Hello Michael,
I did a quick grep over archive with mails from openstack-dev list. It seems
that topic about rescue mode was raised in August last year. I did not find
anything directly related to metadata.
Understand that changing user metadata (with command `nova meta {uuid} set
key=value`) when VM is in rescue mode, could cause some issues.
Cheers,
Pawel
________________________________
Od: Michael Still <[email protected]<mailto:[email protected]>>
Temat: Odp: [openstack-dev] [nova] Would be possible to modify metadata when
instance is in rescued state?
Data: 9 maja 2017 09:09:31 CEST
Do: "OpenStack Development Mailing List (not for usage questions)"
<[email protected]<mailto:[email protected]>>
Odpowiedź-do: "OpenStack Development Mailing List \(not for usage questions\)"
<[email protected]<mailto:[email protected]>>
This sort of question comes up every six months or so it seems.
The issue is that for config drive users we don't have a way of rebuilding all
of the config drive (for example, the root password is gone). That's probably
an issue for rescue because its presumably one of the things you might reset.
I'm not opposed to exploring options, but I think we need someone to come up
with a proposal which addresses previous concerns. I'd recommend a quick search
of the mailing list archives for previous discussions.
Hope this helps,
Michael
On Tue, May 9, 2017 at 5:04 PM, Pawel Suder
<[email protected]<mailto:[email protected]>> wrote:
Hello,
I would like to raise a topic regarding possibilities when metadata could be
modified on instance.
We noticed that instance metadata could be modified only when vm_state is set
to following values:
* active
* paused
* suspended
* stopped
Found:
https://github.com/openstack/nova/blob/master/nova/compute/api.py#L3916-L3920
https://github.com/openstack/nova/blob/master/nova/compute/api.py#L3905-L3908
>From time to time it is needed to have instance in rescued state.
Scenario: VM is rescued and special metadata attributes need to be set to allow
cloud-init to act specifically for rescue mode. Metadata data should be
available only during rescue mode.
Question: what kind of impact could be observed when checks for instance state
will be modified for methods:
update_instance_metadata
delete_instance_metadata
Thank you,
Cheers,
Pawel
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