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1610 discussions

Trouble with virtio storage
by Vladimir Vuksan 02 Feb '11

02 Feb '11

I am trying to get a custom Centos 5 image going under Openstack Nova (a cloud framework). Trouble I have is that for whatever reason virtio storage doesn't work for me. For example if the VM is started using these options <os> <type>hvm</type> <kernel>/opt/nova-state/instances/instance-00000045/kernel</kernel> <cmdline>root=/dev/vda console=ttyS0</cmdline> <initrd>/opt/nova-state/instances/instance-00000045/ramdisk</initrd> </os> <disk type='file'> <driver type='qcow2'/> <source file='/opt/nova-state/instances/instance-00000045/disk'/> <target dev='vda' bus='virtio'/> </disk> Booting fails Creating root device. Mounting root filesystem. mount: could not find filesystem '/dev/root' If I then destroy the VM, change root to be /dev/sda and target dev=sda with bus=ide things boot properly. Kernel and ramdisk being used to boot are these vmlinuz-2.6.18-194.26.1.0.1.el5 initrd-2.6.18-194.26.1.0.1.el5.img I even tried Oracle's 2.6.32 kernels with same results. Underlying host OS is Oracle EL 5.5 Any clues ? Vladimir

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OT: Recommendations for a virtual storage server
by carlopmart 02 Feb '11

02 Feb '11

Hi all, I need to install a virtual machine acting as a virtual storage server under CentOS 5.x (using kvm, xen, virtualbox or vmware). This virtual storage machine needs to server storage to another ESXi server and at the same time to the host where is installed. This is due to the limitations of hardware I have available. Both hosts needs to server several machines. It is very important that the virtual machine consumes the least resources possible (host has 5GB RAM and i need to run three virtual machines minimum, including this storage server as a virtual machine). What can be better solution: CentOS, NexentaStor, openfiler ...?? Many thaks. -- CL Martinez carlopmart {at} gmail {d0t} com

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KVM and USB support
by MargoAndTodd 30 Jan '11

30 Jan '11

Hi All, Can anyone with access to RHEL 6 tell me if the "official" KVM supports USB ports under Windows guests? (I would like to be able to operate Logitech's universal remote.) Many thanks, -T

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How to send sysrq on "virsh console"
by David Knierim 27 Jan '11

27 Jan '11

I have a KVM guest running on CentOS 5.5 that is in a bad state. I would like to dump the kernel information using magic-sysrq commands, but I cannot figure out how to send a break on the virtaul serial port provided by "virsh console". The guest is a standard install that will respond if I can send a break on the virtual serial port. Is it possible to send a break on the virtual serial port? Thanks, David

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cluster of virtual machines using libvirt/kvm + Gluster
by iarly selbir 27 Jan '11

27 Jan '11

Hi guys, I posted this question at virt list on Fedora Project but I guess its a best place to ask help for my problem. I'm trying to set up two kvm/libvirt hosts, I installed the set of packages contained in @kvm and @clustering groups, downloaded and installed glusterfs version 3.1.2, configured the cluster ( all working ), configured the gluster volume and mounted it on /var/lib/libvirt/images. The problem is when I try to create the VM, after click in finish(virt-manager) it returns the following error: Unable to complete install 'libvirt.libvirtError internal error unable to start guest: qemu: could not open disk image /var/lib/libvirt/images/test.img Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/create.py", line 724, in do_install dom = guest.start_install(False, meter = meter) File "/usr/lib/python2.4/site-packages/virtinst/Guest.py", line 541, in start_install return self._do_install(consolecb, meter, removeOld, wait) File "/usr/lib/python2.4/site-packages/virtinst/Guest.py", line 633, in _do_install self.domain = self.conn.createLinux(install_xml, 0) File "/usr/lib64/python2.4/site-packages/libvirt.py", line 974, in createLinux if ret is None:raise libvirtError('virDomainCreateLinux() failed', conn=self) libvirtError: internal error unable to start guest: qemu: could not open disk image /var/lib/libvirt/images/test.img # /var/log/messages Jan 18 05:36:05 kvmsrv001 libvirtd: 05:36:05.227: error : internal error Timed out while reading console log output Jan 18 05:36:05 kvmsrv001 libvirtd: 05:36:05.227: error : internal error unable to start guest: qemu: could not open disk image /var/lib/libvirt/images/test.img the image disk was created, but the domain(vm) is not. does someone experienced with this error? If I umount the gluster partition and use local disk the vm creation works fine. Any suggestion will be appreciated. - - iarlyy selbir :wq!

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Francisco Pérez invited you to Dropbox
by Dropbox 25 Jan '11

25 Jan '11

Francisco Pérez wants you to use Dropbox to sync and share files online and across computers. Get started here: http://www.dropbox.com/link/20.lES1DC1WLp/NjYyMTI3NTcxNw?src=referrals_bulk6 - The Dropbox Team ____________________________________________________ To stop receiving invites from Dropbox, please go to http://www.dropbox.com/bl/05f2e2971bc2/centos-virt%40centos.org

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hot-plug vfb on Xen domU?
by Chris Wik 18 Jan '11

18 Jan '11

I want to give my clients access to their Xen domU consoles using VNC. This works great using vfb device configured as type=vnc. However I have 2 problems: * I can't figure out how I can add a vfb device to a running domain without restarting it (I have 100+ domU's I want to enable this on, and want to avoid restarting them all if possible) * Related, I can't figure out how I can change the VNC password without restarting the domU, as the password is specified in the vfb config. Is what I am trying to do possible? How? In case it matters: # xm info host : <my.supersecret.hostname> release : 2.6.18-194.26.1.el5xen version : #1 SMP Tue Nov 9 13:35:30 EST 2010 machine : x86_64 nr_cpus : 4 nr_nodes : 1 sockets_per_node : 1 cores_per_socket : 4 threads_per_core : 1 cpu_mhz : 2394 hw_caps : bfebfbff:28100800:00000000:00000140:0098e3fd:00000000:00000001 total_memory : 24566 free_memory : 8317 node_to_cpu : node0:0-3 xen_major : 3 xen_minor : 1 xen_extra : .2-194.26.1.el5 xen_caps : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64 xen_pagesize : 4096 platform_params : virt_start=0xffff800000000000 xen_changeset : unavailable cc_compiler : gcc version 4.1.2 20080704 (Red Hat 4.1.2-48) cc_compile_by : mockbuild cc_compile_domain : centos.org cc_compile_date : Tue Nov 9 12:45:24 EST 2010 xend_config_format : 2 Thanks in advance -- Chris Wik Anu Internet Services Ltd

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Centos 5.5 KVM GRUB / Virtio issue
by Ken Bass 12 Jan '11

12 Jan '11

I have a virtual machine that had been running fine using a RAW disk image (IDE). I am in the process of converting this virtual machine to use a single LVM and virtio. (For LVM backup snapshots and easy resizing purposes (no LVM within the guest)) I create the LVM and copied all the files from the existing RAW image to an ext3 under the LVM. However, I cannot get it to boot. It has to do with GRUB and I cannot figure out why the stupid thing is not working as it should. I boot the guest using the Centos 5.5 DVD and select Rescue and chroot /mnt/sysimage <><> fdisk -l shows: Disk /dev/vda: 21.4 GB, 21474836480 bytes 213 heads, 34 sectors/track, 5791 cylinders Units = cylinders of 7242 * 512 = 3707904 bytes Device Boot Start End Blocks Id System /dev/vda1 1 5792 20970496 83 Linux <><> cat /boot/grub/device.map shows: (hd0) /dev/vda <><> However grub cannot find the /boot/grub/stage1. I ran grub and did the following: device (hd0) /dev/vda OK root (hd0,0) Filesystem type is ext2fs, partition type 0x83 setup (hd0) Checking if "/boot/grub/stage1" exists... no Checking if "/grub/stage1" exists... no Error 2: Bad file or directory type find /boot/grub/stage1 Error 15: File not found <><> However, there is most definitely a /boot/grub/stage1 in the (hd0,1) - I copied the entire boot directory from the RAW IDE image to the LVM. Even 'find /sbin/init' fails. Now find works at all. My host is Fedora 14. What is odd is that I created a different virtual machine by going through the whole Centos 5.5 DVD Install process and that one works. In this non working case, I've copied the files over to the LVM and it seems GRUB is the only issue/difference. I can boot the DVD installed one and run the above grub find command and it finds the stage1 fine.

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KVM usb to serial converter issue....
by Tom Bishop 11 Jan '11

11 Jan '11

So I have something that I am trying to do in kvm that requires a usb to serial converter...that goes to a serial device. I pass the usb to serial device via a physical device and win7 discovers the device and assigns it a com port...all is good until I reboot win7 and I have to remove the device and re-add it from kvm...it then discovers it and assigns it a new com port. If I look in windows it appears that the com port it was originally using shows that it is in use..so I think that is the issue but not sure how to correct it so every time I reboot I dont have to re-add... my xml snippet... <hostdev mode='subsystem' type='usb' managed='yes' <source> <vendor id='0x067b'/> <product id='0x2303'/> </source> </hostdev> Any thoughts...would be appreciated...Thanks! :)

1 0

Discover DHCP addresses
by AustinPowered 21 Dec '10

21 Dec '10

Is there is way on the command line of the host to determine the IP address of a guest virtual machine? Perhaps a way to find out what addresses have been assigned by the DHCP server on the host? Thanks, -- AustinPowered

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