nova-compute, nova-api and nova-network).  This is separate to
      the apparmor profiles for KVM VMs which is controlled by libvirt
      and is on, in enforcing mode, by default.
      Valid settings: 'complain', 'enforce' or 'disable'.
      .
      Apparmor is disabled by default for the Nova daemons.      
  default-availability-zone:
    type: string
    default: nova
    description: |
      Default compute node availability zone.
      .
      This option determines the availability zone to be used when it is not
      specified in the VM creation request. If this option is not set, the
      default availability zone 'nova' is used. If customize-failure-domain
      is set to True, it will override this option only if an AZ is set by
      the Juju provider. If JUJU_AVAILABILITY_ZONE is not set, the value
      specified by this option will be used regardless of
      customize-failure-domain's setting.
      .
      NOTE: Availability zones must be created manually using the
      'openstack aggregate create' command.
      .      
  customize-failure-domain:
    type: boolean
    default: False
    description: |
      Juju propagates availability zone information to charms from the
      underlying machine provider such as MAAS and this option allows the
      charm to use JUJU_AVAILABILITY_ZONE to set default_availability_zone for
      Nova nodes. This option overrides the default-availability-zone charm
      config setting only when the Juju provider sets JUJU_AVAILABILITY_ZONE.      
  resume-guests-state-on-host-boot:
    type: boolean
    default: False
    description: |
      This option determines whether to start guests that were running
      before the host rebooted.      
  # Monitoring options
  nagios_context:
    type: string
    default: juju
    description: |
      Used by the nrpe-external-master subordinate charm. A string that will be
      prepended to instance name to set the host name in nagios. So for
      instance the hostname would be something like:
      .
        juju-myservice-0
      .
      If you're running multiple environments with the same services in them
      this allows you to differentiate between them.      
  nagios_servicegroups:
    type: string
    default:
    description: |
      A comma-separated list of nagios servicegroups. If left empty, the
      nagios_context will be used as the servicegroup.      
  use-multipath:
    type: boolean
    default: False
    description: |
      Use a multipath connection for iSCSI or FC volumes. Enabling this feature
      causes libvirt to login, discover and scan available targets before
      presenting the disk via device mapper (/dev/mapper/XX) to the VM instead
      of a single path (/dev/disk/by-path/XX). If changed after deployment,
      each VM will require a full stop/start for changes to take affect.      
  ephemeral-device:
    type: string
    default:
    description: |
      Block devices to use for storage of ephemeral disks to support nova
      instances; generally used in-conjunction with 'encrypt' to support
      data-at-rest encryption of instance direct attached storage volumes.      
  default-ephemeral-format:
    type: string
    default: ext4
    description: |
      The default format used to create an ephemeral volume. This format
      is used only if the volume ostype is default otherwise Nova
      ostype defaults are used (ext4 for linux, ntfs for windows) and
      these can be overriden using the virt-mkfs-cmds option.
      Possible values: ext2 ext3 ext4 xfs ntfs (only for Windows guests)      
  virt-mkfs-cmds:
    type: string
    default:
    description: |
      Nova-compute will default to using mkfs.vfat as the default method of
      formatting disks e.g. ephemeral volumes. If alternate commands are
      required they can be provided here as a comma-separated list with the
      format <os_type>=<mkfs command> e.g. 'default=mkfs.ext4,windows=mkfs.ntfs'.      
  encrypt:
    type: boolean
    default: False
    description: |
      Encrypt block devices used for Nova instances using dm-crypt, making use
      of vault for encryption key management; requires a relation to vault.      
  ephemeral-unmount:
    type: string
    default:
    description: |
      Cloud instances provide ephemeral storage which is normally mounted
      on /mnt.
      .
      Setting this option to the path of the ephemeral mountpoint will force
      an unmount of the corresponding device so that it can be used for as the
      backing store for local instances.  This is useful for testing purposes
      (cloud deployment is not a typical use case).      
  notification-format:
    type: string
    default: unversioned
    description: |
      There are two types of notifications in Nova: legacy notifications
      which have an unversioned payload and newer notifications which have
      a versioned payload.
      .
      Setting this option to `versioned` will use the versioned
      notification concept, `unversioned`, the unversioned notification concept
      and finally `both` will use the two concepts.
      .
      Starting in the Pike release, the notification_format includes both the
      versioned and unversioned message notifications. Ceilometer does not yet
      consume the versioned message notifications, so intentionally make the
      default notification format unversioned until this is implemented.
      .
      Possible Values are both, versioned, unversioned.      
  send-notifications-to-logs:
    type: boolean
    default: False
    description: |
      Ensure notifications are included in the log files. It will set an additional
      log driver for Oslo messaging notifications.      
  libvirt-migration-network:
    type: string
    default:
    description: |
      Specify a network in CIDR notation (192.168.0.0/24),
      which directs libvirt to use a specific network
      address as the live_migration_inbound_addr to make
      use of a dedicated migration network if possible.
      .
      Please note that if the migration binding has been
      declared and set, the primary address for that space has precedence
      over this configuration option.
      .
      This option doesn't have any effect on clouds running
      a release < Ocata.      
  bluestore-compression-algorithm:
    type: string
    default:
    description: |
      Compressor to use (if any) for pools requested by this charm.
      .
      NOTE: The ceph-osd charm sets a global default for this value (defaults
      to 'lz4' unless configured by the end user) which will be used unless
      specified for individual pools.      
  bluestore-compression-mode:
    type: string
    default:
    description: |
      Policy for using compression on pools requested by this charm.
      .
      'none' means never use compression.
      'passive' means use compression when clients hint that data is
      compressible.
      'aggressive' means use compression unless clients hint that
      data is not compressible.
      'force' means use compression under all circumstances even if the clients
      hint that the data is not compressible.      
  bluestore-compression-required-ratio:
    type: float
    default:
    description: |
      The ratio of the size of the data chunk after compression relative to the
      original size must be at least this small in order to store the
      compressed version on pools requested by this charm.      
  bluestore-compression-min-blob-size:
    type: int
    default:
    description: |
      Chunks smaller than this are never compressed on pools requested by
      this charm.      
  bluestore-compression-min-blob-size-hdd:
    type: int
    default:
    description: |
      Value of BlueStore compression min blob size for rotational media on
      pools requested by this charm.      
  bluestore-compression-min-blob-size-ssd:
    type: int
    default:
    description: |
      Value of BlueStore compression min blob size for solid state media on
      pools requested by this charm.      
  bluestore-compression-max-blob-size:
    type: int
    default:
    description: |
      Chunks larger than this are broken into smaller blobs sizing BlueStore
      compression max blob size before being compressed on pools requested by
      this charm.      
  bluestore-compression-max-blob-size-hdd:
    type: int
    default:
    description: |
      Value of BlueStore compression max blob size for rotational media on
      pools requested by this charm.      
  bluestore-compression-max-blob-size-ssd:
    type: int
    default:
    description: |
      Value of BlueStore compression max blob size for solid state media on
      pools requested by this charm.      
  initial-cpu-allocation-ratio:
    type: float
    default:
    description: |
      The initial value of per physical core -> virtual core ratio to use in
      the Nova scheduler; this may be overridden at runtime by the placement API.
      .
      Increasing this value will increase instance density on compute nodes
      at the expense of instance performance.
      .
      This option doesn't have any effect on clouds running
      a release < Stein.      
  initial-ram-allocation-ratio:
    type: float
    default:
    description: |
      The initial value of physical RAM -> virtual RAM ratio to use in
      the Nova scheduler; this may be overridden at runtime by the placement API.
      .
      Increasing this value will increase instance density on compute nodes
      at the potential expense of instance performance.
      .
      NOTE: When in a hyper-converged architecture, make sure to make enough
      room for infrastructure services running on your compute hosts by
      adjusting this value.
      .
      This option doesn't have any effect on clouds running
      a release < Stein.      
  initial-disk-allocation-ratio:
    type: float
    default:
    description: |
      The initial value of this disk allocation ratio. Increase the amount of
      disk space that nova can overcommit to guests.
      This may be overridden at runtime by the placement API.
      .
      Increasing this value will increase instance density on compute nodes
      with an increased risk of hypervisor storage becoming full.
      .
      This option doesn't have any effect on clouds running
      a release < Stein.      
  cpu-allocation-ratio:
    type: float
    default:
    description: |
      The per physical core -> virtual core ratio to use in the Nova scheduler.
      .
      Increasing this value will increase instance density on compute nodes
      at the expense of instance performance.      
  ram-allocation-ratio:
    type: float
    default:
    description: |
      The physical RAM -> virtual RAM ratio to use in the Nova scheduler.
      .
      Increasing this value will increase instance density on compute nodes
      at the potential expense of instance performance.
      .
      NOTE: When in a hyper-converged architecture, make sure to make enough
      room for infrastructure services running on your compute hosts by
      adjusting this value.      
  disk-allocation-ratio:
    type: float
    default:
    description: |
      Increase the amount of disk space that nova can overcommit to guests.
      .
      Increasing this value will increase instance density on compute nodes
      with an increased risk of hypervisor storage becoming full.      
  neutron-physnets:
    type: string
    default:
    description: |
      The physnets that are present on the host and NUMA affinity settings of
      that physnet for specific numa_nodes.
      .
      Example: 'foo:0;bar:0,1'
               '<physnet>:<numa-id>;<physnet>:<numa-id>,<numa-id>'
      .
      This option doesn't have any effect on clouds running
      a release < Rocky.      
  neutron-tunnel:
    type: string
    default:
    description: |
      A comma-separated list of NUMA node ids for tunnelled networking NUMA
      affinity.
      .
      Example: '0,1'
      .
      This option doesn't have any effect on clouds running
      a release < Rocky.      
  block-device-allocate-retries:
    type: int
    default: 300
    description: |
      Number of times to check for a volume to be available before
      attaching it during server create. The timeout is calculated with
      block-device-allocate-retries-interval(default: 3s) so the default
      timeout with the charm is 15 minutes (300 retries at 3-seconds
      interval).      
  block-device-allocate-retries-interval:
    type: int
    default:
    description: |
      Seconds between block device allocation retries. The default value
      is 3. Please refer to the description of the
      "block-device-allocate-retries" config for more details.      
  enable-vtpm:
    type: boolean
    default: False
    description: |
      Enable emulated Trusted Platform Module support on the hypervisors.
      A key manager, e.g. Barbican, is a required service for this
      capability to be enabled.