Xen install

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Xen install

Ramarathnam Sriram
Hi,
  When i boot into my xen-linux2.6.11.10 kernel and give the command
  xend start i get the following message

>
> [root@tfrc1 ~]# xend start
> Traceback (most recent call last):
>   File "/usr/sbin/xend", line 27, in ?
>     from xen.xend.server import SrvDaemon
>   File "/auto/groups/xeno-xenod/users/xenod/cron-build/R24768.dir/xen-
> 2.0.bk/dist/install/usr/lib/python/xen/xend/server/SrvDaemon.py", line 20,
> in ?
> ImportError: No module named twisted.internet
> [root@tfrc1 ~]#
>
> Please suggest what to do.
>
> Thanks
> Sriram


On Tue, 21 Jun 2005 06:48:20 -0400 (EDT), xen-users-request wrote

> Send Xen-users mailing list submissions to
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> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Xen-users digest..."
>
> Today's Topics:
>
>    1. Re: Stable VBD Types (Nils Toedtmann)
>    2. Kernel panic, unable to mount rootfs (Matthew J. Harmon)
>    3. Re: Kernel panic, unable to mount rootfs (Matthew J. Harmon)
>    4. Re: Re: Kernel panic, unable to mount rootfs (Yvette Chanco)
>    5. big sized applications in XEN virtual machine (Andre Kuester)
>    6. Re: big sized applications in XEN virtual machine
>       (Fajar A. Nugraha)
>
>    7. Re: big sized applications in XEN virtual machine (Wim
> Coekaerts)
>    8. Re: big sized applications in XEN virtual machine
>       (Fajar A. Nugraha)
>    9. Re: Xen Install (James Bulpin)
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 21 Jun 2005 00:10:33 +0200
> From: Nils Toedtmann <[hidden email]>
> Subject: Re: [Xen-users] Stable VBD Types
> To: [hidden email]
> Cc: [hidden email]
> Message-ID: <[hidden email]>
> Content-Type: text/plain
>
> Am Montag, den 20.06.2005, 18:11 +0100 schrieb Alex Adranghi:
> [...]
> > Thanks. Although this is relevent to what I'm wanting to do, what I
> > meant to say was using lvm snapshots as a way to reduce common files
> > from repeating on disk. I quote the LVM-HowTo as it explains it a little
> > better.
> >
> > "It is also useful for creating volumes for use with Xen. You can create
> > a disk image, then snapshot it and modify the snapshot for a particular
> > domU instance. You can then create another snapshot of the original
> > volume, and modify that one for a different domU instance. Since the
> > only storage used by a snapshot is blocks that were changed on the
> > origin or the snapshot, the majority of the volume is shared by the
> > domU's."
> [...]
>
> We use the device-mapper for this. Works for us [tm]:
>
>   dd if=/dev/zero of=/tmp/CoW1 bs=1M count=$CoW_SIZE
>   dd if=/dev/zero of=/tmp/CoW2 bs=1M count=$CoW_SIZE
>
>   losetup /dev/loop0 root_fs
>   losetup /dev/loop1 /tmp/CoW1
>   losetup /dev/loop2 /tmp/CoW2
>
>   BLOCKSIZE=`blockdev --getsize /dev/loop0`
>
>   echo "0 $BLOCKSIZE linear                           /dev/loop0  
> 0" \    | dmsetup create rootfs_base
>
>   echo "0 $BLOCKSIZE snapshot /dev/mapper/rootfs_base /dev/loop1 p
> 8" \    | dmsetup create rootfs1
>
>   echo "0 $BLOCKSIZE snapshot /dev/mapper/rootfs_base /dev/loop2 p
> 8" \    | dmsetup create rootfs2
>
> You should now be able to use /dev/mapper/rootfs{1|2} read/write.
> Only diff blocks to "root_fs" get written to "/tmp/CoW{1|2}".
>
> This way we boot >20 domUs off one root_fs (after shutdown we delete
> the CoW files). I have now clue how to do that with LVM[2].
>
> /nils.
>
> --
> there is no sig
>
> ------------------------------
>
> Message: 2
> Date: Mon, 20 Jun 2005 17:56:17 -0500 (CDT)
> From: "Matthew J. Harmon" <[hidden email]>
> Subject: [Xen-users] Kernel panic, unable to mount rootfs
> To: [hidden email]
> Message-ID: <[hidden email]>
> Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
>
> Alright, thank you for the "noreboot" kernel option!
>
> Here is the full err:
>
> Root-NFS: No NFS server available, giving up.
> VFS: Unable to mount root fs via NFS, trying floppy.
> VFS: Cannot open root device "sda2" or unknown-block(2,0)
> Please append a correct "root=" boot option
> Kernel panic - not syncing: VFS: Unable to mount root fs on
> unknown-block(2,0)
>
> Doing a bit of research on the error message, found the following
> threads on xen-devel: http://lists.xensource.com/archives/html/xen-
> devel/2004-10/msg00382.html
> http://lists.xensource.com/archives/html/xen-devel/2004-12/msg00470.html
>
> I'm thinking this might not be a xen problem, but a grub problem?
>
> Still working on the issue, any tips would be appreciated.
>
> Thanks.
>
> -Matthew
>
> ------------------------------
>
> Message: 3
> Date: Mon, 20 Jun 2005 18:13:22 -0500 (CDT)
> From: "Matthew J. Harmon" <[hidden email]>
> Subject: [Xen-users] Re: Kernel panic, unable to mount rootfs
> To: [hidden email]
> Message-ID: <[hidden email]>
> Content-Type: TEXT/PLAIN; charset=US-ASCII
>
> Additionally, the menu.lst for grub is as follows:
>
> title Debian GNU/Linux, Xen 2.6.11xen0, testing 2005.06.18
> kernel=/xen.gz dom0_mem=32768 noreboot
> root (hd0,0)
> module=(hd0,0)/xen-linux-2.6.11charliexen0 root=/dev/sda2 ro
> console=tty0 console=ttyS0 showopts selinux=0
> ### BEGIN AUTOMAGIC KERNELS LIST
> ###[snip - all default]
>
> -M
>
> On Mon, 20 Jun 2005, Matthew J. Harmon wrote:
>
> Alright, thank you for the "noreboot" kernel option!
>
> Here is the full err:
>
> Root-NFS: No NFS server available, giving up.
> VFS: Unable to mount root fs via NFS, trying floppy.
> VFS: Cannot open root device "sda2" or unknown-block(2,0)
> Please append a correct "root=" boot option
> Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-
> block(2,0)
>
> Doing a bit of research on the error message, found the following
> threads on xen-devel: http://lists.xensource.com/archives/html/xen-
> devel/2004-10/msg00382.html
> http://lists.xensource.com/archives/html/xen-devel/2004-12/msg00470.html
>
> I'm thinking this might not be a xen problem, but a grub problem?
>
> Still working on the issue, any tips would be appreciated.
>
> Thanks.
>
> -Matthew
>
> ------------------------------
>
> Message: 4
> Date: Mon, 20 Jun 2005 19:28:02 -0500
> From: Yvette Chanco <[hidden email]>
> Subject: Re: [Xen-users] Re: Kernel panic, unable to mount rootfs
> To: "Matthew J. Harmon" <[hidden email]>, [hidden email]
> Message-ID: <[hidden email]>
> Content-Type: text/plain; charset=ISO-8859-1
>
> If you're getting that far (to starting the dom0) then grub might not
> directly be the issue. I got that error message when I was using a
> kernel (for dom0) that hadn't been compiled with support for my scsi
> adapter. From the looks of your menu.lst, though, it seems you
> probably did a custom build, so you would know what you included. My
> only other guess is if there is an initrd image you haven't put in
> the grub configuration?
>
> On 6/20/05, Matthew J. Harmon <[hidden email]> wrote:
> > Additionally, the menu.lst for grub is as follows:
> >
> > title Debian GNU/Linux, Xen 2.6.11xen0, testing 2005.06.18
> > kernel=/xen.gz dom0_mem=32768 noreboot
> > root (hd0,0)
> > module=(hd0,0)/xen-linux-2.6.11charliexen0 root=/dev/sda2 ro console=tty0
> > console=ttyS0 showopts selinux=0
> > ### BEGIN AUTOMAGIC KERNELS LIST
> > ###[snip - all default]
> >
> > -M
> >
> > On Mon, 20 Jun 2005, Matthew J. Harmon wrote:
> >
> > Alright, thank you for the "noreboot" kernel option!
> >
> > Here is the full err:
> >
> > Root-NFS: No NFS server available, giving up.
> > VFS: Unable to mount root fs via NFS, trying floppy.
> > VFS: Cannot open root device "sda2" or unknown-block(2,0)
> > Please append a correct "root=" boot option
> > Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block
(2,0)
> >
> > Doing a bit of research on the error message, found the following threads
on

> > xen-devel:
> > http://lists.xensource.com/archives/html/xen-devel/2004-10/msg00382.html
> > http://lists.xensource.com/archives/html/xen-devel/2004-12/msg00470.html
> >
> > I'm thinking this might not be a xen problem, but a grub problem?
> >
> > Still working on the issue, any tips would be appreciated.
> >
> > Thanks.
> >
> > -Matthew
> >
> > _______________________________________________
> > Xen-users mailing list
> > [hidden email]
> > http://lists.xensource.com/xen-users
> >
>
> --
> -Yvette Chanco
> www.option-c.com
>
> ------------------------------
>
> Message: 5
> Date: Tue, 21 Jun 2005 04:04:45 +0200
> From: Andre Kuester <[hidden email]>
> Subject: [Xen-users] big sized applications in XEN virtual machine
> To: [hidden email]
> Message-ID: <[hidden email]>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Hi,
>
> recently I discovered the exsistance of Xen. I looked a bit around
> and feel quite impressed by this solution. Then an idea came to my
> mind, having a partition for a more or less stable server and one
> for my bleeding edge desktop playground. I think I am not the only
> one with that ;) But I dont want to use the typical lamp server
> config, I thought more about a massive database server, such as DB2
> together with a recent version of SAP Netweaver. Both of them are
> quite memory and of course IO-hungry. I have decent hardware to run
> that, but I couldnt found any experience report about such a xen-DB2-
> SAP combination. So I ask you, if there are any experiences with
> that. In special I ask myself, how the removal of the TLS libraries might
> affect performance and stability of those applications.
> (Preferred OS is RHEL4)
>
> I would be glad to hear some hints or experiences.
>
> Thanks & Regards,
> Andre.
>
> ------------------------------
>
> Message: 6
> Date: Tue, 21 Jun 2005 10:19:28 +0700
> From: "Fajar A. Nugraha" <[hidden email]>
> Subject: Re: [Xen-users] big sized applications in XEN virtual
> machine To: [hidden email] Message-ID:
<[hidden email]>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Andre Kuester wrote:
>
> >So I ask you, if there are any experiences
> >with that. In special I ask myself, how the removal of the TLS libraries
might

> >affect performance and stability of those applications.
> >(Preferred OS is RHEL4)
> >
> >  
> >
> I tried using Oracle 10g on a rather old version of Xen from bk (it
> still uses kernel 2.6.9) with Lineox 4.
> TLS libs (/lib/tls, /usr/lib/tls, /usr/X11r6/lib/tls) moved out of
> the way. This configuration works great running MTA (mail filtering
> purposes) and web server (LAMP). However it didn't work quite as
> expected running Oracle. Oracle runs, but often I would get entries
> like these on alert log :
>
> ORA-07445: exception encountered: core dump [kkogbro()+2832]
> [SIGSEGV] [Address not mapped to object] [0x0] [] [] ORA-00600:
> internal error code, arguments: [kghssgai2], [1], [36], [], [], [],
>  [], [] ORA-00600: internal error code, arguments: [kghssgai2], [1],
> [20], [], [], [], [], [] ORA-07445: exception encountered: core dump
> [kkogbro()+2832] [SIGSEGV] [Address not mapped to object] [0x0] []
> [] ORA-00600: internal error code, arguments: [kghssgai2], [5], [36],
>  [], [], [], [], [] ORA-07445: exception encountered: core dump
> [kkogbro()+2832] [SIGSEGV] [Address not mapped to object] [0x0] []
> [] ORA-07445: exception encountered: core dump [kkogbro()+2832]
> [SIGSEGV] [Address not mapped to object] [0x0] [] [] ORA-00600:
> internal error code, arguments: [kghssgai3], [128], [20], [], [], [],
>  [], [] ORA-00600: internal error code, arguments: [kghssgai2], [5],
> [20], [], [], [], [], []
>
> and sometimes it just dies.
> Revert back to native linux, everything works fine.
>
> I haven't had time to test current Xen 2.0.6 (or nightly snapshot) though.
>
> Regards,
>
> Fajar
>
> ------------------------------
>
> Message: 7
> Date: Mon, 20 Jun 2005 20:36:03 -0700
> From: Wim Coekaerts <[hidden email]>
> Subject: Re: [Xen-users] big sized applications in XEN virtual
> machine To: "Fajar A. Nugraha" <[hidden email]> Cc: xen-
[hidden email]

> Message-ID: <[hidden email]>
> Content-Type: text/plain; charset=us-ascii
>
> ve had it running for quite some time without problems. even the middle
> tier stack.
>
> been pretty solid
>
> On Tue, Jun 21, 2005 at 10:19:28AM +0700, Fajar A. Nugraha wrote:
> > Andre Kuester wrote:
> >
> > >So I ask you, if there are any experiences
> > >with that. In special I ask myself, how the removal of the TLS libraries
> > >might
> > >affect performance and stability of those applications.
> > >(Preferred OS is RHEL4)
> > >
> > >
> > >
> > I tried using Oracle 10g on a rather old version of Xen from bk (it
> > still uses kernel 2.6.9) with Lineox 4.
> > TLS libs (/lib/tls, /usr/lib/tls, /usr/X11r6/lib/tls) moved out of the
way.

> > This configuration works great running MTA (mail filtering purposes) and
> > web server (LAMP).
> > However it didn't work quite as expected running Oracle.
> > Oracle runs, but often I would get entries like these on alert log :
> >
> > ORA-07445: exception encountered: core dump [kkogbro()+2832] [SIGSEGV]
> > [Address not mapped to object] [0x0] [] []
> > ORA-00600: internal error code, arguments: [kghssgai2], [1], [36], [],
> > [], [], [], []
> > ORA-00600: internal error code, arguments: [kghssgai2], [1], [20], [],
> > [], [], [], []
> > ORA-07445: exception encountered: core dump [kkogbro()+2832] [SIGSEGV]
> > [Address not mapped to object] [0x0] [] []
> > ORA-00600: internal error code, arguments: [kghssgai2], [5], [36], [],
> > [], [], [], []
> > ORA-07445: exception encountered: core dump [kkogbro()+2832] [SIGSEGV]
> > [Address not mapped to object] [0x0] [] []
> > ORA-07445: exception encountered: core dump [kkogbro()+2832] [SIGSEGV]
> > [Address not mapped to object] [0x0] [] []
> > ORA-00600: internal error code, arguments: [kghssgai3], [128], [20], [],
> > [], [], [], []
> > ORA-00600: internal error code, arguments: [kghssgai2], [5], [20], [],
> > [], [], [], []
> >
> > and sometimes it just dies.
> > Revert back to native linux, everything works fine.
> >
> > I haven't had time to test current Xen 2.0.6 (or nightly snapshot) though.
> >
> > Regards,
> >
> > Fajar
> >
> > _______________________________________________
> > Xen-users mailing list
> > [hidden email]
> > http://lists.xensource.com/xen-users
>
> ------------------------------
>
> Message: 8
> Date: Tue, 21 Jun 2005 11:04:13 +0700
> From: "Fajar A. Nugraha" <[hidden email]>
> Subject: Re: [Xen-users] big sized applications in XEN virtual
> machine To: [hidden email] Message-ID:
<[hidden email]>

> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Wim Coekaerts wrote:
>
> >ve had it running for quite some time without problems. even the middle
> >tier stack.
> >
> >been pretty solid
> >  
> >
> Oracle 10G? On which version of Xen and which Linux distro?
> I'd like to test it again soon.
>
> Regards,
>
> Fajar
>
> ------------------------------
>
> Message: 9
> Date: Tue, 21 Jun 2005 11:47:48 +0100
> From: James Bulpin <[hidden email]>
> Subject: Re: [Xen-users] Xen Install
> To: [hidden email],  [hidden email]
> Message-ID: <[hidden email]>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Please send replies to the list rather than only to me.
>
> Have you installed Twisted?
>
> James
>
> Ramarathnam Sriram wrote:
> > Hi James,
> >      Thanks alot for your prompt response.
> > Now when i boot into my xen-linux2.6.11.10 kernel and give the command
> > xend start i get the following message
> >
> > [root@tfrc1 ~]# xend start
> > Traceback (most recent call last):
> >   File "/usr/sbin/xend", line 27, in ?
> >     from xen.xend.server import SrvDaemon
> >   File "/auto/groups/xeno-xenod/users/xenod/cron-build/R24768.dir/xen-
> > 2.0.bk/dist/install/usr/lib/python/xen/xend/server/SrvDaemon.py", line
20,

> > in ?
> > ImportError: No module named twisted.internet
> > [root@tfrc1 ~]#
> >
> > Please suggest what to do.
> >
> > Thanks
> > Sriram
> >
> >
> > On Mon, 20 Jun 2005 17:01:36 +0100, James Bulpin wrote
> >
> >>Ramarathnam Sriram wrote:
> >>
> >>>Hi,
> >>>  I am trying to install xen on top of Fedora
> >>>I appended the following lines in menu.lst file
> >>>
> >>>  title Xen 2.0 / XenLinux 2.6
> >>>  kernel /boot/xen-2.0.gz dom0_mem=131072
> >>>  module /boot/vmlinuz-2.6-xen0 root=/dev/sda4 ro console=tty0
> >>
> >>This is direct copy from the user manual without modification for
> >>your own system I suspect.
> >>
> >>
> >>>it gives the following errror
> >>>
> >>>Root-NFS: no NFS server available,giving up
> >>>VFS: Unable to mount root fs via NFS,trying floppy
> >>>VFS: Insert root floppy and press enter
> >>>
> >>>
> >>>And when I press enter I see
> >>>kernel panic (not syncing...)
> >>>(I did not catch the rest)
> >>>and it reboots.
> >>>
> >>>also i tried changing root=/dev/hdc since that is what my root is
> >>>inside /etc/fstab.
> >>
> >>No it isn't, according to your followup email:
> >>
> >>   /dev/VolGroup00/LogVol00 /   ext3    defaults        1 1
> >>
> >>You'll need an initrd for the kernel to be able to mount this.
> >>
> >>Boot into native Linux and run as root (I'm assuming XenLinux 2.6.11
> >>- substitute your actual version):
> >>
> >>   mkinitrd /boot/initrd-2.6.11-xen0.img 2.6.11-xen0
> >>
> >>   (you may have to do "depmod -a 2.6.11-xen0" first)
> >>
> >>Append the following line to the Xen entry in your GRUB menu.lst
> >>
> >>   module /boot/initrd-2.6.11-xen0.img
> >>
> >>Change the root= option to root=/dev/VolGroup00/LogVol00
> >>
> >>James
> >
> >
> >
>
> ------------------------------
>
> _______________________________________________
> Xen-users mailing list
> [hidden email]
> http://lists.xensource.com/xen-users
>
> End of Xen-users Digest, Vol 4, Issue 61
> ****************************************


Sriram Ramarathnam,
Graduate Student,Computer Science
Clemson University


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Re: Xen install

Mark Williamson
You need to install the Twisted framework - make install-twisted in the Xen
source 1distribution, or find packages for your distro, or get the code
manually from http://twistedmatrix.com

HTH,
Mark

On Tuesday 21 June 2005 15:03, Ramarathnam Sriram wrote:

> Hi,
>   When i boot into my xen-linux2.6.11.10 kernel and give the command
>   xend start i get the following message
>
> > [root@tfrc1 ~]# xend start
> > Traceback (most recent call last):
> >   File "/usr/sbin/xend", line 27, in ?
> >     from xen.xend.server import SrvDaemon
> >   File "/auto/groups/xeno-xenod/users/xenod/cron-build/R24768.dir/xen-
> > 2.0.bk/dist/install/usr/lib/python/xen/xend/server/SrvDaemon.py", line
> > 20, in ?
> > ImportError: No module named twisted.internet
> > [root@tfrc1 ~]#
> >
> > Please suggest what to do.
> >
> > Thanks
> > Sriram
>
> On Tue, 21 Jun 2005 06:48:20 -0400 (EDT), xen-users-request wrote
>
> > Send Xen-users mailing list submissions to
> > [hidden email]
> >
> > To subscribe or unsubscribe via the World Wide Web, visit
> > http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-users
> > or, via email, send a message with subject or body 'help' to
> > [hidden email]
> >
> > You can reach the person managing the list at
> > [hidden email]
> >
> > When replying, please edit your Subject line so it is more specific
> > than "Re: Contents of Xen-users digest..."
> >
> > Today's Topics:
> >
> >    1. Re: Stable VBD Types (Nils Toedtmann)
> >    2. Kernel panic, unable to mount rootfs (Matthew J. Harmon)
> >    3. Re: Kernel panic, unable to mount rootfs (Matthew J. Harmon)
> >    4. Re: Re: Kernel panic, unable to mount rootfs (Yvette Chanco)
> >    5. big sized applications in XEN virtual machine (Andre Kuester)
> >    6. Re: big sized applications in XEN virtual machine
> >       (Fajar A. Nugraha)
> >
> >    7. Re: big sized applications in XEN virtual machine (Wim
> > Coekaerts)
> >    8. Re: big sized applications in XEN virtual machine
> >       (Fajar A. Nugraha)
> >    9. Re: Xen Install (James Bulpin)
> >
> > ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Tue, 21 Jun 2005 00:10:33 +0200
> > From: Nils Toedtmann <[hidden email]>
> > Subject: Re: [Xen-users] Stable VBD Types
> > To: [hidden email]
> > Cc: [hidden email]
> > Message-ID: <[hidden email]>
> > Content-Type: text/plain
> >
> > Am Montag, den 20.06.2005, 18:11 +0100 schrieb Alex Adranghi:
> > [...]
> >
> > > Thanks. Although this is relevent to what I'm wanting to do, what I
> > > meant to say was using lvm snapshots as a way to reduce common files
> > > from repeating on disk. I quote the LVM-HowTo as it explains it a
> > > little better.
> > >
> > > "It is also useful for creating volumes for use with Xen. You can
> > > create a disk image, then snapshot it and modify the snapshot for a
> > > particular domU instance. You can then create another snapshot of the
> > > original volume, and modify that one for a different domU instance.
> > > Since the only storage used by a snapshot is blocks that were changed
> > > on the origin or the snapshot, the majority of the volume is shared by
> > > the domU's."
> >
> > [...]
> >
> > We use the device-mapper for this. Works for us [tm]:
> >
> >   dd if=/dev/zero of=/tmp/CoW1 bs=1M count=$CoW_SIZE
> >   dd if=/dev/zero of=/tmp/CoW2 bs=1M count=$CoW_SIZE
> >
> >   losetup /dev/loop0 root_fs
> >   losetup /dev/loop1 /tmp/CoW1
> >   losetup /dev/loop2 /tmp/CoW2
> >
> >   BLOCKSIZE=`blockdev --getsize /dev/loop0`
> >
> >   echo "0 $BLOCKSIZE linear                           /dev/loop0
> > 0" \    | dmsetup create rootfs_base
> >
> >   echo "0 $BLOCKSIZE snapshot /dev/mapper/rootfs_base /dev/loop1 p
> > 8" \    | dmsetup create rootfs1
> >
> >   echo "0 $BLOCKSIZE snapshot /dev/mapper/rootfs_base /dev/loop2 p
> > 8" \    | dmsetup create rootfs2
> >
> > You should now be able to use /dev/mapper/rootfs{1|2} read/write.
> > Only diff blocks to "root_fs" get written to "/tmp/CoW{1|2}".
> >
> > This way we boot >20 domUs off one root_fs (after shutdown we delete
> > the CoW files). I have now clue how to do that with LVM[2].
> >
> > /nils.
> >
> > --
> > there is no sig
> >
> > ------------------------------
> >
> > Message: 2
> > Date: Mon, 20 Jun 2005 17:56:17 -0500 (CDT)
> > From: "Matthew J. Harmon" <[hidden email]>
> > Subject: [Xen-users] Kernel panic, unable to mount rootfs
> > To: [hidden email]
> > Message-ID: <[hidden email]>
> > Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
> >
> > Alright, thank you for the "noreboot" kernel option!
> >
> > Here is the full err:
> >
> > Root-NFS: No NFS server available, giving up.
> > VFS: Unable to mount root fs via NFS, trying floppy.
> > VFS: Cannot open root device "sda2" or unknown-block(2,0)
> > Please append a correct "root=" boot option
> > Kernel panic - not syncing: VFS: Unable to mount root fs on
> > unknown-block(2,0)
> >
> > Doing a bit of research on the error message, found the following
> > threads on xen-devel: http://lists.xensource.com/archives/html/xen-
> > devel/2004-10/msg00382.html
> > http://lists.xensource.com/archives/html/xen-devel/2004-12/msg00470.html
> >
> > I'm thinking this might not be a xen problem, but a grub problem?
> >
> > Still working on the issue, any tips would be appreciated.
> >
> > Thanks.
> >
> > -Matthew
> >
> > ------------------------------
> >
> > Message: 3
> > Date: Mon, 20 Jun 2005 18:13:22 -0500 (CDT)
> > From: "Matthew J. Harmon" <[hidden email]>
> > Subject: [Xen-users] Re: Kernel panic, unable to mount rootfs
> > To: [hidden email]
> > Message-ID: <[hidden email]>
> > Content-Type: TEXT/PLAIN; charset=US-ASCII
> >
> > Additionally, the menu.lst for grub is as follows:
> >
> > title Debian GNU/Linux, Xen 2.6.11xen0, testing 2005.06.18
> > kernel=/xen.gz dom0_mem=32768 noreboot
> > root (hd0,0)
> > module=(hd0,0)/xen-linux-2.6.11charliexen0 root=/dev/sda2 ro
> > console=tty0 console=ttyS0 showopts selinux=0
> > ### BEGIN AUTOMAGIC KERNELS LIST
> > ###[snip - all default]
> >
> > -M
> >
> > On Mon, 20 Jun 2005, Matthew J. Harmon wrote:
> >
> > Alright, thank you for the "noreboot" kernel option!
> >
> > Here is the full err:
> >
> > Root-NFS: No NFS server available, giving up.
> > VFS: Unable to mount root fs via NFS, trying floppy.
> > VFS: Cannot open root device "sda2" or unknown-block(2,0)
> > Please append a correct "root=" boot option
> > Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-
> > block(2,0)
> >
> > Doing a bit of research on the error message, found the following
> > threads on xen-devel: http://lists.xensource.com/archives/html/xen-
> > devel/2004-10/msg00382.html
> > http://lists.xensource.com/archives/html/xen-devel/2004-12/msg00470.html
> >
> > I'm thinking this might not be a xen problem, but a grub problem?
> >
> > Still working on the issue, any tips would be appreciated.
> >
> > Thanks.
> >
> > -Matthew
> >
> > ------------------------------
> >
> > Message: 4
> > Date: Mon, 20 Jun 2005 19:28:02 -0500
> > From: Yvette Chanco <[hidden email]>
> > Subject: Re: [Xen-users] Re: Kernel panic, unable to mount rootfs
> > To: "Matthew J. Harmon" <[hidden email]>, [hidden email]
> > Message-ID: <[hidden email]>
> > Content-Type: text/plain; charset=ISO-8859-1
> >
> > If you're getting that far (to starting the dom0) then grub might not
> > directly be the issue. I got that error message when I was using a
> > kernel (for dom0) that hadn't been compiled with support for my scsi
> > adapter. From the looks of your menu.lst, though, it seems you
> > probably did a custom build, so you would know what you included. My
> > only other guess is if there is an initrd image you haven't put in
> > the grub configuration?
> >
> > On 6/20/05, Matthew J. Harmon <[hidden email]> wrote:
> > > Additionally, the menu.lst for grub is as follows:
> > >
> > > title Debian GNU/Linux, Xen 2.6.11xen0, testing 2005.06.18
> > > kernel=/xen.gz dom0_mem=32768 noreboot
> > > root (hd0,0)
> > > module=(hd0,0)/xen-linux-2.6.11charliexen0 root=/dev/sda2 ro
> > > console=tty0 console=ttyS0 showopts selinux=0
> > > ### BEGIN AUTOMAGIC KERNELS LIST
> > > ###[snip - all default]
> > >
> > > -M
> > >
> > > On Mon, 20 Jun 2005, Matthew J. Harmon wrote:
> > >
> > > Alright, thank you for the "noreboot" kernel option!
> > >
> > > Here is the full err:
> > >
> > > Root-NFS: No NFS server available, giving up.
> > > VFS: Unable to mount root fs via NFS, trying floppy.
> > > VFS: Cannot open root device "sda2" or unknown-block(2,0)
> > > Please append a correct "root=" boot option
> > > Kernel panic - not syncing: VFS: Unable to mount root fs on
> > > unknown-block
>
> (2,0)
>
> > > Doing a bit of research on the error message, found the following
> > > threads
>
> on
>
> > > xen-devel:
> > > http://lists.xensource.com/archives/html/xen-devel/2004-10/msg00382.htm
> > >l
> > > http://lists.xensource.com/archives/html/xen-devel/2004-12/msg00470.htm
> > >l
> > >
> > > I'm thinking this might not be a xen problem, but a grub problem?
> > >
> > > Still working on the issue, any tips would be appreciated.
> > >
> > > Thanks.
> > >
> > > -Matthew
> > >
> > > _______________________________________________
> > > Xen-users mailing list
> > > [hidden email]
> > > http://lists.xensource.com/xen-users
> >
> > --
> > -Yvette Chanco
> > www.option-c.com
> >
> > ------------------------------
> >
> > Message: 5
> > Date: Tue, 21 Jun 2005 04:04:45 +0200
> > From: Andre Kuester <[hidden email]>
> > Subject: [Xen-users] big sized applications in XEN virtual machine
> > To: [hidden email]
> > Message-ID: <[hidden email]>
> > Content-Type: text/plain; charset=ISO-8859-1
> >
> > Hi,
> >
> > recently I discovered the exsistance of Xen. I looked a bit around
> > and feel quite impressed by this solution. Then an idea came to my
> > mind, having a partition for a more or less stable server and one
> > for my bleeding edge desktop playground. I think I am not the only
> > one with that ;) But I dont want to use the typical lamp server
> > config, I thought more about a massive database server, such as DB2
> > together with a recent version of SAP Netweaver. Both of them are
> > quite memory and of course IO-hungry. I have decent hardware to run
> > that, but I couldnt found any experience report about such a xen-DB2-
> > SAP combination. So I ask you, if there are any experiences with
> > that. In special I ask myself, how the removal of the TLS libraries might
> > affect performance and stability of those applications.
> > (Preferred OS is RHEL4)
> >
> > I would be glad to hear some hints or experiences.
> >
> > Thanks & Regards,
> > Andre.
> >
> > ------------------------------
> >
> > Message: 6
> > Date: Tue, 21 Jun 2005 10:19:28 +0700
> > From: "Fajar A. Nugraha" <[hidden email]>
> > Subject: Re: [Xen-users] big sized applications in XEN virtual
> > machine To: [hidden email] Message-ID:
>
> <[hidden email]>
>
> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> >
> > Andre Kuester wrote:
> > >So I ask you, if there are any experiences
> > >with that. In special I ask myself, how the removal of the TLS libraries
>
> might
>
> > >affect performance and stability of those applications.
> > >(Preferred OS is RHEL4)
> >
> > I tried using Oracle 10g on a rather old version of Xen from bk (it
> > still uses kernel 2.6.9) with Lineox 4.
> > TLS libs (/lib/tls, /usr/lib/tls, /usr/X11r6/lib/tls) moved out of
> > the way. This configuration works great running MTA (mail filtering
> > purposes) and web server (LAMP). However it didn't work quite as
> > expected running Oracle. Oracle runs, but often I would get entries
> > like these on alert log :
> >
> > ORA-07445: exception encountered: core dump [kkogbro()+2832]
> > [SIGSEGV] [Address not mapped to object] [0x0] [] [] ORA-00600:
> > internal error code, arguments: [kghssgai2], [1], [36], [], [], [],
> >  [], [] ORA-00600: internal error code, arguments: [kghssgai2], [1],
> > [20], [], [], [], [], [] ORA-07445: exception encountered: core dump
> > [kkogbro()+2832] [SIGSEGV] [Address not mapped to object] [0x0] []
> > [] ORA-00600: internal error code, arguments: [kghssgai2], [5], [36],
> >  [], [], [], [], [] ORA-07445: exception encountered: core dump
> > [kkogbro()+2832] [SIGSEGV] [Address not mapped to object] [0x0] []
> > [] ORA-07445: exception encountered: core dump [kkogbro()+2832]
> > [SIGSEGV] [Address not mapped to object] [0x0] [] [] ORA-00600:
> > internal error code, arguments: [kghssgai3], [128], [20], [], [], [],
> >  [], [] ORA-00600: internal error code, arguments: [kghssgai2], [5],
> > [20], [], [], [], [], []
> >
> > and sometimes it just dies.
> > Revert back to native linux, everything works fine.
> >
> > I haven't had time to test current Xen 2.0.6 (or nightly snapshot)
> > though.
> >
> > Regards,
> >
> > Fajar
> >
> > ------------------------------
> >
> > Message: 7
> > Date: Mon, 20 Jun 2005 20:36:03 -0700
> > From: Wim Coekaerts <[hidden email]>
> > Subject: Re: [Xen-users] big sized applications in XEN virtual
> > machine To: "Fajar A. Nugraha" <[hidden email]> Cc: xen-
>
> [hidden email]
>
> > Message-ID: <[hidden email]>
> > Content-Type: text/plain; charset=us-ascii
> >
> > ve had it running for quite some time without problems. even the middle
> > tier stack.
> >
> > been pretty solid
> >
> > On Tue, Jun 21, 2005 at 10:19:28AM +0700, Fajar A. Nugraha wrote:
> > > Andre Kuester wrote:
> > > >So I ask you, if there are any experiences
> > > >with that. In special I ask myself, how the removal of the TLS
> > > > libraries might
> > > >affect performance and stability of those applications.
> > > >(Preferred OS is RHEL4)
> > >
> > > I tried using Oracle 10g on a rather old version of Xen from bk (it
> > > still uses kernel 2.6.9) with Lineox 4.
> > > TLS libs (/lib/tls, /usr/lib/tls, /usr/X11r6/lib/tls) moved out of the
>
> way.
>
> > > This configuration works great running MTA (mail filtering purposes)
> > > and web server (LAMP).
> > > However it didn't work quite as expected running Oracle.
> > > Oracle runs, but often I would get entries like these on alert log :
> > >
> > > ORA-07445: exception encountered: core dump [kkogbro()+2832] [SIGSEGV]
> > > [Address not mapped to object] [0x0] [] []
> > > ORA-00600: internal error code, arguments: [kghssgai2], [1], [36], [],
> > > [], [], [], []
> > > ORA-00600: internal error code, arguments: [kghssgai2], [1], [20], [],
> > > [], [], [], []
> > > ORA-07445: exception encountered: core dump [kkogbro()+2832] [SIGSEGV]
> > > [Address not mapped to object] [0x0] [] []
> > > ORA-00600: internal error code, arguments: [kghssgai2], [5], [36], [],
> > > [], [], [], []
> > > ORA-07445: exception encountered: core dump [kkogbro()+2832] [SIGSEGV]
> > > [Address not mapped to object] [0x0] [] []
> > > ORA-07445: exception encountered: core dump [kkogbro()+2832] [SIGSEGV]
> > > [Address not mapped to object] [0x0] [] []
> > > ORA-00600: internal error code, arguments: [kghssgai3], [128], [20],
> > > [], [], [], [], []
> > > ORA-00600: internal error code, arguments: [kghssgai2], [5], [20], [],
> > > [], [], [], []
> > >
> > > and sometimes it just dies.
> > > Revert back to native linux, everything works fine.
> > >
> > > I haven't had time to test current Xen 2.0.6 (or nightly snapshot)
> > > though.
> > >
> > > Regards,
> > >
> > > Fajar
> > >
> > > _______________________________________________
> > > Xen-users mailing list
> > > [hidden email]
> > > http://lists.xensource.com/xen-users
> >
> > ------------------------------
> >
> > Message: 8
> > Date: Tue, 21 Jun 2005 11:04:13 +0700
> > From: "Fajar A. Nugraha" <[hidden email]>
> > Subject: Re: [Xen-users] big sized applications in XEN virtual
> > machine To: [hidden email] Message-ID:
>
> <[hidden email]>
>
> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> >
> > Wim Coekaerts wrote:
> > >ve had it running for quite some time without problems. even the middle
> > >tier stack.
> > >
> > >been pretty solid
> >
> > Oracle 10G? On which version of Xen and which Linux distro?
> > I'd like to test it again soon.
> >
> > Regards,
> >
> > Fajar
> >
> > ------------------------------
> >
> > Message: 9
> > Date: Tue, 21 Jun 2005 11:47:48 +0100
> > From: James Bulpin <[hidden email]>
> > Subject: Re: [Xen-users] Xen Install
> > To: [hidden email],  [hidden email]
> > Message-ID: <[hidden email]>
> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> >
> > Please send replies to the list rather than only to me.
> >
> > Have you installed Twisted?
> >
> > James
> >
> > Ramarathnam Sriram wrote:
> > > Hi James,
> > >      Thanks alot for your prompt response.
> > > Now when i boot into my xen-linux2.6.11.10 kernel and give the command
> > > xend start i get the following message
> > >
> > > [root@tfrc1 ~]# xend start
> > > Traceback (most recent call last):
> > >   File "/usr/sbin/xend", line 27, in ?
> > >     from xen.xend.server import SrvDaemon
> > >   File "/auto/groups/xeno-xenod/users/xenod/cron-build/R24768.dir/xen-
> > > 2.0.bk/dist/install/usr/lib/python/xen/xend/server/SrvDaemon.py", line
>
> 20,
>
> > > in ?
> > > ImportError: No module named twisted.internet
> > > [root@tfrc1 ~]#
> > >
> > > Please suggest what to do.
> > >
> > > Thanks
> > > Sriram
> > >
> > >
> > > On Mon, 20 Jun 2005 17:01:36 +0100, James Bulpin wrote
> > >
> > >>Ramarathnam Sriram wrote:
> > >>>Hi,
> > >>>  I am trying to install xen on top of Fedora
> > >>>I appended the following lines in menu.lst file
> > >>>
> > >>>  title Xen 2.0 / XenLinux 2.6
> > >>>  kernel /boot/xen-2.0.gz dom0_mem=131072
> > >>>  module /boot/vmlinuz-2.6-xen0 root=/dev/sda4 ro console=tty0
> > >>
> > >>This is direct copy from the user manual without modification for
> > >>your own system I suspect.
> > >>
> > >>>it gives the following errror
> > >>>
> > >>>Root-NFS: no NFS server available,giving up
> > >>>VFS: Unable to mount root fs via NFS,trying floppy
> > >>>VFS: Insert root floppy and press enter
> > >>>
> > >>>
> > >>>And when I press enter I see
> > >>>kernel panic (not syncing...)
> > >>>(I did not catch the rest)
> > >>>and it reboots.
> > >>>
> > >>>also i tried changing root=/dev/hdc since that is what my root is
> > >>>inside /etc/fstab.
> > >>
> > >>No it isn't, according to your followup email:
> > >>
> > >>   /dev/VolGroup00/LogVol00 /   ext3    defaults        1 1
> > >>
> > >>You'll need an initrd for the kernel to be able to mount this.
> > >>
> > >>Boot into native Linux and run as root (I'm assuming XenLinux 2.6.11
> > >>- substitute your actual version):
> > >>
> > >>   mkinitrd /boot/initrd-2.6.11-xen0.img 2.6.11-xen0
> > >>
> > >>   (you may have to do "depmod -a 2.6.11-xen0" first)
> > >>
> > >>Append the following line to the Xen entry in your GRUB menu.lst
> > >>
> > >>   module /boot/initrd-2.6.11-xen0.img
> > >>
> > >>Change the root= option to root=/dev/VolGroup00/LogVol00
> > >>
> > >>James
> >
> > ------------------------------
> >
> > _______________________________________________
> > Xen-users mailing list
> > [hidden email]
> > http://lists.xensource.com/xen-users
> >
> > End of Xen-users Digest, Vol 4, Issue 61
> > ****************************************
>
> Sriram Ramarathnam,
> Graduate Student,Computer Science
> Clemson University
>
>
> _______________________________________________
> Xen-users mailing list
> [hidden email]
> http://lists.xensource.com/xen-users

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Re: Xen install

Ramarathnam Sriram
In reply to this post by Ramarathnam Sriram

Hi,

Now when i do xend start after booting into my Xen-linux kernel, i get the follwing error.

Traceback (most recent call last):
  File "/usr/sbin/xend", line 27, in ?
    from xen.xend.server import SrvDaemon
  File "/auto/groups/xeno-xenod/users/xenod/cron-build/R24768.dir/xen-2.0.bk/dist/install/usr/lib/python/xen/xend/server/SrvDaemon.py", line 35, in ?
  File "/auto/groups/xeno-xenod/users/xenod/cron-build/R24768.dir/xen-2.0.bk/dist/install/usr/lib/python/xen/xend/server/SrvServer.py", line 28, in ?
ImportError: No module named web
[root@tfrc1 ~]#

please suggest what to do.

Thanks

Sriram

On Tue, 21 Jun 2005 11:06:44 -0400 (EDT), Daniel Paquet wrote


> You need the python module twisted, to install it you can get the Xen sources uncompress them and type make install-twisted.
>
> > Hi,
> > When i boot into my xen-linux2.6.11.10 kernel and give the command
> > xend start i get the following message
> >>
> >> [root@tfrc1 ~]# xend start
> >> Traceback (most recent call last):
> >> File "/usr/sbin/xend", line 27, in ?
> >> from xen.xend.server import SrvDaemon
> >> File "/auto/groups/xeno-xenod/users/xenod/cron-build/R24768.dir/xen-
> >> 2.0.bk/dist/install/usr/lib/python/xen/xend/server/SrvDaemon.py", line
> >> 20,
> >> in ?
> >> ImportError: No module named twisted.internet
> >> [root@tfrc1 ~]#
> >>
> >> Please suggest what to do.
> >>
> >> Thanks
> >> Sriram
> >
> >
> > On Tue, 21 Jun 2005 06:48:20 -0400 (EDT), xen-users-request wrote
> >> Send Xen-users mailing list submissions to
> >> [hidden email]
> >>
> >> To subscribe or unsubscribe via the World Wide Web, visit
> >> http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-users
> >> or, via email, send a message with subject or body 'help' to
> >> [hidden email]
> >>
> >> You can reach the person managing the list at
> >> [hidden email]
> >>
> >> When replying, please edit your Subject line so it is more specific
> >> than "Re: Contents of Xen-users digest..."
> >>
> >> Today's Topics:
> >>
> >> 1. Re: Stable VBD Types (Nils Toedtmann)
> >> 2. Kernel panic, unable to mount rootfs (Matthew J. Harmon)
> >> 3. Re: Kernel panic, unable to mount rootfs (Matthew J. Harmon)
> >> 4. Re: Re: Kernel panic, unable to mount rootfs (Yvette Chanco)
> >> 5. big sized applications in XEN virtual machine (Andre Kuester)
> >> 6. Re: big sized applications in XEN virtual machine
> >> (Fajar A. Nugraha)
> >>
> >> 7. Re: big sized applications in XEN virtual machine (Wim
> >> Coekaerts)
> >> 8. Re: big sized applications in XEN virtual machine
> >> (Fajar A. Nugraha)
> >> 9. Re: Xen Install (James Bulpin)
> >>
> >> ----------------------------------------------------------------------
> >>
> >> Message: 1
> >> Date: Tue, 21 Jun 2005 00:10:33 +0200
> >> From: Nils Toedtmann <[hidden email]>
> >> Subject: Re: [Xen-users] Stable VBD Types
> >> To: [hidden email]
> >> Cc: [hidden email]
> >> Message-ID: <[hidden email]>
> >> Content-Type: text/plain
> >>
> >> Am Montag, den 20.06.2005, 18:11 +0100 schrieb Alex Adranghi:
> >> [...]
> >> > Thanks. Although this is relevent to what I'm wanting to do, what I
> >> > meant to say was using lvm snapshots as a way to reduce common files
> >> > from repeating on disk. I quote the LVM-HowTo as it explains it a
> >> little
> >> > better.
> >> >
> >> > "It is also useful for creating volumes for use with Xen. You can
> >> create
> >> > a disk image, then snapshot it and modify the snapshot for a
> >> particular
> >> > domU instance. You can then create another snapshot of the original
> >> > volume, and modify that one for a different domU instance. Since the
> >> > only storage used by a snapshot is blocks that were changed on the
> >> > origin or the snapshot, the majority of the volume is shared by the
> >> > domU's."
> >> [...]
> >>
> >> We use the device-mapper for this. Works for us [tm]:
> >>
> >> dd if=/dev/zero of=/tmp/CoW1 bs=1M count=$CoW_SIZE
> >> dd if=/dev/zero of=/tmp/CoW2 bs=1M count=$CoW_SIZE
> >>
> >> losetup /dev/loop0 root_fs
> >> losetup /dev/loop1 /tmp/CoW1
> >> losetup /dev/loop2 /tmp/CoW2
> >>
> >> BLOCKSIZE=`blockdev --getsize /dev/loop0`
> >>
> >> echo "0 $BLOCKSIZE linear /dev/loop0
> >> 0" \ | dmsetup create rootfs_base
> >>
> >> echo "0 $BLOCKSIZE snapshot /dev/mapper/rootfs_base /dev/loop1 p
> >> 8" \ | dmsetup create rootfs1
> >>
> >> echo "0 $BLOCKSIZE snapshot /dev/mapper/rootfs_base /dev/loop2 p
> >> 8" \ | dmsetup create rootfs2
> >>
> >> You should now be able to use /dev/mapper/rootfs{1|2} read/write.
> >> Only diff blocks to "root_fs" get written to "/tmp/CoW{1|2}".
> >>
> >> This way we boot >20 domUs off one root_fs (after shutdown we delete
> >> the CoW files). I have now clue how to do that with LVM[2].
> >>
> >> /nils.
> >>
> >> --
> >> there is no sig
> >>
> >> ------------------------------
> >>
> >> Message: 2
> >> Date: Mon, 20 Jun 2005 17:56:17 -0500 (CDT)
> >> From: "Matthew J. Harmon" <[hidden email]>
> >> Subject: [Xen-users] Kernel panic, unable to mount rootfs
> >> To: [hidden email]
> >> Message-ID: <[hidden email]>
> >> Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
> >>
> >> Alright, thank you for the "noreboot" kernel option!
> >>
> >> Here is the full err:
> >>
> >> Root-NFS: No NFS server available, giving up.
> >> VFS: Unable to mount root fs via NFS, trying floppy.
> >> VFS: Cannot open root device "sda2" or unknown-block(2,0)
> >> Please append a correct "root=" boot option
> >> Kernel panic - not syncing: VFS: Unable to mount root fs on
> >> unknown-block(2,0)
> >>
> >> Doing a bit of research on the error message, found the following
> >> threads on xen-devel: http://lists.xensource.com/archives/html/xen-
> >> devel/2004-10/msg00382.html
> >> http://lists.xensource.com/archives/html/xen-devel/2004-12/msg00470.html
> >>
> >> I'm thinking this might not be a xen problem, but a grub problem?
> >>
> >> Still working on the issue, any tips would be appreciated.
> >>
> >> Thanks.
> >>
> >> -Matthew
> >>
> >> ------------------------------
> >>
> >> Message: 3
> >> Date: Mon, 20 Jun 2005 18:13:22 -0500 (CDT)
> >> From: "Matthew J. Harmon" <[hidden email]>
> >> Subject: [Xen-users] Re: Kernel panic, unable to mount rootfs
> >> To: [hidden email]
> >> Message-ID: <[hidden email]>
> >> Content-Type: TEXT/PLAIN; charset=US-ASCII
> >>
> >> Additionally, the menu.lst for grub is as follows:
> >>
> >> title Debian GNU/Linux, Xen 2.6.11xen0, testing 2005.06.18
> >> kernel=/xen.gz dom0_mem=32768 noreboot
> >> root (hd0,0)
> >> module=(hd0,0)/xen-linux-2.6.11charliexen0 root=/dev/sda2 ro
> >> console=tty0 console=ttyS0 showopts selinux=0
> >> ### BEGIN AUTOMAGIC KERNELS LIST
> >> ###[snip - all default]
> >>
> >> -M
> >>
> >> On Mon, 20 Jun 2005, Matthew J. Harmon wrote:
> >>
> >> Alright, thank you for the "noreboot" kernel option!
> >>
> >> Here is the full err:
> >>
> >> Root-NFS: No NFS server available, giving up.
> >> VFS: Unable to mount root fs via NFS, trying floppy.
> >> VFS: Cannot open root device "sda2" or unknown-block(2,0)
> >> Please append a correct "root=" boot option
> >> Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-
> >> block(2,0)
> >>
> >> Doing a bit of research on the error message, found the following
> >> threads on xen-devel: http://lists.xensource.com/archives/html/xen-
> >> devel/2004-10/msg00382.html
> >> http://lists.xensource.com/archives/html/xen-devel/2004-12/msg00470.html
> >>
> >> I'm thinking this might not be a xen problem, but a grub problem?
> >>
> >> Still working on the issue, any tips would be appreciated.
> >>
> >> Thanks.
> >>
> >> -Matthew
> >>
> >> ------------------------------
> >>
> >> Message: 4
> >> Date: Mon, 20 Jun 2005 19:28:02 -0500
> >> From: Yvette Chanco <[hidden email]>
> >> Subject: Re: [Xen-users] Re: Kernel panic, unable to mount rootfs
> >> To: "Matthew J. Harmon" <[hidden email]>, [hidden email]
> >> Message-ID: <[hidden email]>
> >> Content-Type: text/plain; charset=ISO-8859-1
> >>
> >> If you're getting that far (to starting the dom0) then grub might not
> >> directly be the issue. I got that error message when I was using a
> >> kernel (for dom0) that hadn't been compiled with support for my scsi
> >> adapter. From the looks of your menu.lst, though, it seems you
> >> probably did a custom build, so you would know what you included. My
> >> only other guess is if there is an initrd image you haven't put in
> >> the grub configuration?
> >>
> >> On 6/20/05, Matthew J. Harmon <[hidden email]> wrote:
> >> > Additionally, the menu.lst for grub is as follows:
> >> >
> >> > title Debian GNU/Linux, Xen 2.6.11xen0, testing 2005.06.18
> >> > kernel=/xen.gz dom0_mem=32768 noreboot
> >> > root (hd0,0)
> >> > module=(hd0,0)/xen-linux-2.6.11charliexen0 root=/dev/sda2 ro
> >> console=tty0
> >> > console=ttyS0 showopts selinux=0
> >> > ### BEGIN AUTOMAGIC KERNELS LIST
> >> > ###[snip - all default]
> >> >
> >> > -M
> >> >
> >> > On Mon, 20 Jun 2005, Matthew J. Harmon wrote:
> >> >
> >> > Alright, thank you for the "noreboot" kernel option!
> >> >
> >> > Here is the full err:
> >> >
> >> > Root-NFS: No NFS server available, giving up.
> >> > VFS: Unable to mount root fs via NFS, trying floppy.
> >> > VFS: Cannot open root device "sda2" or unknown-block(2,0)
> >> > Please append a correct "root=" boot option
> >> > Kernel panic - not syncing: VFS: Unable to mount root fs on
> >> unknown-block
> > (2,0)
> >> >
> >> > Doing a bit of research on the error message, found the following
> >> threads
> > on
> >> > xen-devel:
> >> > http://lists.xensource.com/archives/html/xen-devel/2004-10/msg00382.html
> >> > http://lists.xensource.com/archives/html/xen-devel/2004-12/msg00470.html
> >> >
> >> > I'm thinking this might not be a xen problem, but a grub problem?
> >> >
> >> > Still working on the issue, any tips would be appreciated.
> >> >
> >> > Thanks.
> >> >
> >> > -Matthew
> >> >
> >> > _______________________________________________
> >> > Xen-users mailing list
> >> > [hidden email]
> >> > http://lists.xensource.com/xen-users
> >> >
> >>
> >> --
> >> -Yvette Chanco
> >> www.option-c.com
> >>
> >> ------------------------------
> >>
> >> Message: 5
> >> Date: Tue, 21 Jun 2005 04:04:45 +0200
> >> From: Andre Kuester <[hidden email]>
> >> Subject: [Xen-users] big sized applications in XEN virtual machine
> >> To: [hidden email]
> >> Message-ID: <[hidden email]>
> >> Content-Type: text/plain; charset=ISO-8859-1
> >>
> >> Hi,
> >>
> >> recently I discovered the exsistance of Xen. I looked a bit around
> >> and feel quite impressed by this solution. Then an idea came to my
> >> mind, having a partition for a more or less stable server and one
> >> for my bleeding edge desktop playground. I think I am not the only
> >> one with that ;) But I dont want to use the typical lamp server
> >> config, I thought more about a massive database server, such as DB2
> >> together with a recent version of SAP Netweaver. Both of them are
> >> quite memory and of course IO-hungry. I have decent hardware to run
> >> that, but I couldnt found any experience report about such a xen-DB2-
> >> SAP combination. So I ask you, if there are any experiences with
> >> that. In special I ask myself, how the removal of the TLS libraries
> >> might
> >> affect performance and stability of those applications.
> >> (Preferred OS is RHEL4)
> >>
> >> I would be glad to hear some hints or experiences.
> >>
> >> Thanks & Regards,
> >> Andre.
> >>
> >> ------------------------------
> >>
> >> Message: 6
> >> Date: Tue, 21 Jun 2005 10:19:28 +0700
> >> From: "Fajar A. Nugraha" <[hidden email]>
> >> Subject: Re: [Xen-users] big sized applications in XEN virtual
> >> machine To: [hidden email] Message-ID:
> > <[hidden email]>
> >> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> >>
> >> Andre Kuester wrote:
> >>
> >> >So I ask you, if there are any experiences
> >> >with that. In special I ask myself, how the removal of the TLS
> >> libraries
> > might
> >> >affect performance and stability of those applications.
> >> >(Preferred OS is RHEL4)
> >> >
> >> >
> >> >
> >> I tried using Oracle 10g on a rather old version of Xen from bk (it
> >> still uses kernel 2.6.9) with Lineox 4.
> >> TLS libs (/lib/tls, /usr/lib/tls, /usr/X11r6/lib/tls) moved out of
> >> the way. This configuration works great running MTA (mail filtering
> >> purposes) and web server (LAMP). However it didn't work quite as
> >> expected running Oracle. Oracle runs, but often I would get entries
> >> like these on alert log :
> >>
> >> ORA-07445: exception encountered: core dump [kkogbro()+2832]
> >> [SIGSEGV] [Address not mapped to object] [0x0] [] [] ORA-00600:
> >> internal error code, arguments: [kghssgai2], [1], [36], [], [], [],
> >> [], [] ORA-00600: internal error code, arguments: [kghssgai2], [1],
> >> [20], [], [], [], [], [] ORA-07445: exception encountered: core dump
> >> [kkogbro()+2832] [SIGSEGV] [Address not mapped to object] [0x0] []
> >> [] ORA-00600: internal error code, arguments: [kghssgai2], [5], [36],
> >> [], [], [], [], [] ORA-07445: exception encountered: core dump
> >> [kkogbro()+2832] [SIGSEGV] [Address not mapped to object] [0x0] []
> >> [] ORA-07445: exception encountered: core dump [kkogbro()+2832]
> >> [SIGSEGV] [Address not mapped to object] [0x0] [] [] ORA-00600:
> >> internal error code, arguments: [kghssgai3], [128], [20], [], [], [],
> >> [], [] ORA-00600: internal error code, arguments: [kghssgai2], [5],
> >> [20], [], [], [], [], []
> >>
> >> and sometimes it just dies.
> >> Revert back to native linux, everything works fine.
> >>
> >> I haven't had time to test current Xen 2.0.6 (or nightly snapshot)
> >> though.
> >>
> >> Regards,
> >>
> >> Fajar
> >>
> >> ------------------------------
> >>
> >> Message: 7
> >> Date: Mon, 20 Jun 2005 20:36:03 -0700
> >> From: Wim Coekaerts <[hidden email]>
> >> Subject: Re: [Xen-users] big sized applications in XEN virtual
> >> machine To: "Fajar A. Nugraha" <[hidden email]> Cc: xen-
> > [hidden email]
> >> Message-ID: <[hidden email]>
> >> Content-Type: text/plain; charset=us-ascii
> >>
> >> ve had it running for quite some time without problems. even the middle
> >> tier stack.
> >>
> >> been pretty solid
> >>
> >> On Tue, Jun 21, 2005 at 10:19:28AM +0700, Fajar A. Nugraha wrote:
> >> > Andre Kuester wrote:
> >> >
> >> > >So I ask you, if there are any experiences
> >> > >with that. In special I ask myself, how the removal of the TLS
> >> libraries
> >> > >might
> >> > >affect performance and stability of those applications.
> >> > >(Preferred OS is RHEL4)
> >> > >
> >> > >
> >> > >
> >> > I tried using Oracle 10g on a rather old version of Xen from bk (it
> >> > still uses kernel 2.6.9) with Lineox 4.
> >> > TLS libs (/lib/tls, /usr/lib/tls, /usr/X11r6/lib/tls) moved out of the
> > way.
> >> > This configuration works great running MTA (mail filtering purposes)
> >> and
> >> > web server (LAMP).
> >> > However it didn't work quite as expected running Oracle.
> >> > Oracle runs, but often I would get entries like these on alert log :
> >> >
> >> > ORA-07445: exception encountered: core dump [kkogbro()+2832] [SIGSEGV]
> >> > [Address not mapped to object] [0x0] [] []
> >> > ORA-00600: internal error code, arguments: [kghssgai2], [1], [36], [],
> >> > [], [], [], []
> >> > ORA-00600: internal error code, arguments: [kghssgai2], [1], [20], [],
> >> > [], [], [], []
> >> > ORA-07445: exception encountered: core dump [kkogbro()+2832] [SIGSEGV]
> >> > [Address not mapped to object] [0x0] [] []
> >> > ORA-00600: internal error code, arguments: [kghssgai2], [5], [36], [],
> >> > [], [], [], []
> >> > ORA-07445: exception encountered: core dump [kkogbro()+2832] [SIGSEGV]
> >> > [Address not mapped to object] [0x0] [] []
> >> > ORA-07445: exception encountered: core dump [kkogbro()+2832] [SIGSEGV]
> >> > [Address not mapped to object] [0x0] [] []
> >> > ORA-00600: internal error code, arguments: [kghssgai3], [128], [20],
> >> [],
> >> > [], [], [], []
> >> > ORA-00600: internal error code, arguments: [kghssgai2], [5], [20], [],
> >> > [], [], [], []
> >> >
> >> > and sometimes it just dies.
> >> > Revert back to native linux, everything works fine.
> >> >
> >> > I haven't had time to test current Xen 2.0.6 (or nightly snapshot)
> >> though.
> >> >
> >> > Regards,
> >> >
> >> > Fajar
> >> >
> >> > _______________________________________________
> >> > Xen-users mailing list
> >> > [hidden email]
> >> > http://lists.xensource.com/xen-users
> >>
> >> ------------------------------
> >>
> >> Message: 8
> >> Date: Tue, 21 Jun 2005 11:04:13 +0700
> >> From: "Fajar A. Nugraha" <[hidden email]>
> >> Subject: Re: [Xen-users] big sized applications in XEN virtual
> >> machine To: [hidden email] Message-ID:
> > <[hidden email]>
> >> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> >>
> >> Wim Coekaerts wrote:
> >>
> >> >ve had it running for quite some time without problems. even the middle
> >> >tier stack.
> >> >
> >> >been pretty solid
> >> >
> >> >
> >> Oracle 10G? On which version of Xen and which Linux distro?
> >> I'd like to test it again soon.
> >>
> >> Regards,
> >>
> >> Fajar
> >>
> >> ------------------------------
> >>
> >> Message: 9
> >> Date: Tue, 21 Jun 2005 11:47:48 +0100
> >> From: James Bulpin <[hidden email]>
> >> Subject: Re: [Xen-users] Xen Install
> >> To: [hidden email], [hidden email]
> >> Message-ID: <[hidden email]>
> >> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> >>
> >> Please send replies to the list rather than only to me.
> >>
> >> Have you installed Twisted?
> >>
> >> James
> >>
> >> Ramarathnam Sriram wrote:
> >> > Hi James,
> >> > Thanks alot for your prompt response.
> >> > Now when i boot into my xen-linux2.6.11.10 kernel and give the command
> >> > xend start i get the following message
> >> >
> >> > [root@tfrc1 ~]# xend start
> >> > Traceback (most recent call last):
> >> > File "/usr/sbin/xend", line 27, in ?
> >> > from xen.xend.server import SrvDaemon
> >> > File "/auto/groups/xeno-xenod/users/xenod/cron-build/R24768.dir/xen-
> >> > 2.0.bk/dist/install/usr/lib/python/xen/xend/server/SrvDaemon.py", line
> > 20,
> >> > in ?
> >> > ImportError: No module named twisted.internet
> >> > [root@tfrc1 ~]#
> >> >
> >> > Please suggest what to do.
> >> >
> >> > Thanks
> >> > Sriram
> >> >
> >> >
> >> > On Mon, 20 Jun 2005 17:01:36 +0100, James Bulpin wrote
> >> >
> >> >>Ramarathnam Sriram wrote:
> >> >>
> >> >>>Hi,
> >> >>> I am trying to install xen on top of Fedora
> >> >>>I appended the following lines in menu.lst file
> >> >>>
> >> >>> title Xen 2.0 / XenLinux 2.6
> >> >>> kernel /boot/xen-2.0.gz dom0_mem=131072
> >> >>> module /boot/vmlinuz-2.6-xen0 root=/dev/sda4 ro console=tty0
> >> >>
> >> >>This is direct copy from the user manual without modification for
> >> >>your own system I suspect.
> >> >>
> >> >>
> >> >>>it gives the following errror
> >> >>>
> >> >>>Root-NFS: no NFS server available,giving up
> >> >>>VFS: Unable to mount root fs via NFS,trying floppy
> >> >>>VFS: Insert root floppy and press enter
> >> >>>
> >> >>>
> >> >>>And when I press enter I see
> >> >>>kernel panic (not syncing...)
> >> >>>(I did not catch the rest)
> >> >>>and it reboots.
> >> >>>
> >> >>>also i tried changing root=/dev/hdc since that is what my root is
> >> >>>inside /etc/fstab.
> >> >>
> >> >>No it isn't, according to your followup email:
> >> >>
> >> >> /dev/VolGroup00/LogVol00 / ext3 defaults 1 1
> >> >>
> >> >>You'll need an initrd for the kernel to be able to mount this.
> >> >>
> >> >>Boot into native Linux and run as root (I'm assuming XenLinux 2.6.11
> >> >>- substitute your actual version):
> >> >>
> >> >> mkinitrd /boot/initrd-2.6.11-xen0.img 2.6.11-xen0
> >> >>
> >> >> (you may have to do "depmod -a 2.6.11-xen0" first)
> >> >>
> >> >>Append the following line to the Xen entry in your GRUB menu.lst
> >> >>
> >> >> module /boot/initrd-2.6.11-xen0.img
> >> >>
> >> >>Change the root= option to root=/dev/VolGroup00/LogVol00
> >> >>
> >> >>James
> >> >
> >> >
> >> >
> >>
> >> ------------------------------
> >>
> >> _______________________________________________
> >> Xen-users mailing list
> >> [hidden email]
> >> http://lists.xensource.com/xen-users
> >>
> >> End of Xen-users Digest, Vol 4, Issue 61
> >> ****************************************
> >
> >
> > Sriram Ramarathnam,
> > Graduate Student,Computer Science
> > Clemson University
> >
> >
> > _______________________________________________
> > Xen-users mailing list
> > [hidden email]
> > http://lists.xensource.com/xen-users
> >
> > !DSPAM:42b81e38311831796990570!
> >
> >
> >
>
> --
> Daniel Paquet
> Administrateur Systèmes
> Consultant et revendeur autorisé Linspire
>
> --
> Vous avez des besoins en informatique?
> Contactez-moi!
>
> Bientôt disponible Linspire en Français,
> débarrassez vous des virus et "spyware"!


Sriram Ramarathnam,
Graduate Student,Computer Science
Clemson University


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Re: Xen install

James Bulpin-2
It looks like the new version 2.x of Twisted has separated the
twisted.web part of the library out into a separate package "Twisted
Web". Which version of Twisted are you using? I'd suggest sticking with
1.3 for now.

Has anyone tried using Twisted 2.x + Twisted Web with xend?

James

Ramarathnam Sriram wrote:

> *Hi,*
>
> *Now when i do xend start after booting into my Xen-linux kernel, i get
> the follwing error.*
>
> *Traceback (most recent call last):
>   File "/usr/sbin/xend", line 27, in ?
>     from xen.xend.server import SrvDaemon
>   File
> "/auto/groups/xeno-xenod/users/xenod/cron-build/R24768.dir/xen-2.0.bk/dist/install/usr/lib/python/xen/xend/server/SrvDaemon.py",
> line 35, in ?
>   File
> "/auto/groups/xeno-xenod/users/xenod/cron-build/R24768.dir/xen-2.0.bk/dist/install/usr/lib/python/xen/xend/server/SrvServer.py",
> line 28, in ?
> ImportError: No module named web
> [root@tfrc1 ~]#
> *
>
> *please suggest what to do.*
>
> *Thanks*
>
> *Sriram*
>
> **
>
> *On Tue, 21 Jun 2005 11:06:44 -0400 (EDT), Daniel Paquet wrote*
>  > You need the python module twisted, to install it you can get the Xen
> sources uncompress them and type make install-twisted.
>  >
>  > > Hi,
>  > > When i boot into my xen-linux2.6.11.10 kernel and give the command
>  > > xend start i get the following message
>  > >>
>  > >> [root@tfrc1 ~]# xend start
>  > >> Traceback (most recent call last):
>  > >> File "/usr/sbin/xend", line 27, in ?
>  > >> from xen.xend.server import SrvDaemon
>  > >> File "/auto/groups/xeno-xenod/users/xenod/cron-build/R24768.dir/xen-
>  > >> 2.0.bk/dist/install/usr/lib/python/xen/xend/server/SrvDaemon.py",
> line
>  > >> 20,
>  > >> in ?
>  > >> ImportError: No module named twisted.internet
>  > >> [root@tfrc1 ~]#
>  > >>
>  > >> Please suggest what to do.
>  > >>
>  > >> Thanks
>  > >> Sriram

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