Now that you mention it, I remember those threads on the ML. What happens if you use --yes-i-really-mean-it to do those things and then later you try to map an RBD with an older kernel for CentOS 7.3 or 7.4? Will that mapping fail because of the min-client-version of luminous set on the cluster while allowing CentOS 7.5 clients map RBDs?
On Mon, Sep 10, 2018 at 1:33 PM Ilya Dryomov <idryomov@xxxxxxxxx> wrote:
On Mon, Sep 10, 2018 at 7:19 PM David Turner <drakonstein@xxxxxxxxx> wrote:
>
> I haven't found any mention of this on the ML and Google's results are all about compiling your own kernel to use NBD on CentOS. Is everyone that's using rbd-nbd on CentOS honestly compiling their own kernels for the clients? This feels like something that shouldn't be necessary anymore.
>
> I would like to use the balancer module with upmap, but can't do that with kRBD because even the latest kernels still register as Jewel. What have y'all done to use rbd-nbd on CentOS? I'm hoping I'm missing something and not that I'll need to compile a kernel to use on all of the hosts that I want to map RBDs to.
FWIW upmap is fully supported since 4.13 and RHEL 7.5:
https://www.spinics.net/lists/ceph-users/msg45071.html
http://lists.ceph.com/pipermail/ceph-users-ceph.com/2018-August/029105.html
Thanks,
Ilya
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