Re: ceph orch host drain daemon type

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Hello Eugen,

A month back, while playing with a lab cluster, I drained a multi-service host (OSDs, MGR, MON, etc.) in order to recreate all of its OSDs. During this operation, all cephadm containers were removed as expected, including the MGR. As a result, I got into a situation where the orchestrator backend 'cephadm' was missing and wouldn't load anymore. I didn't have much time to investigate this, so I decided to recreate the lab cluster. But I think this is due to a bug.

I would probably have avoided this situation if I had been able to ask the orchestrator to only drain services of type 'osd'. Makes sense.

Cheers,
Frédéric.

----- Le 27 Aoû 24, à 15:19, Eugen Block eblock@xxxxxx a écrit :

> Hi,
> 
> is there anything on the road map to be able to choose a specific
> daemon type to be entirely removed from a host instead of all cephadm
> managed daemons? I just did a quick search in tracker and github, but
> it may be "hidden" somewhere else.
> 
> I was thinking about colocated daemons on a host, for example MON,
> MGR, OSDs, node-exporter, crash. That's quite common, but if I just
> wanted to drain all OSDs (maybe mark them as "destroyed" in order to
> replace the drives), the usual 'ceph orch host drain <host>' command
> would remove all daemons. That seems unnecessary if I'm going to add
> the OSDs back.
> 
> Since there are a couple of other daemon types which can be deployed
> multiple times per host, e. g. MDS, RGW, it doesn't only make sense
> for OSDs but for other daemons as well. And those other daemons
> usually have some cryptic suffix, we wouldn't need that in order to
> get rid of them, it doesn't save that much time, but it could be a
> nice enhancement.
> 
> Should I create a tracker issue in the enhancement section for that?
> 
> Thanks!
> Eugen
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