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1612 discussions

Can KVM be run "headless"?
by MargoAndTodd 11 Nov '10

11 Nov '10

Hi All, Can KVM be run "Headless", like Virtual Box? If so, how do I open a window to it? How do I start and stop it? Many thanks, -T

3 7

KVM: where are the directions?
by MargoAndTodd 11 Nov '10

11 Nov '10

Hi All, I have been Googling my rear off. Where is the manual for KVM? It seems like the information is just all thrown about. Anyone know of a manual? A pdf? A home page with instructions? I am teachable (mostly). Many thanks, -T

1 2

Need sub for virtual box
by MargoAndTodd 11 Nov '10

11 Nov '10

Hi All, I am running Virtual box on a CentOS 5.5 x64 bit host. The guest is 23 bit Windows Server 2008 SP2 (not R2). Virtual Box bug 7606 is causing a customer of mine serious financial harm. http://www.virtualbox.org/ticket/7607#comment:3 I have tried in vain month or month over month to get Oracle to sell me a tech support contract, so that we can get some priority on this issue. No joy. I just get psycho babbled all over about "Reaching out to me". I have had it. Is there a good replacement for Virtual Box? requirements: 1) must run on CentOS 5.x as the host 2) must support Windows Server 2008 32 bit sp2 (not R2) as a guest 3) must support Supermicro X8SAX motherboard 4) must support the Intel x5650 processor (6 cores) 5) must actually work! Many thanks, -T

1 1

Which is the best network interface to use.
by Rich 08 Nov '10

08 Nov '10

I am running centos 5.5 virtualized environment. I have 2 bridged network cards. My question is this. Should I be using virtual network or the shared physical device architecture?

2 1

vrit ip config
by ops Power Fag 07 Nov '10

07 Nov '10

cat /etc/sysconfig/network-scripts/ifcfg-eth0* # nVidia Corporation MCP61 Ethernet DEVICE=eth0 BOOTPROTO=static HWADDR=6C:F0:49:93:11:A3 IPADDR=192.168.182.237 NETMASK=255.255.255.0 ONBOOT=yes # nVidia Corporation MCP61 Ethernet DEVICE=eth0:1 BOOTPROTO=static IPADDR=192.168.182.238 NETMASK=255.255.255.0 ONBOOT=yes when reboot, ping show network down network up xend start network down how to fix this? datacenter charge me each time I need fix.

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dom0 network alias
by ops Power Fag 07 Nov '10

07 Nov '10

hi, I try to start xend on a server with network aliases and the network stack goes down. how to fix please? uses aliases on dom0 eth0 device amyone? <@tru_tru> opsPowerFag: try the centos-virt mailing list?

1 0

Is kvm-clock dependant on hardware of Physical Server?
by Steven Ellis 04 Nov '10

04 Nov '10

I've got a three Centos 5.5 KVM severs, but only one of them is presenting guests with the kvm-clock source. The two servers I'm not seeing kvm-clock on have Athlon x2 64bit processors. The other server with kvm-clock has a Phenom II X6 1090T Processor. I've checked the system configuration and all the boxes have the same set of RPM packages. To confirm that the issue was physical hardware specific I migrated a VM from the Athlon to the Phenom server and the kvm-clock source appeared. Any ideas why I'm not seeing kvm-clock with my Athlon X2 processors, or is there another difference I haven't caught? Steve

1 1

Conversion steps from Vmware server 2 to Centos KVM 5.5
by Tom Bishop 01 Nov '10

01 Nov '10

So I have finally carved out some time and need to start converting my vm's from Vmware server to KVM and I was wondering if anyone had the specfic steps that need to be taken...I understand how to convert the disks etc..what I am interested in is how to get them to use virtio ones which means iw ill need to remake initrd...so if anyone has moved from vmware server (aka the free one) to KVM and using the virtio drivers...if you have the complete steps that would be great...Thanks...**

1 0

Xen on Centos 5.5 vs 5.3 and stability issues
by Steven Ellis 01 Nov '10

01 Nov '10

I've recently upgraded a Centos 5.3 machine to Centos 5.5. The hardware isn't HVM capabile so I'm only running para-virt guests. Using a vanilla i386 kernel boots without, but the newer kernel-xen locks up the Dom0 after a couple of minute. I'm only booting into single user mode for these tests so no VMs are active. *kernel-xen-2.6.18-128.1.10.el5 - no issues *kernel-xen-2.6.18-194.17.4.el5 - lock up *kernel-2.6.18-194.17.4.el5 - no issues For the moment I've switched back to the older Xen kernel, athough I'm still running the newer Xen Hypervisor. My current Xen packages are *xen-3.0.3-105.el5_5.5 *kernel-xen-2.6.18-194.17.4.el5 *kernel-xen-2.6.18-128.1.10.el5 *kmod-xfs-xen-0.4-2 *xen-libs-3.0.3-105.el5_5.5 *kernel-xen-devel-2.6.18-194.17.4.el5 *kernel-xen-devel-2.6.18-128.1.10.el5 *xen-devel-3.0.3-105.el5_5.5 Prior to the upgrade I had the following installed under Centos 5.3 *kernel-xen-devel-2.6.18-128.1.6.el5 *kernel-xen-2.6.18-128.1.10.el5 *xen-libs-3.0.3-80.el5_3.2 *xen-devel-3.0.3-80.el5_3.2 *kmod-xfs-xen-0.4-2 *kernel-xen-2.6.18-128.1.6.el5 *kernel-xen-devel-2.6.18-128.1.10.el5 *xen-3.0.3-80.el5_3.2 Booting Dom0 with kernel-xen-2.6.18-128.1.10.el5 everything appears to work normally and all of my Guests are up and running. If I boot with kernel-xen-2.6.18-194.17.4.el5 the boot normally gets to around udev and the system locks up. On a couple of occasions it did mange to boot but reported some files were corrupted. I'm worried that there is an issue running this kernel where the root file system is LVM on top of Raid 1. Anyone on this list have tips on diagnosing the issue, or come across a similar problem themselves. Steve

4 6

Best way to give guest promiscuous interface?
by David Knierim 29 Oct '10

29 Oct '10

I am using CentOS 5.5 with KVM as a host and have a need for one guest to be able to have promiscuous read access to one port on the physical host (which is an HP BL460 G6 blade server with Intel 2 port 1Gb ethernet mezzanine card.) I initially tried to use PCI passthrough, but I was unable to get it to work. I set everything up as documented in RHEL documentation (http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/Virtualiz…, but I got the following error message: # virsh start c7e1b6_g1 error: Failed to start domain c7e1b6_g1 error: this function is not supported by the hypervisor: Device 0000:0b:00.0 is behind a switch lacking ACS and cannot be assigned Does anyone have PCI passthrough working on a BL460 G6 with CentOS 5.5? I then tried to connect the guest to a bridge. This worked once I did a "brctl setageingtime 0" on the bridge. However, I don't know the best way to make this change persistent. Any suggestions? Is there a better way to do this? Thanks for any input, David

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