Re: [External Email] Re: Recreate Destroyed OSD

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Hi Adam,

Thanks a lot for sharing this information. It confirms our observations.

Regards,
Frédéric.

----- Le 6 Nov 24, à 20:23, Adam King adking@xxxxxxxxxx a écrit :

> Quick comment on the CLI argos vs. the spec file. It actually shouldn't
> allow you to do both for any flags that actually affect the service. If you
> run `ceph orch apply -i <filepath>` it will only make use of the spec file
> and should return an error if flags that affect the service like
> `--unamanged` or `--placement` are passed. Separately, there are a number
> of `ceph orch apply <service-name>` commands e.g. `ceph orch apply nfs`
> that will return an error if a spec file is passed in. The only exception
> off the top of my head is `ceph orch apply osd` which will force you to
> either pass a spec file or pass `--all-available-devices`. If anything else
> does let you pass in relevant CLI args and a spec file at the same time
> it's likely an oversight / bug.
> 
> As for the osd service, it is correct that the service just called "osd" is
> not a real service / a placeholder for OSDs that don't have a service. In
> later releases it will actually block you from creating a service with
> 
> service_type: osd
> service_name: osd
> 
> so that that placeholder isn't attached to an actual spec file. Since
> that's already happened, what I'd personally recommend is re-applying that
> spec file but without the `service_name` field and instead adding something
> like `service_id: foo`. That would create an osd.foo service. For the time
> being, given nothing else in the spec was modified, it won't have any OSDs
> on it as the only matching device has already been made part of an OSD. To
> get that OSD to fall under that service, you can go onto the `ceph01` node
> directly, and edit the "service_name" field of the
> /var/lib/ceph/<fsid>/osd.<osd-id>/unit.meta file to be "osd.foo" or
> whatever name you pick, then run `ceph orch ps --refresh`, wait a bit and
> it should appear under `osd.foo` rather than the "osd" service. Then you
> can just do `ceph orch rm osd` to delete the old spec file that became
> attached to the "osd" service. In the future there are also plans to add a
> `ceph orch` command to change the OSD spec affinity so you don't need to do
> the extra steps, as well as probably allowing service actions against the
> "osd" service (even though it's just a placeholder in reality) but none of
> that exists currently.
> 
> On Wed, Nov 6, 2024 at 11:50 AM Tim Holloway <timh@xxxxxxxxxxxxx> wrote:
> 
>>
>> On 11/6/24 11:04, Frédéric Nass wrote:
>> > ...
>> > You could enumerate all hosts one by one or use a pattern like
>> 'ceph0[1-2]'
>> >
>> > You may also use regex patterns depending on the version of Ceph that
>> you're using. Check [1].
>> > Regex patterns should be available in next minor Quincy release 17.2.8.
>> >
>> > [1] https://github.com/ceph/ceph/pull/53803
>> > [2] https://github.com/ceph/ceph/pull/56222
>>
>> This simple wildcard scheme is called "globbing" and it's what is
>> typically used by Unix-style command shells.
>>
>> It's convenient, but limited. For more subtlety you'd need a regex.
>>
>> >> More generally, is there a higher level document that talks about Ceph
>> spec
>> >> files and the orchestrator - something that deals with the general
>> concepts?
>> >
>> I've submitted an outline on the issue tracker for a comprehensive and
>> coherent document on the creation and maintenance of OSDs.
>>
>>
>> Spec files, as I mentioned earlier, are YAML-format declarations of the
>> specifications to be applied to create or update one or more resources.
>> You can define spec files not only for OSDs, but for other Ceph
>> resources as well and I *think* a unified spec file for multiple
>> resource types.
>>
>> By convention, any orchestrator command that can get its options from a
>> spec file will do so via the "-i  {filename}" command line option. If
>> you put options on both the spec file and the orchestrator command line,
>> presumably the command line will take precedence, as that's the general
>> convention for such things. It may or may not warn you that it's doing
>> so, though.
>>
>>
>>    Tim
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