March 2014 - Users - libvirt List Archives

[libvirt-users] some problem with snapshot by libvirt
by xingxing gao 21 Nov '14

21 Nov '14

Hi,all,i am using libvirt to manage my vm,in these days i am testing the libvirt snapshot ,but meet some problem: the snapshot was created from this command: snapshot-create-as win7 --disk-only --diskspec vda,snapshot=external --diskspec hda,snapshot=no but when i tried to revert from the snapshot which created from the above command ,i got error below: virsh # snapshot-revert win7 1338041515 --force error: unsupported configuration: revert to external disk snapshot not supported yet version: virsh # version Compiled against library: libvir 0.9.4 Using library: libvir 0.9.4 Using API: QEMU 0.9.4 Running hypervisor: QEMU 1.0.93

4 8

[libvirt-users] Passing non-standard Options through Libvirt to QEMU
by Asadullah Hussain 10 Apr '14

10 Apr '14

Hello, I have a custom QEMU which requires some non-standard command line arguments to launch a VM. e.g., "--proc-type=secondary" option is always required to launch a QEMU VM. To launch the VM through libvirt (virsh) "How do I specify these non-standard options in XML? OR if thats not possible ,Can you guide me at which point (code file) libvirt converts the XML to QEMU command (so that I can insert the option there). Regards -- Asadullah Hussain

2 3

[libvirt-users] method for communication between containers
by WANG Cheng D 09 Apr '14

09 Apr '14

Dear all, In my system, two containers need to exchange data as quick as possible and the two containers are hosted by the same physical machine, I wonder if socket is the only method for communication between containers? Thank you. Cheng Wang

2 6

[libvirt-users] Programmatically force shutdown a guest: possible?
by Pasquale Dir 31 Mar '14

31 Mar '14

I am looking at the shutdown method, but if the guest system is a desktop system, like for example ubuntu, it just has the effect to show a box prompting the user for a shutdown/reboot/ and such. I could enter the guest and change this default behaviour and it actually works..but I'd like for a way to send a shutdown command without doing so. Is it possible?

3 4

[libvirt-users] Connecting libvirt to manually compiled QEMU
by Asadullah Hussain 31 Mar '14

31 Mar '14

Hello I have manually compiled a customized qemu (1.4.0) which runs fine on its own (create VM etc) but I want to access this qemu through libvirt (virt-manager, virsh etc). But the libvirt driver only looks into "/usr/bin" for qemu binaries, how can I tell libvirt to connect to my qemu which is placed at "/home/user/qemu" directory. -- Asadullah Hussain

3 6

[libvirt-users] Specify a disk image file which is on an iscsi target
by Pasquale Dir 31 Mar '14

31 Mar '14

Hello, for my vm I'd like to specify a disk image which would be on an iscsi target. Currently, by using targets directly, I'd just specify the path in /dev/disk/by-path/ip-192.168.1.2:3260-iscsi-iqn.myiqn but how to specify a file which is actually INSIDE this path, ex. /dev/disk/by-path/ip-192.168.1.2:3260-iscsi-iqn.myiqn/myVmImage.img ? I saw that there is another path in /media/myHomeUser/anId but do this id changes each time?

1 0

[libvirt-users] virsh attach-disk live guest problem
by john fisher 28 Mar '14

28 Mar '14

Hypervisor= ubuntu 12.04.2 guest = ubuntu 12.04.4 used virt-manager to create a new storage file in qcow2 format on hypervisor and then attach it to the guest. In virt-man I can see the disk is attached. trying virsh attach-disk I get a failure saying disk already attached virsh dump xml shows the disk at vdb as it should be but on the guest, fdisk -l shows no vdb and its not in /proc I found one reference to apparmor saying add /proc rw to hypervisor's apparmor libvirt conf But I see some release notes that might be about avoiding this ( sounds insecure) so... Do I have to stop and restart the guest, change apparmor or what? -- John Fisher

1 1

[libvirt-users] Using qemu+ssh on openSUSE 13.1/Tumbleweed
by Johannes Kastl 28 Mar '14

28 Mar '14

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi everyone, I am trying to get libvirt with qemu-kvm to work on my machines running openSUSE 13.1 / Tumbleweed. My question is in regard to using qemu+ssh, which would be my preference, as I already have a working ssh-key authentication with SSH-Agent. I set the permissions of the manage-socket to 0770, added my user to the libvirt group and set auth_unix_rw = "none" in /etc/libvirt/libvirtd.conf. I am now able to see all my VMs using virsh list --all (I had to set a default_uri in .config/libvirt/libvirt.conf to get any non-empty output). Trying from another machine (say target hostname is HOSTX, username testuser) with virsh -c qemu+ssh://testusers@HOSTX/system always results in >> error: failed to connect to the hypervisor error: internal error: >> received hangup / error event on socket I see this in /var/log/messages (lines will be wrapped in the mail, sorry): > 2014-03-24T21:25:55.023525+01:00 HOSTX sshd[3509]: Accepted > publickey for testuser from 192.168.79.8 port 54176 ssh2 > 2014-03-24T21:25:55.024744+01:00 HOSTX sshd[3509]: > pam_unix(sshd:session): session opened for user testuser by (uid=0) > 2014-03-24T21:25:55.025717+01:00 HOSTX kernel: [ 3162.225673] > type=1006 audit(1395692755.024:69): pid=3509 uid=0 old > auid=4294967295 new auid=1000 old ses=4294967295 new ses=24 res=1 > 2014-03-24T21:25:55.027501+01:00 HOSTX systemd[1]: Starting Session > 24 of user testuser. 2014-03-24T21:25:55.027918+01:00 HOSTX > systemd-logind[703]: New session 24 of user testuser. > 2014-03-24T21:25:55.028213+01:00 HOSTX systemd[1]: Started Session > 24 of user testuser. 2014-03-24T21:25:55.081719+01:00 HOSTX > sshd[3511]: Received disconnect from 192.168.79.8: 11: disconnected > by user 2014-03-24T21:25:55.082095+01:00 HOSTX sshd[3509]: > pam_unix(sshd:session): session closed for user testuser > 2014-03-24T21:25:55.086268+01:00 HOSTX systemd-logind[703]: Removed > session 24. I am curious about the 'Received disconnect from 192.168.79.8: 11: disconnected by user' thing. How can I fix this? Or how to debug this? How can I get more info from libvirt? /var/log/kvm is an empty directory, /var/log/libvirt/qemu just has logs for the different VMs. I have already tried to get polkit running, although I think it should not be used due to the auth_unix_rw = "none". Any help will be appreciated. Versions: openSUSE TUmbleweed (which is openSUSE 13.1 with some more recent software) qemu-kvm is version 1.7.90-19.1.x86_64 libvirt is 1.1.2 The following packes are installed: libvirt-1.1.2-2.18.3.x86_64 libvirt-client-1.1.2-2.18.3.x86_64 libvirt-daemon-1.1.2-2.18.3.x86_64 libvirt-daemon-config-network-1.1.2-2.18.3.x86_64 libvirt-daemon-config-nwfilter-1.1.2-2.18.3.x86_64 libvirt-daemon-driver-interface-1.1.2-2.18.3.x86_64 libvirt-daemon-driver-libxl-1.1.2-2.18.3.x86_64 libvirt-daemon-driver-lxc-1.1.2-2.18.3.x86_64 libvirt-daemon-driver-network-1.1.2-2.18.3.x86_64 libvirt-daemon-driver-nodedev-1.1.2-2.18.3.x86_64 libvirt-daemon-driver-nwfilter-1.1.2-2.18.3.x86_64 libvirt-daemon-driver-qemu-1.1.2-2.18.3.x86_64 libvirt-daemon-driver-secret-1.1.2-2.18.3.x86_64 libvirt-daemon-driver-storage-1.1.2-2.18.3.x86_64 libvirt-daemon-driver-uml-1.1.2-2.18.3.x86_64 libvirt-daemon-driver-vbox-1.1.2-2.18.3.x86_64 libvirt-daemon-driver-xen-1.1.2-2.18.3.x86_64 libvirt-daemon-lxc-1.1.2-2.18.3.x86_64 libvirt-daemon-qemu-1.1.2-2.18.3.x86_64 libvirt-doc-1.1.2-2.18.3.x86_64 libvirt-glib-1_0-0-0.1.7-2.1.3.x86_64 libvirt-python-1.1.2-2.18.3.x86_64 Regards, Johannes - -- Have you ever noticed that the Klingons are all speaking unix? 'Grep ls awk chmod.'' 'Mknod ksh tar imap.' 'Wall fsck yacc!' (that last is obviously a curse of some sort). Gandalf Parker -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) Comment: Using GnuPG with SeaMonkey - http://www.enigmail.net/ iEYEARECAAYFAlM0CU8ACgkQzi3gQ/xETbKKyQCfVQ4XviDo5+92ivOIgx4lXIty 980An28BKHjfwZiRh5T2Yyj3wHwOLrYJ =ujio -----END PGP SIGNATURE-----

1 2

[libvirt-users] host crashes "unable to handle paging request"
by Raphael Bauduin 28 Mar '14

28 Mar '14

Hi, we have regular crashed of a kvm host with the error "unable to handle paging request". Can this be due to memory over-commitment even if some memory is still used by the kernel for caches and buffers? (collectd graph shows no free memory, with 15G used, very little buffers, and 1G cache). There are 32GB of swap, of which only 150MB are used. I suspect might be the direction to search to find the cause, but would be happy to learn from people versed in the kernel behaviour to confirm or reject my hypothesis. Below is the full error. Thanks! Raph 745 Mar 23 14:27:37 sMaster01 kernel: [241450.355339] BUG: unable to handle kernel paging request at ffff8804c001fade 746 Mar 23 14:27:37 sMaster01 kernel: [241450.355384] IP: [<ffffffff8117e9e9>] bio_check_eod+0x29/0xcd 747 Mar 23 14:27:37 sMaster01 kernel: [241450.355433] PGD 1002063 PUD 0 748 Mar 23 14:27:37 sMaster01 kernel: [241450.355464] Oops: 0000 [#1] SMP 749 Mar 23 14:27:37 sMaster01 kernel: [241450.355496] last sysfs file: /sys/devices/system/cpu/cpu15/ topology/thread_siblings 750 Mar 23 14:27:37 sMaster01 kernel: [241450.355551] CPU 4 751 Mar 23 14:27:37 sMaster01 kernel: [241450.355577] Modules linked in: ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT xt_tcpudp kvm_amd kvm ip6table_filter ip6_tables iptable_fi lter ip_tables x_tables tun nfsd exportfs nfs lockd fscache nfs_acl auth_rpcgss sunrpc bridge stp bonding dm_round_robin dm_multipath scsi_dh loop snd_pcm snd_timer snd soundcore snd_page_alloc serio_raw evdev tpm_tis tpm tpm_bios p smouse pcspkr amd64_edac_mod edac_core button edac_mce_amd shpchp i2c_piix4 container pci_hotplug i2c_core processor ext3 jbd mbcache dm_mirror dm_region_hash dm_log dm_snapshot dm_mod sd_mod crc_t10dif mptsas mptscsih mptbase lpfc ehci_hcd scsi_transport_fc tg3 scsi_tgt scsi_transport_sas ohci_hcd libphy scsi_mod usbcore nls_base thermal fan thermal_sys [last unloaded: scsi_wait_scan] 752 Mar 23 14:27:37 sMaster01 kernel: [241450.356084] Pid: 3557, comm: kjournald Not tainted 2.6.32.61vanilla #1 PRIMERGY BX630 S2 753 Mar 23 14:27:37 sMaster01 kernel: [241450.356141] RIP: 0010:[<ffffffff8117e9e9>] [<ffffffff8117e9e9>] bio_check_eod+0x29/0xcd 754 Mar 23 14:27:37 sMaster01 kernel: [241450.356196] RSP: 0018:ffff8804229abba0 EFLAGS: 00010202 755 Mar 23 14:27:37 sMaster01 kernel: [241450.356228] RAX: ffff8804c001fad6 RBX: ffff8802e7235080 RCX: 00011200061e5110 756 Mar 23 14:27:37 sMaster01 kernel: [241450.356279] RDX: 0000000000000008 RSI: 0000000000000008 RDI: ffff8802e7235080 757 Mar 23 14:27:37 sMaster01 kernel: [241450.356331] RBP: ffff8802e7235080 R08: 0000000000000000 R09: ffff880425c54c00 758 Mar 23 14:27:37 sMaster01 kernel: [241450.356383] R10: 0000000000000003 R11: 00000000022e539e R12: ffff8802e7235080 759 Mar 23 14:27:37 sMaster01 kernel: [241450.356434] R13: ffff8802e7235080 R14: ffff880425c54c00 R15: ffff8802e6281850 760 Mar 23 14:27:37 sMaster01 kernel: [241450.356486] FS: 00007faa6a757820(0000) GS:ffff88000fc80000(0000) knlGS:0000000000000000 761 Mar 23 14:27:37 sMaster01 kernel: [241450.356540] CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b 762 Mar 23 14:27:37 sMaster01 kernel: [241450.356573] CR2: ffff8804c001fade CR3: 00000000cc11f000 CR4: 00000000000006e0 763 Mar 23 14:27:37 sMaster01 kernel: [241450.356628] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 764 Mar 23 14:27:37 sMaster01 kernel: [241450.356681] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 765 Mar 23 14:27:37 sMaster01 kernel: [241450.356733] Process kjournald (pid: 3557, threadinfo ffff8804229aa000, task ffff88041490a300) 766 Mar 23 14:27:37 sMaster01 kernel: [241450.356788] Stack: 767 Mar 23 14:27:37 sMaster01 kernel: [241450.356812] ffff880415382c00 0000000100000285 ffff8804229abfd8 0000000000005186 768 Mar 23 14:27:37 sMaster01 kernel: [241450.356852] <0> 0000000000000000 000000000f1c2776 ffff8804128efa38 ffff8802e7235080 769 Mar 23 14:27:37 sMaster01 kernel: [241450.356913] <0> ffff8802e7235080 ffff8802e7235080 ffff8800cdacae40 ffffffff8117eb5a 770 Mar 23 14:27:37 sMaster01 kernel: [241450.356993] Call Trace: 771 Mar 23 14:27:37 sMaster01 kernel: [241450.357021] [<ffffffff8117eb5a>] ? generic_make_request+0xcd/0x2f9 772 Mar 23 14:27:37 sMaster01 kernel: [241450.357058] [<ffffffff810b6034>] ? mempool_alloc+0x55/0x106 773 Mar 23 14:27:37 sMaster01 kernel: [241450.357091] [<ffffffff8117ee5c>] ? submit_bio+0xd6/0xf2 774 Mar 23 14:27:37 sMaster01 kernel: [241450.357125] [<ffffffff8110d83f>] ? submit_bh+0xf5/0x115 775 Mar 23 14:27:37 sMaster01 kernel: [241450.357158] [<ffffffff8110edc0>] ? sync_dirty_buffer+0x51/0x93 776 Mar 23 14:27:37 sMaster01 kernel: [241450.357196] [<ffffffffa01727c7>] ? journal_commit_transaction+0xaa6/0xe4f [jbd] 777 Mar 23 14:27:37 sMaster01 kernel: [241450.357252] [<ffffffffa0175194>] ? kjournald+0xdf/0x226 [jbd] 778 Mar 23 14:27:37 sMaster01 kernel: [241450.357288] [<ffffffff810651de>] ? autoremove_wake_function+0x0/0x2e 779 Mar 23 14:27:37 sMaster01 kernel: [241450.357324] [<ffffffffa01750b5>] ? kjournald+0x0/0x226 [jbd] 780 Mar 23 14:27:37 sMaster01 kernel: [241450.357357] [<ffffffff81064f11>] ? kthread+0x79/0x81 781 Mar 23 14:27:37 sMaster01 kernel: [241450.357391] [<ffffffff81011baa>] ? child_rip+0xa/0x20 782 Mar 23 14:27:37 sMaster01 kernel: [241450.357425] [<ffffffff81016568>] ? read_tsc+0xa/0x20 783 Mar 23 14:27:37 sMaster01 kernel: [241450.357456] [<ffffffff81064e98>] ? kthread+0x0/0x81 784 Mar 23 14:27:37 sMaster01 kernel: [241450.357487] [<ffffffff81011ba0>] ? child_rip+0x0/0x20 785 Mar 23 14:27:37 sMaster01 kernel: [241450.357517] Code: 5c c3 41 55 49 89 fd 41 54 55 53 48 83 ec 38 65 48 8b 04 25 28 00 00 00 48 89 44 24 28 31 c0 85 f6 0f 84 86 00 00 00 48 8b 47 10 <48> 8b 40 08 48 8b 40 68 48 c1 f8 09 74 74 89 f2 48 8b 0f 48 39 786 Mar 23 14:27:37 sMaster01 kernel: [241450.357738] RIP [<ffffffff8117e9e9>] bio_check_eod+0x29/0xcd 787 Mar 23 14:27:37 sMaster01 kernel: [241450.357772] RSP <ffff8804229abba0> 788 Mar 23 14:27:37 sMaster01 kernel: [241450.357799] CR2: ffff8804c001fade 789 Mar 23 14:27:37 sMaster01 kernel: [241450.358183] ---[ end trace 608fcf1f5a482549 ]--- -- Web database: http://www.myowndb.com Free Software Developers Meeting: http://www.fosdem.org

1 1

[libvirt-users] LXC + passthrough mount and host filesystem-cache
by James R. Leu 28 Mar '14

28 Mar '14

Hello, I'm using libvirt to build/run LXC instances. My LXC instances use passthrough filesystem mounts. When I try to do large file systems operations (ex tar or rsync) the file systems cache on the host spikes and causes the OOM handler to run and kills processes in the LXC. Has anyone else seen this? Is there a way around this? At this point I'm resorting to running a cron job that dumps the filesystem cache every 5 minutes. The result is the filesystem cache on the host never grows too large and OOM never runs against LXC processes. The obvious down fall is that I'm killing my filesystem performance by duming the cache. I'm currently running libvirt 1.0.0 -- James R. Leu

2 2

[libvirt-users] Facing some error when restarting the libvirtd.
by cool dharma06 28 Mar '14

28 Mar '14

hi, i installed libvirt-1.2.1 from the source with xen-4.3.1 and i am facing the following error when restarting the libvirt. Installation steps: ./autogen.sh --system --with-xen=yes --with-libxl=yes make make install and in the libvirtd.conf i enabled the following things auth_unix_ro auth_unix_rw unix_sock_group unix_sock_ro_perms unix_sock_rw_perms unix_sock_dir and libvirt logs when running the following commands i got error message in libvirtd.log tools/libvirtd -f /etc/libvirt/libvirtd.conf -d Error message: 2014-03-28 12:44:59.480+0000: 20024: info : libvirt version: 1.2.2 2014-03-28 12:44:59.480+0000: 20024: error : virIdentityGetSystem:173 : Unable to lookup SELinux process context: Invalid argument 2014-03-28 12:44:59.557+0000: 20024: error : libxlDriverConfigNew:1123 : Unable to configure libxl's memory management parameters 2014-03-28 12:44:59.557+0000: 20024: error : virStateInitialize:749 : Initialization of LIBXL state driver failed: Unable to lookup SELinux process context: Invalid argument 2014-03-28 12:44:59.557+0000: 20024: error : daemonRunStateInit:920 : Driver state initialization failed Any suggestion to solve this one. regards, cooldharma06..:)

1 0

[libvirt-users] TUN/TAP device for lxc guest
by 邓尧 28 Mar '14

28 Mar '14

I want to run a VPN software inside an lxc guest, but the required TUN/TAP device (/dev/net/tun) is missing in the container. Anyone knows how to enable this device ? Here is the definition XML: <domain type="lxc"> <name>centos</name> <memory unit="MiB">1024</memory> <os> <type>exe</type> <init>/sbin/init</init> </os> <devices> <console type="pty"/> <filesystem type="mount"> <source dir="/virsh/centos"/> <target dir="/"/> </filesystem> <interface type="bridge"> <source bridge="br0"/> <model type="virtio"/> </interface> </devices> </domain> Thanks Yao

2 1

[libvirt-users] Libvirt libssh2 authentication
by David Dias 27 Mar '14

27 Mar '14

Hi, I am working on a java application using libvirt java API (version 0.4.7) and i would like to authenticate through ssh within my application (no need for the user to type his password). How can i submit SSH authentication credentials to libvirt? I am trying to get it working using libssh2 callback, but i get the error: "SSH transport error: no suitable method to retrieve authentication credentials" before anything happens. I have the same error running "virsh -c qemu+libssh2://username@host/system list" command. What is the right way to get the ssh connection working from the java code? regards, David

2 2

[libvirt-users] Attach / detach problem for passthrough/SR-IOV in libvirt
by Mohsen Ghaemi 27 Mar '14

27 Mar '14

Hi all I just encountered a problem in libvirt while was trying to attach and detach a sr-iov vf to my VM The version of my libvirt is 1.1.1-0ubuntu8.5 I tried to attach the device using following xml <interface type='hostdev' managed='yes'> <mac address='5c:01:fd:12:34:58'/> <source> <address type='pci' domain='0x0000' bus='0x04' slot='0x01' function='0x1'/> </source> </interface> When i attached device it worked properly and i managed to ping another host. virsh # attach-device t5 1.xml Device attached successfully But when i detached it still i had network traffic in my VM but libvirt (virsh) said that virsh # detach-device t5 1.xml Device detached successfully The next time i tried to attach it libvirt said that virsh # attach-device t5 1.xml error: Failed to attach device from 1.xml error: Requested operation is not valid: PCI device 0000:04:01.1 is in use by domain t5 I tried it with different VMs and different guest OSs that the same happend. The same action was done with another host running libvirt version Installed: 1.0.2-0ubuntu11.13.04.5~cloud1 Candidate: 1.0.2-0ubuntu11.13.04.5~cloud1 and it worked pretty OK. No problem. Do you have any idea what is wrong? More information: Kernel : 3.8.0-37-generic /etc/libvirt/qemu.conf : security_driver = "none” root@compute01:~# ethtool -i eth5 driver: bnx2x version: 1.78.58 firmware-version: bc 7.4.22 phy 1.34 bus-info: 0000:04:00.1 supports-statistics: yes supports-test: yes supports-eeprom-access: yes supports-register-dump: yes

1 0

[libvirt-users] libvirt-users@redhat.com
by Mohsen Ghaemi 27 Mar '14

27 Mar '14

Hi all I just encountered a problem in libvirt while was trying to attach and detach a sr-iov vf to my VM The version of my libvirt is 1.1.1-0ubuntu8.5 I tried to attach the device using following xml <interface type='hostdev' managed='yes'> <mac address='5c:01:fd:12:34:58'/> <source> <address type='pci' domain='0x0000' bus='0x04' slot='0x01' function='0x1'/> </source> </interface> When i attached device it worked properly and i managed to ping another host. virsh # attach-device t5 1.xml Device attached successfully But when i detached it still i had network traffic in my VM but libvirt (virsh) said that virsh # detach-device t5 1.xml Device detached successfully The next time i tried to attach it libvirt said that virsh # attach-device t5 1.xml error: Failed to attach device from 1.xml error: Requested operation is not valid: PCI device 0000:04:01.1 is in use by domain t5 I tried it with different VMs and different guest OSs that the same happend. The same action was done with another host running libvirt version Installed: 1.0.2-0ubuntu11.13.04.5~cloud1 Candidate: 1.0.2-0ubuntu11.13.04.5~cloud1 and it worked pretty OK. No problem. Do you have any idea what is wrong? More information: Kernel : 3.8.0-37-generic /etc/libvirt/qemu.conf : security_driver = "none” root@compute01:~# ethtool -i eth5 driver: bnx2x version: 1.78.58 firmware-version: bc 7.4.22 phy 1.34 bus-info: 0000:04:00.1 supports-statistics: yes supports-test: yes supports-eeprom-access: yes supports-register-dump: yes

1 0

[libvirt-users] Sending command to virtual machine
by lukass.vacek＠seznam.cz 26 Mar '14

26 Mar '14

Hello, I would like to know if there is a way how to execute a command inside of running virDomainPtr. For example call exec command but not on my computer, but on running virtual machine. If there is a way, what needs to be done for it? Thanks for answer!

2 1

[libvirt-users] Recreating nwfilter rules without a restart
by Brian Rak 26 Mar '14

26 Mar '14

Let's say I have some iptables rules defined to restrict guest traffic. If I restart the hosts firewall 'service iptables restart', all the guest-specific rules get blown away. Is there a way to reapply all the guest firewall rules, without restarting each individual guest? It looks like if I edit a nwfilter with `virsh nwfilter-edit` it goes and reapplies the rules to all the guests, so this functionality seems to be present already.

1 1

[libvirt-users] who Maintain netfilter, i want to submit a patch
by bigclouds 26 Mar '14

26 Mar '14

hi,all i have a patch for netfilter, i want to talk with you, how to submit ? thanks

3 2

[libvirt-users] Starting processes inside VMs using Libvirt?
by Taimur Al Said 25 Mar '14

25 Mar '14

Hi there, I am a beginner with Libvirt. I was practicing using Python bindings with libvirt to do some basic stuff like starting a VM, rebooting a VM, displaying the number of domain,etc. I was wondering since the hypervisor has control over the VMs, it is possible to use Libvirt to inject code into the VM? Is it possible to start processes inside a particular VM using the Libvirt API. If not, what would you recommend instead? Thanks in advance Regards, T.alsaid

3 4

[libvirt-users] Clock problems on live migration
by Paul Boven 24 Mar '14

24 Mar '14

Hi everyone, While doing a live migration, Linux guests will frequently get stuck and become unresponsive, while the CPU utilization on the host for that guest goes to 100%. Sometimes they recover, and dmesg then shows that there's been a clock problem during the live migration: Clocksource tsc unstable (delta = 35882846234 ns) So the TSC did a jump of nearly 36 seconds. Migrations often fail when going from server A to B, but will then work fine in the other direction. Both servers are locked to the same NTP source, and are well within 1ms from one another. Both hosts are running Ubuntu 13.04 with these versions (from Ubuntu packages): Kernel: 3.8.0-35-generic x86_64 Libvirt: 1.0.2 Qemu: 1.4.0 Gluster-fs: 3.4.2 (libvirt access the images via the filesystem, not using libgfapi yet). The interconnect between both machines (both for migration and gluster) is 10GbE. We have different guests (all Ubuntu releases, 13.04 and 13.10), and they all seem to be affected. Clocksource: kvm-clock on all guests. Clock entry from the guest XML: <clock offset='utc'/> Now as far as I've read in the documentation of kvm-clock, it specifically supports live migrations, so I'm a bit surprised at these problems. There isn't all that much information to find on these issue, although I have found postings by others that seem to have run into the same issues, but without a solution. Any help would be much appreciated. Regards, Paul Boven. -- Paul Boven <boven(a)jive.nl> +31 (0)521-596547 Unix/Linux/Networking specialist Joint Institute for VLBI in Europe - www.jive.nl VLBI - It's a fringe science

1 0

[libvirt-users] io mode=native precisions
by Raphael Bauduin 24 Mar '14

24 Mar '14

Hi, Before switching to io mode=native, I wanted to check if there are any disadvantages or potential problem with this setting. I virtio-blk data plane required to use this setting effectively? (as illustrated here: http://blog.vmsplice.net/2013/03/new-in-qemu-14-high-performance-virtio.html) Is there a requirement on the host kernel (eg minimum version)? Thanks in advance Raph

2 3

[libvirt-users] can I undo the snapshot apply of a qcow2 image
by lyz_pro 24 Mar '14

24 Mar '14

Hi all I have a problem. Two days ago , I used kvm-img create a snapshot of an qcow2 format image. And today I apply the snapshot of this image. The question is can I recovery the image to the last point . I mean Undo this snapshot apply -------------- lyz_pro 2014-03-24

2 1

[libvirt-users] Issues to manage RAM on openvz guests
by Aurelien Martin 22 Mar '14

22 Mar '14

Hi all, I'm playing with virsh, and I succeed to mange easily some KVM nodes. But I have issues to size RAM of openvz guests. virsh set by default the the memory to 256M on each guest instead of that I specify in the XML I have to modify by end the variable PHYSPAGES on each /etc/vz/conf/id_of_my_vz.conf Please follow the XML dump and the steps that I did. Cheers,Aurelien Log ---- 1) Define openvz guest domain 103 #virsh -c openvz:///system define vztest.xml Domain 103 defined from vztest.xml 2) Start the guest #virsh -c openvz:///system start 103 Domain 103 started #vzlist CTID NPROC STATUS IP_ADDR HOSTNAME 103 20 running - - 3) Check memory size vz guest 103 #vzctl enter 103 entered into CT 103 #root@test:/# free -m total used free shared buffers cached Mem: 256 27 228 0 0 14 -/+ buffers/cache: 13 242 Swap: 512 0 512 vztest.xml ----------- <domain type='openvz'> <name>100</name> <uuid>86c12009-e591-a159-6e9f-91d18b85ef78</uuid> <memory unit='GiB'>1</memory> <currentMemory unit='GiB'>1</currentMemory> <vcpu placement='static'>1</vcpu> <os> <type>exe</type> <init>/sbin/init</init> </os> <devices> <filesystem type='template' accessmode='passthrough'> <source name='debian-7.0-x86_64'/> <target dir='/'/> </filesystem> <interface type='bridge'> <mac address='00:16:3e:1a:66:67'/> <source bridge='br0'/> <target dev='veth3'/> </interface> </devices> </domain> xmldump -------- <domain type='openvz' id='103'> <name>103</name> <uuid>86c52009-e541-a159-6e9f-91d18b85ef79</uuid> <memory unit='KiB'>0</memory> <currentMemory unit='KiB'>0</currentMemory> <vcpu placement='static'>1</vcpu> <os> <type>exe</type> <init>/sbin/init</init> </os> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>destroy</on_reboot> <on_crash>destroy</on_crash> <devices> <filesystem type='template' accessmode='passthrough'> <source name='debian-7.0-x86_64'/> <target dir='/'/> </filesystem> <interface type='bridge'> <mac address='00:16:3e:1a:66:67'/> <source bridge='br0'/> <target dev='veth3'/> </interface> </devices> </domain>

1 1

[libvirt-users] Live migration process in src/qemu_driver.ca
by Faizul Bari 20 Mar '14

20 Mar '14

Hello, I have been trying to track different phases of a live migration process. I am using libvirt with qemu-kvm. I am issuing migration commands using virsh. Now, I want to measure the time spent in each phase of live migration, e.g., pre-copy and stop-copy. I stumbled upon the file qemu_driver.c. It has functions like qemudDomainMigratePrepare2 qemudDomainMigratePerform qemudDomainMigrateFinish2 I want to know whether qemudDomainMigratePerform and qemudDomainMigrateFinish2 directly map to the pre-copy and stop-copy phase? or the qemudDomainMigratePerform function performs both of them? Any pointers or suggestions will be greatly appreciated. Regards ---------------------- Md. Faizul Bari PhD Student David R. Cheriton School of Computer Science University of Waterloo {http://www.cs.uwaterloo.ca/~mfbari} [My mind rebels at stagnation! Give me problems! Give me work!]

2 3

[libvirt-users] Linux host / Windows guest sharing
by Pal, Laszlo 20 Mar '14

20 Mar '14

Hi, I'm almost give up again because for a day I try to access my windows kvm guest from FC20 :) I've tried everything including virtio mapping mount -t 9p -o trans=virtio,version=9p2000.L hostshare /tmp/hostfiles where I get the following messages mount: special device hostshare does not exist --- --- to be honest clipboard sharing would be enough for me, so I googled why it is not working and I applied this: https://mytechdepot.wordpress.com/2013/02/22/enabling-clipboard-copy-paste-… yum install spice-vdagent # chkconfig --add spice-vdagentd # service spice-vdagentd start but, the clipboard sharing isn't working.... Do you have any idea to solve any of the issues above? Thank you Vlad

4 6