Re: [Qemu-devel] [PATCH] ceph/rbd block driver for qemu-kvm (v8)

[Christian Brunner]

2010/12/6 Kevin Wolf <address@hidden>:

Hi Kevin,

> This lacks a Signed-off-by. Please merge Yehuda's fix for configure when
> you resend the patch.

I've sent an updated patch.

> What's the easiest way to try it out? I tried to use vstart.sh and copy
> the generated ceph.conf to /etc/ceph/ceph.conf so that qemu-img etc.
> find the monitor address. However, that leads to a hang when I try "rbd
> list" or "./qemu-img create -f rbd rbd:data/test.img 4G", so I seem to
> be missing something.

The most simple ceph.conf I can think about, is the following:

[global]
        auth supported = none

[mon]
        mon data = /ceph/mon$id

[mon0]
        host = {hostname}
        mon addr = 127.0.0.1:6789

[osd]
        osd data = /ceph/osd\$id

[osd0]
        host = {hostname}
        btrfs devs = {devicename}


Replace {hostname} with your `hostname -s` and {devicename} with the
name of an empty volume. Create a directory for the monitor and a
mountpoint for the osd volume:

# mkdir -p /ceph/mon0
# mkdir -p /ceph/osd0

After you have created the ceph.conf file, you can create your
ceph-filesystem with the following command (attention - this will
format the configured volume):

# mkcephfs -c /etc/ceph/ceph.conf --mkbtrfs -a

Now you should be able to start ceph (assuming you are using the redhat rpm):

# service ceph start

Check if ceph is running with `ceph -w` or `rados df`. `qemu-img
create -f rbd rbd:data/test.img 4G` should work now, too.

Regards
Christian