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[libvirt-users] Wanted: method for qemu hook script to know if called for migration
by Whit Blauvelt 27 Jul '11

27 Jul '11

Hi, "Before a QEMU guest is started, the qemu hook script is called" (http://libvirt.org/hooks.html) In writing a simple bash script to prevent a VM on shared storage from being started on one host if it's already running on another, it's easy enough to check if virsh on the other host reports the particular VM as "shut off" there, and go ahead if that's the case. What's I'm having trouble coming up with is a simple method to allow a migration from the second system over to the first with that script in place. As the doc says, /etc/libvirt/hooks/qemu is "Executed when a QEMU guest is started, stopped, or migrated," so when it's simply being started, it makes sense to be sure it's not already running on the second system, and prevent the start if it's not. Works fine for me. But when a migration is requested, the script is called in the same way as when it's being started. What I need is a way, from within the script, to tell whether it's a migration context, so that then the start will be allowed, despite the VM's already being running on the second system. Any ideas how to do that? Unfortunately what's passed to the script directly is just "[vmname] start begin -" in both cases. And I don't see that a separate migrate process shows up in the process tables until after getting beyond the qemu hook script. As a feature suggestion, it would be nice if that fourth input variable, currently "-", was something like "migrate" in this instance. Thanks, Whit

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[libvirt-users] python-libvirt for 0.9.3 leaking file descriptors
by Igor Serebryany 26 Jul '11

26 Jul '11

i've reported this issue before, so i guess this is a regression. looks like the python bindings for 0.9.3 are leaking file descriptors: root@cloud1:~# python Python 2.6.6 (r266:84292, Dec 26 2010, 22:31:48) [GCC 4.4.5] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import libvirt >>> libvirt.getVersion() 9003 >>> def openclose(): ... c = libvirt.open('qemu:///system') ... c.close() ... >>> import os >>> os.system('lsof -p %d | wc -l' % os.getpid()) 37 >>> openclose() >>> os.system('lsof -p %d | wc -l' % os.getpid()) 40 >>> openclose() >>> os.system('lsof -p %d | wc -l' % os.getpid()) 43 every time I open and close a connection to libvirt, i loose 3 file descriptors. these are a socket and two fifo pipes. i'm using the -3 build on debian sid. can someone test this on a fedora machine? curious if this is something inside libvirt or a problem with the build... thanks, --igor

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[libvirt-users] insert ISO into a KVM guest
by Jeff 26 Jul '11

26 Jul '11

There's got to be a simple way to attach an ISO to a KVM guest. I just haven't yet discovered it. I've tried adding the following stanza to my guest XML file, under the <devices> stanza and starting the guest: <disk type='file' device='cdrom'> <driver name='qemu' type='raw' /> <source file='/etc/libvirt/qemu/isos/kvm1.iso' /> <target dev='hda' bus='ide' /> <readonly /> </disk> But I get the following: error: Failed to start domain rhel6guest error: internal error process exited while connecting to monitor: char device redirected to /dev/pts/3 qemu: could not open disk image /etc/libvirt/qemu/isos/kvm1.iso: Permission denied A perms issue should be easy to address one would think, but I've tried every possible combination of perms changes including 777. Changed ownership from root to qemu:qemu (though I'm running as root). I'm not running SELinux. Anyone have any insights on how to mount a simple ISO into a KVM guest? Both at build time AND while the guest is running? Thanks Jeff

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[libvirt-users] Ping not working after a migration
by Adnan Pasic 26 Jul '11

26 Jul '11

Hello guys, maybe you can help me with following issue. I have created a little cloud with a host and two worker nodes using opennebula. The setup went successfully until now, I am able to create VM's and move them via normal and live migration. Another (possibly) important information is that I configured my virtual bridge on both worker nodes like this: auto br0 iface br0 inet static address 192.168.0.[2|3] netmask 255.255.255.0 network 192.168.0.0 broadcast 192.168.0.255 #gateway 192.168.0.1 bridge_ports eth0 bridge_stp on bridge_maxwait 0 The command "brctl show" gives me following things back: bridge name bridge id STP enabled interfaces br0 8000.003005c34278 yes eth0 vnet0 (<- only appears on node with running VM) virbr0 8000.000000000000 yes According to thelibvirt wiki this setting is good as is. However, the issue I'm having is that when I create a VM and assign a static IP to it, which looks like e.g. 192.168.0.5, I firstly am able to ping this VM from both worker nodes, and also when I perform a live migration the ping stops for a few seconds (until the nodes realize the new route to this VM) and then starts pinging normally again. However, when I perform a normal migration the ping doesn't recover anymore, but answers repeatedly with: Destination Host Unreachable Do you know what could be the problem? Where is the difference between a normal and live migration and how can the ping after live migrating still work, but after a normal migration not? Thanks a lot! Regards, Adnan

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[libvirt-users] Split a qcow2-image?
by Stefan G. Weichinger 26 Jul '11

26 Jul '11

Hello, I converted a W2003-Server to a vmdk-image, I didn't think too much back then ... Now I have 2 windows-drives C: and E: inside one vmdk-image-file, which was converted to qcow2. I have installed drivers and stuff into that VM already and would like to avoid to start over again with the vmdk-file -> Is there a way to split that one qcow2 into 2 separate files, one for each windows-harddisk? or plan B: can I possibly enlarge the part of C: inside that qcow2? I use qemu-kvm on gentoo linux, and libvirt-0.9.3-r1. I would appreciate any help on this topic! Thanks Stefan

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[libvirt-users] Need help for Qemu-KVM
by kp chetan 25 Jul '11

25 Jul '11

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[libvirt-users] VM creation using libvirtd for the qemu-KVM hypervisor
by bala suru 25 Jul '11

25 Jul '11

Hi, I have some basic doubt at the VM creation using libvirtd for the qemu-KVM hypervisor . I need to create a VM which can read the data uart/file and store/send to other VM .. How to create this kind of VM and how to write the data in/out of the VM .. I need suggestion to do this . regards Bala

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Re: [libvirt-users] Is libvirt supported on Citrix Xenserver?
by sharmila radha krishnan 21 Jul '11

21 Jul '11

Hi,  I was finally able to connect to the xenapi hypervisor.  However, once I connect to virsh and give a 'quit' command I get  "* glibc detected *** virsh: double free or corruption (fasttop):". Please find below the actual memory dump.   Note: I have disabled the SSL certificate verification in xenapi_driver.c by setting curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0) & curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0).     [root@sharmila libvirt-0.9.2]# virsh -c "xenapi://localhost" Enter username for localhost: root Enter root's password for localhost: Welcome to virsh, the virtualization interactive terminal.    Type:  'help' for help with commands        'quit' to quit    virsh # list --all  Id Name                 State ----------------------------------   0 Control domain on host: sharmila running   - Control domain on host: sharmila running   - XenServer SDK 5.6.100-47101p import shut off    virsh # quit    *** glibc detected *** virsh: double free or corruption (fasttop): 0x09fcc370 *** ======= Backtrace: ========= /lib/libc.so.6[0xb6fc56c5] /lib/libc.so.6(cfree+0x59)[0xb6fc5b09] /usr/local/lib/libvirt.so.0(virFree+0x42)[0xb760d712] /usr/local/lib/libvirt.so.0[0xb777031d] /usr/local/lib/libvirt.so.0[0xb776ec10] /usr/local/lib/libvirt.so.0[0xb7676017] /usr/local/lib/libvirt.so.0(virUnrefConnect+0x128)[0xb7677888] /usr/local/lib/libvirt.so.0(virConnectClose+0xda)[0xb769ad4a] virsh[0x8065c73] virsh[0x806672f] /lib/libc.so.6(__libc_start_main+0xdc)[0xb6f71e9c] virsh[0x804e0f1] ======= Memory map: ======== 08048000-08079000 r-xp 00000000 08:01 378273     /usr/local/bin/virsh 08079000-0807a000 rw-p 00031000 08:01 378273     /usr/local/bin/virsh 09fa1000-0a060000 rw-p 00000000 00:00 0          [heap] b6b61000-b6b6c000 r-xp 00000000 08:01 182153     /lib/libgcc_s-4.1.2-20080825.so.1 b6b6c000-b6b6d000 rw-p 0000a000 08:01 182153     /lib/libgcc_s-4.1.2-20080825.so.1 b6b6d000-b6b77000 r-xp 00000000 08:01 181027     /lib/libnss_files-2.5.so b6b77000-b6b78000 r--p 00009000 08:01 181027     /lib/libnss_files-2.5.so b6b78000-b6b79000 rw-p 0000a000 08:01 181027     /lib/libnss_files-2.5.so b6b81000-b6b83000 rw-p 00000000 00:00 0 b6b83000-b6d83000 r--p 00000000 08:01 447132     /usr/lib/locale/locale-archive b6d83000-b6d86000 rw-p 00000000 00:00 0 b6d86000-b6d88000 r-xp 00000000 08:01 180820     /lib/libkeyutils-1.2.so b6d88000-b6d89000 rw-p 00001000 08:01 180820     /lib/libkeyutils-1.2.so b6d89000-b6d91000 r-xp 00000000 08:01 377484     /usr/lib/libkrb5support.so.0.1 b6d91000-b6d92000 rw-p 00007000 08:01 377484     /usr/lib/libkrb5support.so.0.1 b6d92000-b6d99000 r-xp 00000000 08:01 182148     /lib/librt-2.5.so b6d99000-b6d9a000 r--p 00007000 08:01 182148     /lib/librt-2.5.so b6d9a000-b6d9b000 rw-p 00008000 08:01 182148     /lib/librt-2.5.so b6d9b000-b6dab000 r-xp 00000000 08:01 180816     /lib/libresolv-2.5.so b6dab000-b6dac000 r--p 0000f000 08:01 180816     /lib/libresolv-2.5.so b6dac000-b6dad000 rw-p 00010000 08:01 180816     /lib/libresolv-2.5.so b6dad000-b6daf000 rw-p 00000000 00:00 0 b6daf000-b6ddf000 r-xp 00000000 08:01 378111     /usr/lib/libidn.so.11.5.19 b6ddf000-b6de0000 rw-p 0002f000 08:01 378111     /usr/lib/libidn.so.11.5.19 b6de0000-b6de1000 rw-p 00000000 00:00 0 b6de1000-b6de3000 r-xp 00000000 08:01 180823     /lib/libcom_err.so.2.1 b6de3000-b6de4000 rw-p 00001000 08:01 180823     /lib/libcom_err.so.2.1 b6de4000-b6e0a000 r-xp 00000000 08:01 378185     /usr/lib/libk5crypto.so.3.1 b6e0a000-b6e0b000 rw-p 00025000 08:01 378185     /usr/lib/libk5crypto.so.3.1 b6e0b000-b6e9f000 r-xp 00000000 08:01 378198     /usr/lib/libkrb5.so.3.3 b6e9f000-b6ea2000 rw-p 00093000 08:01 378198     /usr/lib/libkrb5.so.3.3 b6ea2000-b6ece000 r-xp 00000000 08:01 378160     /usr/lib/libgssapi_krb5.so.2.2 b6ece000-b6ecf000 rw-p 0002c000 08:01 378160     /usr/lib/libgssapi_krb5.so.2.2 b6ecf000-b6ed2000 r-xp 00000000 08:01 377492     /usr/lib/libgpg-error.so.0.3.0 b6ed2000-b6ed3000 rw-p 00002000 08:01 377492     /usr/lib/libgpg-error.so.0.3.0 b6ed3000-b6ed4000 rw-p 00000000 00:00 0 b6ed4000-b6f0f000 r-xp 00000000 08:01 182149     /lib/libsepol.so.1 b6f0f000-b6f10000 rw-p 0003b000 08:01 182149     /lib/libsepol.so.1 b6f10000-b6f1a000 rw-p 00000000 00:00 0 b6f1a000-b6f5a000 r-xp 00000000 08:01 378242     /usr/local/lib/libcurl.so.4.1.0 b6f5a000-b6f5b000 rw-p 00040000 08:01 378242     /usr/local/lib/libcurl.so.4.1.0 b6f5b000-b6f5c000 rw-p 00000000 00:00 0 b6f5c000-b70af000 r-xp 00000000 08:01 180994     /lib/libc-2.5.so b70af000-b70b1000 r--p 00153000 08:01 180994     /lib/libc-2.5.so b70b1000-b70b2000 rw-p 00155000 08:01 180994     /lib/libc-2.5.so b70b2000-b70b5000 rw-p 00000000 00:00 0 b70b5000-b70b8000 r-xp 00000000 08:01 180979     /lib/libdl-2.5.so b70b8000-b70b9000 r--p 00002000 08:01 180979     /lib/libdl-2.5.so b70b9000-b70ba000 rw-p 00003000 08:01 180979     /lib/libdl-2.5.so b70ba000-b70e1000 r-xp 00000000 08:01 182017     /lib/libm-2.5.so b70e1000-b70e2000 r--p 00026000 08:01 182017     /lib/libm-2.5.so b70e2000-b70e3000 rw-p 00027000 08:01 182017     /lib/libm-2.5.so b70e3000-b70e4000 rw-p 00000000 00:00 0 b70e4000-b70f6000 r-xp 00000000 08:01 378165     /usr/lib/libz.so.1.2.3 b70f6000-b70f7000 rw-p 00011000 08:01 378165     /usr/lib/libz.so.1.2.3 b70f7000-b7223000 r-xp 00000000 08:01 378174     /usr/lib/libxml2.so.2.6.26 b7223000-b7228000 rw-p 0012c000 08:01 378174     /usr/lib/libxml2.so.2.6.26 b7228000-b7229000 rw-p 00000000 00:00 0 b7229000-b723e000 r-xp 00000000 08:01 181033     /lib/libpthread-2.5.so b723e000-b723f000 r--p 00015000 08:01 181033     /lib/libpthread-2.5.so b723f000-b7240000 rw-p 00016000 08:01 181033     /lib/libpthread-2.5.so b7240000-b7242000 rw-p 00000000 00:00 0 b7242000-b7258000 r-xp 00000000 08:01 181005     /lib/libselinux.so.1 b7258000-b725a000 rw-p 00015000 08:01 181005     /lib/libselinux.so.1 b725a000-b7389000 r-xp 00000000 08:01 182129     /lib/libcrypto.so.0.9.8e b7389000-b739c000 rw-p 0012e000 08:01 182129     /lib/libcrypto.so.0.9.8e b739c000-b73a0000 rw-p 00000000 00:00 0 b73a0000-b73e4000 r-xp 00000000 08:01 180822     /lib/libssl.so.0.9.8e b73e4000-b73e8000 rw-p 00043000 08:01 180822     /lib/libssl.so.0.9.8e b73e8000-b7419000 r-xp 00000000 08:01 383239     /usr/lib/libcurl.so.3.0.0 b7419000-b741a000 rw-p 00031000 08:01 383239     /usr/lib/libcurl.so.3.0.0 b741a000-b741b000 rw-p 00000000 00:00 0 b741b000-b747b000 r-xp 00000000 08:01 378267     /usr/lib/libxenserver.so.1.3 b747b000-b747f000 rw-p 00060000 08:01 378267     /usr/lib/libxenserver.so.1.3 b747f000-b74a3000 r-xp 00000000 08:01 383129     /usr/lib/libssh2.so.1.0.1 b74a3000-b74a4000 rw-p 00024000 08:01 383129     /usr/lib/libssh2.so.1.0.1 b74a4000-b74a8000 r-xp 00000000 08:01 376977     /usr/lib/libxenstore.so.3.0.0 b74a8000-b74a9000 rw-p 00003000 08:01 376977     /usr/lib/libxenstore.so.3.0.0 b74a9000-b74ac000 rw-p 00000000 00:00 0 b74ac000-b752a000 r-xp 00000000 08:01 378181     /usr/lib/libgcrypt.so.11.5.2 b752a000-b752d000 rw-p 0007d000 08:01 378181     /usr/lib/libgcrypt.so.11.5.2 b752d000-b75a6000 r-xp 00000000 08:01 380857     /usr/lib/libgnutls.so.13.0.6 b75a6000-b75ac000 rw-p 00078000 08:01 380857     /usr/lib/libgnutls.so.13.0.6 b75ac000-b75ad000 rw-p 00000000 00:00 0 b75ad000-b75cc000 r-xp 00000000 08:01 180978     /lib/libdevmapper.so.1.02 b75cc000-b75ce000 rw-p 0001e000 08:01 180978     /lib/libdevmapper.so.1.02 b75cf000-b75d6000 r--s 00000000 08:01 412913     /usr/lib/gconv/gconv-modules.cache b75d6000-b75d7000 r-xp 00000000 08:01 377141     /usr/local/lib/libvirt-qemu.so.0.9.2 b75d7000-b75d8000 rw-p 00000000 08:01 377141     /usr/local/lib/libvirt-qemu.so.0.9.2Aborted    Moreover, Iam not able to start any VMs uisng xencenter after i have started using virsh. It says,  Error: Starting VM 'XenServer SDK 5.6.100-47101p import' - Internal error: another frontend device is already connected to this domain (frontend (domid=0 | kind=vbd | devid=51712); backend (domid=0 | kind=vbd | devid=51712)). Even a reboot of the machine didnt help.   Any pointers on the above 2 issues would be of great help.   Thanks in Advance!   Regards, Sharmila   From: "G Naresh Kumar"naresh.gadepalli(a)gmail.com Sent: Sat, 16 Jul 2011 16:55:16 +0530 To: Matthias Bolte matthias.bolte(a)googlemail.com Cc: libvirt-users(a)redhat.com Subject: Re: [libvirt-users] Is libvirt supported on Citrix Xenserver?   Hi Matthias, > Sorry for the confusion.It was an edited one & hence thetypo. Below is the actual output: # virsh -c xenapi://<myip> Enter username for <myip>: root Enter root's password for <myip>: error: authentication failed: (null) I was not able to get anything in the Xen logs. Somehowfigured out to print the Xen error using the patch given at the link http://osdir.com/ml/libvir- list/2011-06/msg00298.html. It prints"TRANSPORT_FAULT". Any pointers to this error would be much appreciated. Iam also trying to debugthis issue. As per your suggestion, I had used make rpm. But it requires xen-devel pacakge,which I was not able to get for Xen 3.4.2. Is there any way where I canuse the source package and build & install the library without using'make rpm' ? Thanks for all the help. > Regards Naresh > On Thu, Jul 14, 2011 at 7:07 PM, Matthias Bolte <matthias.bolte(a)googlemail.com> wrote: > 2011/7/14 G Naresh Kumar <naresh.gadepalli(a)gmail.com>: >> Hi Maththias, > > Thanks for the help. I finally was able to compile/install libvirt on >> xenserver. >> >> I tried compiling the libvirt 0.9.2 with xen api support. Was able to >> install it successfully. When I tried giving the virsh command, I got an >> ‘authentication failed’ error as shown below. >> >> # virsh -c xenapi://<my local ip> >> Enter username for <mylocalip>: root > >Here you entered root > >> Enter intel123's password for <my local ip>: > >but here it asks for intel123's, that's unexpected. Did you edit this >one before mailing it, or is there really this mismatch? > >> error: authentication failed: (null) > >Outputting (null) here is actually a bug. The only way this can happen >is when the login attempt fails but the XenServer doesn't provide an >error message. Maybe have a look at the XenServer logs to see if it >says something about a failed login attempt. > >> I also tried connecting to the local machine as below, >> >> virsh -c "xenapi:///" >> error: authentication failed: Server name not in URI >> error: failed to connect to the hypervisor > >The XenAPI driver expects a server name. xenapi:/// _could_ be treated >as xenapi://localhost, but it's not implemented that way. > >> Also I am trying to install ruby-libvirt on xenserver, which looks like >> requires libvirt-devel package to be installed. How do I build it from the >> libvirt 0.9.2 source package. > >Running 'make rpm' should build an libvirt-devel RPM package for you. > >> Thanks, >> >> Naresh >> >> On Wed, Jun 15, 2011 at 8:19 PM, Matthias Bolte >> <matthias.bolte(a)googlemail.com> wrote: >>> >>> 2011/6/15 G Naresh Kumar <naresh.gadepalli(a)gmail.com>: >>> > Hi Maththias, >>> > >>> > Thanks a lot for your response!. >>> > >>> > Is there a specific version of libvirt from which xenserver support is >>> > added? I am getting the below error >>> > >>> > "error: invalid argument in libvirt was built without the 'xenapi' >>> > driver" >>> >>> The means that your libvirt version is new enough and contains the >>> XenAPI driver but that it was disabled on configure time, probably >>> because the build server didn't have libxenserver installed and >>> libvirt's configure script automatically disabled the driver because >>> of a missing dependency. >>> >>> > I have installed libvirt from citrix yum repo. >>> >>> Then Citrix build libvirt without XenAPI support. As a long term >>> solution you could report to whom ever is responsible for that repo >>> and request to enabled XenAPI support in that libvirt package. As a >>> short term solution you could build libvirt from source yourself and >>> make sure to get the XenAPI driver enabled. >>> >>> > I am using Xenserver 5.5 with libvirt 0.8.2 and it does not seem to be >>> > working. >>> >>> According to http://libvirt.org/hvsupport.html and the error message >>> 0.8.2 is new enough. >>> >>> Matthias >>> >>> > Thanks, >>> > >>> > Naresh >>> > >>> > On Jun 15, 2011 7:03 PM, "Matthias Bolte" >>> > <matthias.bolte(a)googlemail.com> >>> > wrote: >>> >> 2011/6/15 G Naresh Kumar <naresh.gadepalli(a)gmail.com>: >>> >>> 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 >>> >> >>> >> libvirt can use XenAPI via libxenserver [1]. That should allow you to >>> >> use libvirt with a Citrix XenServer. You can use virsh like this >>> >> assuming you have a libxenserver enabled libvirt: >>> >> >>> >> virsh -c xenapi://my-xen-server >>> >> >>> >> But it's true, there is no documentation about this on the libvirt >>> >> website >>> >> yet. >>> >> >>> >> [1] http://community.citrix.com/display/xs/Download+SDKs >>> >> >>> >> -- >>> >> Matthias Bolte >>> >> http://photron.blogspot.com >>> > >> -- >> I was an atheist till I realized I am GOD >> > >-- > Matthias Bolte >http://photron.blogspot.com > >   >-- >I was an atheist till I realized I am GOD >_______________________________________________ >libvirt-users mailing list >libvirt-users(a)redhat.com >https://www.redhat.com/mailman/listinfo/libvirt-users

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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] problem w/ libvirt-0.8.2-15.el5 and CentOS
by Jim Glennon 20 Jul '11

20 Jul '11

I am running the Eucalyptus 2.0 cloud computing platform on an up-to-date CentOS 5 using the xen hypervisor. While attempting to attach a volume successfully created using jclouds with eucalyptus to a running VM instance, I encountered the following error: libvirt: Requested operation is not valid: Xm driver only supports modifying persistent config (code=55) i also tried attaching manually (i.e. euca-atttach-volume) and experienced the same failure. i found this discussion which mentions a possible libvirt/xen problem: https://bugzilla.redhat.com/show_bug.cgi?format=multiple&id=662908 however it does not appear that the fix is available for public consumption (at least i couldn't find it). from the Eucalyptus nc.log: [Tue Jul 19 22:16:47 2011][005714][EUCAINFO ] doAttachVolume() invoked (id=i-4DA80924 vol=vol-59CF0630 remote=/dev/etherd/e0.12 local=/dev/sda2) [Tue Jul 19 22:16:48 2011][005714][EUCAERROR ] libvirt: Requested operation is not valid: Xm driver only supports modifying persistent config (code=55) [Tue Jul 19 22:16:48 2011][005714][EUCAERROR ] AttachVolume() failed (err=-1) XML= [Tue Jul 19 22:16:48 2011][005714][EUCAERROR ] ERROR: doAttachVolume() failed error=1

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