Hi,
> We can test this, but just a couple of lines of input might be needed to get
> us going with this without digging through all the code.
Ok, so I added proper argument parsing (using the same format as the
qemu rbd driver) now, so it's easier to test.
First off, you need a working blktap setup for your distribution.
So for example, you should be able to use
"tap2:tapdisk:aio:/path/to/image.raw" as a vbd.
Starting for there you need to :
- Download and compile the rbd branch of git://github.com/smunaut/blktap.git
You will need the ceph development files/packages for this ( for
debian librados-dev librbd-dev )
$ git clone git://github.com/smunaut/blktap.git
$ cd blktap
$ git checkout -b rbd origin/rbd
$ ./autogen.sh
$ ./configure
$ make
- Replace the installed tapdisk binary with the new one
$ sudo cp ./drivers/.libs/tapdisk /usr/bin/tapdisk
- Add 'rbd' as supported format in 'xm'
For some reason 'xm' checks the image format itself before handing
off to the tap-ctl ...
Edit /usr/lib/xen-4.1/lib/python/xen/xend/server/BlktapController.py
and add 'rbd' in the blktap2_disk_types list at the top.
(location of file will vary depending on xen version and distribution)
- Setup a proper /etc/ceph/ceph.conf containing at least the mon addresses
Also make sure you have a /etc/ceph/keyring with the user key if
you use cephx
Once that's done, you should be able to attach disk to a running VM using :
$ xm block-attach test_vm tap2:tapdisk:rbd:rbd/test xvda2 w
"rbd/test" above is the pool_name/image_name
You can add the same options as with the qemu driver.
Cheers,
Sylvain
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