Nabble - Xen - User

Re: how to get xen with a kernel 2.6.27 or above?

2009-12-05T10:27:06Z

On Sat, Dec 5, 2009 at 11:48 PM, secdev geek <secdevgeek@...> wrote:

>> On Fri, Dec 4, 2009 at 9:30 PM, Tapas Mishra <tapas@...> wrote:

> It worked well to the point of compiling and installing. Unfortunately, I
> haven't had enough time to experiment any further (create VMs, configure
> them, etc). I noticed the xenU kernels weren't built though. Do I need to
> build one, if I want to create a VM with Red Hat or SuSE enterprise?
I am not clear on this part I think since when I created Virtual
Machines from the available DVD ISO which were available to me at some
point that failed some where I read that we need to compile DomU
kernel also but then some more experts can be able to help both of us
better.

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Re: Xen.org Community Weekly Update - Dec 4

2009-12-05T10:25:39Z

Hi Stephen,

On Sat, Dec 5, 2009 at 3:52 AM, Stephen Spector <stephen.spector@...> wrote:

· Xen Summit Asia 2009 – All Slides and Videos available at http://www.xen.org/xensummit/xensummit_fall_2009.html

Thanks for this, very good stuff. However, I was a bit deceived when I downloaded the keynote from Keir today. For a 1.2Gb I expected it to be slightly longer session than just 22mins. Perhaps compressing these video files into a more standard format (e.g AVI/DivX/Xdiv, ogg, swf, etc, would be a great idea to save time and bandwidth for us all, including to Citrix.

- SDG

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Re: how to get xen with a kernel 2.6.27 or above?

2009-12-05T10:18:18Z

On Fri, Dec 4, 2009 at 9:38 PM, secdev geek <secdevgeek@...> wrote:

On Fri, Dec 4, 2009 at 9:30 PM, Tapas Mishra <tapas@...> wrote:
Some one explained me in detail on community so I am forwarding same here
This guide will explicate in detail about the procedure for compiling
vanilla kernel from source and customize it according to your hardware
specifications and then compiling latest XEN from source and patching
it with Linux.
First install these packages:

Thank you for the very detailed instructions and for the links. I'll follow it up and see if I can get it working successfully.

It worked well to the point of compiling and installing. Unfortunately, I haven't had enough time to experiment any further (create VMs, configure them, etc). I noticed the xenU kernels weren't built though. Do I need to build one, if I want to create a VM with Red Hat or SuSE enterprise?

- SDG

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Re: how to get xen with a kernel 2.6.27 or above?

2009-12-05T10:13:53Z

On Sat, Dec 5, 2009 at 6:09 PM, Tapas Mishra <tapas@...> wrote:

What about Xen 4 I read about it some where isn't it released ?

On Sat, Dec 5, 2009 at 5:14 PM, Pasi Kärkkäinen <pasik@...> wrote:
> Also note Xen 3.4.2 is the latest stable version now!
>
> -- Pasi
>
>

I just finished watching the video from Keir Fraser that Stephen published on the website from the recent Xen Summit in Asia, and he says that 4.0 will be released in January. I am not yet aware if there is already an "unstable" tree that will possibly translate into 4.0 at some point in the future, but I also seem to understand that before we go into 4.0, a 4.3 stable release will exist, so I suppose 4.0 is scheduled to late January.

- sdg

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Re: how to get xen with a kernel 2.6.27 or above?

2009-12-05T10:09:00Z

What about Xen 4 I read about it some where isn't it released ?

On Sat, Dec 5, 2009 at 5:14 PM, Pasi Kärkkäinen <pasik@...> wrote:

> On Fri, Dec 04, 2009 at 09:38:47PM +0000, secdev geek wrote:
>> On Fri, Dec 4, 2009 at 9:30 PM, Tapas Mishra <[1]tapas@...>
>> wrote:
>>
>> Some one explained me in detail on community so I am forwarding same
>> here
>> This guide will explicate in detail about the procedure for compiling
>> vanilla kernel from source and customize it according to your hardware
>> specifications and then compiling latest XEN from source and patching
>> it with Linux.
>> First install these packages:
>>
>> Thank you for the very detailed instructions and for the links. I'll
>> follow it up and see if I can get it working successfully.
>>
>
> Also note Xen 3.4.2 is the latest stable version now!
>
> -- Pasi
>
>

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PVGrub can't find config file for domU on logical volume

2009-12-05T08:09:59Z

After hours of googling and not really finding a definitive solution to my
problem, I'm a little stuck and would really appreciate some help from
others.

I have a CentOS 5.4 x86-64 server running Xen 3.3 from the gitco repos as
dom0. On this I have created two logical volumes comprising 8GB for the
system disk (xvda) and 1.5GB for swap (xvdb). I ran mkfs.ext3 and mkswap
on these to create the required filesystems and then I mounted the 8GB
volume and copied a system image onto it. After creating the xen config
and starting it with pygrub the machine starts and runs without error - so
far, so good!

Now, If I shutdown the vm and change the config to use pvgrub and restart
I am stuck at a grub prompt. If I manually tell it where to find the
config file (using the exact same path as in the 'extra' line in the domu
config) it pvgrub starts and everything then runs as expected. Here is my
config:

--- snip ---
name = "pvgrubtestvm"
vcpus = 1
memory = 512
maxmem = 512

# pvgrub
kernel = "/usr/lib/xen/boot/pv-grub-x86_64.gz"
extra = "(hd0)/boot/grub/menu.lst"
#end pvgrub

dhcp = "dhcp"

disk = [ "phy:/dev/VolGroupVM/pvgrubtestvm,xvda1,w",
"phy:/dev/VolGroupVM/pvgrubtestvm-swap,xvda2,w" ]

vif = [
"mac=00:16:3e:00:00:09,ip=192.168.1.12,bridge=xenbr0,vifname=vifpvgrubtestvm"
]

on_poweroff = 'destroy'
on_reboot = 'restart'
on_crash = 'restart'
--- snip ---

Have I done something wrong? Is this an issue with pvgrub and logical
volumes - i.e. no partition table?

Many thanks,

Matt.

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Re: Re: Dom0 network restart required

2009-12-05T04:21:00Z

On Sat, Dec 5, 2009 at 1:01 PM, Tanuj Bansal <bansal.tanuj83@...> wrote:
> anyone please help here?

You're being to vague, asking for help but not providing any
additional info. Like the simple ones:
- do you use static IP or DHCP
- which networking setup you use, bridged or routing
- what does your bridge setup looks like (output of "brctl show")
- can dom0 ping the gateway
- can domU ping the gateway

etc, etc. ...

However my guess is your switch/router/gateway simply don't cache your
dom0's arp entry. Next time this happens, try using arping from dom0.
So if your dom0 interface is on eth0, and your gateway is 192.168.10.1
(just an example), you can try running (as root)

arping -b -I eth0 192.168.10.1

--
Fajar

>
>
> On Fri, Dec 4, 2009 at 11:57 AM, Tanuj Bansal <bansal.tanuj83@...>
> wrote:
>>
>> I am using Xen on Para virtualization and sometimes my dom0 having network
>> issue while at the same moment I am able to access all DomU from network.
>>
>> to fix the issue I always restart Dom0 Network and it fixes the issue.
>>
>> Can anyone please let me know the cause of this?

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Re: (re)load new kernel with rebooting host node?

2009-12-05T04:13:59Z

On Sat, Dec 5, 2009 at 2:17 PM, Rudi Ahlers <Rudi@...> wrote:
> But have you, or anyone else, used kexec on a running server yet?

Yes. That's how I was able to tell you how it behaves :D

> And
> how do I use it, without breaking anything?

On Ubuntu, it's part of kexec-tools. It comes with a nice man page. If
I remember correctly, the easy way to use it to modify some config
file so that when you run "init 6" (or similar) it would invoke kexec
(which is faster) instead of normal reboot. The "hard" way to use it
involves specifying manually which kernel image (plus initrd and
command line) that kexec would run.

> Not much. The domU's can't use iptables, at all.
>
> On a domU:
>
> -bash-3.2# iptables -L
> iptables v1.3.5: can't initialize iptables table `filter': iptables
> who? (do you need to insmod?)
> Perhaps iptables or your kernel needs to be upgraded.
>
> And the domU's kernel:
>
> -bash-3.2# uname -a
> Linux spare5.securehosting.co.za 2.6.18-128.7.1.el5xen #1 SMP Mon Aug
> 24 09:14:33 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux
>
>
> The host node's kernel:
>
> root@usaxen02:[~]$ uname -a
> Linux usaxen02.securehosting.co.za 2.6.18-128.7.1.el5xen #1 SMP Mon
> Aug 24 09:14:33 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux

Here's some simple question:
- where is the kernel located? domU or dom0? Do you use pygrub?
- does domU have /lib/modules/2.6.18-128.7.1.el5xen?

My guess is you use the kernel from dom0, but you don't have the
corresponding module directory on domU.

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Re: regarding Xen summit asia curiosity

2009-12-05T03:45:13Z

On Sat, Dec 05, 2009 at 01:51:14PM +0530, Tapas Mishra wrote:
> I browsed http://www.xen.org/xensummit/xensummit_fall_2009.html
> the videos mentioned there are very heavy in size would like to know
> key features in these videos so that I download the one that os most
> relevant to me.
>

Well check the PDF slides first before downloading any videos..

-- Pasi

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Re: how to get xen with a kernel 2.6.27 or above?

2009-12-05T03:44:33Z

On Fri, Dec 04, 2009 at 09:38:47PM +0000, secdev geek wrote:

> On Fri, Dec 4, 2009 at 9:30 PM, Tapas Mishra <[1]tapas@...>
> wrote:
>
> Some one explained me in detail on community so I am forwarding same
> here
> This guide will explicate in detail about the procedure for compiling
> vanilla kernel from source and customize it according to your hardware
> specifications and then compiling latest XEN from source and patching
> it with Linux.
> First install these packages:
>
> Thank you for the very detailed instructions and for the links. I'll
> follow it up and see if I can get it working successfully.
>

Also note Xen 3.4.2 is the latest stable version now!

-- Pasi

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Re: Re: Dom0 network restart required

2009-12-05T01:16:17Z

offloading settings are like this

# ethtool -k eth0
Offload parameters for eth0:
Cannot get device rx csum settings: Operation not supported
Cannot get device udp large send offload settings: Operation not supported
rx-checksumming: off
tx-checksumming: on
scatter-gather: on
tcp segmentation offload: on
udp fragmentation offload: off
generic segmentation offload: off

# ethtool -k peth0
Offload parameters for peth0:
Cannot get device udp large send offload settings: Operation not supported
rx-checksumming: on
tx-checksumming: on
scatter-gather: on
tcp segmentation offload: on
udp fragmentation offload: off
generic segmentation offload: off

On Sat, Dec 5, 2009 at 2:29 PM, Tanuj Bansal <bansal.tanuj83@...> wrote:

I have issue with Dom0 and DomU are working fine.
Hence I checked xen logs and system logs file.

xen logs have no information

Dmesg:

eth0: no IPv6 routers present
usb 4-1.2: reset high speed USB device using ehci_hcd and address 5
eth0: no IPv6 routers present
eth0: no IPv6 routers present

messages:

avahi-daemon[3381]: iface.c: interface_mdns_mcast_join() called but no local address available.
avahi-daemon[3381]: Interface eth0.IPv4 no longer relevant for mDNS.
avahi-daemon[3381]: Withdrawing address record for XXXXX on eth0.
avahi-daemon[3381]: Leaving mDNS multicast group on interface eth0.IPv6 with address XXXXX.
avahi-daemon[3381]: iface.c: interface_mdns_mcast_join() called but no local address available.
avahi-daemon[3381]: Interface eth0.IPv6 no longer relevant for mDNS.
avahi-daemon[3381]: New relevant interface eth0.IPv6 for mDNS.
avahi-daemon[3381]: Joining mDNS multicast group on interface eth0.IPv6 with address XXXXXX.
avahi-daemon[3381]: Registering new address record for XXXXXXX on eth0.
avahi-daemon[3381]: New relevant interface eth0.IPv4 for mDNS.
avahi-daemon[3381]: Joining mDNS multicast group on interface eth0.IPv4 with address yyyyyy.

Regards,
Tanuj

On Sat, Dec 5, 2009 at 1:23 PM, Tapas Mishra <tapas@...> wrote:

can you post a log file entry which clearly describes the error may be
we can have a clue there as what is happening.

On Sat, Dec 5, 2009 at 11:31 AM, Tanuj Bansal <bansal.tanuj83@...> wrote:
> anyone please help here?
>
>
> On Fri, Dec 4, 2009 at 11:57 AM, Tanuj Bansal <bansal.tanuj83@...>
> wrote:
>>
>> I am using Xen on Para virtualization and sometimes my dom0 having network
>> issue while at the same moment I am able to access all DomU from network.
>>

>> to fix the issued I always restart Dom0 Network and it fixes the issue.

>>
>> Can anyone please let me know the cause of this?
>>
>>
>> Regards,
>>
>> Tanuj
>

> _______________________________________________
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> Xen-users@...
> http://lists.xensource.com/xen-users
>

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Re: Re: Dom0 network restart required

2009-12-05T00:59:31Z

I have issue with Dom0 and DomU are working fine.
Hence I checked xen logs and system logs file.

xen logs have no information

Dmesg:

eth0: no IPv6 routers present
usb 4-1.2: reset high speed USB device using ehci_hcd and address 5
eth0: no IPv6 routers present
eth0: no IPv6 routers present

messages:

avahi-daemon[3381]: iface.c: interface_mdns_mcast_join() called but no local address available.
avahi-daemon[3381]: Interface eth0.IPv4 no longer relevant for mDNS.
avahi-daemon[3381]: Withdrawing address record for XXXXX on eth0.
avahi-daemon[3381]: Leaving mDNS multicast group on interface eth0.IPv6 with address XXXXX.
avahi-daemon[3381]: iface.c: interface_mdns_mcast_join() called but no local address available.
avahi-daemon[3381]: Interface eth0.IPv6 no longer relevant for mDNS.
avahi-daemon[3381]: New relevant interface eth0.IPv6 for mDNS.
avahi-daemon[3381]: Joining mDNS multicast group on interface eth0.IPv6 with address XXXXXX.
avahi-daemon[3381]: Registering new address record for XXXXXXX on eth0.
avahi-daemon[3381]: New relevant interface eth0.IPv4 for mDNS.
avahi-daemon[3381]: Joining mDNS multicast group on interface eth0.IPv4 with address yyyyyy.

Regards,
Tanuj

On Sat, Dec 5, 2009 at 1:23 PM, Tapas Mishra <tapas@...> wrote:

can you post a log file entry which clearly describes the error may be
we can have a clue there as what is happening.

On Sat, Dec 5, 2009 at 11:31 AM, Tanuj Bansal <bansal.tanuj83@...> wrote:
> anyone please help here?
>
>
> On Fri, Dec 4, 2009 at 11:57 AM, Tanuj Bansal <bansal.tanuj83@...>
> wrote:
>>
>> I am using Xen on Para virtualization and sometimes my dom0 having network
>> issue while at the same moment I am able to access all DomU from network.
>>

>> to fix the issued I always restart Dom0 Network and it fixes the issue.

>>
>> Can anyone please let me know the cause of this?
>>
>>
>> Regards,
>>
>> Tanuj
>

> _______________________________________________
> Xen-users mailing list
> Xen-users@...
> http://lists.xensource.com/xen-users
>

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Dom0 kernel for Embedded System

2009-12-05T00:55:18Z

I am doing an experiment in which I want to run Dom0 kernel on an
embedded device for which I would like the kernel to have only some
specific module and kernel provide certain specific service,what can
be a good start for this.

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regarding Xen summit asia curiosity

2009-12-05T00:21:14Z

I browsed http://www.xen.org/xensummit/xensummit_fall_2009.html
the videos mentioned there are very heavy in size would like to know
key features in these videos so that I download the one that os most
relevant to me.

--

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Re: Re: Dom0 network restart required

2009-12-04T23:53:18Z

can you post a log file entry which clearly describes the error may be
we can have a clue there as what is happening.
On Sat, Dec 5, 2009 at 11:31 AM, Tanuj Bansal <bansal.tanuj83@...> wrote:

> anyone please help here?
>
>
> On Fri, Dec 4, 2009 at 11:57 AM, Tanuj Bansal <bansal.tanuj83@...>
> wrote:
>>
>> I am using Xen on Para virtualization and sometimes my dom0 having network
>> issue while at the same moment I am able to access all DomU from network.
>>
>> to fix the issued I always restart Dom0 Network and it fixes the issue.
>>
>> Can anyone please let me know the cause of this?
>>
>>
>> Regards,
>>
>> Tanuj
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@...
> http://lists.xensource.com/xen-users
>

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Re: (re)load new kernel with rebooting host node?

2009-12-04T23:17:24Z

On Fri, Dec 4, 2009 at 11:04 PM, Fajar A. Nugraha <fajar@...> wrote:
> On Thu, Dec 3, 2009 at 2:02 AM, Rudi Ahlers <Rudi@...> wrote:
>> I know kexec can do something like
>> this for security patches, but I don't know much about kexec, and I
>> don't want to mess up a production server either.
>
> AFAIK current implementation of kexec works like a reboot, only
> without going through BIOS and bootloader. At least that's how it was
> implemented in Ubuntu

But have you, or anyone else, used kexec on a running server yet? And
how do I use it, without breaking anything?

>
>> So, has anyone done
>> something like this before? I need to load a new kernel for one of the
>> domU's iptables to work, but don't want to reboot the whole server and
>> cause downtime for the other domU's.
>
> You shouldn't need to that. What changes did you made on dom0? My
> setup works fine with iptables on domU in a mostly-default setup.
>

Not much. The domU's can't use iptables, at all.

On a domU:

-bash-3.2# iptables -L
iptables v1.3.5: can't initialize iptables table `filter': iptables
who? (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.

And the domU's kernel:

-bash-3.2# uname -a
Linux spare5.securehosting.co.za 2.6.18-128.7.1.el5xen #1 SMP Mon Aug
24 09:14:33 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux

The host node's kernel:

root@usaxen02:[~]$ uname -a
Linux usaxen02.securehosting.co.za 2.6.18-128.7.1.el5xen #1 SMP Mon
Aug 24 09:14:33 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux

So, I thought of upgrading the kernel on both, and see if that helps at all?

> --
> Fajar
>
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>

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Web: http://www.SoftDux.com
Office: 087 805 9573
Cell: 082 554 7532

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Re: Dom0 network restart required

2009-12-04T22:01:47Z

anyone please help here?

On Fri, Dec 4, 2009 at 11:57 AM, Tanuj Bansal <bansal.tanuj83@...> wrote:

I am using Xen on Para virtualization and sometimes my dom0 having network issue while at the same moment I am able to access all DomU from network.

to fix the issue I always restart Dom0 Network and it fixes the issue.

Can anyone please let me know the cause of this?

Regards,

Tanuj

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Re: UnknownHostException on Xen Guest OS

2009-12-04T21:57:51Z

Yes, that is true. thx. I have modified the etc/hosts, and the prob solved.

richard

On Fri, Dec 4, 2009 at 11:56 PM, Fajar A. Nugraha <fajar@...> wrote:

On Sat, Dec 5, 2009 at 11:52 AM, Yuzhe Tang <tristartom@...> wrote:
> Hi,
> I have successfully installed Xen on a desktop, and now running two Ubuntu
> as guest os on Xen. However, it has some problems on hostNames.

How do you install Ubuntu?
Generally you need to configure it the same way you do on normal
system. Check things like /etc/resolv.conf, /etc/hostname, /etc/hosts

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Re: UnknownHostException on Xen Guest OS

2009-12-04T20:56:45Z

On Sat, Dec 5, 2009 at 11:52 AM, Yuzhe Tang <tristartom@...> wrote:
> Hi,
> I have successfully installed Xen on a desktop, and now running two Ubuntu
> as guest os on Xen. However, it has some problems on hostNames.

How do you install Ubuntu?
Generally you need to configure it the same way you do on normal
system. Check things like /etc/resolv.conf, /etc/hostname, /etc/hosts

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UnknownHostException on Xen Guest OS

2009-12-04T20:52:38Z

Hi,
I have successfully installed Xen on a desktop, and now running two Ubuntu as guest os on Xen. However, it has some problems on hostNames. I have written a test java file, as follows

A.java

import java.net.InetAddress;
class A
{
public static void main(String[] args)
{
try
{
String hostName = InetAddress.getLocalHost().getHostName();
System.out.println(hostName);
} catch(Exception e) {
e.printStackTrace();
}
}
}

And java.net.UnknownHostException is thrown. I would like to know how I can configure the guest os to avoid this error? Does anyone have same experiences here? I appreciate it if s/he could share w me. thanks

Richard

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Re: Can't boot into xen

2009-12-04T20:36:59Z

On Sat, Dec 5, 2009 at 5:59 AM, Robert Miesen <robert.miesen@...> wrote:
> Yes, the normal, non-xen kernels all work just fine.
>
> I can now see why you are recommending RHEL / Centros 5.4 (I'm assuming
> Fedora core would work too).

Not really :D
Fedora dom0 support ended a long time ago (F8, I think, which is now
EOL) and support for newer dom0 kernels in Fedora is still considered
experimental.

Two Linux distros that I know of with Xen dom0 support are RHEL/Centos
and Suse/Opensuse.

> In that case, what purpose does a GNU/Linux
> installation serve for dom0? Does a dom0 instance just need a xen kernel of
> some sort or does the dom0 instance act more like a "normal" GNU/Linux
> distribution installation?

Here's some oversimplification:

Xen, the hypervisor, manage CPU and memory allocation between all
running domains.

dom0 provides I/O access (disk, network, etc.) for itself and other
running domUs. It consists of kernel with xen dom0 support (xenified
or pv_ops), and the normal libraries and programs that comes with
standard installation. It behaves mostly like a normal installation,
with the main difference that it doesn't have access to all CPU and
memory. dom0 can be Linux, Opensolaris, or *BSD.

xen userland tools (e.g. xm) basically controls the hypervisor and
dom0, telling it stuff like "you need to provide this much resource to
this domain"

A functional Xen installation needs all three components.

>
> Since I'm so new to xen, could you also give me a recommended partition
> setup for a system that will run virtualized instances of both Windows XP
> and Debian GNU/Linux? Are there any other resources you would recommend I
> look into?

For normal uses, any partition setup would do just fine. If you want
high disk I/O performance though, you should use LVM setup, leaving
some unused space for domU storage.

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Xen.org Community Weekly Update - Dec 4

2009-12-04T19:52:47Z

Time again for the weekly update:

· Xen Summit Asia 2009 – All Slides and Videos available at http://www.xen.org/xensummit/xensummit_fall_2009.html

· Xen 4.0 Release Information - http://blog.xen.org/index.php/2009/12/02/xen-4-0-release-information/

· Amazing number of patches for xen-devel and xen-api

Full update at http://wiki.xensource.com/xenwiki/XenUpdate20091204

Stephen Spector

Xen.org Community Manager

T: (772) 621-5062 | F: (772) 365-0338 | M: (954) 854-4257

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Re: Can't boot into xen

2009-12-04T13:51:40Z

On Sat, Dec 5, 2009 at 4:38 AM, Robert Miesen <robert.miesen@...> wrote:
> No, I haven't tried running RHEL/Centos 5.4. Even if using one of these
> distributions, I would much rather figure out exactly why xen is not working
> so I can stick with a Debian distribution (or derivatives).

I assume normal, non-xen kernel works fine?
The thing is, the state of kernels > 2.6.18 (including current
Debian/Ubuntu kernel) is not as well-tested as 2.6.18. AFAIK only Suse
officially supports dom0 kernel with 2.6.31. So my guess is you hit a
bug that exists in newer kernel.

The reason I suggest RHEL is because they actively maintain their
2.6.18 kernel, backporting drivers and bugfixes. So it'd be much
easier for you to start with that. Once you have it working, you can
easily use Redhat kernel on Debian if you want, or start compiling
your own kernel.

--
Fajar

>
> On Fri, Dec 4, 2009 at 1:14 PM, Fajar A. Nugraha <fajar@...> wrote:
>>
>> On Sat, Dec 5, 2009 at 12:56 AM, Robert Miesen <robert.miesen@...>
>> wrote:
>> > The same problem happens both when trying a native installation of
>> > xen and when trying to boot from the xen live CD.
>>
>> Did you try installing RHEL/Centos 5.4? It should work for most
>> hardware, and has Xen built in.

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Re: how to get xen with a kernel 2.6.27 or above?

2009-12-04T13:38:47Z

On Fri, Dec 4, 2009 at 9:30 PM, Tapas Mishra <tapas@...> wrote:

Some one explained me in detail on community so I am forwarding same here
This guide will explicate in detail about the procedure for compiling
vanilla kernel from source and customize it according to your hardware
specifications and then compiling latest XEN from source and patching
it with Linux.
First install these packages:

Thank you for the very detailed instructions and for the links. I'll follow it up and see if I can get it working successfully.

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Re: how to get xen with a kernel 2.6.27 or above?

2009-12-04T13:30:26Z

Some one explained me in detail on community so I am forwarding same here
This guide will explicate in detail about the procedure for compiling
vanilla kernel from source and customize it according to your hardware
specifications and then compiling latest XEN from source and patching
it with Linux.
First install these packages:

sudo apt-get install iproute bridge-utils gcc make gettext
sudo apt-get install libcurl4-openssl-dev è openssl problem resolved
sudo apt-get install python-dev zlib1g-dev bcc libsdl-dev pciutils-dev
è zlib problem resolved.

First we will compile latest XEN Hypervisor from source.

Go to http://www.xen.org/products/xen_source.html and download the
latest XEN hypervisor from there. [Version 3.4.1 at the time of
writing the guide]
Xen 3.4.1 is available WITH and WITHOUT 2.6.18 dom0 kernel. We need
the version without dom0 linux because we will compile our own vanilla
kernel.
I am seting up XEN 3.4.1 on amd64 hardware and running debian
distribution on it with upgraded kernel.
My hardware specifications:
unme -a
Linux -04 2.6.31.4-user-kvm-vanilla #1 SMP Wed Oct 21 16:35:11 BST
2009 x86_64 GNU/Linux
Build / Install Xen

1. mkdir /home/tapas/xen
2. cd /home/tapas/xen
3. tar -xzf xen-3.4.1
4. cd xen-3.4.1
5. make xen
6. make install-xen
7. make tools
8. make install-tools

Build Vanilla kernel
Now we will build th PV_Ops Kernel. The Vanilla kernel source will be
downloaded from Jeremy's tree. Jeremy's git tree on kernel.org
contains the pv_ops dom0 patches. If we use Jeremy's tree then we do
not any extra patches to bind XEN with kernel source.

1. mkdir /home/tapas/linux
2. cd /home/tapas/linux
3. git clone git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git
4. linux-2.6-xen
5. cd linux-2.6-xen
6. git checkout origin/xen/master -b xen/master
7. make menuconfig [see Note below]
8. make-kpkg clean
9. CONCURRENCY_LEVEL=N fakeroot make-kpkg --initrd
--append-to-version=-custom kernel_image kernel_headers
10. This will make the debian packages in the parent directory which
you can install

Note: Please choose the following xen specific optiions in kernel configuration.

Processor type and features ---> Subarchitecture Type (PC-compatible)
---> (X) Enable Xen compatible kernel
Bus options (PCI etc.) ---> [*] PCI support
[*] Xen PCI Frontend
[ ] Xen PCI Frontend
Debugging (NEW)
Device Drivers ---> XEN ---> [*] Privileged Guest (domain 0)
<*> Backend driver support (NEW)
<*> Block-device
backend driver (NEW)
<*> Block-device tap
backend driver (NEW)
<*> Network-device
backend driver (NEW)
(8) Maximum
simultaneous transmit requests (as a power of 2) (NEW)
[ ] Pipelined
transmitter (DANGEROUS) (NEW)
< > Network-device
loopback driver (NEW)
<*> PCI-device
backend driver (NEW)
PCI Backend
Mode (Virtual PCI) --->
[ ] PCI
Backend Debugging (NEW)
< >
TPM-device backend driver (NEW)
<M> SCSI backend driver (NEW)
< > TPM-device backend driver (NEW)
<M> SCSI backend driver (NEW)
<M> Block-device frontend driver
<M> Network-device frontend driver
<M> Network-device frontend driver
acceleration for Solarflare NICs (NEW)
<M> SCSI frontend driver (NEW)
<*> User-space granted page access driver (NEW)
<*> Framebuffer-device frontend driver (NEW)
<*> Keyboard-device frontend driver (NEW)
[*] Disable serial port drivers (NEW)
<*> Export Xen attributes in sysfs (NEW)
(256) Number of guest devices (NEW)
Xen version compatibility (3.0.4
and later) --->

After xen confiuration, please make sure that .config has the
following parameter configuration:

* CONFIG_XEN=y
* CONFIG_XEN_MAX_DOMAIN_MEMORY=32
* CONFIG_XEN_SAVE_RESTORE=y
* CONFIG_XEN_DOM0=y
* CONFIG_XEN_PRIVILEGED_GUEST=y
* CONFIG_XEN_PCI=y
* CONFIG_PCI_XEN=y
* CONFIG_XEN_BLKDEV_FRONTEND=m
* CONFIG_NETXEN_NIC=m
* CONFIG_XEN_NETDEV_FRONTEND=m
* CONFIG_XEN_KBDDEV_FRONTEND=m
* CONFIG_HVC_XEN=y
* CONFIG_XEN_FBDEV_FRONTEND=m
* CONFIG_XEN_BALLOON=y
* CONFIG_XEN_SCRUB_PAGES=y
* CONFIG_XEN_DEV_EVTCHN=y
* CONFIG_XEN_BACKEND=y
* CONFIG_XEN_BLKDEV_BACKEND=y
* CONFIG_XEN_NETDEV_BACKEND=y
* CONFIG_XENFS=y

* CONFIG_XEN_NETDEV_BACKEND=y
* CONFIG_XENFS=y
* CONFIG_XEN_COMPAT_XENFS=y
* CONFIG_XEN_XENBUS_FRONTEND=m

Install these debian packages using
sudo dpkg -i <name>
Add the following line to /etc/fstab

none /proc/xen xenfs defaults 0 0

and reboot the machine.

After installing the debian packages, the Grub Entry will look like
the following:
title Xen 3.4.1 / Debian GNU/Linux, kernel 2.6.31.4-tapas-xen-4
root (hd0,0)
kernel /boot/xen-3.4.1.gz
module /boot/vmlinuz-2.6.31.4-tapas-xen-4 root=/dev/sda1 ro
console=tty0
module /boot/initrd.img-2.6.31.4-tapas-xen-4

Hope that will help.

On Sat, Dec 5, 2009 at 2:49 AM, secdev geek <secdevgeek@...> wrote:

> Hi list,
>
> I am starting a academic security related project and I was wondering if
> there is any documentation on compiling xen/dom0 with a recent kernel?
>
> I've seen a few good intentioned threads, but no real documentation so far.
> Any helpful pointers will be greatly appreciated!
>
> Thanks in advance,
> - SDG
>
> P.S: First mail, not sure if I should post it here...let me know if I am on
> the wrong list. :-)
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@...
> http://lists.xensource.com/xen-users
>

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Re: how to get xen with a kernel 2.6.27 or above?

2009-12-04T13:26:52Z

secdev geek schrieb:
>
> I am starting a academic security related project and I was wondering if
> there is any documentation on compiling xen/dom0 with a recent kernel?
>
> I've seen a few good intentioned threads, but no real documentation so
> far. Any helpful pointers will be greatly appreciated!
>
The best Manual ist here:
http://wiki.xensource.com/xenwiki/XenDom0Kernels

Stefan Kuhne

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signature.asc (564 bytes) Download Attachment

how to get xen with a kernel 2.6.27 or above?

2009-12-04T13:19:54Z

Hi list,

I am starting a academic security related project and I was wondering if there is any documentation on compiling xen/dom0 with a recent kernel?

I've seen a few good intentioned threads, but no real documentation so far. Any helpful pointers will be greatly appreciated!

Thanks in advance,
- SDG

P.S: First mail, not sure if I should post it here...let me know if I am on the wrong list. :-)

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Re: No vmx flag, and no vnc

2009-12-04T13:19:46Z

On Fri, Dec 4, 2009 at 9:01 PM, David Henningsson
<launchpad.web@...> wrote:
> Also, I doubt 2.6.18 is an option for this hardware.

The original 2.6.18, perhaps.
But Redhat and xen.org both have backported lost of drivers.

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Re: Can't boot into xen

2009-12-04T13:14:16Z

On Sat, Dec 5, 2009 at 12:56 AM, Robert Miesen <robert.miesen@...> wrote:
> The same problem happens both when trying a native installation of
> xen and when trying to boot from the xen live CD.

Did you try installing RHEL/Centos 5.4? It should work for most
hardware, and has Xen built in.

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Re: loop-module will not load

2009-12-04T13:11:44Z

On Fri, Dec 4, 2009 at 2:17 AM, Christian Kniep <ChristianKniep@...> wrote:
> cd /usr/src/
> hg clone http://xenbits.xensource.com/ext/linux-2.6.27-xen.hg

where did you get instructions to do this?
You shouldn't use that kernel. See
http://wiki.xensource.com/xenwiki/XenDom0Kernels

> chieftec:~# modprobe loop
> FATAL: Error inserting loop
> (/lib/modules/2.6.27.5/kernel/drivers/block/loop.ko): Unknown symbol in
> module, or unknown parameter (see dmesg)

First step is to actually look at the output of "dmesg" :) However I
suggest you stick with known-working kernel.

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Re: (re)load new kernel with rebooting host node?

2009-12-04T13:04:46Z

On Thu, Dec 3, 2009 at 2:02 AM, Rudi Ahlers <Rudi@...> wrote:
> Hi all,
>
> Is it possible to reload the dom0 / host node's kernel with a newer
> one, without rebooting the server?

Not that I know of

> I know kexec can do something like
> this for security patches, but I don't know much about kexec, and I
> don't want to mess up a production server either.

AFAIK current implementation of kexec works like a reboot, only
without going through BIOS and bootloader. At least that's how it was
implemented in Ubuntu

> So, has anyone done
> something like this before? I need to load a new kernel for one of the
> domU's iptables to work, but don't want to reboot the whole server and
> cause downtime for the other domU's.

You shouldn't need to that. What changes did you made on dom0? My
setup works fine with iptables on domU in a mostly-default setup.

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Xen and EC2 power DARPA Network Challenge Team DeciNena

2009-12-04T12:03:55Z

I just wanted to drop a note to this list and mention how awesome Xen (and Drupal, if
folk are into that) has been in helping me field my team website for the DARPA Network
Challenge (tomorrow) https://networkchallenge.darpa.mil/default.aspx

My site, Team DeciNena:
http://decinena.com/

is currently run on a 32-bit Ubuntu PV DomU (LAMP+Drupal) on a Debian 5 (Lenny) 64-bit Dom0.

Here's a writeup about our Drupal side of things:
http://drupal.org/node/649860

We are anticipating high traffic during the event tomorrow, so we have replicated the
site over to Amazon EC2/S3/RDS. We have one central RDS (EC2/Xen cloud system running
MySQL) that runs the database, and we can dynamically add/remove nodes from teh RDS
cluster via Amazon's AWS control panel.

We also have one EC2 machine running and NFS server that stores and shares the common
dynamic site content (static site content like the Drupal installation lives on the actual
EC2 node to reduce NFS traffic).

We also have any number of identical EC2 Ubuntu nodes installed with Apache and the
Drupal site. These actually process the HTTP requests from the client users, and talk to
the NFS and RDS servers.

The original Xen machine switches to being a load-balancing redirector when the site
makes the cutover to the cloud-based implementation, so I don't have to wait for DNS
changes to propagate.

Xen and Xen-based-EC2 have been instrumental in making this happen. Virtualization is
awesome.

Yes, I'm also blatantly self-promoting my team. Come join me and maybe share in part of
the $40,000 prize, even if you aren't the one who spots a balloon. Even if you can't join,
I request you send a note to your friends/twitter/facebook about it. That's the actual
goal of DARPA's game -- social network exploration.

--
Chris 'Xenon' Hanson, omo sanza lettere Xenon AlphaPixel.com
PixelSense Landsat processing now available! http://www.alphapixel.com/demos/
"There is no Truth. There is only Perception. To Perceive is to Exist." - Xen

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Re: Announcing the Release of the World's First 64-bit Build of Google's Chromium OS with Xen Virtualization Support

2009-12-04T11:50:04Z

Detailed Instructions for Installing and Running Windows XP HVM Virtual Machine on the Bundled Xen 3.4.3-RC1-pre + 64-bit Google Chrome OS Live USB Image

After verifying that the installation and execution of Fedora 11 Linux PV virtual machine works with the bundled Xen 3.4.3-rc1-pre + 64-bit Google Chrome OS, I proceeded to installing and running Windows XP as a HVM virtual machine.

Here are the exact steps:

Remount the root filesystem (/) in read-write mode.

$ sudo mount -o remount,rw /

Start the xend daemon.

$ sudo service xend start

Configure Xen networking.

$ sudo ifconfig eth0 up

$ sudo dhclient eth0

Check that the dynamic configuration of network interface eth0 works.

$ sudo ifconfig eth0

Check that the entries in the kernel routing table are correct.

$ route

Check that the domain name servers have been configured correctly by the DHCP protocol.

$ cat /etc/resolv.conf

Mount the disk partition containing disk images of all the virtual machines.

$ sudo mount /dev/sdc4 /virtualmachines

$ cd /virtualmachines

Create a 5 GB virtual harddisk for installing Windows XP as a virtual machine.

$ sudo dd if=/dev/zero of=windows-xp.img bs=1 count=1 seek=5G

$ cd /etc/xen

Configure firewalling rules.

Allow incoming VNC connections.

$ sudo iptables -I INPUT 4 -p tcp --dport 5900 -j ACCEPT

Set the default firewall policies to ACCEPT for the FORWARD and OUTPUT chains.

$ sudo iptables -P FORWARD ACCEPT

$ sudo iptables -P OUTPUT ACCEPT

Create Windows XP HVM virtual machine configuration file.

$ sudo vi windows

import os, re
arch = os.uname()[4]
if re.search('64', arch):
arch_libdir = 'lib64'
else:
arch_libdir = 'lib'

kernel = "/usr/lib/xen/boot/hvmloader"
builder='hvm'
memory = 3072

# Should be at least 2KB per MB of domain memory, plus a few MB per vcpu.
shadow_memory = 8
name = "winxphome32"
vif = [ 'bridge=eth0' ]
acpi = 1
apic = 1
disk = [ 'file:/virtualmachines/windows-xp.img,hda,w', 'phy:/dev/sr0,hdc:cdrom,r' ]

device_model = '/usr/lib/xen/bin/qemu-dm'

#-----------------------------------------------------------------------------
# boot on floppy (a), hard disk (c) or CD-ROM (d)
# default: hard disk, cd-rom, floppy
boot="cd"
sdl=0
vnc=1
vnclisten="<IP address of domain 0>"
vncdisplay=0
vncconsole=0
vncpasswd=''

serial='pty'
usbdevice='tablet'

Start the Windows XP HVM virtual machine.

$ sudo xm create windows

You will need to use a VNC viewer on another computer or laptop to remote in on the Windows XP virtual machine installation.

For example,

$ vncviewer <IP address of domain 0>

or

$ xtightvncviewer <IP address of domain 0>

Follow through the Windows XP virtual machine installation and you are done. Using the same concept outlined above, you can also create Windows Vista, Windows 7, Windows Server 2003, and/or Windows Server 2008 virtual machines with the bundled Xen 3.4.3-rc1-pre + 64-bit Google Chrome OS Live USB image.

--
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Alma Maters:
(1) Singapore Polytechnic
(2) National University of Singapore
My Primary Blog: http://teo-en-ming-aka-zhang-enming.blogspot.com
My Secondary Blog: http://enmingteo.wordpress.com
My Youtube videos: http://www.youtube.com/user/enmingteo
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Street: Bedok Reservoir Road
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Re: No vmx flag, and no vnc

2009-12-04T10:38:53Z

On Fri, Dec 04, 2009 at 03:01:49PM +0100, David Henningsson wrote:

> > On Fri, Dec 04, 2009 at 11:18:36AM +0100, David Henningsson wrote:
> >> > On Thu, Dec 03, 2009 at 10:25:38AM +0100, David Henningsson wrote:
> >> >> Hi,
> >> >>
> >> >> I'm stuck in my attempts to get xen up and running.
> >> >>
> >> >> I selected Debian Lenny as base as I'm a bit more familiar with
> >> >> Debian/Ubuntu than with the other Linux distros. Uname -r =
> >> >> 2.6.26-2-xen-amd64. Xen version should be 3.2-1. Guest is Windows
> >> Server
> >> >> 2008 R2.
> >> >
> >> > First of all you might have hard time getting 2008R2 working on Xen
> >> 3.2.
> >> > 2008R2 didn't exist when 3.2 was released.
> >> >
> >> > Xen has has a lot of fixes and improvements after version 3.2.
> >
> > Also what does "xm info" say about the capabilities/caps?
>
> Hi Pasi and Fajar, and thanks for trying to help out :-)
>
> Here is the requested information:
>
> # xm info | grep caps
> hw_caps :
> bfebfbff:28100800:00000000:00000140:009ce3bd:00000000:00000001
> xen_caps : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32
> hvm-3.0-x86_32p hvm-3.0-x86_64
>

so the caps says you _do_ have hvm (vmx) support.

> There is no qemu-dm process after having run "xm create" (which completes
> successfully):
>

Do you even have qemu-dm binary?

> # ps -ef | grep qemu
> root 3447 2804 0 14:52 pts/0 00:00:00 grep qemu
>
> The last thing in "xend.log" is my domU being "unpaused". And xm list
> shows it:
>

So no errors in the log?

-- Pasi

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Re: how to create XEN config file of running domU?

2009-12-04T10:08:50Z

You can use "xm list -l" to dump the configuration in SXP format; then you should be able to use "xm new" or "xm create" with the "-F" option to load an SXP-based config file. See the "xm" man page for more info - that's where I dug up this.

-Nick

>>> On 2009/12/03 at 15:04, Rudi Ahlers <Rudi@...> wrote:
> Hi all,
>
> I use FluidVM on some of our VPS host nodes, and the management server
> has crashed, so now I need to recover the running VM's, somehow.
> FluidVM deploys the domU's on the hostnode dynamically from a
> database, i.e. there's no /etc/xen/vps1 (for example) config files.
> The domU's are still running on the servers, and I now want to create
> config files for them, while they're running.
>
> How would I be able todo this?
>
> For example, here's a list of running VM's from one of the servers:
>
> root@usaxen02:[~]$ xm list
> Name ID Mem(MiB) VCPUs State Time(s)
> AndriesBurger_39_cronos 90 255 1 -b---- 42.4
> Bruce_18_carmen 60 255 1 r----- 3528327.5
> Domain-0 0 3433 4 r----- 1116681.7
> Rudi_14_mars 40 3007 2 -b---- 953036.3
> Rudi_44_vps2 93 255 1 -b---- 22.9
>
>
> Is there any way to create a config file,
> /etc/xen/AndriesBurger_39_cronos, from the running domU
> AndriesBurger_39_cronos ?

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