Xen users - May 2006 - Installing CentOS 4.3 Guest OS

I''ve been struggling to figure out how to install a CentOS 4.3 guest
OS on top of my Xen-enabled FC5.  I''ve already gotten a good guest FC5
installed but can''t get CentOS going.  My first attempt was to use the
rpmstrap approach which seemed terribly dated.  Then, I went to the
FC4 documentation approach of running yum to install the CentOS os
inside a filesystem image.  This worked and now I''m trying to start my
new domain which fails.

Here''s my xen configuration:

[root@db4 ~]# cat /etc/xen/xendomain2
# Automatically generated xen config file
kernel ="/boot/vmlinuz-2.6.16-1.2122_FC5xenU"
memory = "256"
name = "xendomain2"
disk = [ ''file:/home/xen/xendomain2,sda1,w'' ]
root = "/dev/sda1"
extra = "ro selinux=0 3"

And the kernel I''m running:

[root@db4 ~]# rpm -q kernel-xenU
kernel-xenU-2.6.16-1.2122_FC5

And here''s what happens when I try to start xendomain2:

[root@db4 ~]# xm create -c xendomain2
Using config file "/etc/xen/xendomain2".
Error: Device 2049 (vbd) could not be connected. Hotplug scripts not working.

Any help or pointers appreciated.

Thanks.

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Am Mittwoch, den 24.05.2006, 17:40 -0700 schrieb Demetri
Mouratis:
> I''ve been struggling to figure out how to install a CentOS 4.3
guest
> OS on top of my Xen-enabled FC5. I''ve already gotten a good guest
FC5
> installed but can''t get CentOS going.  My first attempt was to use
the
> rpmstrap approach which seemed terribly dated.  Then, I went to the
> FC4 documentation approach of running yum to install the CentOS os
> inside a filesystem image. This worked and now I''m trying to start
my
> new domain which fails.
> 
> Here''s my xen configuration:
> 
> [root@db4 ~]# cat /etc/xen/xendomain2
> # Automatically generated xen config file
> kernel ="/boot/vmlinuz-2.6.16-1.2122_FC5xenU"
> memory = "256"
> name = "xendomain2"
> disk = [ ''file:/home/xen/xendomain2,sda1,w'' ]
> root = "/dev/sda1"
> extra = "ro selinux=0 3"
> 
> And the kernel I''m running:
> 
> [root@db4 ~]# rpm -q kernel-xenU
> kernel-xenU-2.6.16-1.2122_FC5
> 
> And here''s what happens when I try to start xendomain2:
> 
> [root@db4 ~]# xm create -c xendomain2
> Using config file "/etc/xen/xendomain2".
> Error: Device 2049 (vbd) could not be connected. Hotplug scripts not
working.
Seems not to be related to CentOS.

Can you loop-mount the file "/home/xen/xendomain2" (_is_ it a file?)
and
chroot into it?

Did you look into the xen logfiles (for xen2 it''s /var/log/xend.log,
don''t know xen3)?

/nils.

btw: did you copy the xenU kernel modules into the domU filesystem?


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On 5/24/06, Demetri Mouratis <dmourati.xen.users@gmail.com>
wrote:
>
> And here''s what happens when I try to start xendomain2:
>
> [root@db4 ~]# xm create -c xendomain2
> Using config file "/etc/xen/xendomain2".
> Error: Device 2049 (vbd) could not be connected. Hotplug scripts not
working.

Have you tried loading the loop module like so:

modprobe loop

_Eric

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Thanks for the replies.  I agree the problem is not a CentOS problem
per se.  I''ve started my Xen experimentation with Fedora Core 5 which
provides a script to setup domU''s for you so this is my first attempt
to go from scratch and it has been difficult to find good docs out
there.

[root@db4 ~]# mount -o loop /home/xen/xendomain2 /mnt/disk/
[root@db4 ~]# chroot /mnt/disk/
bash-3.00# ls
bin   dev  home    lib         media  mnt  proc  sbin     srv  tmp  var
boot  etc  initrd  lost+found  misc   opt  root  selinux  sys  usr

That works just fine.

The /var/log/xend.log is below.

I didn''t copy any xenU kernel modules into domU. What exactly is
required there?

Modprobe loop didn''t seem to help.

[2006-05-25 10:10:47 xend.XendDomainInfo] DEBUG (XendDomainInfo:179)
XendDomainInfo.create([''vm'', [''name'',
''xendomain2''], [''memory'',
''256''], [''vcpus'', 1],
[''image'', [''linux'',
[''kernel'',
''/boot/vmlinuz-2.6.16-1.2122_FC5xenU''],
[''root'', ''/dev/sda1''],
[''args'', ''ro selinux=0 3'']]],
[''device'', [''vbd'',
[''uname'',
''file:/home/xen/xendomain2''], [''dev'',
''sda1''], [''mode'', ''w'']]]])
[2006-05-25 10:10:47 xend.XendDomainInfo] DEBUG (XendDomainInfo:285)
parseConfig: config is [''vm'', [''name'',
''xendomain2''], [''memory'',
''256''], [''vcpus'', 1],
[''image'', [''linux'',
[''kernel'',
''/boot/vmlinuz-2.6.16-1.2122_FC5xenU''],
[''root'', ''/dev/sda1''],
[''args'', ''ro selinux=0 3'']]],
[''device'', [''vbd'',
[''uname'',
''file:/home/xen/xendomain2''], [''dev'',
''sda1''], [''mode'', ''w'']]]]
[2006-05-25 10:10:47 xend.XendDomainInfo] DEBUG (XendDomainInfo:381)
parseConfig: result is {''ssidref'': None,
''uuid'': None, ''on_crash'':
None, ''on_reboot'': None, ''image'':
[''linux'', [''kernel'',
''/boot/vmlinuz-2.6.16-1.2122_FC5xenU''],
[''root'', ''/dev/sda1''],
[''args'', ''ro selinux=0 3'']],
''on_poweroff'': None, ''cpus'': None,
''name'': ''xendomain2'',
''backend'': [], ''vcpus'': 1,
''cpu_weight'': None,
''features'': None, ''vcpu_avail'': None,
''memory'': 256, ''device'':
[(''vbd'', [''vbd'', [''uname'',
''file:/home/xen/xendomain2''], [''dev'',
''sda1''], [''mode'', ''w'']])],
''bootloader'': None, ''cpu'': None,
''maxmem'':
None}
[2006-05-25 10:10:47 xend.XendDomainInfo] DEBUG (XendDomainInfo:1169)
XendDomainInfo.construct: None 0
[2006-05-25 10:10:47 xend.XendDomainInfo] DEBUG (XendDomainInfo:1201)
XendDomainInfo.initDomain: 33 1.0
[2006-05-25 10:10:47 xend] DEBUG (balloon:126) Balloon: free 1252;
need 257; done.
[2006-05-25 10:10:47 xend] INFO (image:133) buildDomain os=linux dom=33 vcpus=1
[2006-05-25 10:10:47 xend] DEBUG (image:171) dom            = 33
[2006-05-25 10:10:47 xend] DEBUG (image:172) image         
/boot/vmlinuz-2.6.16-1.2122_FC5xenU
[2006-05-25 10:10:47 xend] DEBUG (image:173) store_evtchn   = 1
[2006-05-25 10:10:47 xend] DEBUG (image:174) console_evtchn = 2
[2006-05-25 10:10:47 xend] DEBUG (image:175) cmdline        root=/dev/sda1 ro
selinux=0 3
[2006-05-25 10:10:47 xend] DEBUG (image:176) ramdisk        [2006-05-25 10:10:47
xend] DEBUG (image:177) vcpus          = 1
[2006-05-25 10:10:47 xend] DEBUG (image:178) features       [2006-05-25 10:10:47
xend] DEBUG (DevController:103) DevController:
writing {''virtual-device'': ''2049'',
''backend-id'': ''0'',
''state'': ''1'',
''backend'':
''/local/domain/0/backend/vbd/33/2049''} to
/local/domain/33/device/vbd/2049.
[2006-05-25 10:10:47 xend] DEBUG (DevController:105) DevController:
writing {''domain'': ''xendomain2'',
''frontend'':
''/local/domain/33/device/vbd/2049'', ''dev'':
''sda1'', ''state'': ''1'',
''params'': ''/home/xen/xendomain2'',
''mode'': ''w'',
''frontend-id'': ''33'',
''type'': ''file''} to
/local/domain/0/backend/vbd/33/2049.
[2006-05-25 10:10:47 xend.XendDomainInfo] DEBUG (XendDomainInfo:673)
Storing VM details: {''ssidref'': ''0'',
''uuid'':
''714aa89f-5039-d77f-f1a7-62978ab41ee8'',
''on_reboot'': ''restart'',
''start_time'': ''1148577047.2'',
''on_poweroff'': ''destroy'',
''name'':
''xendomain2'', ''vcpus'':
''1'', ''vcpu_avail'': ''1'',
''memory'': ''256'',
''on_crash'': ''restart'',
''image'': "(linux (kernel
/boot/vmlinuz-2.6.16-1.2122_FC5xenU) (root /dev/sda1) (args ''ro
selinux=0 3''))", ''maxmem'':
''256''}
[2006-05-25 10:10:47 xend.XendDomainInfo] DEBUG (XendDomainInfo:698)
Storing domain details: {''console/ring-ref'':
''370492'', ''console/port'':
''2'', ''name'': ''xendomain2'',
''console/limit'': ''1048576'',
''vm'':
''/vm/714aa89f-5039-d77f-f1a7-62978ab41ee8'',
''domid'': ''33'',
''cpu/0/availability'': ''online'',
''memory/target'': ''262144'',
''store/ring-ref'': ''370493'',
''store/port'': ''1''}
[2006-05-25 10:10:47 xend.XendDomainInfo] DEBUG (XendDomainInfo:882)
XendDomainInfo.handleShutdownWatch
[2006-05-25 10:10:47 xend] DEBUG (DevController:132) Waiting for devices vif.
[2006-05-25 10:10:47 xend] DEBUG (DevController:132) Waiting for devices usb.
[2006-05-25 10:10:47 xend] DEBUG (DevController:132) Waiting for devices vbd.
[2006-05-25 10:10:47 xend] DEBUG (DevController:138) Waiting for 2049.
[2006-05-25 10:10:47 xend] DEBUG (DevController:403)
hotplugStatusCallback
/local/domain/0/backend/vbd/33/2049/hotplug-status.
[2006-05-25 10:10:57 xend.XendDomainInfo] DEBUG (XendDomainInfo:1343)
XendDomainInfo.destroy: domid=33
[2006-05-25 10:10:57 xend.XendDomainInfo] DEBUG (XendDomainInfo:1351)
XendDomainInfo.destroyDomain(33)

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