scheduler configuration options

Table 4.53. Description of scheduler configuration options

Configuration option = Default value	Description
[DEFAULT]
aggregate_image_properties_isolation_namespace =None	(StrOpt) Force the filter to consider only keys matching the given namespace.
aggregate_image_properties_isolation_separator =.	(StrOpt) The separator used between the namespace and keys
baremetal_scheduler_default_filters =RetryFilter, AvailabilityZoneFilter, ComputeFilter, ComputeCapabilitiesFilter, ImagePropertiesFilter, ExactRamFilter, ExactDiskFilter, ExactCoreFilter	(ListOpt) Which filter class names to use for filtering baremetal hosts when not specified in the request.
cpu_allocation_ratio = 0.0	(FloatOpt) Virtual CPU to physical CPU allocation ratio which affects all CPU filters. This configuration specifies a global ratio for CoreFilter. For AggregateCoreFilter, it will fall back to this configuration value if no per-aggregate setting found. NOTE: This can be set per-compute, or if set to 0.0, the value set on the scheduler node(s) will be used and defaulted to 16.0
disk_allocation_ratio = 1.0	(FloatOpt) Virtual disk to physical disk allocation ratio
io_ops_weight_multiplier = -1.0	(FloatOpt) Multiplier used for weighing host io ops. Negative numbers mean a preference to choose light workload compute hosts.
isolated_hosts =	(ListOpt) Host reserved for specific images
isolated_images =	(ListOpt) Images to run on isolated host
max_instances_per_host = 50	(IntOpt) Ignore hosts that have too many instances
max_io_ops_per_host = 8	(IntOpt) Tells filters to ignore hosts that have this many or more instances currently in build, resize, snapshot, migrate, rescue or unshelve task states 用在IoOpsFilter中，num_io_host在host_state中。
ram_allocation_ratio = 0.0	(FloatOpt) Virtual ram to physical ram allocation ratio which affects all ram filters. This configuration specifies a global ratio for RamFilter. For AggregateRamFilter, it will fall back to this configuration value if no per-aggregate setting found. NOTE: This can be set per-compute, or if set to 0.0, the value set on the scheduler node(s) will be used and defaulted to 1.5
ram_weight_multiplier = 1.0	(FloatOpt) Multiplier used for weighing ram. Negative numbers mean to stack vs spread.
reserved_host_disk_mb = 0	(IntOpt) Amount of disk in MB to reserve for the host
reserved_host_memory_mb = 512	(IntOpt) Amount of memory in MB to reserve for the host
restrict_isolated_hosts_to_isolated_images = True	(BoolOpt) Whether to force isolated hosts to run only isolated images
scheduler_available_filters =['nova.scheduler.filters.all_filters']	(MultiStrOpt) Filter classes available to the scheduler which may be specified more than once. An entry of "nova.scheduler.filters.all_filters" maps to all filters included with nova.
scheduler_default_filters = RetryFilter, AvailabilityZoneFilter, RamFilter, DiskFilter, ComputeFilter, ComputeCapabilitiesFilter, ImagePropertiesFilter, ServerGroupAntiAffinityFilter, ServerGroupAffinityFilter	(ListOpt) Which filter class names to use for filtering hosts when not specified in the request.
scheduler_driver =nova.scheduler.filter_scheduler.FilterScheduler	(StrOpt) Default driver to use for the scheduler
scheduler_driver_task_period = 60	(IntOpt) How often (in seconds) to run periodic tasks in the scheduler driver of your choice. Please note this is likely to interact with the value of service_down_time, but exactly how they interact will depend on your choice of scheduler driver.
scheduler_host_manager =nova.scheduler.host_manager.HostManager	(StrOpt) The scheduler host manager class to use
scheduler_host_subset_size = 1	(IntOpt) New instances will be scheduled on a host chosen randomly from a subset of the N best hosts. This property defines the subset size that a host is chosen from. A value of 1 chooses the first host returned by the weighing functions. This value must be at least 1. Any value less than 1 will be ignored, and 1 will be used instead
scheduler_instance_sync_interval = 120	(IntOpt) Waiting time interval (seconds) between sending the scheduler a list of current instance UUIDs to verify that its view of instances is in sync with nova. If the CONF option `scheduler_tracks_instance_changes` is False, changing this option will have no effect. 为nova compute manager中的一个周期任务
scheduler_json_config_location =	(StrOpt) Absolute path to scheduler configuration JSON file.
scheduler_manager =nova.scheduler.manager.SchedulerManager	(StrOpt) Full class name for the Manager for scheduler
scheduler_max_attempts = 3	(IntOpt) Maximum number of attempts to schedule an instance
scheduler_topic = scheduler	(StrOpt) The topic scheduler nodes listen on
scheduler_tracks_instance_changes = True	(BoolOpt) Determines if the Scheduler tracks changes to instances to help with its filtering decisions.
scheduler_use_baremetal_filters = False	(BoolOpt) Flag to decide whether to use baremetal_scheduler_default_filters or not.
scheduler_weight_classes =nova.scheduler.weights.all_weighers	(ListOpt) Which weight class names to use for weighing hosts

http://docs.openstack.org/liberty/config-reference/content/list-of-compute-config-options.html#config_table_nova_scheduler