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1608 discussions

Issues with Ubuntu 14 as a guest VM, and network throughput..
by Howard Leadmon 30 Sep '14

30 Sep '14

I have a CentOS 6.5 server running as a host for about a dozen other VM's, and all were running just fine. I had a mix of CentOS, Ubuntu, and FreeBSD VM's running, no problem at all. I then updated the Ubuntu VM's to the newer 14.x release, and that installed a 3.13 linux kernel, and after that (which I didn't notice right at the start) the network throughput outbound was abysmal at best. Where before I could move an ISO image in just moments, trying to send out an image from the VM now took forever, with constant timeouts. I tried it on multiple Ubuntu VM's and all have the exact same issue. I thought this is strange, the older 12.x stuff ran just fine, so I thought well the networking is in the kernel so let's back up the kernel. So I grabbed a 3.11 kernel and loaded it, and that was a good improvement, but still no winner, so then I backed off to a 3.8.13 kernel which seemed to be the newest of the 3.8's, and bingo everything started working fine. I then tried a couple Ubuntu machines that were standalone boxes (not VM's) with the newer 3.13 it loads by default, and running independent like that throughput is great, so it's some interaction with the qemu/kvm host. Has anyone run into this, or have any idea, or know of any tunable changes I can make that would make the VM play nice with the newer recommended kernel? I was actually stunned changing kernels made the diff between getting hundreds of megs of throughput on the host, to getting a meg or two if lucky, with constant pauses. At the same time, my other CentOS and FBSD VM's seem to run fine, but then again CentOS sticks with an older kernel it seems. --- Howard

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vTPM manager for Xen
by Jordan 24 Sep '14

24 Sep '14

Hello everyone, I am sorry for interrupting your work I am following the correspondence in silence. I am trying to build a vtpm implementation into xen 6.2 but I was not able to find all the means to do it. What can be found is just abstract knowledge. Most of the info always forwards me to this doc http://xenbits.xen.org/docs/unstable/misc/vtpm.txt I found the tpm emulator 0.7.4 and build it into centos 5.9 x64 PV vm. I have access from that VM to the TPM as well via trousers. What I cannot find is the vTPM manager that distributes vTpms to domains. Is this feature deprecated ? Nobody anywhere is talking about it. I am a little confused as there was measurement boot module supporting TXT boot released by citrix not long ago but there is no doc that can give me any info on how to/ or where from to get that management TPM software. Best regards, Jordan

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Reminder: Virt SIG meeting tomorrow
by George Dunlap 22 Sep '14

22 Sep '14

Just a reminder, the Virt SIG meeting is tomorrow on IRC (channel #centos-devel) at 1pm UTC (2pm BST, 9am EST). I've (finally) done a draft update of the Virt SIG roadmap: http://wiki.centos.org/SpecialInterestGroup/Virtualization/Roadmap The concept I had was to have a number of different "projects" within the SIG (Xen, Docker, Xapi, oVirt), each with its own maintainer that would be in charge of the packages. The page is meant to be able to help people get an idea of what each project's overall goal, component packages and how to submit modifications (via git pull requests), status, and miscellaneous other things that need to be done. We should probably define at least a very basic path for approving projects / maintainers, getting rid of inactive projects, &c. I'd be fine with, "Someone makes a proposal on centos-virt with $INFORMATION; Lars and / or KB approve it" to begin with; we can always add more structure later if we need. Anyway, all just ideas -- we can talk about it at the meeting tomorrow. -George

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libvirt/kvm changes /dev/ttyS0
by lhecking＠users.sourceforge.net 19 Sep '14

19 Sep '14

A new kvm guest on a CentOS6.5 x84_64 host is set up to make use of the serial port (virt-install ... --serial dev,path=/dev/ttyS0) <serial type='dev'> <source path='/dev/ttyS0'/> <target port='0'/> </serial> <console type='dev'> <source path='/dev/ttyS0'/> <target type='serial' port='0'/> </console> When I launch the vm, setroubleshootd goes into overdrive and creates massive logs, and /var/log/messages starts growing significantly also. The reason is that as soon as the vm starts, ownership and context of /dev/ttyS0 on the host are being reset. Why is that, and how can I prevent it from happening? Should be: crw-rw----. root dialout system_u:object_r:tty_device_t:s0 /dev/ttyS0 Changes to: crw-rw----. qemu qemu unconfined_u:object_r:svirt_image_t:s0:c9,c796 /dev/ttyS0

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Re: [CentOS-virt] How do I do Centos 7 p2v migration?
by SilverTip257 19 Sep '14

19 Sep '14

On Wed, Sep 17, 2014 at 8:37 AM, <me(a)tdiehl.org> wrote: > On Wed, 20 Aug 2014, Gilberto Nunes wrote: > > Do you get it?? >> > > Yes, I got it working. Turned out it was much simpler than I was making it. > I did not need clonezilla or anything else except rsync. > > What I did was a minimal install of the same os the original machine was > running, and then rsync the original machine over top of the new VM, > excluding > things like fstab, inittab, and other things that are specific to the > hardware. > +1 I've done this exact process myself, but neglected to mention it to you. Can't beat installing off a local mirror and then rsyncing a few small differences (or much less compared the entire install) between the two machines! ;-) > > This allows me to keep the original machine on line until just before I am > ready to kill it off. When I am ready to kill off the old machine and start > the new one I stop all externally accessible services, change the network > config > to reflect the way I want it in production, do 1 last rsync, reboot and I > am live. > > Typical down time has been less than 15 minutes. > > It takes a little tinkering to figure out the stuff that should be > excluded but > once I got that it went well. > That's the fun of it, eh? -- ---~~.~~--- Mike // SilverTip257 //

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How do I do Centos 7 p2v migration?
by me＠tdiehl.org 17 Sep '14

17 Sep '14

Hi, I am trying to figure out how to do p2v and v2v migrations on a Centos 7 kvm host. With previous versions there was virt-p2v but that does not seem to exist with Centos-7. I realize that if I am using shared storage, I can do live migrations but that does not help with p2v migrations. Does anyone know what the recommended procedure is for migrating either physical or virtual machines to Centos-7 is? I have tried searching for the answer but my google foo is not being helpful. Regards, -- Tom me(a)tdiehl.org Spamtrap address me123(a)tdiehl.org

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clipboard
by ToddAndMargo 16 Sep '14

16 Sep '14

Hi All, How do you enable copy and paste from a Windows VM to the host Linux machine? Many thanks, -T

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What are these directories on virtio-win-0.1-81.iso?
by ToddAndMargo 16 Sep '14

16 Sep '14

Hi All I just downloaded virtio-win-0.1-81.iso from http://www.linux-kvm.org/page/WindowsGuestDrivers/Download_Drivers Looking through the ISO, I find two directories: WLH and WNET. What are they? Also, I find a WXP and and XP directory. Why two of them? Many thanks, -T

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what is vport0p1 ?
by ToddAndMargo 13 Sep '14

13 Sep '14

Hi All, In my Windows 7 Pro 64 bit KVM virtual machine, I have a hidden device driver called "vport0p1". What driver goes with this? Many thanks, -T

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Reminder: Phone meeting today
by George Dunlap 10 Sep '14

10 Sep '14

Just a reminder to everyone that we're having our bi-weekly Virt Sig meeting today at 2pm., and it's a dial-in this week. Please e-mail me if you need the dial-in information -George

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