[Xen-users] Basic Xen Questions

["Michael J. Baysek" <mjbaysek@xxxxxxxxxx>]

I did the favor of making a new thread for this...

Firstly.  If you have not yet, http://www.fedoraproject.org/wiki/FedoraXenQuickstart

I can tell you that even since FC4 was released, Xen has changed a lot.  Since the FC4 packages are reflecting the 3.0 development, using the Xen 2.0 user guide is not 100% accurate, I have tried.  Also, it seems that the latest FC release 1447 of Xen is noticably different than the 1398 release, as some of the xm commands are different.  Personally I would expect future releases to do the same so I suggest test any upgrades on a staging server.

About Network:  As long as you have nics=1 in your conf file for your domU, the network device should be available in your guest OS as eth0.  In Redhat-esque style, you would edit your network config in /etc/sysconfig/.  I just copied /etc/sysconfig/network* from another machine, and did a

grep -rin "192.168.0.3" /etc/sysconfig/*  

for the IP of the machine I took the config from, and updated to the new IP for my domU.

As far as installing OS other than FC4 inside of domU, I have installed CentOS.  Here are the steps I have used.  I imagine you can use this for any distro that uses Yum. 

1. Create my image (I use LVM, but you can use loopback), mke2fs -j to that image
2. Temporarily move  /etc/yum.repos.d/* files out of that directory
3. Copy Centos-Base.repo into /etc/yum.repos.d/
4. Edit Centos-Base.repo to replace all the of variables with the values you want.  Yum can't install for a different releasever and basearch, so you set these by hand in the repo file.  You could also install from local filesystem like DVD by using file:// instead of http in the repo file.
   
5. Mount the image to /mnt/tmpdir
6. yum --installroot=/mnt/tmpdir -y groupinstall Base
7. Follow the rest of the steps in the Fedora Xen Howto for the rest.

I also have been running Gentoo 2005.0 which I moved over from User-Mode-Linux.

Hope this helps.



Johnson, Michael wrote:

Hi,
Could you help me with a few Xen questions?  It's basic stuff.  I'm
looking at Xen for the first time.  We have VMWare already up and
running and are happy with it but I was asked to look at Xen.  

I installed FC4 from cd and chose to install everything, including Xen.
Following the Xen User's manual Xen v2.0 for x86 I have a dom0 setup and
created a second domain and called it rawhide.

Question,
How do I configure rawhide with an IP so I can either ssh or telnet to
it?

Have you installed other operating systems, i.e. RedHat EL3.0 to run in
a domain? 

Thanks,
Mike

-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Michael J.
Baysek
Sent: Wednesday, September 14, 2005 2:21 PM
To: Eric Brown
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] xm shutdown & xm destroy won't get rid of VM

I too have this problem:

    # xm list

    Name              Id  Mem(MB)  CPU VCPU(s)  State  Time(s)
    Domain-0           0       91    0      1   r----   6753.9
    lick              11        0    0      1   ----c      0.3
    lick              11        0    0      1   ----c      0.3
    lmon               4      255    0      1   -b---  34997.5
    lots               5      191    0      1   -b---   5210.1
    loud               6      511    0      1   -----   6138.4

      

In my case this happened after I ran out of memory in the lick domU (no
swap was setup yet). The oom-killer hosed the domU. Even the console. So
I tried to destroy and start another. It was then that I did an xm list,
to my horror.



Eric Brown wrote:
  

I tried "xm shutdown" and then "xm destroy", my listing still shows:

$ xm list
Name Id Mem(MB) CPU State Time(s) Console Domain-0 0 156 0 r---- 766.2
    

asgtest0 9 0 3 -b--- 1.2 9609 debianarchive 15 255 1 -b--- 6.4 9615

What should i do to get rid of asgtest0?

Thanks!


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-- 

Michael J. Baysek 
Systems Analyst
Carnegie Mellon University, Auton Lab
http://www.autonlab.org
mjbaysek@xxxxxxxxxx

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