is it possible to manual decide the host when instance is being created instead of automatic assign host [closed]

asked 2014-08-14 09:24:08 -0500

orangeiv
51 ●4 ●5 ●8

Openstack engine will automatic(certain algorithm) settle the instance to back-end host if the openstack have several nova-compute node in order to balance workload for host.

In the some situation, Can I assign the nova-compute node by manual? decide by person?

I observed the below parameters to describe host and hypervisor_hostname in openstack API guide document. OS-EXT-SRV-ATTR:host OS-EXT-SRV-ATTR:hypervisor_hostname

Can i use them to decide nova-compute node where i want to create instance?

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Closed for the following reason the question is answered, right answer was accepted by orangeiv
close date 2014-08-18 18:56:42.601871

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I will test it and feedback

orangeiv ( 2014-08-14 10:28:16 -0500 )edit

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answered 2014-08-14 10:12:16 -0500

dbaxps

10788 ●57 ●112 ●224 http://bderzhavets.blo...

updated 2014-08-14 10:18:46 -0500

View http://docs.openstack.org/grizzly/ope...

Select a specific host to boot instances on

If you have the appropriate permissions, you can select the specific host where the instance will be launched. This is done using the --availability_zone zone:host arguments to the nova boot command. For example:

$ nova boot --image <uuid> --flavor m1.tiny --key_name test --availability-zone nova:server2

Starting with the Grizzly release, you can specify which roles are permitted to boot an instance to a specific host with the create:forced_host setting within policy.json on the desired roles. By default, only the admin role has this setting enabled.

You can view the list of valid compute hosts by using the nova hypervisor-list command, for example:

$ nova hypervisor-list
+----+---------------------+
| ID | Hypervisor hostname |
+----+---------------------+
| 1  | server2             |
| 2  | server3             |
| 3  | server4             |
+----+---------------------+