Open Stack

2011/9/27 Rogério Vinhal Nunes <rogervn at dcc.ufmg.br>:
> Hello, I've upgraded to Diablo to see if this issue was resolved, but
> apparently it isn't.
>
> There is already a thread talking about it, but it didn't come to a solution
> that I could use. After having Openstack configured with Xen and libvirt in
> Ubuntu 10.04 whenever I run an instance it is started, but it stops with a
> kernel panic trying to mount root by using xvda, but sda is the only
> available.
>
> I'm using Diablo's nova + glance and the
> ubuntu1010-UEC-localuser-image.tar.gz from the manual.
>
> The kernel panic is like this:
>
> [    0.170563] VFS: Cannot open root device "xvda" or unknown-block(0,0)
> [    0.170572] Please append a correct "root=" boot option; here are the
> available partitions:
> [    0.170585] ca00           32768 sda driver: vbd
> [    0.170594] Kernel panic - not syncing: VFS: Unable to mount root fs on
> unknown-block(0,0)
> [    0.170604] Pid: 1, comm: swapper Not tainted 2.6.35-24-virtual
> #42-Ubuntu
>
> I've played with libvirt.xml.template, it changed a lot since Cactus, so I
> tried to replace xvda with sda, and the kernel panic didn't go away, just
> changed a little:
>
> [    0.161237] List of all partitions:
> [    0.161248] ca00           32768 sda driver: vbd
> [    0.161257] No filesystem could mount root, tried:  ext3 ext2 ext4
> fuseblk
> [    0.161275] Kernel panic - not syncing: VFS: Unable to mount root fs on
> unknown-block(202,0)
> [    0.161286] Pid: 1, comm: swapper Not tainted 2.6.35-24-virtual
> #42-Ubuntu
>

Are you able to start a guest manually with Xen + libvirt (without OpenStack)?

That's the first step to debugging this issue.

> I've tried using --xenapi_remap_vbd_dev=true, but it didn't work (it
> wouldn't also because I'm using libvirt, not xenapi).
>

Would XCP or XenServer work for you in general? (The XenAPI-based
hypervisors are more tested and even have more features compared with
libvirt - http://wiki.openstack.org/XenAPI)


Or even Project Kronos (also uses XCP/XenServer toolstack)
http://blog.xen.org/index.php/2011/07/22/project-kronos/

Thanks,
Todd

-- 
Todd Deshane
http://www.linkedin.com/in/deshantm
http://www.xen.org/products/cloudxen.html
http://runningxen.com/