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1612 discussions

Disable ps2 mouse and keyboard in a kvm guest
by C.L. Martinez 08 Jan '16

08 Jan '16

Hi all, I have to do some tests with a kvm guest but I need to disable ps2 mouse and ps2 keyboard and use only usb keyboard/mouse. When I try to remove them, virt-manager adds them automatically. How can I disable all ps2 devices? Any idea? Thanks.

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How to debug kernel with kernel-3.10.68-11.el6
by Xiaoding (B) 25 Dec '15

25 Dec '15

Hi all I used kernel-3.10.68-11.el6 as dom0 and config kdump I have got vmcore file when compute crash, but not found debuginfo package from http://debuginfo.centos.org/ I found kernel-3.10.68-11.el6 set CONFIG_DEBUG_INFO=n Why not set this key? Is there any other method to debug when compute crash Best Xiaoding

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CentOS 7.2 libvirtd 1.2.17 bug
by Pulkit Gupta 22 Dec '15

22 Dec '15

Hi, There is a strange issue in the CentOS 7.2 libvirtd 1.2.17 service. If there is a symlink in the "/etc/libvirt/qemu/autostart/" which is created before the libvirtd service is started, libvirtd wont start. Deleting the symlink from the autostart folder, then starting the libvirtd service works. Is this a know issue ? We have found this on 4-5 servers. Regards, Pulkit Gupta

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Missing module grub entry in xen-4.4.3-9 & boot issues
by Phill Bandelow 21 Dec '15

21 Dec '15

HI, We've started to see several issues with the Xen releases. Going back to basics I've used this guide https://wiki.centos.org/HowTos/Xen/Xen4QuickStart Once the install process is complete the grub.conf looks like this: default=0 timeout=5 splashimage=(hd0,0)/boot/grub/splash.xpm.gz hiddenmenu title CentOS (3.18.21-17.el6.x86_64) root (hd0,0) kernel /boot/xen.gz dom0_mem=1024M,max:1024M cpuinfo com1=115200,8n1 console=com1,tty loglvl=all guest_loglvl=all module /boot/vmlinuz-3.18.21-17.el6.x86_64 ro root=/dev/vda1 rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet title CentOS (2.6.32-573.12.1.el6.x86_64) root (hd0,0) kernel /boot/vmlinuz-2.6.32-573.12.1.el6.x86_64 ro root=/dev/vda1 rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet initrd /boot/initramfs-2.6.32-573.12.1.el6.x86_64.img title CentOS (2.6.32-358.el6.x86_64) root (hd0,0) kernel /boot/vmlinuz-2.6.32-358.el6.x86_64 ro root=UUID=71b203ab-36ea-4aa8-9ba3-78e4109f0ca4 rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet initrd /boot/initramfs-2.6.32-358.el6.x86_64.img As you can see the missing module line. If i manually run grub-bootxen.sh nothing changes. Manually adding the missing module entry: module /boot/initramfs-3.18.21-17.el6.x86_64.img Causes the following: https://www.dropbox.com/s/ley5nj29ubwqogc/Screenshot%202015-12-20%2011.10.1… Disabling APIC gives the following console output: https://www.dropbox.com/s/a6zgioxl9xpg20y/Screenshot%202015-12-20%2011.15.2… Now i know this is inside a KVM virtual machine, however we are starting to see this issue on at least 7 standard dedicated servers. [root@test ~]# rpm -qa | grep xen xen-libs-4.4.3-9.el6.x86_64 xen-hypervisor-4.4.3-9.el6.x86_64 xen-4.4.3-9.el6.x86_64 centos-release-xen-7-11.el6.x86_64 xen-licenses-4.4.3-9.el6.x86_64 xen-runtime-4.4.3-9.el6.x86_64 [root@test ~]# cat /etc/redhat-release CentOS release 6.7 (Final) [root@test ~]# [root@test ~]# cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 23 model name : Intel(R) Core(TM)2 Quad CPU Q9400 @ 2.66GHz stepping : 10 microcode : 1 cpu MHz : 2666.352 cache size : 4096 KB physical id : 0 siblings : 1 core id : 0 cpu cores : 1 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 13 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss syscall nx lm constant_tsc arch_perfmon unfair_spinlock pni ssse3 cx16 sse4_1 x2apic xsave hypervisor lahf_lm bogomips : 5332.70 -- Regards, Phill

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CentOS 7 libvirt-1.3.0-1 coming to virt-xen buildlogs
by George Dunlap 21 Dec '15

21 Dec '15

Centos 7.2 has updated its version of libvirt to 1.2.17, which ends up getting installed in preference to the previous virt-xen libvirt package (1.2.15). I've merged in the most recent Fedora libvirt package, 1.3.0, smoked tested it, and pushed it to buildlogs, which can be accessed by adding --enablerepo=centos-virt-xen-testing (after installing the CentOS 7 centos-release-xen package). Please test and let me know if there are any problems. -George

2 3

kvm-qemu-ev in testing
by Karanbir Singh 19 Dec '15

19 Dec '15

hi, kvm-qemu-ev from virt7-kvm-common-release is now signed and available on buildlogs.centos.org for testing, the corresponding release file is available in the centos/7/extras/ location on buildlogs as well. Once we have some testing, we can push and announce via mirror.centos.org for wider adoption. Regards, -- Karanbir Singh +44-207-0999389 | http://www.karan.org/ | twitter.com/kbsingh GnuPG Key : http://www.karan.org/publickey.asc

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XSAs: Updated CentOS 6 xen and kernel packages in buildlogs
by George Dunlap 17 Dec '15

17 Dec '15

xen-4.4.3-9 and kernel-3.18.21-17 (unsigneg) are now on buildlogs.centos.org, and signed packages should be making their way through the mirror system in the near future. Updated package sources can be found in the virt sig area on CentOS: https://github.com/CentOS-virt7/xen https://github.com/CentOS-virt7/xen-kernel The packages contain updates for XSAs 155, 157, 164, 165, and 166 (released today), as well as patches for XSA-142 and an update to XSA-158. For those urgent to install the updated packages, you can get them from buildlogs by enabling the centos-virt-xen-testing repository: yum --enablerepo=centos-virt-xen-testing update Please report any issues here on the list. -George

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Re: [CentOS-virt] CentOS-virt Digest, Vol 100, Issue 12
by Sahil Khan 15 Dec '15

15 Dec '15

Hi, I also face this kind of error while installing centos from usb drive and when I select it uefi mode in bios its got resolve the issue and finally i am able to install centos from usb drive. Regards, Sahil | 9930870258 On Mon, Dec 14, 2015 at 5:30 PM, <centos-virt-request(a)centos.org> wrote: > Send CentOS-virt mailing list submissions to > centos-virt(a)centos.org > > To subscribe or unsubscribe via the World Wide Web, visit > https://lists.centos.org/mailman/listinfo/centos-virt > or, via email, send a message with subject or body 'help' to > centos-virt-request(a)centos.org > > You can reach the person managing the list at > centos-virt-owner(a)centos.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of CentOS-virt digest..." > > > Today's Topics: > > 1. boot thumbdrive with CentOS 7 ISO??? (ken) > 2. Re: [CentOS] boot thumbdrive with CentOS 7 ISO??? (ken) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sun, 13 Dec 2015 16:48:25 -0500 > From: ken <gebser(a)mousecar.com> > To: CentOS mailing list <centos(a)centos.org>, centos-virt(a)centos.org > Subject: [CentOS-virt] boot thumbdrive with CentOS 7 ISO??? > Message-ID: <566DE7A9.9060307(a)mousecar.com> > Content-Type: text/plain; charset=utf-8; format=flowed > > The big picture is I'm wanting to boot centos 7 and install kvm. > > So far I've created on this new laptop a big, empty partition; in the > BIOS enabled legacy booting and disabled UEFI; also in BIOS under Legacy > Boot Order set "USB diskette on key/USB hard disk" on second priority. > I've tried to boot from a usb thumbdrive three times and it failed all > three times. I'm not understanding what's wrong. > > I tried all three methods below as root using CentOS 5.11, copied it to > the thumbdrive with: > > dd if=CentOS-7-x86_64-Everything-1503-01.iso of=/dev/sda bs=1024 > > (Tried this because some webpage said) > > isohybrid CentOS-7-x86_64-Everything-1503-01.iso > > dd if=~CentOS-7-x86_64-DVD-1503-01.iso of=/dev/sda > > None of these successfully booted. Instead they ignored the flash drive > as it wasn't there. > > Documentation in various webpages I found gave different recipes for > creating the thumbdrive contents (many of which didn't make sense to > me). Does anyone have experience with success with this...? > > Thanks much. > > > PS. Also in the BIOS, should I enable Virtualization Technology? I'm > sorting guess I should. The Windows docs recommend not to. I'm > thinking though it would be preferred for KVM. What's the certain verdict? > > > ------------------------------ > > Message: 2 > Date: Mon, 14 Dec 2015 04:30:08 -0500 > From: ken <gebser(a)mousecar.com> > To: CentOS mailing list <centos(a)centos.org>, centos-virt(a)centos.org > Subject: Re: [CentOS-virt] [CentOS] boot thumbdrive with CentOS 7 > ISO??? > Message-ID: <566E8C20.6080701(a)mousecar.com> > Content-Type: text/plain; charset=utf-8; format=flowed > > On 12/13/2015 05:00 PM, Frank Cox wrote: > > On Sun, 13 Dec 2015 16:48:25 -0500 ken wrote: > > > >> So far I've created on this new laptop a big, empty partition; in > >> the BIOS enabled legacy booting and disabled UEFI; also in BIOS > >> under Legacy Boot Order set "USB diskette on key/USB hard disk" on > >> second priority. I've tried to boot from a usb thumbdrive three > >> times and it failed all three times. I'm not understanding what's > >> wrong. > > > > I install Centos on pretty much everything by setting the bios to use > > USB as the primary boot device, then booting the Centos Live Image > > from a flash drive, then hitting the "install to hard drive" icon on > > the Live Desktop. After the installation is complete, set the bios > > back to use the hard drive as the primary boot device and you're all > > set. > > Aha! The problem was that, despite legacy was enabled and uefi was > disabled, the bios followed 'uefi boot order' and disregarded 'legacy > boot order'. Once I changed uefi boot order appropriately, the bios > booted the thumbdrive. > > However, when the centos menu came up, i.e.: > > Install CentOS 7 > Test this media & install CentOS 7 > Troubleshooting --> > > [use 'e' or 'c' keys] > > regardless of which of the above three I selected via right-arrow, I was > prompted by: > > error: invalid magic number. > error: you need to load the kernel first. > Press any key to continue... > > I tried also using the 'e' and 'c' keys off this menu; this brought into > other menus (which are too much to type up) and on another menu where ^E > and ^X can be used to 'edit' and 'execute' boot statements, none of > which works correctly or is obvious what to alter or enter. > > I also got into an interface with a 'grub>' prompt. I tried some of the > grub commands, but had little clue what to do with that. E.g., > "linuxefi /isolinux/isolinux.bin" returned "error: invalid magic > number." Interesting, but not getting CentOS 7 booted. > > Any know what else is possible? > > > > ------------------------------ > > _______________________________________________ > CentOS-virt mailing list > CentOS-virt(a)centos.org > https://lists.centos.org/mailman/listinfo/centos-virt > > > End of CentOS-virt Digest, Vol 100, Issue 12 > ******************************************** >

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Re: [CentOS-virt] [CentOS] boot thumbdrive with CentOS 7 ISO???
by ken 14 Dec '15

14 Dec '15

On 12/13/2015 05:00 PM, Frank Cox wrote: > On Sun, 13 Dec 2015 16:48:25 -0500 ken wrote: > >> So far I've created on this new laptop a big, empty partition; in >> the BIOS enabled legacy booting and disabled UEFI; also in BIOS >> under Legacy Boot Order set "USB diskette on key/USB hard disk" on >> second priority. I've tried to boot from a usb thumbdrive three >> times and it failed all three times. I'm not understanding what's >> wrong. > > I install Centos on pretty much everything by setting the bios to use > USB as the primary boot device, then booting the Centos Live Image > from a flash drive, then hitting the "install to hard drive" icon on > the Live Desktop. After the installation is complete, set the bios > back to use the hard drive as the primary boot device and you're all > set. Aha! The problem was that, despite legacy was enabled and uefi was disabled, the bios followed 'uefi boot order' and disregarded 'legacy boot order'. Once I changed uefi boot order appropriately, the bios booted the thumbdrive. However, when the centos menu came up, i.e.: Install CentOS 7 Test this media & install CentOS 7 Troubleshooting --> [use 'e' or 'c' keys] regardless of which of the above three I selected via right-arrow, I was prompted by: error: invalid magic number. error: you need to load the kernel first. Press any key to continue... I tried also using the 'e' and 'c' keys off this menu; this brought into other menus (which are too much to type up) and on another menu where ^E and ^X can be used to 'edit' and 'execute' boot statements, none of which works correctly or is obvious what to alter or enter. I also got into an interface with a 'grub>' prompt. I tried some of the grub commands, but had little clue what to do with that. E.g., "linuxefi /isolinux/isolinux.bin" returned "error: invalid magic number." Interesting, but not getting CentOS 7 booted. Any know what else is possible?

1 0

boot thumbdrive with CentOS 7 ISO???
by ken 13 Dec '15

13 Dec '15

The big picture is I'm wanting to boot centos 7 and install kvm. So far I've created on this new laptop a big, empty partition; in the BIOS enabled legacy booting and disabled UEFI; also in BIOS under Legacy Boot Order set "USB diskette on key/USB hard disk" on second priority. I've tried to boot from a usb thumbdrive three times and it failed all three times. I'm not understanding what's wrong. I tried all three methods below as root using CentOS 5.11, copied it to the thumbdrive with: dd if=CentOS-7-x86_64-Everything-1503-01.iso of=/dev/sda bs=1024 (Tried this because some webpage said) isohybrid CentOS-7-x86_64-Everything-1503-01.iso dd if=~CentOS-7-x86_64-DVD-1503-01.iso of=/dev/sda None of these successfully booted. Instead they ignored the flash drive as it wasn't there. Documentation in various webpages I found gave different recipes for creating the thumbdrive contents (many of which didn't make sense to me). Does anyone have experience with success with this...? Thanks much. PS. Also in the BIOS, should I enable Virtualization Technology? I'm sorting guess I should. The Windows docs recommend not to. I'm thinking though it would be preferred for KVM. What's the certain verdict?

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