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[libvirt-users] Qemu restore error
by Dennis Householder 15 Dec '11

15 Dec '11

Hello, I'm not sure if I am having a kvm/qemu issue, a virt-manager issue, or a libvirt issue, so if I am asking the wrong crowd please let me know! In short, restoring some suspended kvm guests via virt-manager is failing because libvirt cannot read the qemu header. I cannot find any documentation on what this means. From virsh's limited documentation I was able to gather that there is probably something wrong with an xml file somewhere, but I cannot find it. Any advice is greatly appreciated! Synopsis: I have 5 KVM guests on a Fedora 16 laptop host. I manage them locally through virt-manager. These guests are JUNOS 10.1R1 (installed over FreeBSD 4.1 mini-inst) on a patched bios (SeaBIOS pre-0.6.1-20100805_064324-Compaq8510w). One time I suspended my laptop and the kvm domains were suspended as well. Trying to restore yields the following error: Error restoring domain: operation failed: failed to read qemu header 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 1050, in startup self._backend.create() File "/usr/lib64/python2.7/site-packages/libvirt.py", line 510, in create if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self) libvirtError: operation failed: failed to read qemu header #end error output Package version info: libvirt-python-0.9.6-2.fc16.x86_64 libvirt-0.9.6-2.fc16.x86_64 libvirt-client-0.9.6-2.fc16.x86_64 gpxe-roms-qemu-1.0.1-4.fc16.noarch qemu-system-x86-0.15.1-3.fc16.x86_64 qemu-common-0.15.1-3.fc16.x86_64 qemu-kvm-0.15.1-3.fc16.x86_64 qemu-img-0.15.1-3.fc16.x86_64 virt-manager-0.9.0-7.fc16.noarch virt-manager-common-0.9.0-7.fc16.noarch virt-viewer-0.4.1-3.fc16.x86_64 Again, any advice is appreciated. I hope I have provided enough info. Thank you for your time! -- Dennis CONFIDENTIALITY NOTICE: The information contained in this message may be privileged and/or confidential. If you are not the intended recipient, or responsible for delivering this message to the intended recipient, any review, forwarding, dissemination, distribution or copying of this communication or any attachment(s) is strictly prohibited. If you have received this message in error, please notify the sender immediately, and delete it and all attachments from your computer and network.

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[libvirt-users] Adding a public static IP address to the guest
by Sudheer Satyanarayana 14 Dec '11

14 Dec '11

Hello, The host runs on CentOS 6. I have installed a guest, CentOS 5.7, using libvirt. I am having difficulty understanding how to assign a public static IP address to the guest. From what I understand by reading the Wiki, I think I require routed mode. The ISP has provided a 'portable' IP routed to the VLAN of our servers. I want to assign this IP address to the guest. From the virtual machine hardware details window, I see that "Virtual network 'default' : NAT" is selected for the source device field. Can someone offer a helping hand and instruct and educate me on how to proceed from here? Thanks. -- With warm regards, Sudheer. S

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[libvirt-users] acceptable SASL mechanisms/can libvirt authenticate against PAM
by Dave Allan 14 Dec '11

14 Dec '11

I was playing with SASL authentication a bit today and I wasn't able to get libvirt to authenticate against PAM (or anything else except the sasldb, although I didn't try Kerberos). Does anybody know off the top of their head what mechanisms/password check options work? I'm trying to figure out if I'm attempting the impossible. Dave

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[libvirt-users] Temporary use of disk space when deploying KVM with qcow2 ?
by Jorge Somavilla 14 Dec '11

14 Dec '11

Hello, I'm using libvirt to deploy a series of 7 KVM (in qcow2 format) sequentially. The base image of the qcow2 is an ubuntu server of around 1.6GB. The environment where i am doing this is a Live USB Ubuntu with a persistence file (so that changes made remain). So, the problem: * If the persistence file (i.e. free disk space in the live ubuntu) is up to around 1.6GB, the qemu process of launching the first one of the KVM gets stuck, and a few seconds later an Ubuntu message pops up saying there is no disk space left. * If the persistence file is a bit bigger (100 MB more), it can launch the 7 KVM machines without any disk space problems. This would suggest that during the deployment of one virtual machine, there is a short period of time where a big amount of disk space (similar to the size of the base image) is used (even if i am using qcow2 vms) and afterwards released, so it can be used to launch the second vm, released, used for the third, and so on. If this is correct, i would like to know who is using that space, since my intention would be to, if possible, redirect this temporary disk usage to a RAM filesystem such as tmpfs, so that i don't need such a huge persistence file in the USB. I'm aware that this might be related to qemu-kvm rather than to libvirtitself, but i can't find information about it and i would appreciate if anyone could point me in the right direction. More details or clarification can be provided if needed. Best regards, Jorge

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Re: [libvirt-users] acceptable SASL mechanisms/can libvirt authenticate against PAM
by Josip Deanovic 14 Dec '11

14 Dec '11

On Wednesday 2011-12-14, Josip Deanovic wrote: > On Wednesday 2011-12-14, Dave Allan wrote: > > I was playing with SASL authentication a bit today and I wasn't able > > to get libvirt to authenticate against PAM (or anything else except > > the sasldb, although I didn't try Kerberos). Does anybody know off > > the top of their head what mechanisms/password check options work? > > I'm trying to figure out if I'm attempting the impossible. > > > > Dave > > Hi Dave, > > Here is my working configuration with sql backend. I am using postgres. > > mech_list: digest-md5 > pwcheck_method: auxprop > auxprop_plugin: sql > sql_engine: pgsql > sql_hostnames: localhost > sql_user: qemukvm > sql_passwd: secret > sql_database: qemukvmdb > sql_select: select password from qemuusers where username = '%u' > > > To make use of PAM as far as I know you will have to use saslauthd > method. > > And here is the list of relevant sasl options (I am not sure if it's up > to date): http://asyd.net/docs/cyrus-options.html Sorry, I was mistakenly referring to sasl authentication for vnc client with sasl support. However, this configuration might work with libvit with little or no modifications. However I never tried to authenticate to libvrit using sasl. -- Josip Deanovic

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[libvirt-users] Why does libvirt use XML firewall rules?
by Hansa 14 Dec '11

14 Dec '11

Hi there, When creating a VM with a persistent virtual network, libvirt creates an XML file with firewall definitions and stores it in /etc/libvirt/<hypervisor>/networks/. The XML file is (to my knowledge) incompatible with iptables-restore. Therefore you cant manage your firewall with other iptables (GUI) tools unless libvirt lets you a) import extra rules, b) has an option to export the XML rules into iptables-save format or c) something else. If a) , b) or c) is possible then this discussion is of course useless and I would be pleased to know how its done :) If not, then lets get the discussion started. IMHO, saving rules into XML instead of using iptables-save is absurd since youll have to code stuff which is already coded. Also youll make it incompatible with the tools which are readily available. Why go for this approach and what do we get from it? Best regards, -Hansa

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[libvirt-users] Libvirt filterref magic
by zz elle 14 Dec '11

14 Dec '11

Hi everyone, When i start a libvirt domain (on KVM) with network filtering (using filterref clean-traffic for example), the filter works ! But ... i don't understand how/why it works :( Indeed when i look at ebtables -L iptables-save & arptables-save (and KVM command), I see no filtering rules (which is surprising because clean-traffic requires at least ebtables to be installed). Is it normal ? Do i miss some xxtables administration command to see them ? What appends if i do a arptables-restore, iptables-restore after the vm startup ? Does it remove network filtering rules from xxtables ? No impact ? Thx by advance for your help ZZ, what is the magic behind my questioning ?

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[libvirt-users] libvirt0.9.7.tar.gz installation cannot start libvirtd?
by 张光鹏 13 Dec '11

13 Dec '11

Hi： I have a host Redhat6.1 ，when i install os the libvirt0.8.7 were contained . Latter i installed libvirt0.9.3.tar.gz without uninstall the libvirt0.8.7, i just use the virsh functions. Now i want to install libvirt0.9.7.tar.gz , and i uninstall libvirt0.9.3 and uninstall libvirt0.8.7 with "rpm -e" , i also delete some files contains vesion number 0.8.7 or o.9.3. Today i install libvirt 0.9.7 , untar and install wit "./configure --prefix-/usr/local/libvirt --with-esx", then " make" "make install" ,and i make a link "ln -s /usr/local/libvirt/bin/virsh /usr/bin/virsh" , so i can use virsh . But i cannot start libvirtd ,when i use "service libvirtd start/status.." ,it returns "libvirtd:unrecognized service". I found a libvirtd file in /usr/sbin/. Could someone help to resolve the problem ? Thanks all Best regards --------------------------------------------------------------------------------------------------- Confidentiality Notice: The information contained in this e-mail and any accompanying attachment(s) is intended only for the use of the intended recipient and may be confidential and/or privileged of Neusoft Corporation, its subsidiaries and/or its affiliates. If any reader of this communication is not the intended recipient, unauthorized use, forwarding, printing, storing, disclosure or copying is strictly prohibited, and may be unlawful.If you have received this communication in error,please immediately notify the sender by return e-mail, and delete the original message and all copies from your system. Thank you. ---------------------------------------------------------------------------------------------------

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[libvirt-users] Temporary use of disk space when deploying KVM with qcow2?
by Jorge 13 Dec '11

13 Dec '11

Hello, I'm using libvirt to deploy a series of 7 KVM (in qcow2 format) sequentially. The base image of the qcow2 is an ubuntu server. The environment where i am doing this is a Live USB Ubuntu with a persistence file (so that changes made remain). So, my problem: * If the persistence file (i.e. free disk space in the live ubuntu) is up to around 1.5GB, the qemu process of launching the first one of the KVM gets stuck, and a few seconds later an Ubuntu message pops up saying there is no disk space left. * If the persistence file is a bit bigger (100 MB more), it can launch the 7 KVM machines without any disk space problems. This would suggest that during the deployment of one virtual machine, there is a short period of time where a big amount of disk space (similar to the size of the base image) is used (even if i am using qcow2 vms) and afterwards released, so it can be used to launch the second vm, released, used for the third, and so on. If this is correct, i would like to know who is using that space, since my intention would be to, if possible, redirect this temporary disk usage to a RAM filesystem such as tmpfs, so that i don't need such a huge persistence file in the USB. I'm aware that this might be related to qemu-kvm rather than to libvirt itself, but i can't find information about it and i would appreciate if anyone could point me in the right direction. More details or clarification can be provided if needed. Best regards, Jorge

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[libvirt-users] Issues with nwfilter rules
by Kevin 10 Dec '11

10 Dec '11

Hi All, I have two kvm guests running with a bridged configuration bound separately to br0 and br1 on my Fedora 15 host. I'm attempting to create some nwfilter rules on br1 and am running into a bunch of problems that have me scratching my head. libvirt version: 0.8.8-7 What I've noticed on the second host is as follows: - Most all nwfilter rules that I create for the host on br1 don't work as I would expect. If I create a rule for TCP dest port 22 with direction set to 'in', I would expect I could connect to the host via SSH from another host, but I only see a SYN and not a full connection. If I set the direction to 'inout', SSH seems to work. - A nwfilter rule for UDP dest port 53 with direction set to 'out' or 'inout' doesn't allow lookups to an outside DNS server. - In the configuration of one VM, the source Virtual network device lists "Host device vnet0 (Bridge 'br0') and the other lists "Host device eth1 (Bridge 'br1')". I don't see anything different in the two hosts XML configuration files that describe the difference, but I'm concerned that the second VM on br1 is misconfigured. I notice a few iptables rules with "PHYSDEV match --physdev-in vnet1" listed in them, should these really read "PHYSDEV match --physdev-in br1" given the configuration virt-manager is reporting? I would appreciate any pointers. -Kevin

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