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[libvirt-users] RH6 qemu expects driver name
by Robert Šmol 17 Mar '11

17 Mar '11

Hi, I am trying to start machine on RH6. virsh # start ulp-001 error: Failed to start domain ulp-001 error: internal error process exited while connecting to monitor: char device redirected to /dev/pts/1 qemu-kvm: -device lsi,id=scsi0,bus=pci.0,addr=0x5: Parameter 'driver' expects a driver name Try with argument '?' for a list. virsh # version Compiled against library: libvir 0.8.1 Using library: libvir 0.8.1 Using API: QEMU 0.8.1 Running hypervisor: QEMU 0.12.1 This is part of the config <disk type='file' device='disk'> <driver name='qemu' type='raw'/> <source file='/rhev-data/defaultStore/ulp-001a.img'/> <target dev='sda' bus='scsi'/> <address type='drive' controller='0' bus='0' unit='0'/> </disk> <controller type='ide' index='0'> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/> </controller> <controller type='scsi' index='0'> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/> </controller> Any tips? -- stereoIT - Open Source Technology Partners http://www.stereoit.com mobile: +420 776 762378

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[libvirt-users] SSH recovery console
by Nikita A Menkovich 16 Mar '11

16 Mar '11

Hello, Is there available to create ssh recovery console except vnc console, that is default by libvirt. For example connect to kvm@host:2220 and go to first console For example like here <serial type="tcp"> <source mode="bind" host="127.0.0.1" service="2445"/> <protocol type="telnet"/> <target port="1"/> </serial> But not plain format -- Nikita A Menkovich http://libc6.org/ JID: menkovich(a)gmail.com

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[libvirt-users] With which VMM ,libvirt cooperates the most?
by kadir yüceer 16 Mar '11

16 Mar '11

Hi all, I'm trying to develop some applications that communicate with VMM about guest OSs. Libvirt has drivers for many VMMs like Qemu, Vbox, etc. I'm currently using Vbox and time to time I get the error that says "this function is not supported by the connection driver". So, for which VMM, libvirt has the most compatible driver, regarding your experiences? Kind regards Kadir

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[libvirt-users] remote xen+ssh://host
by sd 15 Mar '11

15 Mar '11

Hello, Is there a way where I can connect remote via ssh on a host and specify the username / password ? So far I found out that only the username can be specified and that will ssh keys. I would like something like xen+ssh://user:password@host thanks sd

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[libvirt-users] Beware! Newbie is in town
by kadir yüceer 15 Mar '11

15 Mar '11

Hello everyone, I'm working on Ubuntu 10.10, installed libvirt and created a project in Netbeans, I included jna.jar and libvirt-0.4.7.jar. And guess what, I get the exception below when I'm trying to run test.java which connects to test:///default. Exception in thread "main" java.lang.UnsatisfiedLinkError: Unable to load library 'virt': libvirt.so: cannot open shared object file: No such file or directory at com.sun.jna.NativeLibrary.loadLibrary(NativeLibrary.java:164) at com.sun.jna.NativeLibrary.getInstance(NativeLibrary.java:237) at com.sun.jna.Library$Handler.<init>(Library.java:140) at com.sun.jna.Native.loadLibrary(Native.java:374) at com.sun.jna.Native.loadLibrary(Native.java:359) at org.libvirt.jna.Libvirt.<clinit>(Unknown Source) at org.libvirt.Connect.<clinit>(Unknown Source) at novatest_v01.Main.main(Main.java:21) I'm sure this question has been asked dozens of times, sorry. But any answer/comment is appreciated. Thanks Kadir

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[libvirt-users] cgroups limitations on Virtual machines
by Zvi Dubitzky 14 Mar '11

14 Mar '11

I have 2 VMs launched by : 'virsh create <xml file>' . Both VMs get 2 vcpus (out of total 2 cores of the host) I then try bias their cpu cycle quota by manipulating the cpu_shares ( virsh schedinfo --set cpu_shares=<value> vm1/2 ) so that VM1 will get 3 times the cpu cycles VM2 gets. (e.g : VM1 cpu_shares = 150 . VM2 cpu_shares = 50) . There are no other VMs defined or any other significant process running on the host . Each VM runs the same process (2 threads endless loop ). Still both VM1 and VM2 get equal share of the 2 cores - running top utility at the host shows each is consuming 100% CPU. At each VM console cat /proc/cpuinfo shows 2 cores assigned to the VM. At the host : virsh vcpuinfo <vm1/2> shows each has 2 vcpus (0 an 1 )but actually a single separate CPU is used for either vcpu0 or vcpu1 at each VM at any check point in time (this is reasonable as it does not say what portion of the core cycles is used by each VM) . Can anyone explain that and how to bias the core usage of the 2 VMs by manipulating the cpu_shares parameter (or other parameters) so that 'top' at the host will reflect the bias . I would expect 'top' at the host to show 150% CPU for VM1 ( qemu-system-x86) and 50% CPU for VM2 (the other qemu-system-x86) with above set cpu_share values . Doing the same test with 2 plain processes (instead VMs udner libvirt) with same cpu_shares bias gives the expected biased cpu usage between the 2 processes My system is fedora14 and kernel 2.6.35.6-45.fc14.x86_64 . thanks Zvi Dubitzky Email:dubi@il.ibm.com

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[libvirt-users] QEMU monitor
by Nikita A Menkovich 14 Mar '11

14 Mar '11

Hello, Is there any way to change VNC password without rebooting virtual machine? It is available through qemu monitor, but, it seems, there is no way to do add monitor to kvm. -- Nikita A Menkovich http://libc6.org/ JID: menkovich(a)gmail.com

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[libvirt-users] ruby bindings has two gems (I think)
by James Barkley 14 Mar '11

14 Mar '11

When I look at remote gems I see: - libvirt (0.2.0), "A ruby client library providing an interface to libvirt via FFI" - ruby-libvirt (0.3.0), "Provides bindings for libvirt" I've been using ruby-libvirt, but maybe I should give libvirt a try? Has anyone used libvirt (0.2.0) and developed opinions they'd like to share? -jb

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[libvirt-users] Libvirt with multipath devices and/or FC on NPIV
by C.D. 14 Mar '11

14 Mar '11

Hello, I am trying to find out a best practice for a specific scenario. First of all I would like to know what is the proper way to set up multipath, who should care about it the host or the guest. Right now I have a setup where I have one multipath which sets my host to boot from FC SAN. I have another multipathed LUN in the host which is essentially a dm which I attached to a guest, however through virtio. I added the devices through virsh with pool type of "mpath" and path through /dev/mapper/. So here is my first question: with such a setup the multipath and eventual fail-over is taken care by the host OS, right, the guest will not notice is I suppose? But what about migration. What if I decide to migrate the guest to another host. How would that work out? WIth shared directory it is easy, you just have the images in it, but what about such a setup. I can always add the aforementioned LUN, where the guest resides to another Storage Group on the SAN where the new host has access and I can make sure that the mpath device name is persistent across all hosts, but is that the right approach. Here is another question that is bugging me. I have FC HBA-s on all hosts and I would like to make a HBA visible through my guest. I stumbled upon a bug that is documented in redhat's bugzilla that attempted creation of NPIV on pci_0000_blah_blah instead on the scsi_hostX device, but I fixed that easily in the xml and although virsh doesn't seem to think I completed the nodedev-create NPIV_for_my_FC.xml the device is seen as a child in nodedev-list and what is more important the WWN are seen on the SAN switch. So this seems to be working OK, however I don't know how to attach this new shiny device that I created to a guest. Could someone give me a hint? What is the proper way to attach this new devices to a guest OS and do that persistently. Do I do that with virsh's attach-device and if so what is the proper XML format? Should I dump the XML for the newly created NPIV nodedev and try to attach that? And again with multipathing. What if I decided to create NPIV on my two FC cards in every host, then do the zoning and attach those newly created NPIV nodes to the guests? Will that produce the same effect that such a multipath does on the host? It doesn't really matter if I would use it for root drive or a shared gfs2 storage between guests, I just want to know is this possible and is it the right thing to do, or should I stick to setup in my previous paragraph? And last question: what about migration with such NPIV FC devices. I can move a guest around, but will that move my NPIV FC with it's WWN so that I can continue using my zoning (I think I just realized that this might be impossible because I'm migrating the guest, not the entire setup of libvirt, but probably I'm wrong and I'm not aware of a proper method to do it correctly?). Probably those questions are easy to answer, but please bare with me, I'm playing with libvirt in an enterprise setup only for the last couple of days and I would really like to make it right and kick some VMware ass. By the way, all my hosts are Fedora 14, with kernel 2.6.37 (rebuild of the one for Fedora 15 from koji, because there was a small glitch with Qlogic's driver in the stock 2.6.35). Most of my guests will be SL6,CentOS5/6(when it arrives) and a couple of windows XP guests (but I'm not really concerned with that). Thanks for the support in advance P.S. please keep me in CC, as I'm not on the list. Thank you

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[libvirt-users] Libvirt with multipath devices and/or FC on NPIV
by C.D. 14 Mar '11

14 Mar '11

Hello, I am trying to find out a best practice for a specific scenario. First of all I would like to know what is the proper way to set up multipath, who should care about it the host or the guest. Right now I have a setup where I have one multipath which sets my host to boot from FC SAN. I have another multipathed LUN in the host which is essentially a dm which I attached to a guest, however through virtio. I added the devices through virsh with pool type of "mpath" and path through /dev/mapper/. So here is my first question: with such a setup the multipath and eventual fail-over is taken care by the host OS, right, the guest will not notice is I suppose? But what about migration. What if I decide to migrate the guest to another host. How would that work out? WIth shared directory it is easy, you just have the images in it, but what about such a setup. I can always add the aforementioned LUN, where the guest resides to another Storage Group on the SAN where the new host has access and I can make sure that the mpath device name is persistent across all hosts, but is that the right approach. Here is another question that is bugging me. I have FC HBA-s on all hosts and I would like to make a HBA visible through my guest. I stumbled upon a bug that is documented in redhat's bugzilla that attempted creation of NPIV on pci_0000_blah_blah instead on the scsi_hostX device, but I fixed that easily in the xml and although virsh doesn't seem to think I completed the nodedev-create NPIV_for_my_FC.xml the device is seen as a child in nodedev-list and what is more important the WWN are seen on the SAN switch. So this seems to be working OK, however I don't know how to attach this new shiny device that I created to a guest. Could someone give me a hint? What is the proper way to attach this new devices to a guest OS and do that persistently. Do I do that with virsh's attach-device and if so what is the proper XML format? Should I dump the XML for the newly created NPIV nodedev and try to attach that? And again with multipathing. What if I decided to create NPIV on my two FC cards in every host, then do the zoning and attach those newly created NPIV nodes to the guests? Will that produce the same effect that such a multipath does on the host? It doesn't really matter if I would use it for root drive or a shared gfs2 storage between guests, I just want to know is this possible and is it the right thing to do, or should I stick to setup in my previous paragraph? And last question: what about migration with such NPIV FC devices. I can move a guest around, but will that move my NPIV FC with it's WWN so that I can continue using my zoning (I think I just realized that this might be impossible because I'm migrating the guest, not the entire setup of libvirt, but probably I'm wrong and I'm not aware of a proper method to do it correctly?). Probably those questions are easy to answer, but please bare with me, I'm playing with libvirt in an enterprise setup only for the last couple of days and I would really like to make it right and kick some VMware ass. By the way, all my hosts are Fedora 14, with kernel 2.6.37 (rebuild of the one for Fedora 15 from koji, because there was a small glitch with Qlogic's driver in the stock 2.6.35). Most of my guests will be SL6,CentOS5/6(when it arrives) and a couple of windows XP guests (but I'm not really concerned with that). Thanks for the support in advance

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