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can I setup KVM on latest Centos 5.2 and where can I find the guide??
by rolandsun sun 29 Jun '08

29 Jun '08

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gnome desktop XDMCP in domU
by David Hláčik 28 Jun '08

28 Jun '08

Hello, i have CentOS on xen as domU, i have installed "yum groupinstall Gnome Desktop ... " . I want to access Gnome Desktoup through XDMCP protocol, but unfortunately X server will not start when there is no graphical output where to start. How can i solve this problem? And of course i have edited gdm.conf and added to [XDMCP] Enable = True. Thanks in advance! David

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updating to 5.2 with Xen 3.2 installed
by Kai Schaetzl 26 Jun '08

26 Jun '08

Has someone already upgraded a machine with the Xen 3.2 packages from http://www.xen.org/download/dl_32rhel5.html to CentOS 5.2? Problems? Kai -- Kai Schätzl, Berlin, Germany Get your web at Conactive Internet Services: http://www.conactive.com

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kvm under centos5.1/5.2
by carlopmart 20 Jun '08

20 Jun '08

Hi all, Somebody have tried kvm under centos 5/5.1/5.2?? How stable and usable is it?? Any tip?? After redhat news about support kvm in the future I think that software will be more releveant in virtulized environments. Thanks. -- CL Martinez carlopmart {at} gmail {d0t} com

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Migration from Windows VMs from VMWare server to Xen
by Stephen 05 Jun '08

05 Jun '08

Hi everyone, Does anyone know how to migrate virtual machines from VMWare server to Centos Xen VMs? If someone has some hints or a helpful blog they know of, that would be great. Thank you Stephen

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unable to access xen guest's console
by a s p a s i a 05 Jun '08

05 Jun '08

Hello all, I am new to Xen; I followed a few techtips/technotes from How2forge and other linux sites to walk me through configuring the following: - proper installation of xen kernel on a CentOS 5.1 server - booting into the xen kernel and checking the Dom0 (all is fine): [root@dataserv3 /]# xm list Name ID Mem(MiB) VCPUs State Time(s) Domain-0 0 1737 2 r----- 1155.0 - Next instructions that attempt to walk me through installing my first guest OS via "virt-install" and/or "virtual manager" - both allowed me to get to the point of where the guest DomU is created ... and it's at 12%; the CLI install process tells me to access the console - but I am unable to console into the new guest DomU. xm list now shows: -------------------- xm list Name ID Mem(MiB) VCPUs State Time(s) Domain-0 0 1737 2 r----- 1155.0 centos50 2 255 1 ------ 0.0 xm console centos50 gives me an error: xm console centos50 xenconsole: Could not read tty from store: No such file or directory While running the Virtual Machine Mgr GUI - when I click on my guest DomU - its console window appears gray with a message "The console is currently unavailable". Questions: 1. Is there a link or some paper that I may have missed that outlines potential issues in configuring Xen guest machines using virt-install and/or Virtual Machine Mgr? 2. Any thoughts as to what steps or packages did I miss so that I am not getting a console? thanks in advance. - aspasia. -- A S P A S I A . . . . . . . . . . ..

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Add new drive to Windows domu
by Stephen 04 Jun '08

04 Jun '08

Hi everyone, I'm wondering how one adds a new drive to a Windows domu... I'm running Centos 5.1 x86_64 on a Xeon server and have a Windows 2003 R2 64 bit domu. The Windows system was installed from a CD onto this server so it is a brand new VM. All working fine. So then I wish to add another drive to the Windows domu for a data drive. I added the drive to the Xen configuration, but it doesn't turn up in Windows. When I reboot and go into the Windows server control panel/system/hardware, there is still only one drive there, a QEMU drive. Here is the configuration I have... [root@svr5 xen]# cat win2k3svr64 name = "win2k3svr64" uuid = "70e520e8e3e5931b92ce46d83ba9557d" maxmem = 500 memory = 500 vcpus = 1 builder = "hvm" kernel = "/usr/lib/xen/boot/hvmloader" boot = "c" pae = 1 acpi = 1 apic = 1 on_poweroff = "destroy" on_reboot = "restart" on_crash = "restart" device_model = "/usr/lib64/xen/bin/qemu-dm" sdl = 0 vnc = 1 vncunused = 0 keymap = "en-us" vncdisplay = "0" disk = [ 'phy:/dev/vgdata4vm/lvw2k3docsvr,hda,w', 'phy:/dev/vgdata4vm/lvwin2k3homes,hdc,w' ] vif = [ "mac=00:16:3e:18:c9:42,bridge=xenbr0,type=ioemu,script=vif-bridge" ] serial = "pty" Thank you Stephen

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Virtuozzo & GFS
by James Thompson 01 Jun '08

01 Jun '08

I have just finished deploying two Dell PowerEdge 1950s with CentOS 5.1 and Virtuozzo 4. GFS is up and running and Virtuozzo is configured for shared-storage clustering. Everything works adequately but I am wondering if anyone else has experienced load issues like I am seeing. I have three VEs/VMs running, two on one node and one on the other node. One of the VEs on each node are doing very little (one is just idling with apache and mysql and the other is running rsync every six hours). The other is running Zimbra. Every so often load will spike on the node running the Zimbra VE to as high as 2 or 3 then settle down a short while later to around 0.8 or 0.9. During the spikes the node not running Zimbra will other see an increase from its idle load of 0.4 or so up to as high as 1.7 as I have seen. I notice when running top that dlm_send and dlm_recv will jump to the top fairly frequently when these load spikes occur. What I am wondering is whether anyone else has experienced these kind of load scenarios with GFS and what they have done to deal with them? We are hoping to deploy a bit more densely on this setup so I'd like to make any performance adjustments I can at this stage. Thanks, James Thompson

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my domU from jailtime.org using latests xen kernel freezees
by David Hláčik 26 May '08

26 May '08

Hello, i will describe my approach 1) I have downloaded Centos5-64bit xen image from jailtime.org 2) I have created own swap image with 512MB file size 3) I have used same as dom0 kernel 2.6.18-53.1.19.el5xen 4) I have mounted my image file and copied /lib/modules/2.6.18-53.1.19.el5xen 5) I have created custom ramdisk for domU with mkinitrd --with=xennet --preload=xenblk /boot/initrd-2.6.18-53.1.19.el5xen.domU.img `uname -r` (uname -r = 2.6.18-53.1.19.el5xen) 6) Here comes my config file : kernel = "/boot/vmlinuz-2.6.18-53.1.19.el5xen" ramdisk = "/boot/initrd-2.6.18-53.1.19.el5xen.domU.img" memory = 512 name = "webdev" vcpus = 2 vif = [ '' ] disk = [ 'tap:aio:/home/xen/webdev/webdev_root.img,sda1,w', 'tap:aio:/home/xen/webdev/webdev_swap.img,sda2,w' ] root = "/dev/sda1 ro" 7) when i will run domU machine using xm create webdev_config.xen -c , it will start booting but it will got freeze , exactly at step after starting crond Using config file "./webdev_config.xen". Started domain webdev_labs_polarion_com PCI: System does not support PCI PCI: System does not support PCI NetLabel: Initializing NetLabel: domain hash size = 128 NetLabel: protocols = UNLABELED CIPSOv4 NetLabel: unlabeled traffic allowed by default NET: Registered protocol family 2 IP route cache hash table entries: 32768 (order: 6, 262144 bytes) TCP established hash table entries: 131072 (order: 9, 2097152 bytes) TCP bind hash table entries: 65536 (order: 8, 1048576 bytes) TCP: Hash tables configured (established 131072 bind 65536) TCP reno registered audit: initializing netlink socket (disabled) audit(1211455944.113:1): initialized VFS: Disk quotas dquot_6.5.1 Dquot-cache hash table entries: 512 (order 0, 4096 bytes) Initializing Cryptographic API ksign: Installing public key data Loading keyring - Added public key 496E59E526CA1803 - User ID: CentOS (Kernel Module GPG key) io scheduler noop registered io scheduler anticipatory registered io scheduler deadline registered io scheduler cfq registered (default) pci_hotplug: PCI Hot Plug PCI Core version: 0.5 rtc: IRQ 8 is not free. Non-volatile memory driver v1.2 Linux agpgart interface v0.101 (c) Dave Jones RAMDISK driver initialized: 16 RAM disks of 16384K size 4096 blocksize Xen virtual console successfully installed as xvc0 Bootdata ok (command line is root=/dev/sda1 ro ) Linux version 2.6.18-53.1.19.el5xen (mockbuild(a)builder10.centos.org) (gcc version 4.1.2 20070626 (Red Hat 4.1.2-14)) #1 SMP Wed May 7 08:51:05 EDT 2008 BIOS-provided physical RAM map: Xen: 0000000000000000 - 0000000020800000 (usable) No mptable found. Built 1 zonelists. Total pages: 133120 Kernel command line: root=/dev/sda1 ro Initializing CPU#0 PID hash table entries: 4096 (order: 12, 32768 bytes) Xen reported: 2387.998 MHz processor. Console: colour dummy device 80x25 Dentry cache hash table entries: 131072 (order: 8, 1048576 bytes) Inode-cache hash table entries: 65536 (order: 7, 524288 bytes) Software IO TLB disabled Memory: 499712k/532480k available (2358k kernel code, 23900k reserved, 1325k data, 172k init) Calibrating delay using timer specific routine.. 5973.11 BogoMIPS (lpj=11946225) Security Framework v1.0.0 initialized SELinux: Initializing. selinux_register_security: Registering secondary module capability Capability LSM initialized as secondary Mount-cache hash table entries: 256 CPU: L1 I cache: 32K, L1 D cache: 32K CPU: L2 cache: 4096K CPU: Physical Processor ID: 0 CPU: Processor Core ID: 2 (SMP-)alternatives turned off Brought up 1 CPUs checking if image is initramfs... it is Grant table initialized NET: Registered protocol family 16 ACPI Exception (utmutex-0262): AE_BAD_PARAMETER, Thread 377A0 could not acquire Mutex [2] [20060707] ACPI Exception (utmutex-0262): AE_BAD_PARAMETER, Thread 377A0 could not acquire Mutex [2] [20060707] Initializing CPU#1 migration_cost=2742 Brought up 2 CPUs PCI: setting up Xen PCI frontend stub ACPI: Interpreter disabled. Linux Plug and Play Support v0.97 (c) Adam Belay pnp: PnP ACPI: disabled xen_mem: Initialising balloon driver. usbcore: registered new driver usbfs usbcore: registered new driver hub PCI: System does not support PCI PCI: System does not support PCI NetLabel: Initializing NetLabel: domain hash size = 128 NetLabel: protocols = UNLABELED CIPSOv4 NetLabel: unlabeled traffic allowed by default NET: Registered protocol family 2 IP route cache hash table entries: 32768 (order: 6, 262144 bytes) TCP established hash table entries: 131072 (order: 9, 2097152 bytes) TCP bind hash table entries: 65536 (order: 8, 1048576 bytes) TCP: Hash tables configured (established 131072 bind 65536) TCP reno registered audit: initializing netlink socket (disabled) audit(1211455944.113:1): initialized VFS: Disk quotas dquot_6.5.1 Dquot-cache hash table entries: 512 (order 0, 4096 bytes) Initializing Cryptographic API ksign: Installing public key data Loading keyring - Added public key 496E59E526CA1803 - User ID: CentOS (Kernel Module GPG key) io scheduler noop registered io scheduler anticipatory registered io scheduler deadline registered io scheduler cfq registered (default) pci_hotplug: PCI Hot Plug PCI Core version: 0.5 rtc: IRQ 8 is not free. Non-volatile memory driver v1.2 Linux agpgart interface v0.101 (c) Dave Jones RAMDISK driver initialized: 16 RAM disks of 16384K size 4096 blocksize Xen virtual console successfully installed as xvc0 Event-channel device installed. Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2 ide: Assuming 50MHz system bus speed for PIO modes; override with idebus=xx ide-floppy driver 0.99.newide usbcore: registered new driver hiddev usbcore: registered new driver usbhid drivers/usb/input/hid-core.c: v2.6:USB HID core driver PNP: No PS/2 controller found. Probing ports directly. i8042.c: No controller found. mice: PS/2 mouse device common for all mice md: md driver 0.90.3 MAX_MD_DEVS=256, MD_SB_DISKS=27 md: bitmap version 4.39 TCP bic registered Initializing IPsec netlink socket NET: Registered protocol family 1 NET: Registered protocol family 17 XENBUS: Device with no driver: device/vbd/2049 XENBUS: Device with no driver: device/vbd/2050 XENBUS: Device with no driver: device/vif/0 XENBUS: Device with no driver: device/console/0 Write protecting the kernel read-only data: 445k Red Hat nash version 5.1.19.6 starting Mounting proc filesystem Mounting sysfs filesystem Creating /dev Creating initial device nodes Setting up hotplug. Creating block device nodes. Loading xenblk.ko module Registering block device major 8 Loading uhci-hcd.ko module USB Universal Host Controller Interface driver v3.0 Loading ohci-hcd.ko module Loading ehci-hcd.ko module Loading jbd.ko module Loading ext3.ko module Loading raid1.ko module md: raid1 personality registered for level 1 Loading scsi_mod.ko module SCSI subsystem initialized Loading sd_mod.ko module register_blkdev: cannot get major 8 for sd Loading libata.ko module Loading ata_piix.ko module Loading pata_marvell.ko module Loading dm-mod.ko module device-mapper: ioctl: 4.11.0-ioctl (2006-09-14) initialised: dm-devel(a)redhat.com Loading dm-mirror.ko module Loading dm-zero.ko module Loading dm-snapshot.ko module Loading xennet.ko module netfront: Initialising virtual ethernet driver. netfront: device eth0 has flipping receive path. Waiting for driver initialization. Scanning and configuring dmraid supported devices md: Autodetecting RAID arrays. md: autorun ... md: ... autorun DONE. Scanning logical volumes Reading all physical volumes. This may take a while... No volume groups found Activating logical volumes Volume group "VolGroup00" not found Creating root device. Mounting root filesystem. EXT3-fs: INFO: recovery required on readonly filesystem. EXT3-fs: write access will be enabled during recovery. kjournald starting. Commit interval 5 seconds EXT3-fs: recovery complete. EXT3-fs: mounted filesystem with ordered data mode. Setting up other filesystems. Setting up new root fs no fstab.sys, mounting internal defaults Switching to new root and running init. unmounting old /dev unmounting old /proc unmounting old /sys INIT: version 2.86 booting Welcome to CentOS release 5 (Final) Press 'I' to enter interactive startup. Setting clock : Thu May 22 07:32:31 EDT 2008 [ OK ] Starting udev: [ OK ] Setting hostname localhost.localdomain: [ OK ] DM multipath kernel driver not loaded No devices found Setting up Logical Volume Management: No volume groups found [ OK ] Checking filesystems Checking all file systems. [/sbin/fsck.ext3 (1) -- /] fsck.ext3 -a /dev/sda1 /dev/sda1: clean, 19482/128256 files, 110482/256256 blocks [ OK ] Remounting root filesystem in read-write mode: [ OK ] Mounting local filesystems: [ OK ] Enabling /etc/fstab swaps: [ OK ] INIT: Entering runlevel: 3 Entering non-interactive startup Bringing up loopback interface: [ OK ] Bringing up interface eth0: Determining IP information for eth0... failed. [FAILED] Starting system logger: [ OK ] Starting kernel logger: [ OK ] Starting sshd: [ OK ] Starting crond: [ OK ] Thanks for help!

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About dom0 and guest machine
by Waldirio Manhães Pinheiro 21 May '08

21 May '08

Hello Friends, good afternoon I'd like to ask about stored settings of dom0 and guests machine. For example, I've a SunFire x4600 with 32GB/Ram and 16 CPU's (8 CPU's dual core). When I power on my system, with the command #xm vcpu-list, I can see this [root@srv ~]# xm vcpu-list Name ID VCPUs CPU State Time(s) CPU Affinity Domain-0 0 0 0 -b- 23.1 any cpu Domain-0 0 1 7 -b- 12.7 any cpu Domain-0 0 2 10 r-- 15.2 any cpu Domain-0 0 3 9 -b- 10.8 any cpu Domain-0 0 4 2 -b- 11.4 any cpu Domain-0 0 5 8 -b- 10.6 any cpu Domain-0 0 6 12 -b- 10.6 any cpu Domain-0 0 7 4 -b- 10.5 any cpu Domain-0 0 8 5 -b- 9.7 any cpu Domain-0 0 9 0 -b- 8.9 any cpu Domain-0 0 10 14 -b- 8.8 any cpu Domain-0 0 11 15 -b- 8.6 any cpu Domain-0 0 12 13 -b- 8.9 any cpu Domain-0 0 13 0 -b- 8.9 any cpu Domain-0 0 14 11 -b- 10.4 any cpu Domain-0 0 15 3 -b- 12.3 any cpu Ok, but if I enter with this command (#xm vcpu-set 0 5) and restart the machine, my system return with 5 actives CPU's PS: My /etc/xen/xend-config.sxp is configured like above (referent a CPU to dom0): (dom0-cpus 0) So, this is my first doubt. What do you recommend like a good configuration, keep to (dom0-cpus 0) or force the max CPU to cpu0, in my case (dom0-cpus 16) ? My second doubt is about the guest machine, when I make a config file, I can set the vcpus flag, where I can set the MAX CPU number (I believe), so, Imagine, I'd like to create a guest machine with 4 CPU's, but, maybe, I need increase this value. How do you recommend the configuration of vcpus field in guest machine config file ?!, with the max CPU possible or there are another configuration for this. So, Thank you in advanced. Best Regards -- ______________ Atenciosamente Waldirio msn: wmp(a)sinope.com.br Site: www.waldirio.com.br Blog: blog.waldirio.com.br PGP: www.waldirio.com.br/public.html

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