On Tue, Jun 27, 2017 at 2:19 PM Wido den Hollander <wido@xxxxxxxx> wrote:
> Op 27 juni 2017 om 19:00 schreef george.vasilakakos@xxxxxxxxxx:
>
>
> Hey Ceph folks,
>
> I was wondering what the current status/roadmap/intentions etc. are on the possibility of providing a way of transitioning a cluster from IPv4 to IPv6 in the future.
>
> My current understanding is that this not possible at the moment and that one should deploy initially with the version they want long term.
>
> However, given the general lack of widespread readiness, I think lots of us have deployed with IPv4 and were hoping to go to IPv6 when the rest of our environments enabled it.
>
> Is adding such a capability to a future version of Ceph being considered?
>
I think you can, but not without downtime.
The main problem is the monmap which contains IPv4 addresses and you want to change that to IPv6.
I haven't tried this, but I think you should be able to:
- Extract MONMap
- Update the IPv4 addresses to IPv6 using monmaptool
- Set noout flag
- Stop all OSDs
- Inject new monmap
- Stop MONs
- Make sure IPv6 is fixed on MONs
- Start MONs
- Start OSDs
Again, this is from the top of my head, haven't tried it, but something like that should probably work.
Wido
>
> Best regards,
>
> George V.
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I think you could configure all of your mons, osds and clients as dual-stack (both IPv4 and IPv6) in advance.
Once you have confirmed IPv6 connectivity everywhere, add a new mon using its IPv6 address.
You would then replace each mon one by one with IPv6 addressed mons.
You can then start to deconfigure the IPv4 interfaces.
Just a thought
Jake
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