Re: ceph-volume: hard to replace ceps-disk now and not good implemented

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On Sun, Apr 1, 2018 at 5:32 PM, Willem Jan Withagen <wjw@xxxxxxxxxxx> wrote:
> On 01/04/2018 14:06, Alfredo Deza wrote:
>
>> I closed them because ceph-volume cannot work without systemd.
>
>
> Alfredo,
>
> I have not yet started looking into ceph-volume due to the full load at
> $work.
>
> But if this dependency on systemd is the 100% the case, than I don't even
> have to. FreeBSD does not have it, and with 99,9% certainty will never have.

There is currently a dependency on systemd for `ceph-volume lvm
activate`, but ceph-volume wasn't created in a way that would
mean this is the only way.

A lot (most?) of the common parts for preparing, and activating an OSD
are placed in places where it can be reused. For other non-systemd
units, I would suggest
starting to look into creating a plugin that can borrow all the bits
and pieces that are "public" in ceph-volume, for example:

https://github.com/ceph/ceph/blob/master/src/ceph-volume/ceph_volume/util/prepare.py

It shouldn't be hard to wire up a plugin to a different initd system.
The way we do it currently is just a single call to
`ceph-volume-systemd` which forwards the information needed (OSD ID
and FSID)
to `ceph-volume systemd`. You can see that the systemd unit is fairly simple:

https://github.com/ceph/ceph/blob/master/systemd/ceph-volume%40.service



>
> So what do you suggest I do from here on, for creating Ceph {mon,osd,...} ??
>
> --WjW
>
>
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