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Need Help with Xen Please
by Jason Taylor 28 Nov '08

28 Nov '08

Hello: I am new to Xen and have been having problems getting it to run properly on CentOS 5.2. One thing to note is that the base Xen installs fine it seems but when trying to create the virtual instance (domU) it says it cannot connect to the console. I have looked up the error but cannot find anything specific to try. I currently only have access to the server remotely via SSH, if this matters at all. qemu: the number of cpus is 1 *** image /local/domain/0/backend/vbd/5/768 format raw driver 0x80e7940 *** image /local/domain/0/backend/vbd/5/5632 format raw driver 0x80e7940 Watching /local/domain/5/logdirty/next-active Could not initialize SDL - exiting I would really appreciate any assistance from anyone who knows Xen and CentOS. Thanks Jason

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Re: [CentOS-virt] Running Fedora 10 (and rawhide) Xen guests/domUs on CentOS 5 dom0
by Scott Dowdle 27 Nov '08

27 Nov '08

Pasi, ----- "Pasi Kärkkäinen" <pasik(a)iki.fi> wrote: > Now when Fedora 10 is out, I thought of writing here what's needed to > run Fedora 10 Xen domUs on CentOS 5 dom0. Just wanted to mention that I built OpenVZ OS Templates for Fedora 10 i386/x86_64 default/minimal and posted them on the OpenVZ site in the contrib directory to coincide with the Fedora 10 release. They can be found here: http://download.openvz.org/template/precreated/contrib/ fedora-10-i386-default.tar.gz 23-Nov-2008 20:20 171M fedora-10-i386-minimal.tar.gz 23-Nov-2008 23:30 83M fedora-10-x86_64-default.tar.gz 23-Nov-2008 22:50 202M fedora-10-x86_64-minimal.tar.gz 23-Nov-2008 23:32 84M No special instructions needed... just create a container as usual. TYL, -- Scott Dowdle 704 Church Street Belgrade, MT 59714 (406)388-0827 [home] (406)994-3931 [work]

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Vista will install but not load in virt-manager
by Larry Patterson 26 Nov '08

26 Nov '08

Hi All I have successfully installed vista ultimate as a virtual image using the CentOS 5.2 virt-manager. It appears to completely install but as soon as I log in for the first time it reboots and then can not file it's boot image file. It appears to find the mbr but then stop, this is what is on the screen when it stops (the /etc/xen config file is given below) Booting 'Windows Vista' acpi Vista Loader 2.1.1 ACPI: Reclaim Memory not found! Done! fallback 1 find --set-root /bootmgr (hd0,0) Filesystem type is ntfs, partition type 0x7 chainloader /bootmgr Will boot NTLDR from drive-0x80, partiotn=0x0(hidden sectors=0x800) /etc/xen config file 'vista2' name = "vista2" uuid = "1ae9835e-4cb5-8785-e951-683a88cb5492" maxmem = 1506 memory = 512 vcpus = 2 builder = "hvm" kernel = "/usr/lib/xen/boot/hvmloader" boot = "c" pae = 1 acpi = 1 apic = 1 localtime = 1 on_poweroff = "destroy" on_reboot = "restart" on_crash = "restart" device_model = "/usr/lib64/xen/bin/qemu-dm" usbdevice = "tablet" sdl = 0 vnc = 1 vncunused = 1 keymap = "en-us" disk = [ "file:/var/lib/xen/images/vista2.img,hda,w", "file:/install/vista.iso,hdc:cdrom,r" ] vif = [ "mac=00:16:3e:5b:de:f1,bridge=virbr0" ] serial = "pty" Any help is much appreciated Thanks

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Re: [CentOS] Stop the FUD Xen is not deprecated
by Brett Serkez 25 Nov '08

25 Nov '08

On Tue, Nov 25, 2008 at 10:45 AM, Vandaman <vandaman2002-sk(a)yahoo.co.uk> wrote: > Do people have wet underwear for nothing over XEN? > > See http://www.redhat.com/promo/qumranet/ > > As far as CentOS is concerned saying Xen is deprecated is > jumping the gun. CentOS ships with Xen and as long as upstream > supports it, CentOS by extension supports it. Thank you for the clarification. What isn't clear from reading the above referenced material is if Xen will be included in future CentOS releases. Brett

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maintenance of kvm and qemu in extras
by Michael Schenck 24 Nov '08

24 Nov '08

I see that kvm has been updated since Sept. 08 2007, and qemu hasn't since Sept. 12 2007. I understand that redhat is migrating from xen to kvm, I'm curious if that has provoked this reduced maintenance or if interest was just lost. If this is of interest to others, Qemu 0.9.1 does provide a lot more features lacking in 0.9.0 that I would like to use, including virtio and e1000 NIC models, which provide better performance, as well as netbooting virtuals. I'm curious to hear everyones thoughts on this. Best Regards, Michael Schenck

4 13

kvm-69
by Karanbir Singh 07 Nov '08

07 Nov '08

hi guys, I came across Gerd Hoffmann's repo at http://kraxel.fedorapeople.org/el5/ which seems to have a much newer KVM for EL5 - has anyone managed to get that working ? Even trying with the kver he used ( 2.6.18-53.el5 ) does not seem to satisfy all required symbols. - KB

4 7

xen domains autostart
by David Hláčik 03 Nov '08

03 Nov '08

Hi guys, I have Centos 5.2 with all updates. I am using xen virtualization - with visrsh. I want to have autostart of domains configured, but so far this does not work [root@power ~]# virsh autostart reqdemo libvir: error : this function is not supported by the hypervisor: virDomainSetAutostart error: Failed to mark domain reqdemo as autostarted I know that , when i am using xm style config, i am able to create symlink in /etc/xen/auto ... but those are virsh config files. Thanks in advance! David

2 1

Can't get PCI card visible in guest
by Kenneth Tanzer 01 Nov '08

01 Nov '08

I've got a Digium PCI telephone card that I'm trying to use with an AsteriskNow guest, on a CentOS 5.2 host. I've tried setting up the pciback stuff, and think I've done it right, but the card does not show up in the guest. I'm obviously missing something, so any help (including ways to debug this!) would be greatly appreciated. Here's some more info: The guest is fully virtualized, so I'm assuming that nothing should need to be configured within the guest. On the host, the card shows up as: [root@xenhost bus]# lspci | grep Digium 07:01.0 Ethernet controller: Digium, Inc. Unknown device 8005 (rev 11) I think the pciback is set up properly. When I load the module, the /sys/bus/pci/drivers/pciback/ is created, and everything looks the way I think it should: [root@xenhost pciback]# pwd ; cat slots ; file 0000\:07\:01.0 /sys/bus/pci/drivers/pciback 0000:07:01.0 0000:07:01.0: symbolic link to `../../../../devices/pci0000:00/0000:00:02.0/0000:01:00.3/0000:07:01.0' This shows up in /var/log/messages: Oct 24 16:34:58 xenhost kernel: pciback 0000:07:01.0: seizing device Oct 24 16:34:58 xenhost kernel: PCI: Enabling device 0000:07:01.0 (0000 -> 0003) Oct 24 16:34:58 xenhost kernel: ACPI: PCI Interrupt 0000:07:01.0[A] -> GSI 24 (level, low) -> IRQ 20 Oct 24 16:34:58 xenhost kernel: ACPI: PCI interrupt for device 0000:07:01.0 disabled Here is my xen config file, with the PCI line at the end: name = "asterisk_now" uuid = "02f476ce-7a98-e58c-f715-0bb28a3c6c3d" maxmem = 2048 memory = 1024 vcpus = 1 builder = "hvm" kernel = "/usr/lib/xen/boot/hvmloader" boot = "c" pae = 1 acpi = 1 apic = 1 localtime = 0 on_poweroff = "destroy" on_reboot = "restart" on_crash = "restart" device_model = "/usr/lib/xen/bin/qemu-dm" sdl = 0 vnc = 1 vncunused = 1 keymap = "en-us" disk = [ "phy:/dev/datafarm/asterisk_now,hda,w", ",hdc:cdrom,r" ] vif = [ "mac=00:16:3e:6c:ae:c2,bridge=xenbr0" ] serial = "pty" pci = [ "07:01.00" ] (In the scattered bits of documentation I've found on this topic, I've seen a couple of different formats for specifying the PCI, including "pci = [ "0000:07:01.00" ] and "7,1,0". None of them seemed to work either. My virtual AsteriskNow machine is not yet running (and I've tried restarting xend at this point), but when I start the machine, no card is visible: [admin@192-168-6-94 ~]$ lspci 00:00.0 Host bridge: Intel Corporation 440FX - 82441FX PMC [Natoma] (rev 02) 00:01.0 ISA bridge: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II] 00:01.1 IDE interface: Intel Corporation 82371SB PIIX3 IDE [Natoma/Triton II] 00:01.2 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ACPI (rev 01) 00:01.3 USB Controller: Intel Corporation 82371SB PIIX3 USB [Natoma/Triton II] (rev 01) 00:02.0 VGA compatible controller: Cirrus Logic GD 5446 00:03.0 Class ff80: XenSource, Inc. Xen Platform Device (rev 01) 00:04.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 20) Thanks in advance for any assistance! Ken

8 21

Very high cpu waiting on xen domU
by Frederic SOULIER 31 Oct '08

31 Oct '08

Hi, I have some xen domU on Centos 5.2 server. For some weeks i had a problem with "xen domU" performances. Indeed my xen domU spend a lot of time in cpu waiting. Reading some informations on the net it seems to come ith I/O heavy load. Using collectd in my domU to monitor the "traffic" on virtual disk and virtuel network i don't see heavy I/O rates. Thinking my dom0 was overloaded by my domUs i have stopped all my domUs except one but the problem persist. I don't know how to get more informations in order to solve my problem. For information our config is : - Hitachi SAN infrastructure - DELL 1950 servers with 2 qlogic hba adapters (we used qla2xx drivers and linux dm-multipath for multipathing ) - We have 1 LUN on the SAN for each domU - The dom0 manage theses LUNs using LVM - A domU xen disk configuration looks like this : disk = [ 'phy:/dev/VolGroupIdp/LogVolIdp-disk,xvda1,w'] - In the domU we doesn't use LVM. - At the network level we share a gigabit interface with all the domU using linux bridges. Each bridge refer to a different vlan. Anyone encoutered I/O performances problems with latests centos 5.2 xen releases ? (In fact i don't really understand if it's a xen problem or a "hardware" problem) Regards -- Frederic Soulier Administrateur Reseau Centre de Ressources Informatiques Université Toulouse 1 Sciences Sociales 2 RUE DU DOYEN GABRIEL MARTY 31042 TOULOUSE CEDEX 9 Tel : +33 5 61 63 39 98 / +33 5 61 63 39 98 Fax : +33 5 61 63 37 98 Bureau : AR38 bis http://cri.univ-tlse1.fr/

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Proxmox VE 1.0 released today
by Scott Dowdle 29 Oct '08

29 Oct '08

Greetings, Since everyone on this list is interested in Linux and virtualization... I just wanted to mention that the Proxmox VE folks just released Proxmox VE 1.0 today. Proxmox VE site: http://pve.proxmox.com/wiki/Main_Page Proxmox VE 1.0 Announcement: http://www.proxmox.com/forum/showthread.php?t=750 I've mentioned it on this list before wondering if anyone was interested in borrowing some of the software from their project (since it is GPLed) and applying it to CentOS. What is Proxmox VE? It is a "bare-metal" Linux distribution based on Debian 4.0r5 that includes a 2.6.24-based kernel that includes support for both KVM (Machine / Hardware Virtualization) and OpenVZ (OS Virtualization). Proxmox VE includes a really nice, web-based management system that allows for: 1) KVM virtual machine or OpenVZ container creation 2) Live and offline VM / Container migration from one physical host to another, shared storage solution not required 3) VM Image / OS Template management 4) VM / Container monitoring Possibilities for CentOS: a) Create "bare-metal" install media for a system based on CentOS b) Separate out the web-management application into separate software packages that could be installed on existing CentOS systems c) Separate KVM and OpenVZ so you could run an only-KVM server or an only-OpenVZ server. This would be very handy on hardware that does not support VT in the CPU. If virtualization interests you, give Proxmox VE a try and see what you think. Feel free to email me directly with comments. TYL, -- Scott Dowdle 704 Church Street Belgrade, MT 59714 (406)388-0827 [home] (406)994-3931 [work] dowdle(a)montanalinux.org

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