Scheduler base class that all Schedulers should inherit from
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class Scheduler
Bases: object
The base class that all Scheduler classes should inherit from.
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group_hosts(context, group)
Return the list of hosts that have VM’s from the group.
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hosts_up(context, topic)
Return the list of hosts that have a running service for topic.
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schedule_live_migration(context, instance, dest, block_migration, disk_over_commit)
Live migration scheduling method.
| Parameters: |
- context –
- instance – instance dict
- dest – destination host
- block_migration – if true, block_migration.
- disk_over_commit – if True, consider real(not virtual)
disk size.
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| Returns: | The host where instance is running currently.
Then scheduler send request that host.
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schedule_prep_resize(context, image, request_spec, filter_properties, instance, instance_type, reservations)
Must override schedule_prep_resize method for scheduler to work.
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schedule_run_instance(context, request_spec, admin_password, injected_files, requested_networks, is_first_time, filter_properties)
Must override schedule_run_instance method for scheduler to work.
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select_hosts(context, request_spec, filter_properties)
Must override select_hosts method for scheduler to work.
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update_service_capabilities(service_name, host, capabilities)
Process a capability update from a service node.
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encode_instance(instance, local=True)
Encode locally created instance for return via RPC.
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handle_schedule_error(context, ex, instance_uuid, request_spec)
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instance_update_db(context, instance_uuid, extra_values=None)
Clear the host and node - set the scheduled_at field of an Instance.
| Returns: | An Instance with the updated fields set properly. |
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