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1608 discussions

Should I switch and if so what is the procedure
by Rich 07 Oct '11

07 Oct '11

Since the Xen and Linux kernel people have finally made peace and Xen is going to be included with the kernel, should I keep using the Xen virtual server with Centos or should I switch to KVM? I am running Centos 5.7 now. I guess the real question is can I still use Xen with Centos 6?

10 13

kvm-qemu: unable to execute QEMU command savevm (monitor missing?)
by Jason Brian Friedrich 05 Oct '11

05 Oct '11

System: CentOS Linux release 6.0 (final) Kernel: 2.6.32-71.23.1.el6.x86_64 KVM: QEMU PC emulator version 0.12.1 (qemu-kvm-0.12.1.2) Libvirt: ibvirtd (libvirt) 0.8.1 Hi everyone, I only recently subscribed to this list and hope you can shed some light on the following error. I created a VM on my Centos 6 KVM machine, used a qcow2 image and wanted to create a snapshot via 'virsh snapshot-create' command: // [root@kvmhost ~]# virsh snapshot-create server01 error: internal error unable to execute QEMU command 'savevm': The command savevm has not been found \\ I googled before the post, found some [0] threads [1], but could not find an answer how to solve the problem. If the kvm-qemu lacks the support of a savevm monitor, how can I add one? Do I need to recompile kvm-qemu with special flags or is simply a RPM package or a module missing? Thanks in advance, - Jason [0] http://lists.centos.org/pipermail/centos-virt/2011-July/002557.html [1] https://www.redhat.com/archives/libvirt-users/2011-August/msg00011.html

2 3

overlay image on centos 6 do not work
by Kai Krueger 04 Oct '11

04 Oct '11

Hello, I have some problems with overlay images on a host running centos 6.0 * I have 2 physical hosts, one running centos 5.5, the other running centos 6.0 * I created a virtual linux host with a raw file image centos6.img I can start this vm on both machines. * then I created an overlay of the file image with qemu-img create -b centos6.img -f qcow2 centos6.ovl when I start the VM from the ovelay on the centos6 machine I get: --- Booting from Hard Disk... Boot failed: not a bootable disk No bootable device --- When booting from the raw-image and adding the overlay as second disk I see the following: ========== cut here ========== fdisk -l Disk /dev/vda: 8598 MB, 8598323200 bytes 255 heads, 63 sectors/track, 1045 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000bb12f Device Boot Start End Blocks Id System /dev/vda1 * 1 1046 8395776 83 Linux Disk /dev/vdb: 0 MB, 262144 bytes 16 heads, 63 sectors/track, 0 cylinders Units = cylinders of 1008 * 512 = 516096 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/vdb doesn't contain a valid partition table ========== cut here ========== As one can see, the overlay image does not have any partition table. Starting the vm with exactly these images (per nfs-mount) on the centos-5.5 host works properly. Is my problem an known bug or is it an old feature that has been removed? Best regards, Kai Krueger ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program.

1 0

Strange problem with guest having more than 3 virtual interfaces.
by Veli-Pekka Kestilä 02 Oct '11

02 Oct '11

Hi, I have 6 DomU's with 4-virtual interfaces and 1 DomU with only one. When starting the DomU's in order where the domain with only one interface is started last it refuses to start with following error. If I start it first there is no problem starting them all. ---Error--- [2011-10-02 18:37:33 xend.XendDomainInfo 6728] DEBUG (XendDomainInfo:1335) XendDomainInfo.handleShutdownWatch [2011-10-02 18:37:33 xend 6728] DEBUG (DevController:179) Waiting for devices vif. [2011-10-02 18:37:33 xend 6728] DEBUG (DevController:184) Waiting for 0. [2011-10-02 18:37:33 xend 6728] DEBUG (DevController:571) hotplugStatusCallback /local/domain/0/backend/vif/8/0/hotplug-status. [2011-10-02 18:39:13 xend 6728] DEBUG (DevController:94) Lock released [2011-10-02 18:39:13 xend 6728] DEBUG (DevController:96) Lock not acquired, cannot release [2011-10-02 18:39:13 xend 6728] ERROR (SrvBase:88) Request wait_for_devices failed. Traceback (most recent call last): File "/usr/lib64/python2.4/site-packages/xen/web/SrvBase.py", line 85, in perform return op_method(op, req) File "/usr/lib64/python2.4/site-packages/xen/xend/server/SrvDomain.py", line 72, in op_wait_for_devices return self.dom.waitForDevices() File "/usr/lib64/python2.4/site-packages/xen/xend/XendDomainInfo.py", line 2583, in waitForDevices self.waitForDevices_(c) File "/usr/lib64/python2.4/site-packages/xen/xend/XendDomainInfo.py", line 1563, in waitForDevices_ return self.getDeviceController(deviceClass).waitForDevices() File "/usr/lib64/python2.4/site-packages/xen/xend/server/DevController.py", line 181, in waitForDevices return map(self.waitForDevice, self.deviceIDs()) File "/usr/lib64/python2.4/site-packages/xen/xend/server/DevController.py", line 192, in waitForDevice raise VmError("Device %s (%s) could not be connected. " VmError: Device 0 (vif) could not be connected. Hotplug scripts not working. [2011-10-02 18:39:13 xend.XendDomainInfo 6728] DEBUG (XendDomainInfo:2387) XendDomainInfo.destroy: domid=8 [2011-10-02 18:39:13 xend 6728] DEBUG (DevController:94) Lock released [2011-10-02 18:39:13 xend 6728] DEBUG (DevController:94) Lock released [2011-10-02 18:39:13 xend.XendDomainInfo 6728] INFO (XendDomainInfo:2528) Dev 51712 still active, looping... [2011-10-02 18:39:14 xend.XendDomainInfo 6728] INFO (XendDomainInfo:2528) Dev 51712 still active, looping... [2011-10-02 18:39:14 xend.XendDomainInfo 6728] INFO (XendDomainInfo:2528) Dev 51712 still active, looping... ---Error--- Greetings, Veli-Pekka Kestilä

1 0

Second VM cannot use the network.
by Magicloud Magiclouds 30 Sep '11

30 Sep '11

Hi, I started to use libvirt and kvm yesterday. The first VM works great. Today I made another VM, same configuration as before. But its network just did not work. The guest cannot even get a dhcp ip. The network is NAT mode. The first VM got internal ip correctly. The command I made the VM is: virt-install -nzabbix1 -r2048 --vcpus=2 -c/var/lib/libvirt/images/CentOS-6.0-x86_64-netinstall.iso --os-type=linux --os-variant=rhel6 --disk vol=kvmguests/zabbix1 --vnc -v --virt-type=kvm --check-cpu --prompt --arch=x86_64 --vnclisten=0.0.0.0 --noautoconsole --noreboot --autostart What should I do? -- 竹密岂妨流水过山高哪阻野云飞

1 0

Network and IP's
by Thomas Rønshof 27 Sep '11

27 Sep '11

Hi, When "playing" with Cent OS 5.x Virtualization, I could have a host with IP:192.168.10.40 and the guests with IP's: 192.168.10.41, 192.168.10.42... an so on. But now after installing Cent OS 6.0 as a host, I can't figure out how to make my guest get the same IP's. My host is still 192.168.10.40, but the 1. guest i make, get an IP of 192.168.122.x ! I can see something in virtual-manager concerning virtual-networks. It looks new compared to COS 5.x. Is it not possible ? Regards Thomas

4 8

Storage and backup considerations
by Thomas Rønshof 27 Sep '11

27 Sep '11

Hi, Some very newbie questions. I have to move an old SCO-Unix server to a Cent OS 6.0 guest on a Cent OS 6.0 Host. The space used on the SCO is 65 GB. How shall i plan the storage ? Make an image based guest of 100 GB an install on that ? Or is LVM based better regarding performance ? Should i allocate 100GB or 200 GB ? What is best ? What about backup ? Should i take backup from the guest with tar/cpio or backup of the image file on the host ? What is the preferable ? Regards Thomas.

1 0

Packet loss between Xen machines
by Aaron Linnen 26 Sep '11

26 Sep '11

We are experiencing some packet loss between xen machines which we haven't seen before. Is this a problem anyone's run into before and/or has ideas on how to diagnose the issue? The setup is CentOS 5 xen-3.0.3-80.el5_3.3 Aaron

3 4

Connection does not support host device enumeration
by Kaushal Shriyan 22 Sep '11

22 Sep '11

Hi, I have "20:04.0 Network controller: Sangoma Technologies Corp. A104d QUAD T1/E1 AFT card" on Host OS, Its not visible on guest OS using linux KVM application. I did open the window for guest from virt-manager on my Ubuntu Linux Desktop 11.04, shut down the guest, then select the "Details" view from the menu on that window, and click "Add Hardware" at the bottom, select "PCI Host Device" in the selections on the left, and find your device in the list of host devices on the right. Then click "Finish". Finally, start your guest up again, and the device should appear. I get "Connection does not support host device enumeration" Any clue ? libvirt-0.8.2-22.el5 version running on CentOS Linux Server version 5.6 Please let me know if you need any additional information Regards, Kaushal

1 0

Linux KVM on CentOS 5.6
by Kaushal Shriyan 21 Sep '11

21 Sep '11

Hi, I have IBM x3650M3 Server with 2 Physical CPU each with quad core configs and 32GB of physical RAM and 600 GB usable space. I am using linux kvm for this purpose. Please correct or suggest me if i am doing wrong I have installed CentOS 5.6 on physical server as host OS. I need to create 2 Virtual Machines with similar configs. virt-install --connect qemu:///system -n vm1 -r 15000 --cpuset=auto -f /var/tmp/vm1.qcow2 -s 200 -c /var/lib/libvirt/images/CentOS-5.6-x86_64-bin-DVD-1of2.iso --vnc --noautoconsole --os-type linux --os-variant generic26 --accelerate --network=bridge:br0 --hvm virt-install --connect qemu:///system -n vm2 -r 15000 --cpuset=auto -f /var/tmp/vm2.qcow2 -s 200 -c /var/lib/libvirt/images/CentOS-5.6-x86_64-bin-DVD-1of2.iso --vnc --noautoconsole --os-type linux --os-variant generic26 --accelerate --network=bridge:br0 --hvm Please let me know the recommended method if there are any changes need to be done in the above command line. I would be eventually running asterisk PBX application on these 2 VM's and also let me know if 2 GB of physical RAM is sufficient for Host OS. Regards, Kaushal

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