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melanie witt bb0906f4f3 Add configuration of maximum disk devices to attach

This adds a new config option to control the maximum number of disk
devices allowed to attach to a single instance, which can be set per
compute host.

The configured maximum is enforced when device names are generated
during server create, rebuild, evacuate, unshelve, live migrate, and
attach volume. When the maximum is exceeded during server create,
rebuild, evacuate, unshelve, or live migrate, the server will go into
ERROR state and the server fault will contain the reason. When the
maximum is exceeded during an attach volume request, the request fails
fast in the API with a 403 error.

The configured maximum on the destination is not enforced before cold
migrate because the maximum is enforced in-place only (the destination
is not checked over RPC). The configured maximum is also not enforced
on shelved offloaded servers because they have no compute host, and the
option is implemented at the nova-compute level.

Part of blueprint conf-max-attach-volumes

Change-Id: Ia9cc1c250483c31f44cdbba4f6342ac8d7fbe92b

2019-01-30 15:47:10 +00:00

api_samples

Remove useless test samples for v2.66

2018-12-27 16:30:01 +00:00

ext

Replace support matrix ext with common library

2018-07-16 15:04:00 +01:00

notification_samples

The field instance_name was added to InstanceCreatePayload

2019-01-15 15:27:07 +00:00

source

Add configuration of maximum disk devices to attach