RE: [Xen-users] Can not start Guest, receiving errors

["Petersson, Mats" <Mats.Petersson@xxxxxxx>]

> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Octavian Teodorescu
> Sent: 29 May 2007 12:15
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-users] Can not start Guest, receiving errors
> 
> Hi guys,
> 
> I have a CentOS installed on my system (P4- core2duo, sata 
> hard drive). At
> installation I have also installed the Virtualization package which
> installed xen, and made the boot record for xen.
> 
> I realized that I don't have kernel-xen0 and kernel-xenU as I had in
> Fedora (fedora was another unlucky experience with xen). My grub.conf:
> =================
> default=0
> timeout=5
> splashimage=(hd0,0)/boot/grub/splash.xpm.gz
> hiddenmenu
> title CentOS (2.6.18-8.1.4.el5xen)
> root (hd0,0)
> kernel /boot/xen.gz-2.6.18-8.1.4.el5
> module /boot/vmlinuz-2.6.18-8.1.4.el5xen ro root=LABEL=/ rhgb quiet
> module /boot/initrd-2.6.18-8.1.4.el5xen.img
> title CentOS (2.6.18-8.el5xen)
> root (hd0,0)
> kernel /boot/xen.gz-2.6.18-8.el5
> module /boot/vmlinuz-2.6.18-8.el5xen ro root=LABEL=/ rhgb quiet
> module /boot/initrd-2.6.18-8.el5xen.img
> ===========
> The dom0 boots ok, and I didn't had any problems with it. 
> Xend is started.
> 
> I am tring to create a virtual machine (initially I wanted to install
> FreeBSD, but I've read just before posting that can not be
> paravirtualized, so I'll use another version of linux or the same).
> I have the following config file called linux:

Is this supposed to be a para-virtual or a HVM (fully virtualized)
domain - your config file seems a bit like a mix of the two. 

Is this a different config than the one below?
> ------------------
> #kernel = "/boot/vmlinuz-2.6.10-xenU"
> kernel = "/boot/vmlinuz-2.6.18-8.1.4.el5xen"
> 
> # The domain build function. Default is 'linux'.
> builder='linux-test'

As far as I'm aware, the only valid choices here are: "linux",
"hvmbuilder" and (I think) "solaris". You can't introduce your own
"builder" option without many changes to the tools chain involved in
domain creation. 
> 
> memory = 512
> 
> name = "bsd"

Probably not what you wanted, but works OK. 
> 
> # List of which CPUS this domain is allowed to use, default Xen picks
> #cpus = "" # leave to Xen to pick
> #cpus = "0" # all vcpus run on CPU0
> #cpus = "0-3,5,^1" # run on cpus 0,2,3,5
> vcpus = 1
> 
> vif = [ '', 'bridge=xenbr1' ]
> 
> device_model = '/usr/lib64/xen/bin/qemu-dm'

Don't need a device-model if you're not using HVM. 
> 
> disk = [ 'phy:/dev/VGvhosts/root,hda1,w',
> 'phy:/dev/VGvhosts/swap,hda2,w',
> 'phy:/dev/VGvhosts/tmp,hda3,w' ]
> # 'phy:/dev/VGvhosts/var,hda4,w' ]
> 
> dhcp="dhcp"
> 
> # Set root device.
> root = "/dev/hda1"
> 
> 
> cdrom = "/home/admn/iso/6.2-RELEASE-i386-disc1.iso"

Can't boot from CDROM if you're not using HVM. 

> boot = "dc"

Likewise, "boot" and "root" are sort of equivalent for "HVM" and "PV"
domains - they both say where to boot from, "boot" is for HVM domains,
"root" is for "PV" domains (it's passed to the kernel that you're
loading). 
> 
> [root@octavpc1 xen]# mcedit linux
> 
> [root@octavpc1 xen]# cat linux
> #kernel = "/boot/vmlinuz-2.6.10-xenU"
> kernel = "/boot/vmlinuz-2.6.18-8.1.4.el5xen"
> 
> # The domain build function. Default is 'linux'.
> builder='linux'

Correct. 
> 
> memory = 512
> 
> name = "linux-test"

That's better. 
> 
> # List of which CPUS this domain is allowed to use, default Xen picks
> #cpus = "" # leave to Xen to pick
> #cpus = "0" # all vcpus run on CPU0
> #cpus = "0-3,5,^1" # run on cpus 0,2,3,5
> vcpus = 1
> 
> vif = [ '', 'bridge=xenbr1' ]
> 
> device_model = '/usr/lib64/xen/bin/qemu-dm'

Still shouldn't use device-model. 
> 
> disk = [ 'phy:/dev/VGvhosts/root,hda1,w',
> 'phy:/dev/VGvhosts/swap,hda2,w',
> 'phy:/dev/VGvhosts/tmp,hda3,w' ]
> # 'phy:/dev/VGvhosts/var,hda4,w' ]
> 
> dhcp="dhcp"
> 
> # Set root device.
> root = "/dev/hda1"
> 
> 
> cdrom = "/home/admn/iso/6.2-RELEASE-i386-disc1.iso"
> boot = "dc"
And still can't boot from CDROM in PV mode. 
> ----------------------
> 
> 
> When I do a xm create -c linux, I see the vm booting (at 
> least that's what
> I think it's doing) and I receive an error. Here are the last 
> line of what
> I see on my screen:
> ----------------
> Initializing IPsec netlink socket
> NET: Registered protocol family 1
> NET: Registered protocol family 17
> XENBUS: Device with no driver: device/vbd/769
> XENBUS: Device with no driver: device/vbd/770
> XENBUS: Device with no driver: device/vbd/771
> XENBUS: Device with no driver: device/vif/0
> XENBUS: Device with no driver: device/vif/1
> md: Autodetecting RAID arrays.
> md: autorun ...
> md: ... autorun DONE.
> VFS: Cannot open root device "hda1" or unknown-block(0,0)

Does "/dev/hda1" contain a vaild filesystem?

--
Mats
> Please append a correct "root=" boot option
> Kernel panic - not syncing: VFS: Unable to mount root fs on
> unknown-block(0,0)
> 
> 
> If I try to mount the logical volumes, I get:
> --------------------
> Using config file "./linux".
> Error: destroyDevice() takes exactly 3 arguments (2 given)
> ----------------------
> I tried to change from hda to sda, I have also tried sda3 for 
> all of them
> since my disk looks like this:
> sda1 - / -30GB
> sda2 - swap -3,5GB
> sda3 - lvm - 209GB
> On the lvm I have the following partitions formated as ext3: 
> root, var,
> tmp and .... swap.
> 
> I know I have the image of a bsd cd know (I'll make an image 
> of a linux
> and use that instead), but it should at least boot! Right?
> 
> So I tried a lot of Google and couldn't find an answer to my 
> problem. This
> is my first time with xen. Can U please help me?
> 
> Thanks in advance.
> 
> 
> _______________________________________________
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> Xen-users@xxxxxxxxxxxxxxxxxxx
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> 
> 
> 



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