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1608 discussions

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 02 Nov '08

02 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/

1 0

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

1 0

bonding over bridge or bridge over bonding ?
by Mickaël Canévet 24 Oct '08

24 Oct '08

Hi, I'm trying to configure a network bridge over a bonding without any success. Here is my configuration: ifcfg-eth0: DEVICE=eth0 HWADDR=00:1E:C9:E8:3F:E5 ONBOOT=yes USERCTL=no MASTER=bond0 SLAVE=yes ifcfg-eth1: DEVICE=eth1 HWADDR=00:1E:C9:E8:3F:E7 ONBOOT=yes USERCTL=no MASTER=bond0 SLAVE=yes ifcfg-bond0: DEVICE=bond0 ONBOOT=yes BRIDGE=br0 USERCTL=no ifcfg-bridge0: DEVICE=br0 TYPE=Bridge BOOTPROTO=static IPADDR=192.168.52.55 NETMASK=255.255.255.0 NETWORK=192.168.52.0 BROADCAST=192.168.52.255 ONBOOT=yes DELAY=0 eth0 and eth1 don't goes up... Am I doing something wrong ? Shouldn't I trying to do a bonding over 2 bridges ? Do anybody already tried such a configuration with success ? Thanks -- _______________________________________________________________________ Mickaël Canévet. European Molecular Biology Laboratory (EMBL) Grenoble Outstation. FRANCE _______________________________________________________________________

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Re: [CentOS-virt] pre-built images
by Scott Dowdle 18 Oct '08

18 Oct '08

Greetings, It's me again to mention OpenVZ. I maintain some CentOS OS Templates for OpenVZ and update them on about a monthly basis. I usually don't have trouble having an OS Template out for a new release on the day of the release (example CentOS 4.7 and 5.2). You can find them here: http://download.openvz.org/template/precreated/contrib/ You can actually find a number of OS Templates for CentOS on the openvz.org website but I believe mine (as you can see in the "contrib" directory) are the only ones that are refreshed periodically. As I write this, the current ones are: centos-4-i386-default-4.7-20081013.tar.gz 13-Oct-2008 22:40 108M centos-4-x86_64-default-4.7-20081013.tar.gz 13-Oct-2008 22:43 115M centos-5-i386-default-5.2-20081013.tar.gz 13-Oct-2008 22:47 117M centos-5-x86_64-default-5.2-20081013.tar.gz 13-Oct-2008 22:50 124M Those OS Templates probably have a little more software in them than some of the smaller ones (I like having links, mc, nano, and screen) and yes yum is installed. While I don't have experience with any, it is my understanding that some/many commercial hosting providers that offer "VPS" accounts that are OpenVZ (or Parallels Virtuzzo Containers) based often have somewhat dated, minimalistic setups... often without yum even installed... which can be very problematic. I know the IRC #centos channel on freenode really doesn't like to get questions from cut rate account VPS users running CentOS containers, especially if they are missing some somewhat common packages and don't have an easy way to install them (no yum). Speaking of OpenVZ OS Templates but getting a little off topic with non-CentOS info, an OpenVZ community member (Robert Nelson) has been working on a new OS Template build system he calls "vzpkg2" and "pkg-cacher" (a modified version of Debian's apt-cacher) that makes it easy to build OS Templates for Fedora, CentOS, Debian and Ubuntu... 44 different combinations when you consider the various distro release versions and both the i386 and x86_64 arches. While vzpkg2 is still hasn't been added as a stock OpenVZ package, I've been testing it and it works great. It is easy to build YOUR OWN OS Templates from scratch and in a network efficient way (with the help of pkg-cacher). I was able to build all 44 OS Templates in just a couple of hours with a broadband connection. What's an OS Template? Basically it is install media for a Linux distribution from which you can make a container in about a minute. I did an interview with Robert Nelson and wrote up a more complete explanation on OS Templates which you can find here: http://www.montanalinux.org/robert-nelson-interview.html I really recommend using CentOS as an OpenVZ host node distro. Why? You can find out in the OpenVZ HOWTO I wrote for the CentOS wiki here: http://wiki.centos.org/HowTos/Virtualization/OpenVZ Questions, comments, suggestions? Feel free to email me directly (dowdle(a)montanalinux.org) or this list. TYL, -- Scott Dowdle 704 Church Street Belgrade, MT 59714 (406)388-0827 [home] (406)994-3931 [work]

1 0

pre-built images
by Karanbir Singh 18 Oct '08

18 Oct '08

Tru has already been building vmware images ( http://people.centos.org/tru/vmware/ ) for various roles. I was wondering if there was any interest in prebuilt Xen images as well ? And if so, what would be the roles people would want images done for, and what might be suiteable package sets to include for those roles. -- Karanbir Singh : http://www.karan.org/ : 2522219@icq

3 2

init 6 works inconsistently in XEN
by Brett Serkez 16 Oct '08

16 Oct '08

I am using Centos 5.2 as both my XEN host and guests. Both the XEN host and each XEN guest are up-to-date with the latest CentOS 5.2 updates. I've noticed over time that sometimes using init 6 (or init 0) in the guest works flawlessly and other times the guest will reach "Restarting System"/"System Halted" and hang. When this hang occurs the only way to finish the shutdown/reboot is to destroy the virtual machine and also one of the CPUs on the XEN host is maxed out at 100% CPU. Trying to diagnose this hang, I have found that restarting the xend and xendomains daemons restores the ability to init 6/init 0 the guests. I have not as yet narrowed the problem further. I was wondering if anyone else has seen this behavior and if so if there is a known fix, if not, how to properly report this issue so it can eventually be addressed? Brett

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