June 2011 - Users - libvirt List Archives

[libvirt-users] converting save/dump output into physical memory image
by Andrew Tappert 05 Jun '12

05 Jun '12

A lot of people in the security community, myself included, are interested in memory forensics these days. Virtualization is a natural fit with memory forensics because it allows one to get access to a guest's memory without having to introduce any extra software into the guest or otherwise interfere with it. Incident responders are particularly interested in getting memory dumps from systems they're investigating. Virsh has "save" and "dump" commands for storing the state of a guest to a file on disk, but memory of KVM guests doesn't get saved in the "standard" input format for memory forensics tools, which is a raw physical memory image. (This is what you'd get via the classical "dd /dev/mem" approach or the contemporary equivalent using the crash driver; and VMware Server and Workstation produce .vmem files, which are such raw physical memory images, when a guest is paused or snapshotted.) In order to analyze the memory of Libvirt/KVM guests with my Linux memory forensics software, Second Look, I've created a tool for converting Libvirt-QEMU-save files (output of virsh save command) or QEMU-savevm files (output of virsh dump command) to raw physical memory images. I've got a basic working capability, though I'm still tracking down some problems with a guest allocated 8GB RAM--not all the memory seems to be present in the save or dump file. And I haven't tested very extensively yet, version support is limited to what I myself am currently running, etc. I'd like to know if this is a capability that others are interested in. Is this something that would be of interest to the Libvirt project if I were to contribute the code, or to the KVM project, or do you think it best exists as a separate project? I've also got a proof-of-concept tool for converting hibernate images to raw physical memory images. Perhaps a collection of tools for converting various memory dump formats would be a good project. Anyone else interested in this kind of stuff? As an author of commercial memory forensics software I've got a vested interest in availability of good memory acquisition capabilities. But there are a number of people working on FOSS Linux memory analysis tools, too... Andrew

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[libvirt-users] small webGUI?
by Stefan G. Weichinger 28 Jul '11

28 Jul '11

Greetings, at a customer we run a single VM for a specific application. Unfortunately this VM does not start automatically with the host although I checked the relevant box within virtual machine manager. I assume upgrading libvirt might help (we run 0.8.7-r1 right now, gentoo linux). Aside from that it would be good to have a simple WebGUI for the users to let them press START just in case. They run Windows on their machines so I can't give them VMM ... Could you point me at the most simple GUI to do that? I'd prefer something very lightweight without too much requirements (for example I'd like to avoid installing mysql for that ;-) ). Thank you, Stefan

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[libvirt-users] Is libvirt supported on Citrix Xenserver?
by G Naresh Kumar 21 Jul '11

21 Jul '11

Hi, Is libvirt supported on Citrix Xenserver. I have been searching for the same with little/no luck. If supported, can you point to some links/documents which can help me try out the same. Thanks, Naresh

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[libvirt-users] Compatibility with Parallels Virtouzo
by Andreas Mauf 12 Jul '11

12 Jul '11

Hi, will libvirt work with the commercial parallels virtuozzo, too? Cause the linux version of virtuozzo is based on openvz, which ist supported by libvirt. Does someone have some experencies with that? Thanks for any feedback, Andreas -- SysEleven GmbH Rosenthaler Str. 34/35 10178 Berlin Firmensitz: Berlin Registergericht: AG Berlin Charlottenburg, HRB 108571 B Geschäftsführer: Marc Korthaus

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[libvirt-users] ANNOUNCE: oz 0.5.0 release
by Chris Lalancette 01 Jul '11

01 Jul '11

All, I'm pleased to announce release 0.5.0 of Oz. Oz is a program for doing automated installation of guest operating systems with limited input from the user. Release 0.5.0 is a bugfix and feature release for Oz. Some of the highlights between Oz 0.4.0 and 0.5.0 are: - Replace icicle-nc binary with a shell script to try various methods. Besides being more portable, this also allows us to convert Oz to a noarch RPM (thanks to Padraig Brady) - Support for Ubuntu 6.06 - Support for md5sum/sha1sum/sha256sum checking of ISOs after download - New -x flag for oz-install to write the libvirt XML file to a user-specified location (thanks to Steve Dake) - Support for OpenSUSE customization - Support for F-15 customization (thanks to Steve Dake) - Support for running commands at the end of package installation (thanks to Steve Dake) Fedora 14 and RHEL-6 packages are available for this release. Note that to install the RHEL-6 packages, you must be running RHEL-6.1 or later. Instructions of how to get and use Oz are available at http://aeolusproject.org/oz.html If you have any questions or comments about Oz, please feel free to contact aeolus-devel(a)lists.fedorahosted.org or me (clalance(a)redhat.com) directly. -- Chris Lalancette

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[libvirt-users] vnc over ssh failing
by Pete Ashdown 30 Jun '11

30 Jun '11

I'm using virt-manager 0.8.6 client side on Ubuntu 11.04. I can't get vnc over ssh to work to a kvm guest running on a Ubuntu 10.04 host. kvmhost:~> virsh vncdisplay testing :0 kvmhost:~> telnet 127.0.0.1 5900 Trying 127.0.0.1... Connected to 127.0.0.1. Escape character is '^]'. RFB 003.008 Client virt-manager debug: 2011-06-24 11:28:56,055 (console:923): Starting connect process for proto=vnc trans=tcp connhost=192.168.1.10 connuser=pashdown connport=None gaddr=127.0.0.1 gport=5900 gsocket=None 2011-06-24 11:28:56,120 (console:810): Viewer disconnected I can reach the console with: xtightvncviewer -via 192.168.1.10 127.0.0.1:0 Any suggestions are appreciated.

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[libvirt-users] ANNOUNCE: libvirt Perl bindings Sys::Virt 0.2.8 release
by Daniel P. Berrange 30 Jun '11

30 Jun '11

I am happy to announce a new release[1] of the libvirt Perl bindings, Sys::Virt 0.2.8 is available for download: http://search.cpan.org/CPAN/authors/id/D/DA/DANBERR/Sys-Virt-0.2.8.tar.gz Changes in this release - Add all new APIs in libvirt 0.9.0 - Add examples for different ways of using stream APIs to download/upload storage volumes - Requires libvirt >= 0.9.0 The permanent link for the Sys::Virt package, where all historic releases can be found, is http://search.cpan.org/dist/Sys-Virt/ Thanks to everyone who contributed to this release through testing, bug reporting, patch submission, etc Regards, Daniel [1] Yes, 2 releases in 2 days. I'm playing catchup with main libvirt releases and instead of going straight to latest one (0.9.2), I'm releasing Perl bindings for the 2 intermediate releases since those are needed in various distros. Guess what to expect tomorrow.... -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|

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[libvirt-users] ANNOUNCE: libvirt Perl bindings Sys::Virt 0.2.7 release
by Daniel P. Berrange 29 Jun '11

29 Jun '11

I am happy to announce a new release of the libvirt Perl bindings, Sys::Virt 0.2.7 is available for download: http://search.cpan.org/CPAN/authors/id/D/DA/DANBERR/Sys-Virt-0.2.7.tar.gz Changes in this release - Honour flags parameter when dumping XML - Use thread local error APIs exclusively - Fix bogus extra URI parameter in migrate_to_uri function - Implement all virStream APIs in Sys::Virt::Stream - Impement virDomainGetSysinfo binding - Call virInitialize when loading module - Add all missing error constants - Update example RPM spec to match Fedora - Requires libvirt >= 0.8.8 The permanent link for the Sys::Virt package, where all historic releases can be found, is http://search.cpan.org/dist/Sys-Virt/ Thanks to everyone who contributed to this release through testing, bug reporting, patch submission, etc Regards, Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|

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[libvirt-users] Starting libvirtd cuts off host access to external network
by PLD 24 Jun '11

24 Jun '11

I've spent some hours on this without success - any help greatly appreciated. I've just done a new RHEL6 setup, with a KVM guest (first time). The basic installation works fine until I start libvirtd; at this point, the host machine loses access to the external network: step 1: ping from host to network works; external machine on network can ping both eth0 and br1 on the host step 2: /sbin/service libvirtd start step 3: ping from host to network fails; external machine on the network can't ping either eth0 or br1 on the host Stopping libvirtd (/sbin/service libvirtd stop) makes no difference - the network remains unreachable. Any idea why this would happen? I have installed a kvm guest, using the default network script at /etc/libvirtd/qemu/networks/default.xml (although I've changed the IP addresses to be on my subnet, and the DHCP server returns only one address). I have also configured a bridge; I've attached ifcfg-eth0, ifcfg-eth1, and ifcfg-br1 below. I haven't changed any iptables configuration. If I run the guest (also RHEL6) the guest can talk to the host, but it can't see the outside world. Thanks - Paul ================================================ ifcfg-eth0: ----------- NM_CONTROLLED="no" DEVICE="eth0" HWADDR=00:16:E6:8A:C7:20 ONBOOT=yes TYPE=Ethernet DEFROUTE=yes IPV4_FAILURE_FATAL=yes IPV6INIT=no NAME="System eth0" NETMASK=255.255.255.0 BOOTPROTO=dhcp ifcfg-eth1: ----------- NM_CONTROLLED="no" DEVICE="eth1" HWADDR=00:16:E6:8A:C7:21 ONBOOT=yes TYPE=Ethernet DEFROUTE=yes IPV4_FAILURE_FATAL=yes IPV6INIT=no NAME="System eth1" BRIDGE=br1 NETMASK=255.255.255.0 ifcfg-br1: ---------- NM_CONTROLLED="no" DEVICE=br1 BOOTPROTO=dhcp ONBOOT=yes TYPE=Bridge DELAY=0

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Re: [libvirt-users] libvirt-users Digest, Vol 18, Issue 17
by m m 20 Jun '11

20 Jun '11

Yes, I also think that iptables module should be loaded before libvirt-bin and I have seen a post which regarded loading conntrack modules and these modules also seem to be necessary... I know a little about Upstart in Ubuntu. However, I still don't know how to properly solve this problem. ip_tables module depend on other modules being loaded and since I don't know the full list of modules which should be loaded (for IP tables to work) I don't know how to handle that. Besides, even if I had this list, it could change for some time, so it is not a good idea to rely on that. Version which I have installed is the newest release from Ubuntu repositories. Thank you for help. I will be grateful for any further suggestions. 2011/6/13 <libvirt-users-request(a)redhat.com> > Send libvirt-users mailing list submissions to > libvirt-users(a)redhat.com > > To subscribe or unsubscribe via the World Wide Web, visit > https://www.redhat.com/mailman/listinfo/libvirt-users > or, via email, send a message with subject or body 'help' to > libvirt-users-request(a)redhat.com > > You can reach the person managing the list at > libvirt-users-owner(a)redhat.com > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of libvirt-users digest..." > > > Today's Topics: > > 1. Re: libvirt-bin MOSTLY fails to create default virtual > network (Laine Stump) > 2. Boot delay (Jeff) > 3. e: How to disconnect the ISO image using virsh (Jeff) > 4. Difference between function Migrate and Migrate2 (Abhishek Gupta) > 5. Re: Boot delay (Michal Privoznik) > 6. hook scripts - not in Ubuntu packages? (Whit Blauvelt) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sun, 12 Jun 2011 12:03:17 -0400 > From: Laine Stump <laine(a)laine.org> > To: libvirt-users(a)redhat.com > Subject: Re: [libvirt-users] libvirt-bin MOSTLY fails to create > default virtual network > Message-ID: <4DF4E345.7060104(a)laine.org> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > On 06/06/2011 03:24 PM, m m wrote: > > I have observed 3 scenarios after I reboot the host with 2 guests > > (which are supposed to autostart after boot/reboot of the host): > > 1. Default network is created but I can not ping guests. Gests don't > > have assigned IP address or they both have IP address 192.168.122.100. > > 2. Default network is not created. > > 3. Default netork is properly created and everything works fine. > > In each case guests are started and they work properly. Cases 1. and > > 2. happen a lot more often then case 3. > > > > My solutions: > > - When I restart libvirt-bin then everything is fine. > > - When I set 'sleep 40' in 'pre-start' section of > > /etc/init/libvirt-bin.conf and modify 'start on' section in the > > following way: > > > > start on (runlevel [2345] and net-device-up IFACE=br0) > > > > then everything works fine. > > > > > > However, none of the above solutions indeed solves the problem. > > Please, let me know if there is solution to this problem or what are > > your suggestions regarding this issue. > > > > **** > > HOST$ uname -a > > Linux ras 2.6.32-32-server #62-Ubuntu SMP Wed Apr 20 22:07:43 UTC 2011 > > x86_64 GNU/Linux > > > > GUEST1 and GUEST2 > > $ uname -a > > Linux server1-desktop 2.6.32-32-generic #62-Ubuntu SMP Wed Apr 20 > > 21:54:21 UTC 2011 i686 GNU/Linux > > > > HOST$ libvirtd --version > > libvirtd (libvirt) 0.7.5 > > > > My idea was that some kernel modules sometimes are loaded before > > libvirt-bin starts, and sometimes libvirt-bin starts earlier, or in > > the middle of loading of these modules, that is why 3 scenarios can be > > observed. > > That is why I have added: > > cp /proc/modules /home/wsadmin2/modules1 > > cp /proc/modules /home/wsadmin2/modules2 > > to 'pre-start' and 'post-start' parts respectively of > > /etc/init/libvirt-bin.conf. > > > > Of course, beween execution of > > - pre-start part > > - exec /usr/sbin/libvirtd -d > > - post-start part > > other kernel modules can be loaded, so we can not be sure which > > additional modules in file 'modules2' were indeed loaded before > > libvirtd was actually started. > > > > Here are my observations: > > Scenatio 1. > > 33 (fixed) modules were logged - call them BASE MODULES. > > > > Scenatio 2. > > Beside BASE MODULES + the following modules were loaded: > > > > > iptable_filter 1841 0 - Live 0xffffffffa007c000 > > > ip_tables 18201 1 iptable_filter, Live 0xffffffffa0172000 > > > x_tables 22361 1 ip_tables, Live 0xffffffffa0164000 > > In your "scenario 1" the modules necessary for iptables to function > haven't been loaded. Each virtual network requires a set of iptables > rules to function properly, and if there is no iptables, the rules can't > be added and network creation fails. Your libvirtd.log confirms that > problem: > > 10:06:06.980: error : networkAddIptablesRules:750 : failed to add > iptables rule to allow DHCP requests from 'virbr0': Invalid argument > > > 0.7.5 is quite old (> 1 year), is there perhaps a newer pre-built > version of libvirt available for your release of Ubuntu? > > It seems that Ubuntu's method of starting up libvirtd (at least on your > machine) is missing a dependency to force iptables to be loaded before > libvirtd starts. I'm unfamiliar with Ubuntu/debian startup stuff > (upstart, I guess), but that's where you need to look for the solution. > > I found the following in the ubuntu bug database, which seems similar, > but not identical (basically the system networking isn't completely > ready by the time the autostart domains are brought up): > > https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/495394 > > > > > Scenatio 3. > > Beside BASE MODULES + the following modules were loaded: > > > > $ diff modules1 modules2 > > 1c1,6 > > < iptable_filter 1841 0 - Live 0xffffffffa008b000 > > --- > > > xt_state 1490 14 - Live 0xffffffffa01ab000 > > > xt_tcpudp 2667 12 - Live 0xffffffffa01a5000 > > > nf_conntrack_ipv4 12742 14 - Live 0xffffffffa019b000 > > > nf_conntrack 73326 2 xt_state,nf_conntrack_ipv4, Live > 0xffffffffa017d000 > > conntrack is used by iptables. I haven't tried it, but wouldn't be > surprised if adding rules that required conntrack failed if it hadn't > been loaded, or something like that. > > > > nf_defrag_ipv4 1481 1 nf_conntrack_ipv4, Live 0xffffffffa0177000 > > > iptable_filter 1841 1 - Live 0xffffffffa008b000 > > 3c8 > > < x_tables 22361 1 ip_tables, Live 0xffffffffa0162000 > > --- > > > x_tables 22361 3 xt_state,xt_tcpudp,ip_tables, Live 0xffffffffa0162000 > > > > Other observations: > > Scenatio 1. > > No errors in libvirtd.log > > Scenario 2. > > > > 10:06:06.980: error : networkAddIptablesRules:750 : failed to add > > iptables rule to allow DHCP requests from 'virbr0': Invalid argument > > (...) > > 10:06:08.630: error : qemudNetworkIfaceConnect:1445 : Failed to add > > tap interface to bridge 'virbr0': No such device > > 10:06:08.630: error : qemuAutostartDomain:584 : Failed to autostart VM > > 'cluster_server1': Failed to add tap interface to bridge 'virbr0': No > > such device > > > > 10:06:08.921: info : qemudDispatchSignalEvent:390 : Received > > unexpected signal 17 > > 10:06:08.927: debug : virExecWithHook:617 : LC_ALL=C /usr/bin/kvm -help > > 10:06:08.938: info : qemudDispatchSignalEvent:390 : Received > > unexpected signal 17 > > 10:06:09.000: error : qemudNetworkIfaceConnect:1445 : Failed to add > > tap interface to bridge 'virbr0': No such device > > 10:06:09.000: error : qemuAutostartDomain:584 : Failed to autostart VM > > 'cluster_server2': Failed to add tap interface to bridge 'virbr0': No > > such device > > (...) > > Scenatio 3. > > No errors in libvirtd.log > > > > > > I didn't see any valuable logs in /var/log/boot.log, > > /var/log/messages, /var/log/syslog. Please let me know if you want to > > see them anyway or have any suggestions right away. > > > > > > _______________________________________________ > > libvirt-users mailing list > > libvirt-users(a)redhat.com > > https://www.redhat.com/mailman/listinfo/libvirt-users > > > > ------------------------------ > > Message: 2 > Date: Mon, 13 Jun 2011 08:25:00 -0500 > From: Jeff <jwk1230(a)gmail.com> > To: libvirt-users(a)redhat.com > Subject: [libvirt-users] Boot delay > Message-ID: <4609858C-FB73-4E8A-B81B-3EDCBB83B755(a)gmail.com> > Content-Type: text/plain; charset=us-ascii > > Is there a method of tweaking the boot sequence of a KVM instance so that > you can delay the process for X number of seconds? I don't have enough time > between starting the KVM and connecting via VNC. > > Thanks > > Jeff > > > > ------------------------------ > > Message: 3 > Date: Fri, 10 Jun 2011 15:12:36 -0500 > From: Jeff <jwk1230(a)gmail.com> > To: Osier Yang <jyang(a)redhat.com>, libvirt-users(a)redhat.com > Subject: [libvirt-users] e: How to disconnect the ISO image using > virsh > Message-ID: <F301FBCE-65F1-411A-980E-EF8B6A46241B(a)gmail.com> > Content-Type: text/plain; charset="utf-8" > > I am trying to detach an ISO from a KVM machine and I've tried both > attach-disk using " " in the file path as well as the update-device option > but am getting this error > > error: Failed to update device from /var/run/libvirt/qemu/kvmtest1.xml > error: XML description for unknown device type is not well formed or > invalid. > > I tried doing a virsh edit on the xml file to remove the source file path > to the ISO, as I assume is the correct method, and then running the virsh > update-device but it's not working. > > Can anyone advise the correct steps to detach a device from a running > and/or offline domain? > > Additionally - anyone have any guidance on how to attach a CD device to a > domain that is currently shutdown, for example, if I wanted to boot the > domain to a rescue CD image? > > Thanks > > Jeff > > > ? 2011?03?31? 15:17, Masanari Iida ??: > Somebody sent me a tips. > Following command do what I wanted to do. > Thanks. > > attach-disk guest01 " " hdc --driver file --type cdrom > --mode readonly > Also using "update-device" with an xml which doesn't specify > the source file path will work. > > On Thu, Mar 31, 2011 at 3:29 PM, Masanari Iida<standby24x7 gmail com> > wrote: > Hello, > > I can attach disc ISO image to cd-rom from virsh. > And I can replace the ISO image from disc1 to disc2 using the 2nd example. > > (example) > attach-disk guest01 /root/disc1.iso hdc --driver file --type cdrom > --mode readonly > attach-disk guest01 /root/disc2.iso hdc --driver file --type cdrom > --mode readonly > > My question is, how can I disconnect the image from the cdrom drive using > virsh. > Because, if I try to detach-disk hdc, I got following errors. > > virsh # detach-disk guest01 hdc > error: Failed to detach disk > error: this function is not supported by the connection driver: > This type of device cannot be hot unplugged > > What I can do is possible from virt-manager's "Disconnect" button, > (next to source path: line) from Hardware's TAB, Disk hdc screen. > I want to do this from virsh. > > OS: RHEL5.6 > libvirt-0.8.2-15.el5_6.1 is used. > > Regards, > Masanari Iida > > _______________________________________________ > libvirt-users mailing list > libvirt-users redhat com > https://www.redhat.com/mailman/listinfo/libvirt-users > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > https://www.redhat.com/archives/libvirt-users/attachments/20110610/f4acfe4c… > > > > ------------------------------ > > Message: 4 > Date: Sat, 11 Jun 2011 06:39:46 +0530 > From: Abhishek Gupta <cs1090174(a)cse.iitd.ernet.in> > To: libvirt-users(a)redhat.com > Subject: [libvirt-users] Difference between function Migrate and > Migrate2 > Message-ID: <BANLkTinv6XiRMz=rS88A-U-b2Hz3SVTesg(a)mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1 > > I was reading the API reference for the libvirt, when I came across > the function? virDomainMigrate and virDomainMigrate2. I am unable to > find the difference between the two. Can someone please tell the > difference in the application of the two? > > -- > Abhishek > > > > ------------------------------ > > Message: 5 > Date: Mon, 13 Jun 2011 17:21:02 +0200 > From: Michal Privoznik <mprivozn(a)redhat.com> > To: Jeff <jwk1230(a)gmail.com> > Cc: libvirt-users(a)redhat.com > Subject: Re: [libvirt-users] Boot delay > Message-ID: <4DF62ADE.60209(a)redhat.com> > Content-Type: text/plain; charset=ISO-8859-1 > > On 13.06.2011 15:25, Jeff wrote: > > Is there a method of tweaking the boot sequence of a KVM instance so that > you can delay the process for X number of seconds? I don't have enough time > between starting the KVM and connecting via VNC. > > > You might consider using virt-viewer. It simply waits for domain to > boot, if it is down. > > Your other option is to create hook script: > http://libvirt.org/hooks.html > and put conditional sleep there, because libvirt just before running a > domain tries to execute qemu with some arguments (e.g. -help) to qeury > its capabilities. And you don't want your hook script to delay that. > > So you need something like this: > > if [ $2 == "start" ]; then > sleep 5 > fi > > > Thanks > > > > Jeff > > > > _______________________________________________ > > libvirt-users mailing list > > libvirt-users(a)redhat.com > > https://www.redhat.com/mailman/listinfo/libvirt-users > > Michal > > > > ------------------------------ > > Message: 6 > Date: Mon, 13 Jun 2011 11:42:44 -0400 > From: Whit Blauvelt <whit.virt(a)transpect.com> > To: libvirt-users(a)redhat.com > Subject: [libvirt-users] hook scripts - not in Ubuntu packages? > Message-ID: <20110613154244.GA28777(a)black.transpect.com> > Content-Type: text/plain; charset=us-ascii > > On Mon, Jun 13, 2011 at 05:21:02PM +0200, Michal Privoznik wrote: > > > Your other option is to create hook script: > > http://libvirt.org/hooks.html > > That looks useful. > > On several Ubuntu systems, with Ubuntu libvirt 0.8.8 and 0.8.3 packages > installed, there's no libvirt/hooks/ directory at all. Is this a directory > that can simply be created and used under libvirt, or does using this > feature on Ubuntu require custom installation? > > Thanks, > Whit > > > > ------------------------------ > > _______________________________________________ > libvirt-users mailing list > libvirt-users(a)redhat.com > https://www.redhat.com/mailman/listinfo/libvirt-users > > End of libvirt-users Digest, Vol 18, Issue 17 > ********************************************* >

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[libvirt-users] Bypass USB to Xen VM
by Lorenzo Milesi 20 Jun '11

20 Jun '11

Hi. I'm trying to bypass an USB device from the host to a paravirtualized Xen VM. I found this page: http://libvirt.org/formatdomain.html#elementsUSB which says how to bypass usb and pci devices to guests. It says that works on KVM only, but is that notice about PCI or about ALL? Anyway I tried both from virt-manager and from virsh edit domain by adding the following: <hostdev mode='subsystem' type='usb'> <source> <vendor id='0x03f0'/> <product id='0x0114'/> </source> </hostdev> but the edit is ignored, right after I save, if I do a dumpxml the "hostdev" stanza is not present. Why? Any other way to bypass? usbip? thanks

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[libvirt-users] Display port allocation
by Tom Hughes 20 Jun '11

20 Jun '11

The automatic port allocation algorithm for displays in libvirt seems to assume that it is the only thing that will be allocating ports in the normal VNC range starting at port 5900. My host is running vino to export it's display, which has bound itself to port 5900, yet libvirt is still trying to use port 5900 for both VNC and Spice displays if I leave it in auto allocation mode. I thought that this used to work in F14 but having just tried it again it looks like I may have been mistaken. Certainly it doesn't seem to work properly in F15 either with the standard libvirt or with the virt-preview one. Tom -- Tom Hughes (tom(a)compton.nu) http://compton.nu/

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Re: [libvirt-users] virsh slow on execution
by Lorenzo Milesi 18 Jun '11

18 Jun '11

> Also, when I start a VM via OCF, while guest is booting the command > virsh domstate mydom > returns "no state". This makes PaceMaker believe the resource is not > running and continuously stops and restart the machine. I've let a shell open with virsh domstate mydom active in loop, and it seems that it returns the correct state one time once very much requests! Say over 20 requests, only one or two says "idle" or "running", all the others return "no state". I'd like to know why virsh fails so many times returning correct state... thanks

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[libvirt-users] virsh slow on execution
by Lorenzo Milesi 18 Jun '11

18 Jun '11

Hi. I've set up a Debian6+Xen4+libvirt0.9 server. VMs are going to be managed by PaceMaker with VirtualDomain primitive. As found on some mailing list I've set export VIRSH_DEFAULT_CONNECT_URI="xen:///" in root's .bashrc, but when I run virsh commands, it takes up to 10s to get the result! Is this normal? At some point today I had issues connecting to libvirt, and in this case it was responding fast, less than couple of seconds. Also, when I start a VM via OCF, while guest is booting the command virsh domstate mydom returns "no state". This makes PaceMaker believe the resource is not running and continuously stops and restart the machine. How can I speed up virsh output? Thanks

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[libvirt-users] Problems migrating xen domains
by Lorenzo Milesi 18 Jun '11

18 Jun '11

Hi. I've set up a cluster with two Debian 6 nodes, running Xen 4 and libvirt 0.9 (from backports). My VMs run over a DRBD resource, to allow live migration between the nodes. I've successfully tried live migration using xm migrate, now I'd like to make it work using virsh, but cannot make it. Here's the error I'm getting: # virsh migrate efw xen+ssh://10.22.22.152/ error: POST operation failed: xend_post: error from xen daemon: (xend.err "can't connect: (-2, 'Name or service not known')") As said, xm migrate worked at first, so xend should be set up correctly. I've done several searches but with no luck. What could be the problem? thanks Relevant configs: # cat /etc/xen/xend-config.sxp |grep -v ^#|grep -v ^$ (xend-http-server yes) (xend-unix-server yes) (xend-relocation-server yes) (xend-port 8000) (xend-relocation-port 8002) (vif-script vif-bridge) (dom0-min-mem 196) (enable-dom0-ballooning yes) (total_available_memory 0) (dom0-cpus 0) (vncpasswd '') # env|grep VIRSH_DEFAULT_CONNECT_URI VIRSH_DEFAULT_CONNECT_URI=xen:/// root@xensrv01:~# virsh version Compiled against library: libvir 0.9.0 Using library: libvir 0.9.0 Using API: Xen 3.0.1 Running hypervisor: Xen 4.0.0

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[libvirt-users] basic network setup
by Jerry Worley 17 Jun '11

17 Jun '11

I am setting up a network with 2 guests, each on different subnets. The physical machine has 2 NICS, one on each subnet. I want the physical and guest machines to have IP addresses with no NAT, in their respective subnets, and then I want a separate subnet where the 2 guests can connect directly to each other. Can somebody explain conceptually the best way to use physical adapters, bridges, virtual bridges, virtual networks to accomplish this.

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[libvirt-users] Virsh Console - Changes in guest
by Abhishek Gupta 17 Jun '11

17 Jun '11

Hello Virsh Console was not working on my setup. (also it required ctrl + shift + ] instead of ctrl+alt+] for interrupt) But after I create a file /etc/init/ttyS0.conf # ttyS0 - getty # # This service maintains a getty on ttyS0 from the point the system is # started until it is shut down again. start on stopped rc RUNLEVEL=[2345] stop on runlevel [!2345] respawn exec /sbin/getty -L 38400 ttyS0 vt102 Reload libvirt-bin, and restart the vm the console starts working. Is there any other way of doing this without the need of changing the guest files and independent of guest OS? I am using libvirt version 0.8.8. -- Abhishek abhishekgupta92.info

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[libvirt-users] 2 virsh consoles on the same hypervisor causes conflicts
by David Lane 16 Jun '11

16 Jun '11

Anyone encountered this? Anyone have a solution? Seeing it in Fedora15 with KVM If 2 consoles are opened to the same guest from the hypervisor they will interfere with each other. keystrokes are lost and returned information is displayed on either virsh console instances randomly. Both consoles are rendered unusable. Thanks, DAVID

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[libvirt-users] Virtual switches support (Openvswitch, VDE,...)
by Jérémie Tarot 16 Jun '11

16 Jun '11

Hi, IIR/UC there have been a couple of discussions lately about possible evolution of libvirt's network management features to eventually support more kinds of virtual networking technologies like Openvswitch, VDE,... Could a kind and informed soul keep us on touch with progress in the field ? Thank you very much in advance PS: I wish this will be available before/for 1.0 release...

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Re: [libvirt-users] [Qemu-devel] Qcow2
by Stefan Hajnoczi 16 Jun '11

16 Jun '11

On Wed, May 18, 2011 at 5:18 PM, <arun.sasi1(a)wipro.com> wrote: > Hello Stefan, > > > > Thank you very much for considering my issue... > > > > Here is My problem... > > > > 1) I have 4 VM`s Running on Base server. > > 2) Base server is having 15GB RAM. > > 3) I can start all VM`s apart from my file server. > > 4) File server is having OS image and 1.2TB QCOW2 Image. > > 5) When I remove 1.2TB from xml file (vdb.img) I can start my server but > Data partition is null becase I have not added 1.2TB in XML. > > 6) Command I am using virsh start <Domain> > > 7) Even through virt-manager also I am not able to start the VM. Attached is > the error message Unfortunately the message gives no details: "libvirtError: internal error unable to start guest:" > 8) Keep on trying adding and removing and defining the XML after 2 Hrs I am > able to start. What did you change that made it work? > 9) Operating system Ubuntu 9.04 > > 10) I have 3 location file server having the same issue… even all file > servers are same configuration… Libvirt keeps log files for each VM under /var/log/libvirt/qemu/<domain>.log. You might find more detailed error information in that file and it will at least contain the qemu-kvm command-line used to launch the domain. Please take a look at that file and post the lines surrounding the error, especially the "starting up" log line. Have you verified that the .qcow2 image file is accessible, ownership and permissions should be the same as the image files of your other domains. Stefan > -----Original Message----- > From: Stefan Hajnoczi [mailto:stefanha@linux.vnet.ibm.com] > Sent: Wednesday, May 18, 2011 9:28 PM > To: Arun Sasi V (WI01 - Manage IT) > Subject: Re: Qcow2 > > > > On Wed, May 18, 2011 at 07:30:05PM +0530, arun.sasi1(a)wipro.com wrote: > >> The Guest VM which is larger example 1.2TB is not starting after the > >> base server reboot... Pleae help what needs to be do in this situation. > > > > You have not provided information on what is happening. Are you getting > > an error message during boot from the 1.2TB guest? Is the 1.2TB guest > > even being autostarted (use "virsh autostart <domain>" to enable > > autostart on a domain)? > > > > Please send support questions like this to qemu-devel(a)nongnu.org in the > > future. That way other people in the QEMU community can help too. > > > > Stefan > > Please do not print this email unless it is absolutely necessary. > > The information contained in this electronic message and any attachments to > this message are intended for the exclusive use of the addressee(s) and may > contain proprietary, confidential or privileged information. If you are not > the intended recipient, you should not disseminate, distribute or copy this > e-mail. Please notify the sender immediately and destroy all copies of this > message and any attachments. > > WARNING: Computer viruses can be transmitted via email. The recipient should > check this email and any attachments for the presence of viruses. The > company accepts no liability for any damage caused by any virus transmitted > by this email. > > www.wipro.com

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[libvirt-users] libvir: QEMU error : cannot set ownership
by Ali Shoker 16 Jun '11

16 Jun '11

Hello everybody, I installed eucalyptus on ubuntu10, basic configuration . Everything is ok untill I start the instances, the disk is being created but it terminates soon. Environment: NFS , KVM, ubuntu10 x64, Euca on 2 machines (wc sc cc clc on one machine, and nc on another). libvirtd (libvirt) 0.7.5 QEMU PC emulator version 0.12.3 (qemu-kvm-0.12.3), Copyright (c) 2003-2008 Fabrice Bellard. Logs: /var/log/eucalyptus/nc.log: [Thu Jun 16 03:54:31 2011][003755][EUCADEBUG ] doStartNetwork() invoked [Thu Jun 16 03:54:31 2011][003755][EUCAINFO ] StartNetwork(): SUCCESS return from vnetStartNetwork 0 [Thu Jun 16 03:54:31 2011][003755][EUCAINFO ] StartNetwork(): done [Thu Jun 16 03:54:31 2011][003755][EUCAINFO ] doRunInstance() invoked (id=i-4C9D08C3 cores=2 disk=10 memory=512) [Thu Jun 16 03:54:31 2011][003755][EUCAINFO ] image=emi-DDBD105C at http://10.1.1.2:8773/services/Walrus/image-store-1308215076/image.manifest.… [Thu Jun 16 03:54:31 2011][003755][EUCAINFO ] krnel=eki-F41F10E3 at http://10.1.1.2:8773/services/Walrus/image-store-1308215076/kernel.manifest… [Thu Jun 16 03:54:31 2011][003755][EUCAINFO ] rmdsk=eri-08841148 at http://10.1.1.2:8773/services/Walrus/image-store-1308215076/ramdisk.manifes… [Thu Jun 16 03:54:31 2011][003755][EUCAINFO ] vlan=10 priMAC=d0:0d:4C:9D:08:C3 pubMAC=d0:0d:4C:9D:08:C3 [Thu Jun 16 03:54:31 2011][003755][EUCAINFO ] network started for instance i-4C9D08C3 [Thu Jun 16 03:54:31 2011][003755][EUCAINFO ] retrieving images for instance i-4C9D08C3 (disk limit=10240MB)... [Thu Jun 16 03:54:31 2011][003755][EUCAINFO ] verifying cached file in /var/lib/eucalyptus/instances//eucalyptus/cache/eki-F41F10E3/kernel... [Thu Jun 16 03:54:31 2011][003755][EUCAINFO ] walrus_request(): downloading /tmp/walrus-digest-3D4AKY [Thu Jun 16 03:54:31 2011][003755][EUCAINFO ] from http://10.1.1.2:8773/services/Walrus/image-store-1308215076/kernel.manifest… [Thu Jun 16 03:54:31 2011][003755][EUCADEBUG ] walrus_request(): writing GET output to /tmp/walrus-digest-3D4AKY [Thu Jun 16 03:54:31 2011][003755][EUCADEBUG ] walrus_request(): wrote 3479 bytes in 3 writes [Thu Jun 16 03:54:31 2011][003755][EUCAINFO ] walrus_request(): saved image in /tmp/walrus-digest-3D4AKY [Thu Jun 16 03:54:31 2011][003755][EUCAINFO ] vrun(): [cp -a /var/lib/eucalyptus/instances//eucalyptus/cache/eki-F41F10E3/kernel /var/lib/eucalyptus/instances//admin/i-4C9D08C3/ker nel] [Thu Jun 16 03:54:31 2011][003755][EUCAINFO ] verifying cached file in /var/lib/eucalyptus/instances//eucalyptus/cache/eri-08841148/ramdisk... [Thu Jun 16 03:54:31 2011][003755][EUCAINFO ] walrus_request(): downloading /tmp/walrus-digest-sVEVa4 [Thu Jun 16 03:54:31 2011][003755][EUCAINFO ] from http://10.1.1.2:8773/services/Walrus/image-store-1308215076/ramdisk.manifes… [Thu Jun 16 03:54:31 2011][003755][EUCADEBUG ] walrus_request(): writing GET output to /tmp/walrus-digest-sVEVa4 [Thu Jun 16 03:54:31 2011][003755][EUCADEBUG ] walrus_request(): wrote 3482 bytes in 3 writes [Thu Jun 16 03:54:31 2011][003755][EUCAINFO ] walrus_request(): saved image in /tmp/walrus-digest-sVEVa4 [Thu Jun 16 03:54:31 2011][003755][EUCAINFO ] vrun(): [cp -a /var/lib/eucalyptus/instances//eucalyptus/cache/eri-08841148/ramdisk /var/lib/eucalyptus/instances//admin/i-4C9D08C3/ramdisk] [Thu Jun 16 03:54:31 2011][003755][EUCAINFO ] verifying cached file in /var/lib/eucalyptus/instances//eucalyptus/cache/emi-DDBD105C/disk... [Thu Jun 16 03:54:31 2011][003755][EUCAINFO ] walrus_request(): downloading /tmp/walrus-digest-RQEzI9 [Thu Jun 16 03:54:31 2011][003755][EUCAINFO ] from http://10.1.1.2:8773/services/Walrus/image-store-1308215076/image.manifest.… [Thu Jun 16 03:54:31 2011][003755][EUCADEBUG ] walrus_request(): writing GET output to /tmp/walrus-digest-RQEzI9 [Thu Jun 16 03:54:31 2011][003755][EUCADEBUG ] walrus_request(): wrote 5887 bytes in 5 writes [Thu Jun 16 03:54:31 2011][003755][EUCAINFO ] walrus_request(): saved image in /tmp/walrus-digest-RQEzI9 [Thu Jun 16 03:54:31 2011][003755][EUCAINFO ] vrun(): [cp -a /var/lib/eucalyptus/instances//eucalyptus/cache/emi-DDBD105C/disk /var/lib/eucalyptus/instances//admin/i-4C9D08C3/disk] [Thu Jun 16 03:54:32 2011][003755][EUCAINFO ] vrun(): [//usr/lib/eucalyptus/euca_rootwrap //usr/share/eucalyptus/partition2disk /var/lib/eucalyptus/instances//admin/i-4C9D08C3/disk 512 8280] [Thu Jun 16 03:54:37 2011][003755][EUCADEBUG ] doDescribeResource() invoked [Thu Jun 16 03:54:37 2011][003755][EUCADEBUG ] doDescribeInstances() invoked [Thu Jun 16 03:54:43 2011][003755][EUCAINFO ] preparing images for instance i-4C9D08C3... [Thu Jun 16 03:54:43 2011][003755][EUCAINFO ] adding key/tmp/sckey.uUHVTI to the root file system at /var/lib/eucalyptus/instances//admin/i-4C9D08C3/disk using (//usr/lib/eucalyptus/euca_rootwrap //usr/share/eucalyptus/add_key.pl//usr/lib/eucalyptus/euca_mountwrap) [Thu Jun 16 03:54:43 2011][003755][EUCAINFO ] vrun(): [//usr/lib/eucalyptus/euca_rootwrap //usr/share/eucalyptus/add_key.pl//usr/lib/eucalyptus/euca_mountwrap 32256 /var/lib/eucalyptus/instances//admin/i-4C9D08C3/disk /tmp/sckey.uUHVTI] [Thu Jun 16 03:54:43 2011][003755][EUCADEBUG ] system_output(): [//usr/lib/eucalyptus/euca_rootwrap //usr/share/eucalyptus/gen_kvm_libvirt_xml --ramdisk --ephemeral] [Thu Jun 16 03:54:43 2011][003755][EUCAINFO ] currently running/booting: i-4C9D08C3 [Thu Jun 16 03:54:43 2011][003755][EUCADEBUG ] doDescribeResource() invoked [Thu Jun 16 03:54:43 2011][003755][EUCADEBUG ] doDescribeInstances() invoked [Thu Jun 16 03:54:49 2011][003755][EUCADEBUG ] doDescribeResource() invoked [Thu Jun 16 03:54:49 2011][003755][EUCADEBUG ] doDescribeInstances() invoked [Thu Jun 16 03:54:55 2011][003755][EUCADEBUG ] doDescribeResource() invoked [Thu Jun 16 03:54:55 2011][003755][EUCADEBUG ] doDescribeInstances() invoked [Thu Jun 16 03:55:01 2011][003755][EUCADEBUG ] doDescribeResource() invoked [Thu Jun 16 03:55:01 2011][003755][EUCADEBUG ] doDescribeInstances() invoked [Thu Jun 16 03:55:07 2011][003755][EUCADEBUG ] doDescribeResource() invoked [Thu Jun 16 03:55:07 2011][003755][EUCADEBUG ] doDescribeInstances() invoked [Thu Jun 16 03:55:13 2011][003755][EUCAERROR ] libvirt: monitor socket did not show up.: No such file or directory (code=38) [Thu Jun 16 03:55:13 2011][003755][EUCAFATAL ] hypervisor failed to start domain [Thu Jun 16 03:55:13 2011][003755][EUCADEBUG ] doDescribeResource() invoked [Thu Jun 16 03:55:13 2011][003755][EUCADEBUG ] doDescribeInstances() invoked [Thu Jun 16 03:55:15 2011][003755][EUCAERROR ] libvirt: Domain not found: no domain with matching name 'i-4C9D08C3' (code=42) [Thu Jun 16 03:55:15 2011][003755][EUCAINFO ] vrun(): [rm -rf /var/lib/eucalyptus/instances//admin/i-4C9D08C3/] [Thu Jun 16 03:55:15 2011][003755][EUCAINFO ] stopping the network (vlan=10) [Thu Jun 16 03:55:19 2011][003755][EUCADEBUG ] doDescribeResource() invoked [Thu Jun 16 03:55:19 2011][003755][EUCADEBUG ] doDescribeInstances() invoked [Thu Jun 16 03:55:25 2011][003755][EUCADEBUG ] doDescribeResource() invoked [Thu Jun 16 03:55:25 2011][003755][EUCADEBUG ] doDescribeInstances() invoked [Thu Jun 16 03:55:26 2011][003755][EUCAINFO ] doTerminateInstance() invoked (id=i-4C9D08C3) [Thu Jun 16 03:55:26 2011][003755][EUCAERROR ] libvirt: Domain not found: no domain with matching name 'i-4C9D08C3' (code=42) [Thu Jun 16 03:55:26 2011][003755][EUCAWARN ] warning: domain i-4C9D08C3 to be terminated not running on hypervisor [Thu Jun 16 03:55:31 2011][003755][EUCADEBUG ] doDescribeResource() invoked [Thu Jun 16 03:55:31 2011][003755][EUCADEBUG ] doDescribeInstances() invoked /var/log/libvirt/qemu/i-4C9D08C3.log: LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/bin /usr/bin/kvm -S -M pc-0.12 -enable-kvm -m 512 -smp 2 -name i-3D4B085B -uuid 68e17542-66cb-0240-81f5-d71c935e5a5e -nographic -chardev socket,id=monitor,path=/var/lib/libvirt/qemu/i-3D4B085B.monitor,server,nowait -monitor chardev:monitor -boot c -kernel /var/lib/eucalyptus/instances//admin/i-3D4B085B/kernel -initrd /var/lib/eucalyptus/instances//admin/i-3D4B085B/ramdisk -append root=/dev/sda1 console=ttyS0 -drive file=/var/lib/eucalyptus/instances//admin/i-3D4B085B/disk,if=scsi,index=0,boot=on,format=raw -net nic,macaddr=d0:0d:3d:4b:08:5b,vlan=0,model=e1000,name=e1000.0 -net tap,fd=44,vlan=0,name=tap.0 -chardev file,id=serial0,path=/var/lib/eucalyptus/instances//admin/i-3D4B085B/console.log -serial chardev:serial0 -parallel none -usb libvir: QEMU error : cannot set ownership on /var/lib/eucalyptus/instances//admin/i-3D4B085B/kernel: Permission denied more info: qemu user/group is eucalyptus/root I noticed that soem process (libvirt or qemu) is changing the ownership before termination: Before and after: 1. ll /var/lib/eucalyptus/instances//admin/i-3D4B085B/ 2. total 715912K 3. -rw-r--r-- 1 eucalyptus eucalyptus 10767826944 2011-06-16 04:01 disk 4. -rw------- 1 eucalyptus eucalyptus 571064 2011-06-16 04:01 instance-checkpoint 5. -rw-r--r-- 1 eucalyptus eucalyptus 4159008 2011-06-16 03:09 kernel 6. -rw-r--r-- 1 eucalyptus eucalyptus 933 2011-06-16 04:01 libvirt.xml 7. -rw-r--r-- 1 eucalyptus eucalyptus 3899035 2011-06-16 03:09 ramdisk 8. 9. ll /var/lib/eucalyptus/instances//admin/i-3D4B085B/ 10. total 715912K 11. -rw-r--r-- 1 root root 10767826944 2011-06-16 04:01 disk 12. -rw------- 1 eucalyptus eucalyptus 571064 2011-06-16 04:01 instance-checkpoint 13. -rw-r--r-- 1 root root 4159008 2011-06-16 03:09 kernel 14. -rw-r--r-- 1 eucalyptus eucalyptus 933 2011-06-16 04:01 libvirt.xml 15. -rw-r--r-- 1 root root 3899035 2011-06-16 03:09 ramdisk additional info: ls -al /var/lib/eucalyptus total 24K drwxr-xr-x 5 eucalyptus eucalyptus 4096 2011-06-16 03:34 . drwxr-xr-x 43 root root 4096 2011-06-16 02:29 .. -rw------- 1 eucalyptus eucalyptus 16 2011-06-16 03:34 .bash_history drwx------ 2 eucalyptus eucalyptus 4096 2011-06-16 02:52 .cache lrwxrwxrwx 1 eucalyptus eucalyptus 14 2011-06-16 02:49 instances -> /mnt/instances drwx------ 2 eucalyptus eucalyptus 4096 2011-06-16 02:52 keys drwxr-xr-x 2 eucalyptus root 4096 2011-06-16 02:43 .ssh ls -al /mnt/instances total 16K drwxrwxrwx 4 eucalyptus eucalyptus 4096 2011-06-16 03:09 . drwxr-xr-x 5 eucalyptus eucalyptus 4096 2011-06-16 02:25 .. drwxr-xr-x 2 eucalyptus eucalyptus 4096 2011-06-16 04:02 admin drwxr-xr-x 3 eucalyptus eucalyptus 4096 2011-06-16 03:09 eucalyptus Is there any solution to this problem? A workaround also works. Thanks Best, Ali

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[libvirt-users] request to add an application the app listing on libvirt site
by Ohad Levy 14 Jun '11

14 Jun '11

Hi, I would like to add two apps which uses libvirt the site. Ruby Objects for libvirt based on top of the native ruby binding, Virt ruby gem exposes real objects such as Host, Guest, StoragePool, Interface etc. more info at https://github.com/ohadlevy/virt Foreman - Web UI for provisioning and managing servers Among the many things foreman can do, It provides to relevant parts to libvirt: UI to list / start / stop / destroy vms UI to create a new vm as part of the provisioning process (e.g. dhcp, dns, tftp, pxe, vm, ks/preseed, puppet etc) more info at http://theforeman.org Thanks! Ohad

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[libvirt-users] Difference between function Migrate and Migrate2
by Abhishek Gupta 14 Jun '11

14 Jun '11

I was reading the API reference for the libvirt, when I came across the function virDomainMigrate and virDomainMigrate2. I am unable to find the difference between the two. Can someone please tell the difference in the application of the two? -- Abhishek

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[libvirt-users] Boot delay
by Jeff 14 Jun '11

14 Jun '11

Is there a method of tweaking the boot sequence of a KVM instance so that you can delay the process for X number of seconds? I don't have enough time between starting the KVM and connecting via VNC. Thanks Jeff

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[libvirt-users] libvirt-bin MOSTLY fails to create default virtual network
by m m 12 Jun '11

12 Jun '11

I have observed 3 scenarios after I reboot the host with 2 guests (which are supposed to autostart after boot/reboot of the host): 1. Default network is created but I can not ping guests. Gests don't have assigned IP address or they both have IP address 192.168.122.100. 2. Default network is not created. 3. Default netork is properly created and everything works fine. In each case guests are started and they work properly. Cases 1. and 2. happen a lot more often then case 3. My solutions: - When I restart libvirt-bin then everything is fine. - When I set 'sleep 40' in 'pre-start' section of /etc/init/libvirt-bin.conf and modify 'start on' section in the following way: start on (runlevel [2345] and net-device-up IFACE=br0) then everything works fine. However, none of the above solutions indeed solves the problem. Please, let me know if there is solution to this problem or what are your suggestions regarding this issue. **** HOST$ uname -a Linux ras 2.6.32-32-server #62-Ubuntu SMP Wed Apr 20 22:07:43 UTC 2011 x86_64 GNU/Linux GUEST1 and GUEST2 $ uname -a Linux server1-desktop 2.6.32-32-generic #62-Ubuntu SMP Wed Apr 20 21:54:21 UTC 2011 i686 GNU/Linux HOST$ libvirtd --version libvirtd (libvirt) 0.7.5 My idea was that some kernel modules sometimes are loaded before libvirt-bin starts, and sometimes libvirt-bin starts earlier, or in the middle of loading of these modules, that is why 3 scenarios can be observed. That is why I have added: cp /proc/modules /home/wsadmin2/modules1 cp /proc/modules /home/wsadmin2/modules2 to 'pre-start' and 'post-start' parts respectively of /etc/init/libvirt-bin.conf. Of course, beween execution of - pre-start part - exec /usr/sbin/libvirtd -d - post-start part other kernel modules can be loaded, so we can not be sure which additional modules in file 'modules2' were indeed loaded before libvirtd was actually started. Here are my observations: Scenatio 1. 33 (fixed) modules were logged - call them BASE MODULES. Scenatio 2. Beside BASE MODULES + the following modules were loaded: > iptable_filter 1841 0 - Live 0xffffffffa007c000 > ip_tables 18201 1 iptable_filter, Live 0xffffffffa0172000 > x_tables 22361 1 ip_tables, Live 0xffffffffa0164000 Scenatio 3. Beside BASE MODULES + the following modules were loaded: $ diff modules1 modules2 1c1,6 < iptable_filter 1841 0 - Live 0xffffffffa008b000 --- > xt_state 1490 14 - Live 0xffffffffa01ab000 > xt_tcpudp 2667 12 - Live 0xffffffffa01a5000 > nf_conntrack_ipv4 12742 14 - Live 0xffffffffa019b000 > nf_conntrack 73326 2 xt_state,nf_conntrack_ipv4, Live 0xffffffffa017d000 > nf_defrag_ipv4 1481 1 nf_conntrack_ipv4, Live 0xffffffffa0177000 > iptable_filter 1841 1 - Live 0xffffffffa008b000 3c8 < x_tables 22361 1 ip_tables, Live 0xffffffffa0162000 --- > x_tables 22361 3 xt_state,xt_tcpudp,ip_tables, Live 0xffffffffa0162000 Other observations: Scenatio 1. No errors in libvirtd.log Scenario 2. 10:06:06.980: error : networkAddIptablesRules:750 : failed to add iptables rule to allow DHCP requests from 'virbr0': Invalid argument (...) 10:06:08.630: error : qemudNetworkIfaceConnect:1445 : Failed to add tap interface to bridge 'virbr0': No such device 10:06:08.630: error : qemuAutostartDomain:584 : Failed to autostart VM 'cluster_server1': Failed to add tap interface to bridge 'virbr0': No such device 10:06:08.921: info : qemudDispatchSignalEvent:390 : Received unexpected signal 17 10:06:08.927: debug : virExecWithHook:617 : LC_ALL=C /usr/bin/kvm -help 10:06:08.938: info : qemudDispatchSignalEvent:390 : Received unexpected signal 17 10:06:09.000: error : qemudNetworkIfaceConnect:1445 : Failed to add tap interface to bridge 'virbr0': No such device 10:06:09.000: error : qemuAutostartDomain:584 : Failed to autostart VM 'cluster_server2': Failed to add tap interface to bridge 'virbr0': No such device (...) Scenatio 3. No errors in libvirtd.log I didn't see any valuable logs in /var/log/boot.log, /var/log/messages, /var/log/syslog. Please let me know if you want to see them anyway or have any suggestions right away.

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