Re: [Xen-users] Ubuntu DomU

[Dominic Mason <dominic@xxxxxxxxxx>]

Hi 

This could be because of the grub.cfg on the actual domU, to which the
Ubuntu people have added a Submenu section that pyGrub is unable to
interpret, so you tent to get a "no boot loader found" error

If this is the case, you need to mount the disk image offline - possibly
using kpartx - and comment out the submenu section in the grub.cfg.

This problem will re-appear in your 12.04 domU every time it does a
kernel update and rebuilds grub. So always check you4r grub.cfg before
you do a reboot of the domU as well.

This is something Ubuntu added in 12.04LTS. It's very annoying.


Regards



On Sat, 2014-02-15 at 02:48 +0000, Jonathan Tripathy wrote:
> Hi Everyone,
> 
> I've installed Xen on my CentOs 6 machine using this guide: 
> http://wiki.centos.org/HowTos/Xen/Xen4QuickStart
> 
> So far, most things seem to be working fine. Here is the version of Xen 
> installed:
> 
> release                : 3.10.27-11.el6.centos.alt.x86_64
> version                : #1 SMP Fri Jan 24 23:23:03 UTC 2014
> machine                : x86_64
> nr_cpus                : 4
> nr_nodes               : 1
> cores_per_socket       : 4
> threads_per_core       : 1
> cpu_mhz                : 3192
> hw_caps                : 
> bfebfbff:28100800:00000000:00007f40:77bae3ff:00000000:00000001:00000281
> virt_caps              : hvm_directio
> total_memory           : 32643
> free_memory            : 28827
> free_cpus              : 0
> xen_major              : 4
> xen_minor              : 2
> xen_extra              : .3-27.el6
> xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p
> xen_scheduler          : credit
> xen_pagesize           : 4096
> platform_params        : virt_start=0xffff800000000000
> xen_changeset          : unavailable
> xen_commandline        : dom0_mem=1024M,max:1024M loglvl=all 
> guest_loglvl=all
> cc_compiler            : gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-4)
> cc_compile_by          : mockbuild
> cc_compile_domain      : centos.org
> cc_compile_date        : Fri Jan 24 20:49:25 UTC 2014
> xend_config_format     : 4
> 
> 
> However, when I try to boot my Ubuntu 12.04 DomU (obtained from 
> stacklet), this won't boot. This distro works fine on our other Xen 
> machines which unlike this server, run a Ubuntu Dom0.
> 
> Any ideas? When I try to launch the PV DomU, I see the pygrub screen, 
> and when I hit enter, the DomU just crashes. Nothing appears in any of 
> the DomU logs if I mount the disk to check.
> 
> Help would be appreciated.
> 
> Thanks
> 
> Jonny
> 
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxx
> http://lists.xen.org/xen-users

-- 
Dominic Mason <dominic@xxxxxxxxxx>
OpusVL


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