Xen users - Jul 2010 - /dev/hvc0: No such file or directory

Hi Everyone,

In the guest image I download from stacklet, a Ubuntu 10.04 x86_64 DomU, 
in /var/log/auth.log, I see:

/dev/hvc0: No such file or directory

listed a lot of times. I''m not experiencing any problems, however it 
makes looking through logs for auditing purposes a bit annoying.

Any ideas what this is? I think it has something to do with the 
"Hypervisor Console", whatever that is?

Could it be a security risk at all? As this error would also appear on 
VPSs hosted out to customers.

Thanks

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On Sun, Jul 18, 2010 at 8:59 AM, Jonathan Tripathy
<jonnyt@abpni.co.uk>wrote:
> Hi Everyone,
>
> In the guest image I download from stacklet, a Ubuntu 10.04 x86_64 DomU, in
> /var/log/auth.log, I see:
>
> /dev/hvc0: No such file or directory
>
> listed a lot of times. I''m not experiencing any problems, however
it makes
> looking through logs for auditing purposes a bit annoying.
>
> Any ideas what this is? I think it has something to do with the
"Hypervisor
> Console", whatever that is?
>
> Could it be a security risk at all? As this error would also appear on VPSs
> hosted out to customers.
>
> Thanks
>
> Do you have ''console=hvc0'' on the kernel command line?
Also, check for /etc/init.hvc0.conf, if it doesn''t exist copy one of
the
other tty*.conf files and modify it to use hvc0.

-Bruce


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d it be a security risk at all? As this error would also appear on VPSs 
hosted out to customers.
>
>
>     Thanks
>
> Do you have ''console=hvc0'' on the kernel command line?
Yep, I do indeed (Came like that from Stacklet). Should I remove this? 
What does it do?
>
> Also, check for /etc/init.hvc0.conf, if it doesn''t exist copy one
of
> the other tty*.conf files and modify it to use hvc0.
>
>

I don''t have that file, but I do have /etc/init/hvc0.conf which looks 
like this:

# hvc0 - getty
#
# This service maintains a getty on hvc0 from the point the system is
# started until it is shut down again.

start on stopped rc RUNLEVEL=[2345]
stop on runlevel [!2345]

respawn
exec /sbin/getty -8 38400 hvc0



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On Sun, Jul 18, 2010 at 9:57 AM, Jonathan Tripathy
<jonnyt@abpni.co.uk>wrote:
>  d it be a security risk at all? As this error would also appear on VPSs
> hosted out to customers.
>
>
>> Thanks
>>
>>  Do you have ''console=hvc0'' on the kernel command
line?
>
>
> Yep, I do indeed (Came like that from Stacklet). Should I remove this? What
> does it do?
>
Nope, leave it, just checking it was there.
>
>
>  Also, check for /etc/init.hvc0.conf, if it doesn''t exist copy one
of the
> other tty*.conf files and modify it to use hvc0.
>
>
>
>
> I don''t have that file, but I do have /etc/init/hvc0.conf which
looks like
> this:
>
> Typo, sorry, this is correct.
> # hvc0 - getty
> #
> # This service maintains a getty on hvc0 from the point the system is
> # started until it is shut down again.
>
> start on stopped rc RUNLEVEL=[2345]
> stop on runlevel [!2345]
>
> respawn
> exec /sbin/getty -8 38400 hvc0
>
>
Where is your domU kernel from?

Check /var/log/xen/* on the dom0 for other clues.

-Bruce


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> Where is your domU kernel from?
The whole Ubuntu DomU disk image was downloaded from Stacklet.com. Not 
entirly sure how he''s put it together, but I know it uses pygrub to
boot up.
>
> Check /var/log/xen/* on the dom0 for other clues.
>
> -Bruce
Don''t see anything wrong there (in xend.log), but then again not really
sure what to look for.

There is nothing actually "wrong" as such with my current system,
except
that annoying message that gets listed a lot on in DomU auth.log. BTW, 
"xm console" for the DomU works fine..

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Hi,

Simply remove /etc/init/hvc0.conf then? And reebot? You should get away 
of the message.

Regards,
Adrian Deac


On 19.07.2010 01:29, Jonathan Tripathy wrote:
>
>> Where is your domU kernel from?
>
> The whole Ubuntu DomU disk image was downloaded from Stacklet.com. Not 
> entirly sure how he''s put it together, but I know it uses pygrub
to
> boot up.
>>
>> Check /var/log/xen/* on the dom0 for other clues.
>>
>> -Bruce
>
> Don''t see anything wrong there (in xend.log), but then again not 
> really sure what to look for.
>
> There is nothing actually "wrong" as such with my current system,
> except that annoying message that gets listed a lot on in DomU 
> auth.log. BTW, "xm console" for the DomU works fine..
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
-- 
Deac Mihai-Adrian

W: www.mikesoftware.com
P: +40-745-256.364, +40-723-85.44.44
F: +40-264-566.033


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10.04 should def have a /dev/hvc0.

Are you actually able to log into the VM?

On 19 July 2010 05:46, Adrian Deac <adydeac@gmail.com> wrote:
> Hi,
>
> Simply remove /etc/init/hvc0.conf then? And reebot? You should get away of
> the message.
>
> Regards,
> Adrian Deac
>
>
>
> On 19.07.2010 01:29, Jonathan Tripathy wrote:
>
>>
>>  Where is your domU kernel from?
>>>
>>
>> The whole Ubuntu DomU disk image was downloaded from Stacklet.com. Not
>> entirly sure how he''s put it together, but I know it uses
pygrub to boot up.
>>
>>>
>>> Check /var/log/xen/* on the dom0 for other clues.
>>>
>>> -Bruce
>>>
>>
>> Don''t see anything wrong there (in xend.log), but then again
not really
>> sure what to look for.
>>
>> There is nothing actually "wrong" as such with my current
system, except
>> that annoying message that gets listed a lot on in DomU auth.log. BTW,
"xm
>> console" for the DomU works fine..
>>
>> _______________________________________________
>> Xen-users mailing list
>> Xen-users@lists.xensource.com
>> http://lists.xensource.com/xen-users
>>
>
> --
> Deac Mihai-Adrian
>
> W: www.mikesoftware.com
> P: +40-745-256.364, +40-723-85.44.44
> F: +40-264-566.033
>
>
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
>

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Yes, I am, however my auth.log and syslog file are full of hvc0 errors.

Can someone please give me the major and min numbers for /dev/hvc0?

Thanks


On 19/07/10 09:46, David Markey wrote:
> 10.04 should def have a /dev/hvc0.
>
> Are you actually able to log into the VM?
>
> On 19 July 2010 05:46, Adrian Deac <adydeac@gmail.com 
> <mailto:adydeac@gmail.com>> wrote:
>
>     Hi,
>
>     Simply remove /etc/init/hvc0.conf then? And reebot? You should get
>     away of the message.
>
>     Regards,
>     Adrian Deac
>
>
>
>     On 19.07.2010 01:29, Jonathan Tripathy wrote:
>
>
>             Where is your domU kernel from?
>
>
>         The whole Ubuntu DomU disk image was downloaded from
>         Stacklet.com. Not entirly sure how he''s put it together,
but I
>         know it uses pygrub to boot up.
>
>
>             Check /var/log/xen/* on the dom0 for other clues.
>
>             -Bruce
>
>
>         Don''t see anything wrong there (in xend.log), but then
again
>         not really sure what to look for.
>
>         There is nothing actually "wrong" as such with my current
>         system, except that annoying message that gets listed a lot on
>         in DomU auth.log. BTW, "xm console" for the DomU works
fine..
>
>         _______________________________________________
>         Xen-users mailing list
>         Xen-users@lists.xensource.com
>         <mailto:Xen-users@lists.xensource.com>
>         http://lists.xensource.com/xen-users
>
>
>     -- 
>     Deac Mihai-Adrian
>
>     W: www.mikesoftware.com <http://www.mikesoftware.com>
>     P: +40-745-256.364, +40-723-85.44.44
>     F: +40-264-566.033
>
>
>
>     _______________________________________________
>     Xen-users mailing list
>     Xen-users@lists.xensource.com
<mailto:Xen-users@lists.xensource.com>
>     http://lists.xensource.com/xen-users
>
>
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users

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