Re: Ceph and IPv4 -> IPv6

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> Op 28 juni 2017 om 11:24 schreef george.vasilakakos@xxxxxxxxxx:
> 
> 
> Hey Wido,
> 
> Thanks for your suggestion. It sounds like the process might be feasible but I'd be looking for an "official" thing to do to a production cluster. Something that's documented ceph.com/docs, tested and "endorsed" if you will by the Ceph team.

Honestly I think there aren't that many IPv6 deployments with Ceph out there. I for sure am a big fan a deployer of Ceph+IPv6, but I don't know many around me.

There is probably no automated testing with IPv6 either.

> We could try this on a pre-prod environment but it sounds rather "hacky", as in, there's a number of manual steps involved, including a couple where you're basically manipulating internal, persistent state information.
> 
> I think most people would not be too inclined to do this to their production set ups.
> 

I don't think either. I don't think there is another way then just 'hacky' changing the MONMaps. There have been talks of being able to make Ceph dual-stack, but I don't think there is any code in the source right now.

Wido

> Best regards,
> 
> George
> ________________________________________
> From: Wido den Hollander [wido@xxxxxxxx]
> Sent: 27 June 2017 19:19
> To: Vasilakakos, George (STFC,RAL,SC); ceph-users@xxxxxxxxxxxxxx
> Subject: Re:  Ceph and IPv4 -> IPv6
> 
> > 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.
> > _______________________________________________
> > ceph-users mailing list
> > ceph-users@xxxxxxxxxxxxxx
> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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