virt August 2013

virt@lists.centos.org

24 participants
13 discussions

Where are snapshots stored??
by C. L. Martinez 02 Sep '13

02 Sep '13

HI all, I have created a snapshot for a kvm guest but only for one of disks assigned to it: qemu-img snapshot -c osvol_base /vmachines/vmtst/osvol.img and qemu-img snapshot shows me: Snapshot list: ID TAG VM SIZE DATE VM CLOCK 1 osvol_base 0 2013-08-29 11:37:23 00:00:00.000 It seems ok, but where is this snapshot stored?? I didn't find it ...

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Free Mem
by Deron 30 Aug '13

30 Aug '13

Hello, I am not sure if this is the correct Mailing list for the issue I have. I have a new system with 18GB of Physical memory on the system. I loaded CentOS 6.4. But when I boot into Dom0, I only see (xm info) 2GB of total memory? I set 1GB for Dom0, but I am not sure why the hypervisor does not see all the memory. [root@barbaro images]# xm info host : <host>.<domain> release : 3.4.54-8.el6.centos.alt.x86_64 version : #1 SMP Tue Jul 23 17:29:30 UTC 2013 machine : x86_64 nr_cpus : 4 nr_nodes : 1 cores_per_socket : 4 threads_per_core : 1 cpu_mhz : 2133 hw_caps : bfebfbff:28100800:00000000:00003b40:009ce3bd:00000000:00000001:00000000 virt_caps : hvm total_memory : 2037 free_memory : 988 free_cpus : 0 xen_major : 4 xen_minor : 2 xen_extra : .2-23.el6 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_scheduler : credit xen_pagesize : 4096 platform_params : virt_start=0xffff800000000000 xen_changeset : unavailable xen_commandline : dom0_mem=1024M,max:1024M loglvl=all guest_loglvl=all cc_compiler : gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-3) cc_compile_by : mockbuild cc_compile_domain : centos.org cc_compile_date : Thu Jul 18 13:42:23 UTC 2013 xend_config_format : 4 Thanks. If you have any suggestions that would be great. Deron

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Question about DomU in the 3.4 kernel
by Will Public 27 Aug '13

27 Aug '13

Hi all, I am trying to straighten a few things out in my mind. I understand with xen 4, and the current kernel in xen4centos, it has dom0 support now so you can install the tool stack in Centos 6.4. However, can I still use this kernel in a CentOS 6.4 guest and get DomU support and be full PV? I.E getting away from HVM and PV-HVM is my goal. Thanks!

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Installing using kernel-3.4.54 from xen4centos
by Nuno Fernandes 21 Aug '13

21 Aug '13

Hello, I've used pungi with the following configuration: repo --name=centos-base --baseurl=ftp://mirrors/centos/6/os/x86_64 --cost=1 -- excludepkgs=qemu-kvm repo --name=centos-updates --baseurl=ftp://mirrors/centos/6/updates/x86_64 -- cost=1 --excludepkgs=qemu-kvm repo --name=xen4centos -- baseurl=http://mirror.centos.org/centos/6/xen4/x86_64/ --cost=1 %packages @base @core @system-admin-tools anaconda # some default stuff that we don't want -pm-utils # to avoid HAL etc. -kexec-tools # to avoid failing kdump init script %end to create an ISO to install centos+xen from start. The 3.4 kernel gets included fine in the cdrom. When i try to install the ISO it freezes after anaconda starts graphical mode. I can't move the mouse, change to other VT, etc. If i install it using text mode or vnc mode it works fine. If i try the graphical safe mode (VESA) it also freezes. If i ommit the centos xen repository graphical installation works fine. I think that is a kernel related issue. Maybe some kernel build option? Does anyone have any ideas? Did someone tried this build? Thanks, Nuno Fernandes

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Multiple Questions: Xen4CentOS
by Duffy, Sean W 19 Aug '13

19 Aug '13

Hi, Trying to get a handle on the 'not included' aspects of Xen4CentOS. Anyone care to share their experiences with xm vs virtinstall vs virt-manage. Currently I'm running one xm create config to launch a CentOS cd based kickstart install, then I use a second xm create config to run the created systems. Thoughts on pvgrub and running unmodified kernels from within the pv guest. Is there a set of modifications that need to be run in the guest system to work reliably? Best practices for using encrypted lv's vs img files. Clone vs backup, performance issues etc. Thanks, Sean "Every good work of software starts by scratching a developer's personal itch." -- Eric Raymond The information in this e-mail may be privileged and confidential, intended only for the use of the addressee(s) above. Any unauthorized use or disclosure of this information is prohibited. If you have received this e-mail by mistake, please delete it and immediately contact the sender.

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Xen4CentOS6 project longevity
by gregg anderson 16 Aug '13

16 Aug '13

We've been using CentOS 5 with Xen on our machines for a while now and have really grown to appreciate it. The lack of Xen for Centos 6 is the reason we haven't upgraded yet, but with Xen4CentOS6 we have all the tools we need. The concern some of are having is that when CentOS7 comes out, which will be probably less than a year, is that Xen support for CentOS6 will evaporate. I know this mailing list isn't where I should go for guaranties but are there any indicators that this project is going to stick around or not?

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Support cloud-init or use-data in AWS marketplace official AMI?
by ERICJ 16 Aug '13

16 Aug '13

Hi All, It's very helpful that CentOS release official AMIs in AWS EC2 marketplace. However, compare to official RedHat Linux and Amazon Linux AMIs in EC2, current official CentOS AMIs in marketplace does not support cloud-init or user-data scripts. which means that these AMIs doesn't support automation and dev-op operations. Since AWS CloudFormation also leverage user-data for initial the CloudFormation helper scripts to achieve auto deployment. I believe it would be a great enhancement to support user-data or cloud-init, so that the official CentOS can collaborate with AWS CloudFormation Service. May I know is there any planned schedule to support cloud-init or user-data scripts in CentOS official AMI? Regards,

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XenforCentOS6...need help to setup a PCI passthrough network
by Kartik Mahajan 09 Aug '13

09 Aug '13

Hi, I have used this http://wiki.centos.org/HowTos/Xen/Xen4QuickStart and everything works like a charm then I installed a VM using http://wiki.centos.org/HowTos/Xen/Xen4QuickStart/Xen4Libvirt only to realize later that I don't want NAT. I would want to use PCI passthrough and so i used virsh net-destroy default virsh net-undefine default and net-create /home/kartik/passthrough.xml net-autostart passthrough net-start passthrough here is the output of /etc/libvirt/qemu/networks/passthrough.xml  <network> <name>passthrough</name> <uuid>d947fa14-af51-c615-279c-5d56ced04e44</uuid> <forward mode='hostdev' managed='yes'> <pf dev='eth0'/> </forward> </network> Is my approach right? After this I tried to restart using s shutdown -r now( but the machine is not rebooting) Welcome to virsh, the virtualization interactive terminal. Type: 'help' for help with commands 'quit' to quit virsh # virsh # virsh # list --all error: Failed to reconnect to the hypervisor error: no valid connection error: unable to connect to 'localhost:8000': Connection refused Can anyone help? Regards kartik

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messages logs flooded with xen_balloon: reserve_additional_memory: add_memory() failed
by Shaun Reitan 08 Aug '13

08 Aug '13

My /var/log/messages log is being flooded with kernel messages showing the following messages Aug 1 11:22:52 host43 kernel: System RAM resource 48000000 - 4fffffff cannot be added Aug 1 11:22:52 host43 kernel: xen_balloon: reserve_additional_memory: add_memory() failed: –17 Doing a search I found a thread from xen-devel that talks a bit about it. I’m not sure if this is related to the same issue or if that issue was ever fixed. When I cat current_kb and target_kb the values don’t match, they are just barely off. I have not tried setting them to match yet. http://marc.info/?t=135601508900004&r=1&w=3 [root@host ~]# cat /sys/devices/system/xen_memory/xen_memory0/info/current_kb 1048532 [root@host ~]# cat /sys/devices/system/xen_memory/xen_memory0/target_kb 1048576 Any ideas? -- Shaun Reitan

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Qcow files
by mattias 07 Aug '13

07 Aug '13

I have a qcow file It shows correct size on one server Fdisk -l w.qcow 70 GB On the other server Fdisk w.qcow 0 MB stupid

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safety of LVM backups
by Rajagopal Swaminathan 06 Aug '13

06 Aug '13

Greetings, Can anybody confirm the safety of LVM snapshot backout (not a backup -- but similar to snapshot restore) for a VM? I understand that there is a step for restart of the CM and not live migration. Will any thing of rsync will help considering a usage of DD on various VM file formnats and various *visors(s)? Or is there a suggested (best practices) way of coelsing VMs snapshots and and possibily running a particular snapshot being coelesed? -- Regards, Rajagopal

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vmdk
by mattias 06 Aug '13

06 Aug '13

i try to use a older vmdk image on kvm it seems to work on a debian kvm box but not on a centos 6 box the kvm on centos says no bootable device but on debian it boots fine

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AWS AMI questions
by CS 01 Aug '13

01 Aug '13

Hi folks, I had a few questions in regards to the CentOS AMI: Are there instance backed versions of the AWS marketplace CentOS builds? It looks like there might have been at one point, but I'm not seeing them now, and since they're marked as being from the marketplace we're having some difficulties attaching the volumes to another system to create an instance backed version of it. Any ideas? Is it possible to download the AMI from somewhere and re-upload them so they don't have the Marketplace restrictions? I checked cloud.centos.org, but it seems like they files there haven't been updated in a while. It's my understanding that projectraindrops.net was used to build the AMIs, is it possible to run that service locally? Thanks! cs

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virt August 2013