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[libvirt-users] Detaching LVM volume from Windows guest
by mkey 20 Aug '11

20 Aug '11

Hello, I have some difficulties regarding to above title. Windows as guest OS is running on KVM(Ubuntu natty). After attaching LVM volume to guest OS and did "safely remove device" in guest windows, detaching volume was failed. > root@localhost:/opt/win# virsh detach-disk testwin vdc > error: Failed to detach disk > errpr: operation failed: detaching virtio-disk2 device failed: Device 'virtio-disk2' not found But kvm(qemu?) seems like detaching device successfully. > root@localhost:/opt/win# virsh qemu-monitor-command testwin 'info block' > drive-virtio-disk0: type=hd removable=0 file=/opt/win/win2008server.virtio.img ro=0 drv=qcow2 encrypted=0 So, problem is, libvirt doesn't know detaching, but kvm(qemu) knows. Again, please let me know if anybody has workaround. P.S. at some website, I found "hotunplugging is not supported in current libvirt", is that related on this matter? Regards, mkey

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[libvirt-users] Detaching LVM volume from Windows guest
by mkey 20 Aug '11

20 Aug '11

Hello, I have some difficulties regarding to above title. Windows as guest OS is running on KVM(Ubuntu natty). After attaching LVM volume to guest OS and did "safely remove device" in guest windows, detaching volume was failed. > root@localhost:/opt/win# virsh detach-disk testwin vdc > error: Failed to detach disk > errpr: operation failed: detaching virtio-disk2 device failed: Device 'virtio-disk2' not found But kvm(qemu?) seems like detaching device successfully. > root@localhost:/opt/win# virsh qemu-monitor-command testwin 'info block' > drive-virtio-disk0: type=hd removable=0 file=/opt/win/win2008server.virtio.img ro=0 drv=qcow2 encrypted=0 So, problem is, libvirt doesn't know detaching, but kvm(qemu) knows. Again, please let me know if anybody has workaround. P.S. at some website, I found "hotunplugging is not supported in current libvirt", is that related on this matter? Regards, mkey

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[libvirt-users] build libvirt from source yourself and make sure to get the XenAPI driver enabled.
by Lovocas Mou 19 Aug '11

19 Aug '11

Hi, I want install libvirt on my ubuntu11.04, and I want to test using libvirt to manage a xenserver, after download the tar and extract them when in this step : ./configure --with-esx --with-xenapi --prefix=/opt/libvirt .... checking for xen_vm_start in -lxenserver... no configure: error: You must install the XenServer Library to compile XenAPI driver with -lxenserver ..... I get this error, but i get very few information about it from google. >>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 I download the libxenserver source and binary file from the above url, but I don't know how to install it and how to use -lxenserver, can anyone help me? thanks!

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[libvirt-users] Detecting the last user of a connection has closed.
by Andy Joslin 18 Aug '11

18 Aug '11

The documentation says something that concerns me: http://libvirt.org/html/libvirt-libvirt.html#virConnectClose "It is possible for the last virConnectClose<http://libvirt.org/html/libvirt-libvirt.html#virConnectClose>to return a positive value if some other object still has a temporary reference to the connection, but the application should not try to further use a connection after the virConnectClose<http://libvirt.org/html/libvirt-libvirt.html#virConnectClose>that matches the initial open." The application I am working on requires that I know when the last thread using this connection goes away, so I can properly cleanup some overhead. If I can't trust the return value of this call, how will I know that the connection is indeed torn down? Under what circumstances will the virConnectClose behave this way? Thanks, BTW, I am using 0.8.2

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[libvirt-users] which vols added to storage pool during refresh?
by Gareth S Bestor 17 Aug '11

17 Aug '11

(opps, actually meant to post this to libvirt-users instead of libvirt-cim...) We're looking at a problem when we have a libvirt pool defined, below [root@xnl2192 ~]# virsh pool-dumpxml ScsiPool-host2 <pool type='scsi'> <name>ScsiPool-host2</name> <uuid>f2ea1882-881f-9f49-838d-39e070f68002</uuid> <capacity>136583315456</capacity> <allocation>136583315456</allocation> <available>0</available> <source> <adapter name='host2'/> </source> <target> <path>/dev/disk/by-id</path> <permissions> <mode>0700</mode> <owner>-1</owner> <group>-1</group> </permissions> </target> </pool> As you can see, this pool maps to /dev/disk/by-id. There may be a large number of actual volume entries in /dev/disk/by-id, however it appears only a distinct subset of them are actually added into the libvirt pool when you do a pool-refresh. What does libvirt check when determining which, and whether or not, to add one of these volume into the vol-list? In particular, we have a case when one specific volume in /dev/disk/by-id is *not* added into the pool, and no amount of pool-refresh makes a difference. We did notice that if you remove all the sym links in /dev/disk/by-id and do a pool-refresh, that libvirt re-scans the bus, recreates the links in /dev/disk/by-id, and adds (some of) the volumes back into the vol-list. But not this one problematic vol, so clearly there is something about this vol that libvirt doesnt like and why it is (deliberately?) not added to the pool. What checks, etc does libvirt make against vols when determining whether to add them to a pool? - G Dr. Gareth S. Bestor IBM Senior Software Engineer Systems & Technology Group - Systems Management Standards 971-285-6375 (mobile) bestor(a)us.ibm.com_______________________________________________ Libvirt-cim mailing list Libvirt-cim(a)redhat.com https://www.redhat.com/mailman/listinfo/libvirt-cim

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Re: [libvirt-users] Migration hangs on Gentoo with KVM
by Eric Blake 17 Aug '11

17 Aug '11

[re-adding the list] On 08/01/2011 04:22 PM, Jonathan Stoppani wrote: > > On Aug 1, 2011, at 16:20 , Eric Blake wrote: > >> On 08/01/2011 04:11 PM, Jonathan Stoppani wrote: >>> Hi there, >>> >>> I'm trying to migrate a domain between two Gentoo hosts using KVM as hypervisor, but the migration hangs. >>> I tried both live or offline migration modes without success. >> >> Does your 'nc' command have a -q option? If so, then this is probably >> >> https://bugzilla.redhat.com/show_bug.cgi?id=726174 >> > > Thanks for the prompt answer Eric! Yes, nc has a q option: > > -q, --hold-timeout=SEC1[:SEC2] Set hold timeout(s) for local [and remote] Glad to hear that we found root cause to your problems, then. > > The bug specifically refers to ssh, does that mean that it should work over tcp? The problem is that libvirt is trying to start a remote nc session over ssh; but looking at http://libvirt.org/remote.html, it looks like ssh is the only protocol using nc in that manner (so yes, you can probably avoid the issue by using tcp or tls). Meanwhile, I think you can work around it without patching libvirt, by using this as your remote URI: qemu+ssh://user@remotehost/system?netcat=/path/to/nc-wrapper where nc-wrapper is an executable script installed on remotehost, looking like: #!/bin/sh exec /path/to/real/nc -q0 "$@" -- Eric Blake eblake(a)redhat.com +1-801-349-2682 Libvirt virtualization library http://libvirt.org

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[libvirt-users] segfault while unloading libvirt provider.
by Sharad Mishra 17 Aug '11

17 Aug '11

I have a CIM provider that just calls virConnectOpen("qemu:///system"); and virConnectClose(). When cimom unloads this provider segfaults - #0 0x000000305b420cd0 in ?? () (gdb) bt #0 0x000000305b420cd0 in ?? () #1 0x00000031a3e05ad9 in __nptl_deallocate_tsd () from /lib64/libpthread.so.0 #2 0x00000031a3e0674b in start_thread () from /lib64/libpthread.so.0 #3 0x00000031a32d3d1d in clone () from /lib64/libc.so.6 If I remove virConnectOpen and virConnectClose, the provider unloads without any problem. I am using RHEL 5.5 with libvirt-0.6.3-33.el5 and kvm-83-164.el5. Any ideas on this core? Regards, Sharad Mishra Open Virtualization Linux Technology Center IBM

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[libvirt-users] A few more questions ....
by William A. Mahaffey III 17 Aug '11

17 Aug '11

.... I have a 64-bit CentOS 5.6 VM running on a 64-bit FC14 host, libvirt 0.8.3-10.fc14, 64-bit. I am getting messages in my syslog file, 2 about every 20 min. about dnsmasq: Aug 17 04:53:52 Q6600 dnsmasq-dhcp[1969]: DHCPREQUEST(virbr0) 192.168.122.213 52:54:00:a4:98:a3 Aug 17 04:53:52 Q6600 dnsmasq-dhcp[1969]: DHCPACK(virbr0) 192.168.122.213 52:54:00:a4:98:a3 Aug 17 05:20:13 Q6600 dnsmasq-dhcp[1969]: DHCPREQUEST(virbr0) 192.168.122.213 52:54:00:a4:98:a3 Aug 17 05:20:13 Q6600 dnsmasq-dhcp[1969]: DHCPACK(virbr0) 192.168.122.213 52:54:00:a4:98:a3 Aug 17 05:40:57 Q6600 dnsmasq-dhcp[1969]: DHCPREQUEST(virbr0) 192.168.122.213 52:54:00:a4:98:a3 Aug 17 05:40:57 Q6600 dnsmasq-dhcp[1969]: DHCPACK(virbr0) 192.168.122.213 52:54:00:a4:98:a3 Aug 17 06:08:53 Q6600 dnsmasq-dhcp[1969]: DHCPREQUEST(virbr0) 192.168.122.213 52:54:00:a4:98:a3 Aug 17 06:08:53 Q6600 dnsmasq-dhcp[1969]: DHCPACK(virbr0) 192.168.122.213 52:54:00:a4:98:a3 Aug 17 06:32:44 Q6600 dnsmasq-dhcp[1969]: DHCPREQUEST(virbr0) 192.168.122.213 52:54:00:a4:98:a3 Aug 17 06:32:44 Q6600 dnsmasq-dhcp[1969]: DHCPACK(virbr0) 192.168.122.213 52:54:00:a4:98:a3 Aug 17 06:58:59 Q6600 dnsmasq-dhcp[1969]: DHCPREQUEST(virbr0) 192.168.122.213 52:54:00:a4:98:a3 Aug 17 06:58:59 Q6600 dnsmasq-dhcp[1969]: DHCPACK(virbr0) 192.168.122.213 52:54:00:a4:98:a3 Aug 17 07:19:23 Q6600 dnsmasq-dhcp[1969]: DHCPREQUEST(virbr0) 192.168.122.213 52:54:00:a4:98:a3 Aug 17 07:19:23 Q6600 dnsmasq-dhcp[1969]: DHCPACK(virbr0) 192.168.122.213 52:54:00:a4:98:a3 Aug 17 07:40:27 Q6600 dnsmasq-dhcp[1969]: DHCPREQUEST(virbr0) 192.168.122.213 52:54:00:a4:98:a3 Aug 17 07:40:27 Q6600 dnsmasq-dhcp[1969]: DHCPACK(virbr0) 192.168.122.213 52:54:00:a4:98:a3 Aug 17 08:01:33 Q6600 dnsmasq-dhcp[1969]: DHCPREQUEST(virbr0) 192.168.122.213 52:54:00:a4:98:a3 Aug 17 08:01:33 Q6600 dnsmasq-dhcp[1969]: DHCPACK(virbr0) 192.168.122.213 52:54:00:a4:98:a3 Aug 17 08:24:20 Q6600 rpc.mountd[1689]: authenticated mount request from 192.168.122.213:1010 for /home (/home) Aug 17 08:27:23 Q6600 dnsmasq-dhcp[1969]: DHCPREQUEST(virbr0) 192.168.122.213 52:54:00:a4:98:a3 Aug 17 08:27:23 Q6600 dnsmasq-dhcp[1969]: DHCPACK(virbr0) 192.168.122.213 52:54:00:a4:98:a3 Aug 17 08:27:49 Q6600 kernel: [253719.519366] CIFS VFS: No username specified Aug 17 08:27:49 Q6600 kernel: [253719.519394] CIFS VFS: cifs_mount failed w/return code = -22 Aug 17 08:27:49 Q6600 kernel: [253719.527482] CIFS VFS: No username specified Aug 17 08:27:49 Q6600 kernel: [253719.527507] CIFS VFS: cifs_mount failed w/return code = -22 Aug 17 08:31:23 Q6600 kernel: [253932.627920] CIFS VFS: No username specified Aug 17 08:31:23 Q6600 kernel: [253932.627949] CIFS VFS: cifs_mount failed w/return code = -22 Aug 17 08:31:23 Q6600 kernel: [253932.637894] CIFS VFS: No username specified Aug 17 08:31:23 Q6600 kernel: [253932.637925] CIFS VFS: cifs_mount failed w/return code = -22 Aug 17 08:32:51 Q6600 rpc.mountd[1689]: authenticated mount request from 192.168.0.15:939 for /home (/home) Aug 17 08:38:38 Q6600 rpc.mountd[1689]: authenticated unmount request from 192.168.0.15:619 for /home (/home) Aug 17 08:38:43 Q6600 rpc.mountd[1689]: authenticated mount request from 192.168.0.15:644 for /home (/home) Aug 17 08:44:53 Q6600 rpc.mountd[1689]: authenticated unmount request from 192.168.0.15:699 for /home (/home) Aug 17 08:52:08 Q6600 dnsmasq-dhcp[1969]: DHCPREQUEST(virbr0) 192.168.122.213 52:54:00:a4:98:a3 Aug 17 08:52:08 Q6600 dnsmasq-dhcp[1969]: DHCPACK(virbr0) 192.168.122.213 52:54:00:a4:98:a3 Aug 17 08:59:13 Q6600 rpc.mountd[1689]: authenticated unmount request from 192.168.122.213:671 for /home (/home) Aug 17 09:16:46 Q6600 dnsmasq-dhcp[1969]: DHCPREQUEST(virbr0) 192.168.122.213 52:54:00:a4:98:a3 Aug 17 09:16:46 Q6600 dnsmasq-dhcp[1969]: DHCPACK(virbr0) 192.168.122.213 52:54:00:a4:98:a3 Aug 17 09:43:00 Q6600 dnsmasq-dhcp[1969]: DHCPREQUEST(virbr0) 192.168.122.213 52:54:00:a4:98:a3 Aug 17 09:43:00 Q6600 dnsmasq-dhcp[1969]: DHCPACK(virbr0) 192.168.122.213 52:54:00:a4:98:a3 They are washing other stuff out of easy view .... Is there a way to silence these messages ? Also, my ifconfig shows: [root@Q6600:/etc, Wed Aug 17, 09:51 AM] 1250 # ifconfig eth0 Link encap:Ethernet HWaddr 00:E0:81:C4:F1:A8 inet addr:192.168.0.9 Bcast:192.168.0.255 Mask:255.255.255.0 inet6 addr: fe80::2e0:81ff:fec4:f1a8/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:27188084 errors:0 dropped:0 overruns:0 frame:0 TX packets:24641412 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:26215788177 (24.4 GiB) TX bytes:20506959836 (19.0 GiB) Interrupt:16 Memory:d0100000-d0120000 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:135350 errors:0 dropped:0 overruns:0 frame:0 TX packets:135350 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:99406539 (94.8 MiB) TX bytes:99406539 (94.8 MiB) virbr0 Link encap:Ethernet HWaddr FE:54:00:A4:98:A3 inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1849 errors:0 dropped:0 overruns:0 frame:0 TX packets:3276 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:259897 (253.8 KiB) TX bytes:559502 (546.3 KiB) vnet0 Link encap:Ethernet HWaddr FE:54:00:A4:98:A3 inet6 addr: fe80::fc54:ff:fea4:98a3/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:2335 errors:0 dropped:0 overruns:0 frame:0 TX packets:33985 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:308069 (300.8 KiB) TX bytes:1933956 (1.8 MiB) [root@Q6600:/etc, Wed Aug 17, 09:57 AM] 1251 # Is there a way to get vnet0 to use IPV4 ? Where is that configured ? I presume that it (vnet0) is the server/host end of the virbr0 bridge, what type of interface is it ? The online docs are good & voluminous, but I haven't (yet) found any info on this question. In fact, the pages I have seen where brctl commands are shown show nothing for the interface of virbr0 (empty space, no output), where mine shows: [root@Q6600:/etc, Wed Aug 17, 10:19 AM] 1256 # brctl show bridge name bridge id STP enabled interfaces virbr0 8000.fe5400a498a3 yes vnet0 [root@Q6600:/etc, Wed Aug 17, 10:19 AM] 1257 # hence my questions about vnet0 :-) .... TIA for any clues .... -- William A. Mahaffey III ---------------------------------------------------------------------- "The M1 Garand is without doubt the finest implement of war ever devised by man." -- Gen. George S. Patton Jr.

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[libvirt-users] virt-install -> guest stops at installation end
by Julien Garet 17 Aug '11

17 Aug '11

Hello, I am using virt-install to install CentOS6 guests on a CentOS6 KVM remote host. Everything works fine except that at the end of the installation, the guest stops instead of rebooting, which I thought, should be the default behaviour. The command I use is : [root@myorchestrator]# /usr/local/bin/virt-install --connect qemu+ssh://root@mydom0/system --name myclient --accelerate --ram 2048 --disk path=/mnt/client.img,size=10 --os-type=linux --network bridge:mybridge --vnc --pxe -m 52:54:00:00:3d:a9 virt-install version is 0.500.6 on the host where I use virt-install. libvirt is version 0.8.1 (CentOS 6) on dom0. Any advice ? Julien Garet

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[libvirt-users] Question about terminology
by Jeff 16 Aug '11

16 Aug '11

I'm having a minor disagreement with a colleague over terminology. When you have a group of KVM Hosts which have access to the same network and storage (for purposes of migration) yet there is no clusterware or HA software involved...how does one refer to this group of hosts? I call them a "Host Group." He insists on the term "Cluster." To me, "cluster" indicates the presence of an HA solution such as RHCS or VCS and using the term when neither exist would generate confusion. He insists that since VMWare refers to the same configuration as a "cluster" that this is how we should refer to it with regard to KVM. Wouldn't be that big of a deal, except that I'm trying to develop operational documentation. Anyone else out there have suggestions? Jeff

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