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1608 discussions

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

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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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Differences between pc and q35
by C.L. Martinez 11 Dec '15

11 Dec '15

Hi all, What are the differences between pc and q35?? By default, virt-manager+libvirt setups kvm guest machine as a pc-i440fx-rhel7.1.0. [hicheck@ckvm015 ~]$ /usr/libexec/qemu-kvm -machine ? Supported machines are: pc RHEL 7.1.0 PC (i440FX + PIIX, 1996) (alias of pc-i440fx-rhel7.1.0) pc-i440fx-rhel7.1.0 RHEL 7.1.0 PC (i440FX + PIIX, 1996) (default) pc-i440fx-rhel7.0.0 RHEL 7.0.0 PC (i440FX + PIIX, 1996) rhel6.6.0 RHEL 6.6.0 PC rhel6.5.0 RHEL 6.5.0 PC rhel6.4.0 RHEL 6.4.0 PC rhel6.3.0 RHEL 6.3.0 PC rhel6.2.0 RHEL 6.2.0 PC rhel6.1.0 RHEL 6.1.0 PC rhel6.0.0 RHEL 6.0.0 PC q35 RHEL-7.1.0 PC (Q35 + ICH9, 2009) (alias of pc-q35-rhel7.1.0) pc-q35-rhel7.1.0 RHEL-7.1.0 PC (Q35 + ICH9, 2009) pc-q35-rhel7.0.0 RHEL-7.0.0 PC (Q35 + ICH9, 2009) none empty machine But according to this, q35 is more new virtual hardware. Why??

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Xen4CentOS and XSA-142
by Sarah Newman 10 Dec '15

10 Dec '15

It looks like no XSA-142 patch, which is "libxl fails to honour readonly flag on disks with qemu-xen" has been applied to Xen4CentOS. I assume this was on purpose? If not, I can have someone try adding the original patch from http://xenbits.xen.org/xsa/advisory-142.html and some variant of the commit from ef6cb76026628e26e3d1ae53c50ccde1c3c78b1b http://xen.1045712.n5.nabble.com/xen-master-libxl-relax-readonly-check-intr… . Thanks, Sarah

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win2008r2 update on centos 6 host made system unbootable
by Dennis Jacobfeuerborn 10 Dec '15

10 Dec '15

Hi, today we ran into a strange problem: When performing a regular Windows 2008r2 update apparently among other things the following was installed: "SUSE - Storage Controller - SUSE Block Driver for Windows" Previously the disk drive was using the Red Hat virtio drivers which worked just fine but after the reboot after the update I just get a blue screen indicating that Windows cannot find a boot device. Does anyone understand what is going on here? Why is the windows update installing a Suse driver that overrides the Red Hat driver even though it is apparently incompatible with the system? Regards, Dennis

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How to manually add a new interface to a bridge device?
by Howard Leadmon 09 Dec '15

09 Dec '15

Maybe my google-fu is failing me, but I have spent the past couple hours looking at how to add a vnet? Device to my KVM host running CentOS 6, and for the life of me I can't get this going. >From all my research if I want to add a device I should just do 'brctl addif br1 vnet14' if I want to add a vnet14 to bridge br1. When I do this, I get: # brctl addif br0 vnet14 interface vnet14 does not exist! If I run a 'brctl show' I get the following: # brctl show bridge name bridge id STP enabled interfaces br0 8000.00237dd22a4c no eth0 vnet0 vnet10 vnet11 vnet13 vnet2 vnet3 vnet4 vnet6 vnet8 br1 8000.00237dd22a50 no eth1 vnet1 vnet12 vnet5 vnet7 vnet9 Needless to say the existing vnet?? Devices are in use on guest VM's currently. When I create a new VM using virt-install, I usually add the following to my command line: --network=bridge:br0 --network=bridge:br1 I messed up building a new VM, and only added the br0 interface to the VM, but need the br1 interface as well. So my question is, or a pointer to how I can add that br1 interface to my existing VM, and create the needed vnet14 interface for it to attach to? If anyone can explain how to do this, or give me a good pointer on where the info is on how to do this, it would sure be a huge help.. Thanks. --- Howard Leadmon

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