openstack scheduler 配置参数说明

Table 5.23. Description of nova.conf file configuration options for schedulers that use algorithms to assign VM launch on particular compute hosts
Configuration option=Default value	(Type) Description
scheduler_host_manager=nova.scheduler.host_manager.HostManager	(StrOpt) The scheduler host manager class to use.
scheduler_max_attempts=3	(IntOpt) Maximum number of attempts to schedule an instance before giving up and setting the instance to error.
cpu_allocation_ratio=16.0	(FloatOpt) Virtual CPU to Physical CPU allocation ratio.
ram_allocation_ratio=1.5	(FloatOpt) virtual ram to physical ram allocation ratio.
reserved_host_disk_mb=0	(IntOpt) Amount of disk in MB to reserve for host/dom0.
reserved_host_memory_mb=512	(IntOpt) Amount of memory in MB to reserve for host/dom0.
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=AvailabilityZoneFilter,RamFilter,ComputeFilter	(ListOpt) Which filter class names to use for filtering hosts when not specified in the request.
compute_fill_first_cost_fn_weight=-1.0	(FloatOpt) How much weight to give the fill-first cost function. A negative value will reverse behavior: e.g. spread-first.
retry_host_cost_fn_weight=1.0	(FloatOpt) How much weight to give the retry host cost function. A negative value will reverse behavior: e.g. use multiple-times-retried hosts first.
least_cost_functions=nova.scheduler.least_cost.compute_fill_first_cost_fn	(ListOpt) Which cost functions the LeastCostScheduler should use.
noop_cost_fn_weight=1.0	(FloatOpt) How much weight to give the noop cost function.
scheduler_driver=nova.scheduler.multi.MultiScheduler	(StrOpt) Default driver to use for the scheduler.
compute_scheduler_driver=nova.scheduler.filter_scheduler.FilterScheduler	(StrOpt) Driver to use for scheduling Compute calls.
volume_scheduler_driver=nova.scheduler.chance.ChanceScheduler	(StrOpt) Driver to use for scheduling volume calls.
scheduler_json_config_location=	(StrOpt) Absolute path to scheduler configuration JSON file.
max_cores=16	(IntOpt) maximum number of instance cores to allow per host.
max_gigabytes=10000	(IntOpt) maximum number of volume gigabytes to allow per host.
max_networks=1000	(IntOpt) maximum number of networks to allow per host.
skip_isolated_core_check=true	(BoolOpt) Allow overcommitting vcpus on isolated hosts.
scheduler_host_subset_size=1	(IntOpt) New instances will be scheduled on a host chosen randomly from a subset of the N best hosts, rather than just the host with the highest weight. 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.