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
> > xen-users@xxxxxxxxxxxxxxxxxxx
> >
> > 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
> > xen-users-request@xxxxxxxxxxxxxxxxxxx
> >
> > You can reach the person managing the list at
> > xen-users-owner@xxxxxxxxxxxxxxxxxxx
> >
> > 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 <xen-users@xxxxxxxxxxxxxxxxxx>
> > Subject: Re: [Xen-users] Stable VBD Types
> > To: mail@xxxxxxxxxxxxxxxx
> > Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> > Message-ID: <1119305434.3840.6.camel@xxxxxxxxxxxxxxxxxxxxxxx>
> > Content-Type: text/plain
> >
> > Am Montag, den 20.06.2005, 18:11 +0100 schrieb [GDPR REDACTED]:
> > [...]
> >
> > > 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" <mjh@xxxxxxxx>
> > Subject: [Xen-users] Kernel panic, unable to mount rootfs
> > To: xen-users@xxxxxxxxxxxxxxxxxxx
> > Message-ID: <Pine.LNX.4.62.0506201748260.32722@xxxxxxxxxxxxx>
> > 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" <mjh@xxxxxxxx>
> > Subject: [Xen-users] Re: Kernel panic, unable to mount rootfs
> > To: xen-users@xxxxxxxxxxxxxxxxxxx
> > Message-ID: <Pine.LNX.4.62.0506201811200.32722@xxxxxxxxxxxxx>
> > 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 <yentlsoup@xxxxxxxxx>
> > Subject: Re: [Xen-users] Re: Kernel panic, unable to mount rootfs
> > To: "Matthew J. Harmon" <mjh@xxxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx
> > Message-ID: <cda40682050620172815c07bc6@xxxxxxxxxxxxxx>
> > 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 <mjh@xxxxxxxx> 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
> > > Xen-users@xxxxxxxxxxxxxxxxxxx
> > > 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 <andre.kuester@xxxxxxxxx>
> > Subject: [Xen-users] big sized applications in XEN virtual machine
> > To: xen-users@xxxxxxxxxxxxxxxxxxx
> > Message-ID: <4ee1f99605062019041832dc70@xxxxxxxxxxxxxx>
> > 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" <fajar@xxxxxxxxxxxxx>
> > Subject: Re: [Xen-users] big sized applications in XEN virtual
> > machine To: xen-users@xxxxxxxxxxxxxxxxxxx Message-ID:
>
> <42B78740.20401@xxxxxxxxxxxxx>
>
> > 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 <wim.coekaerts@xxxxxxxxxx>
> > Subject: Re: [Xen-users] big sized applications in XEN virtual
> > machine To: "Fajar A. Nugraha" <fajar@xxxxxxxxxxxxx> Cc: xen-
>
> users@xxxxxxxxxxxxxxxxxxx
>
> > Message-ID: <20050621033602.GA4554@xxxxxxxxxxxxxxxxxxxxxxxx>
> > 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
> > > Xen-users@xxxxxxxxxxxxxxxxxxx
> > > http://lists.xensource.com/xen-users
> >
> > ------------------------------
> >
> > Message: 8
> > Date: Tue, 21 Jun 2005 11:04:13 +0700
> > From: "Fajar A. Nugraha" <fajar@xxxxxxxxxxxxx>
> > Subject: Re: [Xen-users] big sized applications in XEN virtual
> > machine To: xen-users@xxxxxxxxxxxxxxxxxxx Message-ID:
>
> <42B791BD.6010303@xxxxxxxxxxxxx>
>
> > 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 <james@xxxxxxxxxxxxx>
> > Subject: Re: [Xen-users] Xen Install
> > To: sramara@xxxxxxxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx
> > Message-ID: <42B7F054.6020900@xxxxxxxxxxxxx>
> > 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
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > 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
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
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