On Wed, Oct 8, 2014 at 2:35 AM, Ilya Dryomov <ilya.dryomov@xxxxxxxxxxx> wrote:
On Wed, Oct 8, 2014 at 2:19 AM, Shawn Edwards <lesser.evil@xxxxxxxxx> wrote:
> Are there any docs on what is possible by writing/reading from the rbd
> driver's sysfs paths? Is it documented anywhere?
>
> I've seen at least one blog post:
> http://www.sebastien-han.fr/blog/2012/06/24/use-rbd-on-a-client/ about how
> you can attach to an rbd using the sysfs interface, but I haven't found much
> else.
It's in the kernel tree, Documentation/ABI/testing/sysfs-bus-rbd.
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/ABI/testing/sysfs-bus-rbd
But keep in mind that rbd map and rbd unmap commands exist for a reason
and do a bit more than just writing stuff into sysfs. If you are
concerned about fetching tons of packages, I think there is work
underway to fix the packaging so that there is a relatively small
package containing just rbd binary and ceph mount helpers that can be
installed.
That's the problem I'm running into, where I need the rbd command on a machine which has horribly old tools but a modern kernel. Is the simple-rbd-install effort somewhere I could see/help? I could see this as being very interesting to folks.
>
> A broader question: what is possible as far as communicating with ceph using
> just the libceph and rbd kernel drivers?
There is no way to use libceph directly. Using libceph+rbd you get an
rbd client, using libceph+ceph you get a cephfs client. libceph is
essentially a library where auth, crush, messenger, parts of objecter
and mon and osd clients are implemented.
Thanks,
Ilya
Shawn Edwards
Beware programmers with screwdrivers. They tend to spill them on their keyboards.
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