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1612 discussions

Enabling enhanced neetworking for CentOS 6 bqse images in AWS
by Nico Kadel-Garcia 06 Sep '15

06 Sep '15

I've made a few OS's from the the CentOS 6 base images in AWS, and they're working quite wwell. But I'm reaalizing that they do not have the enhanced networking enabled by default. And I'm also realizing that I have to *stop* the OS in AWS terms, enable network enhanced networking manually, and lose all the contengs of my ephemereal storage when I do this. Is there any reason not to enable enhanced networking by default, in the base CentOS 6 image and same a painful and painful step for AWS users?

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Centos Xen libvirt question
by Chuck Meade 04 Sep '15

04 Sep '15

Hello, Looking for libvirt-daemon-xen for Centos 7. Does anyone have the location of this package? Thanks, Chuck

2 2

Assigning a PCI sound device to a VM
by Robert Nichols 03 Sep '15

03 Sep '15

I have a PCI sound card that I would like to assign to a VM, but when I try to do so the VM fails to start and displays this message: Error starting domain: Unable to read from monitor: Connection reset by peer Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/asyncjob.py", line 44, in cb_wrapper callback(asyncjob, *args, **kwargs) File "/usr/share/virt-manager/virtManager/asyncjob.py", line 65, in tmpcb callback(*args, **kwargs) File "/usr/share/virt-manager/virtManager/domain.py", line 1125, in startup self._backend.create() File "/usr/lib64/python2.6/site-packages/libvirt.py", line 686, in create if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self) libvirtError: Unable to read from monitor: Connection reset by peer The XML generated by virt-manager for the device is <hostdev mode='subsystem' type='pci' managed='yes'> <source> <address domain='0x0000' bus='0x07' slot='0x04' function='0x0'/> </source> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/> </hostdev> The sound card is an Asus Xonar DGX PCIe 5.1, and identifies itself as "07:04.0 Multimedia audio controller: C-Media Electronics Inc CMI8788 [Oxygen HD Audio]". I see the same problem if I try to assign the motherboard's Intel Xeon E3-1200 HD Audio Controller to the VM. Both of these devices are supported by the host kernel (3.18.17-13.el6.x86_64). I have no problem assigning a USB sound device, but those have very limited capability. -- Bob Nichols "NOSPAM" is really part of my email address. Do NOT delete it.

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qemu-kvm-ev with CentOS 7.1
by Gena Makhomed 18 Aug '15

18 Aug '15

Hello, All! Is it possible to use binary packages build from http://resources.ovirt.org/pub/ovirt-3.5/rpm/el7/SRPMS/qemu-kvm-ev-2.1.2-23… with plain CentOS 7.1 and use all other packages from CentOS (libvirt, virt-manager, etc) Is it have reasons, if I not use live migrations and qcow2 snapshots? (instead use zfs, zvols and zfs snapshots for VM disks online backups) Is using qemu-kvm-ev with CentOS 7.1 have any disadvantages? -- Best regards, Gena

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Adding customized options to qemu command line
by C. L. Martinez 18 Aug '15

18 Aug '15

Hi all, How can I add some options to qemu command line when a kvm guest starts up from libvirtd??

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Kubernetes 1.1.0 in virt7-docker-common-testing
by Navid Shaikh 11 Aug '15

11 Aug '15

Hi, Kubernetes package build kubernetes-1.1.0-0.4.git2bfa9a1.el7 is updated in virt7-docker-common-testing repo [1]. Please test and feedback. [1] http://cbs.centos.org/repos/virt7-docker-common-testing/x86_64/os/ -- Navid IRC: nshaikh

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How to kickstart a guest with Centos 6.6 & Xen 4.4
by Elliot Fox 03 Aug '15

03 Aug '15

Hello, I posted a question over at xenproject.org but it was recommended that I send out a message here for help. My post there: http://www.xenproject.org/help/questions-and-answers/vanilla-pv-centos-gues… The TL;DR is: Everything I've found to kickstart a new vanilla rhel/centos guest points to specifying a kernel & and initrd- for RHEL/Centos 5. But where is the xen initrd for Centos 6? The Xen4Quickstart instructions are awesome, but after install you are left with a kernel and an initramfs & no initrd for a centos 6 guest in xen. So is there a better way to kickstart a fresh/vanilla VM post Xen4Quickstart instructions? Shall I build an initrd from the initramfs (and how) or is there another way? Apologies if this is discussed elsewhere, but if it is I have yet to find it and I've been looking around for some time. Thank you!

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Timezone issues with migrations between host kernel 3.10 and 3.18
by Nathan March 30 Jul '15

30 Jul '15

Hi All, I'm seeing clock issues with live migrations on the latest kernel packages, migrating a VM from 3.10.68-11 to 3.18.17-13 results in the VM clock being off by 7 hours (I'm PST, so appears to be a timezone issue). This is also between xen versions, but rolling the target back to 3.10 resolved so don't believe the recent XSA's are related. Anyone else seen behavior like this or have any ideas on how to resolve? - Nathan

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Re: [CentOS-virt] Where are the Centos 7.1 1503 KVM repos please?
by Keith Roberts 27 Jul '15

27 Jul '15

Thanks for all the replies. Looking at the specs for the processor it does not seem to have the vmx features in /proc/cpuinfo: http://www.notebookcheck.net/Intel-Core-2-Duo-T6400-Notebook-Processor.3510… and the output from grep -E ‘vmx|svm’ /proc/cpuinfo is empty. /lib/modules/3.10.0-229.7.2.el7.x86_64/kernel/arch/x86/kvm [keith.roberts@acer-centos kvm]$ ls kvm-amd.ko kvm-intel.ko kvm.ko [keith.roberts@acer-centos kvm]$ [keith.roberts@acer-centos kvm]$ modprobe kvm-intel modprobe: ERROR: could not insert 'kvm_intel': Operation not permitted [keith.roberts@acer-centos kvm]$ lsmod | sort ... iwlwifi 112501 1 iwldvm jbd2 102940 1 ext4 kvm 461126 0 libahci 32009 1 ahci [keith.roberts@acer-centos kvm]$ modprobe kvm-amd modprobe: ERROR: could not insert 'kvm_amd': Operation not permitted [keith.roberts@acer-centos kvm]$ modprobe kvm-intel modprobe: ERROR: could not insert 'kvm_intel': Operation not permitted Is it still possible to create some KVM type virtual machines with this laptop, to be ported to the VM host server machine later, or do I need another laptop with the required CPU flags? Kind Regards, Keith On 24 Jul 2015, at 16:46, Marcos Amorim <marcosmamorim(a)gmail.com> wrote: > Keith, > > What error? > > What's your processor? if it's AMD, you need modprobe kvm_amd instead of kvm_intel. > > > Marcos Amorim > > > > 2015-07-24 12:27 GMT-03:00 Keith Roberts <keith.roberts(a)ecric.nhs.uk>: > > On 24 Jul 2015, at 15:51, Marcos Amorim <marcosmamorim(a)gmail.com> wrote: > >> >> Warning: This message contains unverified links which may not be safe. You should only click links if you are sure they are from a trusted source. >> Keith, >> >> Try modprobe >> modprobe kvm >> modprobe kvm_intel >> >> >> Regards, >> >> >> Marcos Amorim > > Thanks Marcos. > > I tried modprobe kvm and that loaded that kernel module. > > I got an error trying to load the kvm_intel module though. > > Kind Regards, > > Keith > > > _______________________________________________ > CentOS-virt mailing list > CentOS-virt(a)centos.org > http://lists.centos.org/mailman/listinfo/centos-virt > > > _______________________________________________ > CentOS-virt mailing list > CentOS-virt(a)centos.org > http://lists.centos.org/mailman/listinfo/centos-virt

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XSA-138: Updated packages available (xen-4.4.2-5)
by George Dunlap 27 Jul '15

27 Jul '15

The Xen Project has publicly released XSA-138: http://xenbits.xen.org/xsa/advisory-138.html All users using HVM (fully virtualized) guests with emulated CDROM drives are advised to upgrade. There are signed versions of Xen4CentOS6 packages uploaded to the mirror system. There are also unsigned packages available on the CBS: http://cbs.centos.org/repos/virt6-testing/x86_64/os/Packages/ http://cbs.centos.org/repos/virt7-xen-44-testing/x86_64/os/Packages/ -George

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