Re: booting from a CEPH rbd or CEPH filesystem

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This isn't a topic I know a ton about, but:
It is not possible to boot from CephFS, but will be soon (search for
"[PATCH 1/4] init: Add a new root device option, the Ceph file
system").
I think it is possible to boot from rbd (there is native kernel
support for it as a block device, for starters), but I'm not entirely
sure of the process. I think it involves <monte carlo> netboot and
initrd setups?</monte carlo>
-Greg
Software Engineer #42 @ http://inktank.com | http://ceph.com


On Mon, Jan 27, 2014 at 7:37 PM, Schlacta, Christ <aarcane@xxxxxxxxxxx> wrote:
> Has anyone done the work to boot a machine (physical or virtual) from a CEPH
> filesystem or RBD?
>
> I'm very interested in this, as I have several systems that don't need a LOT
> of disk throughput and have PLENTY of network bandwidth unused, making them
> primary candidates for such a setup.  I thought about passing the RBDs
> through iscsi, since it's a slightly better documented protocol for booting,
> but that would either require the complexities of multipath, or would
> introduce an inconvenient single point of failure to the system.  Part of
> the idea is that RBDs will still be available if one or more members of the
> cluster goes down.  iscsi doesn't provide that.
>
> I found a guide for booting from rbds on XEN domu on gentoo, but it was very
> vague as to what configuration actually needed to be done, and just sorta
> said it would work.  In the light of the lack of information, I worry 1)
> that the configuration is XEN specific, and depends on the shared kernel, 2)
> that the configuration is Gentoo or even site specific, as I didn't explore
> the site too well.  Here's the article:
> http://www.mad-hacking.net/documentation/linux/ha-cluster/storage-area-network/ceph-xen-domu.xml
>
> Also, I'm using primarily Debian on the server side, and ubuntu for these
> satellite systems, if that in any way effects your knowledge or my abilities
>
>
>
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