/proc/xen/balloon ??

General support questions including new installations
ElCapitan
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Joined: 2011/07/25 17:53:03

/proc/xen/balloon ??

Post by ElCapitan » 2011/07/25 18:03:40

Hi,

VBox is not working on CentOS 4.7 because of the pre-existing /proc/xen/balloon file.
I don't even have a Xen kernel available in /boot/, and no Xen packages on the system!

Do you know where this Xen stuff comes from ?!!

Thx.

gerald_clark
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Location: Northern Illinois, USA

/proc/xen/balloon ??

Post by gerald_clark » 2011/07/26 14:36:38

Welcome to CentOS.
New users need to read:
http://www.centos.org/modules/newbb/viewforum.php?forum=47

Is this a VPS?

You have not given enough information to give an answer.
I suggest you follw the directions in the first post.

ElCapitan
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Joined: 2011/07/25 17:53:03

Re: /proc/xen/balloon ??

Post by ElCapitan » 2011/07/27 00:02:01

Hi Gerald,

Information collected by getinfo.sh is pasted [url=http://pastebin.centos.org/37676]here[/url] and [url=http://pastebin.centos.org/37677]here[/url].
(yum "repolist" option not supported, replaced with a "list installed").

This is a physical server (a PowerEdge 1955 Dell blade) with a double Xeon X5365 (8 cores total).

If you need any more info, I'll be happy to provide it.

gerald_clark
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Location: Northern Illinois, USA

Re: /proc/xen/balloon ??

Post by gerald_clark » 2011/07/27 14:47:18

How do you get a /proc/xen/baloon if you are not running a xen kernel?
2.6.9-78.ELsmp i686 i386

ElCapitan
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Re: /proc/xen/balloon ??

Post by ElCapitan » 2011/07/27 16:25:04

[quote]
gerald_clark wrote:
How do you get a /proc/xen/baloon if you are not running a xen kernel?
2.6.9-78.ELsmp i686 i386[/quote]

Thanks for sharing in my amazement.
That's my question exactly!

That balloon thing is "out of the box" on CentOS 4.7!

pschaff
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Re: /proc/xen/balloon ??

Post by pschaff » 2011/07/28 20:21:57

All I can suggest is to update to the current and supported version. CentOS 4.7 is quite old and buggy and you are still running the original kernel. A "yum update" should bring you up to CentOS 4.9 with kernel 2.6.9-101.EL.

ElCapitan
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Re: /proc/xen/balloon ??

Post by ElCapitan » 2011/07/29 06:34:19

I would if I could. For the time being, I have to live with this version (you probably know the drill, so let me spare you)..
No means of disabling this pesky kernel driver? It's useless (no Xen on the system) and just blocks other visualization software.. (what a great idea!)

gerald_clark
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Location: Northern Illinois, USA

Re: /proc/xen/balloon ??

Post by gerald_clark » 2011/07/29 13:26:14

If you can't change what you've got, you will have to live with what you have.

pschaff
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Re: /proc/xen/balloon ??

Post by pschaff » 2011/07/29 14:00:18

[quote]
ElCapitan wrote:
I would if I could. For the time being, I have to live with this version (you probably know the drill, so let me spare you)..[/quote]
Have heard many arguments and rationalizations for staying with obsolete/insecure/buggy versions. Most do not IMHO hold water. They seem to fall into two categories:
1. Vendor A only supports critical application Xyz up through OS version I.J.
2. Management/CIO/IT-Security/PHB has only approved this OS release up through version I.J.

For 1 - many people do not even bother to verify actual compatibility, and given upstream's attention to binary compatibility within a major release chances are good that application Xyz will still work on the current release. It may just be that vendor A has not bothered to test or to update their compatibility information.

For 2 - Sometimes blindness and ignorance are amenable to reason.

[quote]
No means of disabling this pesky kernel driver? It's useless (no Xen on the system) and just blocks other visualization software.. (what a great idea!)[/quote]
Presumably you mean virtualization, and no - if it is part of the kernel and not a module it can probably only be disabled by changing kernels, which you say you can't do.

How about running a modern OS on the bare iron and virtualizing the obsolete release if it can't be updated?

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TrevorH
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Re: /proc/xen/balloon ??

Post by TrevorH » 2011/08/11 23:35:23

There was a bug in one of the RH kernels around 2 or 3 years ago that had it create /proc/xen/balloon on bare metal without using the xen kernel. It was fixed in a subsequent errata. Yep... https://bugzilla.redhat.com/show_bug.cgi?id=470525 in your kernel version and fixed in the next.

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