RE: [Xen-users] More CentOS 5.2 & Xen 3.2.1 Compiling Questions!

Hello Daniel,

Do virt-manager and virt-install still work on your system with CentOS 5.2 & Xen 3.2.1 together?

Installing CentOS 5.2 without the Xen packages leaves those off the system, but when I upgrading to Xen 3.2.1 (or later) on a Centos 5.2 installed with the Xen packages seems to put the ‘xm’ commands in a broken state (“Permission denied” errors start to show up).

Do you install them separately after upgrading?

Thanks in advance,

From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Daniel Kao
Sent: Monday, July 21, 2008 3:58 PM
To: Xen-user List
Subject: Re: [Xen-users] More CentOS 5.2 & Xen 3.2.1 Compiling Questions!

Hi Ross,

Bingo. I skipped one of the most important parts! ;) I keep forgetting that grub.conf isn't automagically updated (which is a GOOD thing). Changed over to the proper one and Xen 3.2.1 is running beautifully in CentOS 5.2 x86_64.

I enabled vtd=1 and have successfully done a PCI passthrough (pciback) to a HVM domU (Windows XP) for a video capture card device which is on the PCI Express bus.

Thank you VERY much, Ross!

Cheers,
Daniel

P.S. So the full instructions are for getting Xen 3.2.1 installed onto a fresh copy of CentOS 5.2 (without existing Xen packages):

1. rpm -i http://bits.xensource.com/oss-xen/release/3.2.0/centos-5.1/xen-3.2.0-0xs.centos5.src.rpm 2> /dev/null
2. cd /usr/src/redhat/SOURCES ; wget http://bits.xensource.com/oss-xen/release/3.2.1/xen-3.2.1.tar.gz
3. vi ../SPECS/xen.spec
i. Change "Version: 3.2.0" to "Version 3.2.1"
ii. Change "Source0: xen-3.2.0.tar.gz" to "Source0: xen-3.2.1.tar.gz"
iii. Uncomment "# /usr/lib/xen/boot/hvmloader" to "/usr/lib/xen/boot/hvmloader". (noted from previous threads to avoid rpmbuild error of unpackaged file)
4. yum -y install transfig texi2html tetex-latex gtk2-devel libaio-devel gnutls-devel (dependencies needed for rpmbuild of xen.spec in CentOS)
5. cd /usr/src/redhat/SPECS ; rpmbuild -ba ./xen.spec
6. Grab some coffee...

... and come back to this:

Wrote: /usr/src/redhat/SRPMS/xen-3.2.1-0xs.src.rpm
Wrote: /usr/src/redhat/RPMS/x86_64/xen-3.2.1-0xs.x86_64.rpm
Wrote: /usr/src/redhat/RPMS/x86_64/xen-libs-3.2.1-0xs.x86_64.rpm
Wrote: /usr/src/redhat/RPMS/x86_64/xen-devel-3.2.1-0xs.x86_64.rpm
Wrote: /usr/src/redhat/RPMS/x86_64/xen-debuginfo-3.2.1-0xs.x86_64.rpm
Executing(%clean): /bin/sh -e /var/tmp/rpm-tmp.xxxxxx
+ umask 022
+ cd /usr/src/redhat/BUILD
+ cd xen-3.2.1
+ rm -rf /var/tmp/xen-3.2.1-0xs-root
+ exit 0

7. vi /etc/yum.confand temporarily set "gpgcheck=0" to "gpgcheck=1" since RPMs aren't signed.
8. cd /usr/src/redhat/RPMS/x86_64 ; yum -y install xen-3.2.1-0xs.x86_64.rpm xen-libs-3.2.1-0xs.x86_64.rpm xen-devel-3.2.1-0xs.x86_64.rpm
9. vi /etc/yum.conf and set gpgcheck back to "gpgcheck=1".
10. vi /etc/grub.conf and change the "kernel" line to "kernel /xen.gz-3.2" or "kernel /xen.gz-3.2 vtd=1" or "kernel /xen.gz-3.2 vtd=1 msi_irq_enable=1" (one of the three depending if you want Intel VT-d and/or MSI/MSI-X enabled for capable systems) and make sure "default=" is pointed to the correct title. **Note: Double-check /boot/xen.gz-3.2 exists on your system!
11. Reboot.

Check Xen (xm dmesg) and see if you're golden.

12. Using yum, install virt-manager and/or virt-viewer to get all the CLI/GUI utilities!

Cheers,
Daniel

Ross S. W. Walker wrote:

Daniel Kao wrote:

Hi Ross,

Thank you very much for the reply.  It makes sense!  So let

me break down the instructions:

1. rpm -i

http://bits.xensource.com/oss-xen/release/3.2.0/centos-5.1/xen

-3.2.0-0xs.centos5.src.rpm 2> /dev/null

2. cd /usr/src/redhat/SOURCES ; wget

http://bits.xensource.com/oss-xen/release/3.2.1/xen-3.2.1.tar.gz

3. vi ../SPECS/xen.spec

 i. Change "Version: 3.2.0" to "Version 3.2.1"

 ii. Change "Source0: xen-3.2.0.tar.gz" to "Source0: xen-3.2.1.tar.gz"

 iii. Uncomment "# /usr/lib/xen/boot/hvmloader" to

"/usr/lib/xen/boot/hvmloader". (noted from previous threads

to avoid rpmbuild error of unpackaged file)

4. yum -y install transfig texi2html tetex-latex gtk2-devel

libaio-devel gnutls-devel (dependencies needed for rpmbuild

of xen.spec in CentOS)

5. cd /usr/src/redhat/SPECS ; rpmbuild -ba ./xen.spec

6. Grab some coffee...

... and come back to this:

Wrote: /usr/src/redhat/SRPMS/xen-3.2.1-0xs.src.rpm

Wrote: /usr/src/redhat/RPMS/x86_64/xen-3.2.1-0xs.x86_64.rpm

Wrote: /usr/src/redhat/RPMS/x86_64/xen-libs-3.2.1-0xs.x86_64.rpm

Wrote: /usr/src/redhat/RPMS/x86_64/xen-devel-3.2.1-0xs.x86_64.rpm

Wrote: /usr/src/redhat/RPMS/x86_64/xen-debuginfo-3.2.1-0xs.x86_64.rpm

Executing(%clean): /bin/sh -e /var/tmp/rpm-tmp.xxxxxx

+ umask 022

+ cd /usr/src/redhat/BUILD

+ cd xen-3.2.1

+ rm -rf /var/tmp/xen-3.2.1-0xs-root

+ exit 0

7. vi /etc/yum.conf and temporarily set "gpgcheck=0" to

"gpgcheck=1" since RPMs aren't signed.

8. cd /usr/src/redhat/RPMS/x86_64 ; yum -y install

xen-3.2.1-0xs.x86_64.rpm xen-libs-3.2.1-0xs.x86_64.rpm

xen-devel-3.2.1-0xs.x86_64.rpm

9. vi /etc/yum.conf and set gpgcheck back to "gpgcheck=1".

Reboot.

xend won't start now with the following in /var/log/xen/xend.log

[2008-07-17 16:30:23 7029] INFO (SrvDaemon:226) Xend stopped

due to signal 15.

[2008-07-17 16:30:23 7870] INFO (SrvDaemon:331) Xend Daemon started

[2008-07-17 16:30:23 7870] INFO (SrvDaemon:335) Xend

changeset: unavailable.

[2008-07-17 16:30:23 7870] INFO (SrvDaemon:342) Xend version: Unknown.

[2008-07-17 16:30:23 7870] ERROR (SrvDaemon:353) Exception

starting xend ((13, 'Permission denied'))

Traceback (most recent call last):

  File

"/usr/lib64/python2.4/site-packages/xen/xend/server/SrvDaemon.

py", line 345, in run

    servers = SrvServer.create()

  File

"/usr/lib64/python2.4/site-packages/xen/xend/server/SrvServer.

py", line 251, in create

    root.putChild('xend', SrvRoot())

  File

"/usr/lib64/python2.4/site-packages/xen/xend/server/SrvRoot.py

", line 40, in __init__

    self.get(name)

  File

"/usr/lib64/python2.4/site-packages/xen/web/SrvDir.py", line

82, in get

    val = val.getobj()

  File

"/usr/lib64/python2.4/site-packages/xen/web/SrvDir.py", line

52, in getobj

    self.obj = klassobj()

  File

"/usr/lib64/python2.4/site-packages/xen/xend/server/SrvNode.py

", line 30, in __init__

    self.xn = XendNode.instance()

  File

"/usr/lib64/python2.4/site-packages/xen/xend/XendNode.py",

line 709, in instance

    inst = XendNode()

  File

"/usr/lib64/python2.4/site-packages/xen/xend/XendNode.py",

line 83, in __init__

    self.other_config["xen_pagesize"] =

self.xeninfo_dict()["xen_pagesize"]

  File

"/usr/lib64/python2.4/site-packages/xen/xend/XendNode.py",

line 673, in xeninfo_dict

    return dict(self.xeninfo())

  File

"/usr/lib64/python2.4/site-packages/xen/xend/XendNode.py",

line 617, in xeninfo

    info['xen_scheduler'] = self.xenschedinfo()

  File

"/usr/lib64/python2.4/site-packages/xen/xend/XendNode.py",

line 607, in xenschedinfo

    sched_id = self.xc.sched_id_get()

Error: (13, 'Permission denied')

I did a quick peek in /usr/lib64/python2.4/site-packages/xen

and all the Python tools looks to be correct with 3.2.1.

Any ideas?

Yes, almost perfect setup, except, need to edit /boot/grub/grub.conf

and switch all /boot/xen-3.1... references to /boot/xen-3.2...

the errors you saw are what happens when the newer libraries try

to access the older hypervisor.

-Ross

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Daniel Kao

Übermind, Inc.

Seattle, WA, U.S.A.

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RE: [Xen-users] More CentOS 5.2 & Xen 3.2.1 Compiling Questions!