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[libvirt-users] Migration with rbd storage backend
by Andrey Korolyov 19 May '12

19 May '12

Hi, Seems that such migration is currently broken, at least for 0.9.11|0.9.12, with 0.9.8 all works fine: virsh migrate --live testvm qemu+tcp://towerbig/system ---snip--- 2012-05-17 21:22:30.250+0000: 16926: debug : qemuDriverCloseCallbackGet:605 : vm=testvm, uuid=feb7ccb6-1087-8661-9284-62e3a1e9f44a, conn=(nil) 2012-05-17 21:22:30.250+0000: 16926: debug : qemuDriverCloseCallbackGet:611 : cb=(nil) 2012-05-17 21:22:30.250+0000: 16926: error : virStorageFileIsSharedFSType:1007 : Invalid relative path 'rbd/testvm-Vwu': Invalid argument 2012-05-17 21:22:30.250+0000: 16926: debug : qemuDomainObjEndAsyncJob:955 : Stopping async job: migration out 2012-05-17 21:22:30.250+0000: 16926: debug : virDomainObjUnref:1645 : obj=0x1c00cd0 refs=3 2012-05-17 21:22:30.250+0000: 16926: debug : virDomainMigrateBegin3:6173 : xml (null) 2012-05-17 21:22:30.250+0000: 16926: debug : virDomainFree:2345 : dom=0x1d7ee30, (VM: name=testvm, uuid=feb7ccb6-1087-8661-9284-62e3a1e9f44a) 2012-05-17 21:22:30.250+0000: 16926: debug : virUnrefDomain:276 : unref domain 0x1d7ee30 testvm 1 ---snip--- Also there is a second point - libvirt doesn`t allow migration of VM until all snapshots has been deleted, which is not necessary for network filesystems, so it probably needs to be fixed. Thanks!

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Re: [libvirt-users] How to use Python Binding with Lbivirt.
by Hubert Zhang 19 May '12

19 May '12

When I run the python test code I got the SASL error. But it's ok if I run the C sample code. Do you know the reason? Here is the message: libvir: RPC error : authentication failed: Failed to start SASL negotiation: -4 (SASL(-4): no mechanism available: No worthy mechs found) Traceback (most recent call last): File "esxList.py", line 101, in ? conn = libvirt.openAuth(uri, auth, 0) File "/usr/lib/python2.4/site-packages/libvirt.py", line 102, in openAuth if ret is None:raise libvirtError('virConnectOpenAuth() failed') libvirt.libvirtError: authentication failed: Failed to start SASL negotiation: -4 (SASL(-4): no mechanism available: No worthy mechs found) Thanks, -Hubert

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[libvirt-users] USB passthrough of all USB-slots to guest
by eGerlach 18 May '12

18 May '12

Hi, how can I define passthrough of all USB-slots to a guest with libvirt? With qemu it's very easy: # kvm -usb -usbdevice host:0.* -usbdevice host:1.* -usbdevice host:2.* -usbdevice host:3.* ... This configuration of the VM gets *all* 4 USB-Slots. Every time somewhat USB-device is plugged in the VM gets it. virt-install manpage offers: --host-device 001.003 USB by bus, device (via lsusb). I installed a VM with option --host-device 001.001 according to output of lsusb. The XML-file generated: <hostdev mode='subsystem' type='usb' managed='yes'> <source> <vendor id='0x1d6b'/> <product id='0x0002'/> </source> </hostdev> But no USB device is passed through automatically. I always need virsh attach-device virtualM myusb.xml with exact vendor and product ID. I want to plug in somewhat USB-Stick or other USB stuff without exploring vendor and product id before. Who can help? tia Ekkard

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[libvirt-users] lxc: Add /dev/tty to lxcContainerPopulateDevices() ?
by Sukadev Bhattiprolu 18 May '12

18 May '12

Hi, src/lxc/lxc_container.c:lxcContainerPopulateDevices() has this table of devices that are automatically created when an lxc container is started. const struct { int maj; int min; mode_t mode; const char *path; } devs[] = { { LXC_DEV_MAJ_MEMORY, LXC_DEV_MIN_NULL, 0666, "/dev/null" }, { LXC_DEV_MAJ_MEMORY, LXC_DEV_MIN_ZERO, 0666, "/dev/zero" }, { LXC_DEV_MAJ_MEMORY, LXC_DEV_MIN_FULL, 0666, "/dev/full" }, { LXC_DEV_MAJ_MEMORY, LXC_DEV_MIN_RANDOM, 0666, "/dev/random" }, { LXC_DEV_MAJ_MEMORY, LXC_DEV_MIN_URANDOM, 0666, "/dev/urandom" }, }; Can we add '/dev/tty' to this list ? We were trying to run 'smbpasswd -a user' inside a container without /dev/tty and the fopen("/dev/tty", "w+") in smbpasswd made /dev/tty a regular file, breaking man(1), less(1), and ofcourse smbpasswd :-) Sure we can add /dev/tty to container's rc.local or something, but wouldn't it be in the same category as say, /dev/null or /dev/zero ? Sukadev

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[libvirt-users] Using virsh to connect to ESX
by Mauro Monteiro 17 May '12

17 May '12

Hello All, I have just started studying the libvirt and I am trying to connect to ESX Server (version 4) using virsh (version 0.7.5) using the following command: virsh -c esx+ssh://root@<fully qualified hostname)> It inquires the root password and as soon as I inform the password it throws the error: error: cannot recv data: Connection reset by peer error: failed to connect to the hypervisor I can access my server using ssh. I am running it from Ubuntu 10.04 and the libvirt version 0.7.5. Can someone help me? -- []'s Mauro

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[libvirt-users] Python 3.2 support for libvirt API?
by Patrick Wilbur 17 May '12

17 May '12

Hey all, I apologize if this has been asked many times already (new to the list). I'm trying to write a Python script that makes use of the libvirt API, and I'm trying my best to make the script both Python 2.x and 3.x compatible. Is the libvirt module available for Python 3.x yet, and, if so, what is the module name that I need to import? What is the package name to install on my OS (Ubuntu 11.10)? Thanks in advance, Pat Wilbur -- Patrick F. Wilbur Researcher, Consultant, Educator, Computer Science Graduate at Clarkson University patrick.wilbur(a)gmail.com wilburpf(a)clarkson.edu Check out our book: http://runningxen.com Consulting: http://pfwilbur.com My website: http://pdub.net

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[libvirt-users] libvirt, lxc, "/dev/log" ENOENT
by dennis jenkins 15 May '12

15 May '12

Hello. I am experimenting with LXC via libvirt on my Gentoo development system. I can start the LXC domain and connect to its console. However, I am unable to login as root. I've used "chroot" and "passwd" from the host system to explicitly set the root password. Still no luck. So I began debugging.... I ran "strace" on the container's "login" process (after agetty exec'd login). I noticed that it was unable to open "/dev/log". Sure enough the unix domain socket did not exist inside the container (as seen from outside the container). So I tweaked my host's syslog-ng.conf file to create this socket. My hope was to monitor the log events generated by the login process. So the log device certainly exists (and it tests ok with the 'logger' command): The LXC file-system was created with the "lxc-gentoo" script ( http://lxc-gentoo.sourceforge.net/) The only changes that I've made to the container's file system is to change roots' password ($rootfs/etc/shadow) and configure syslog-ng to create a logging socket at $rootfs/dev/log. I've even edit "$rootfs/etc/shadow" and completely removed root's password hash. I still can't log into the account from "virsh console". I thought that maybe I was unable to authenticate because the "login" process cannot log success/failure to /dev/log. However, I know from experience that on other Gentoo systems I can login as root even when syslog-ng is kaput, and /dev/log does not exist. "/etc/pam.d" inside the container is byte-for-byte the same as my host system, and I can authenticate as root from the physical console. I have a few main questions: 1) Is my domain configured correctly? 2) Why is the container unable to write to the "/dev/log" provided from outside the container? 3) Why am I unable to authenticate as the "root" user? Thank you for your time. ostara ~ # virsh -c lxc:/// start dwj-lnx-dev Domain dwj-lnx-dev started ostara ~ # virsh -c lxc:/// console dwj-lnx-dev Connected to domain dwj-lnx-dev Escape character is ^] INIT: version 2.88 booting Gentoo Linux; http://www.gentoo.org/ Copyright 1999-2009 Gentoo Foundation; Distributed under the GPLv2 Press I to enter interactive boot mode * Skipping mount of /proc as it's already mounted * Skipping mount of /sys as it's already mounted * Using existing device nodes in /dev ... [ ok ] * Skipping mount of /dev/pts as it's already mounted * Remounting root filesystem read-only ... mount: / is busy [ !! ] * Skipping root filesystem check (fstab's passno == 0) ... [ ok ] * Checking all filesystems ... [ ok ] * Mounting local filesystems ... mount: mount point /dev/shm does not exist * Some local filesystem failed to mount [ !! ] * Mounting USB device filesystem (usbfs) ... [ ok ] * Activating (possible) swap ... [ ok ] * Setting system clock using the hardware clock [UTC] ... [ ok ] * Configuring kernel parameters ... error: "Read-only file system" setting key "net.ipv4.conf.default.rp_filter" error: "Read-only file system" setting key "net.ipv4.conf.all.rp_filter" [ ok ] * Cleaning /var/lock, /var/run ... [ ok ] * Wiping /tmp directory ... [ ok ] * Starting lo * Bringing up lo * 127.0.0.1/8 [ ok ] * Adding routes * 127.0.0.0/8 ... [ ok ] INIT: Entering runlevel: 3 * Starting eth0 * Bringing up eth0 * 192.168.2.199 [ ok ] * Adding routes * default via 192.168.2.1 ... [ ok ] * Mounting network filesystems ... [ ok ] /lib64/rcscripts/sh/rc-services.sh: line 412: /etc/init.d/udev-postmount: Permission denied * Starting local ... [ ok ] This is ostara.unknown_domain (Linux x86_64 3.2.12-gentoo) 23:06:09 ostara login: ostara ~ # virsh -c lxc:/// version Compiled against library: libvir 0.9.11 Using library: libvir 0.9.11 Using API: LXC 0.9.11 Running hypervisor: LXC 3.2.12 ostara ~ # ls -l /vm/lxc/dwj-lnx-dev/dev/log srw-rw-rw- 1 root root 0 May 14 17:31 /vm/lxc/dwj-lnx-dev/dev/log ostara ~ # logger -s /vm/lxc/dwj-lnx-dev/dev/log "CAPYBARA" djenkins: /vm/lxc/dwj-lnx-dev/dev/log CAPYBARA ostara ~ # tail -n 100 /var/log/messages | grep CAPYBARA May 14 17:58:57 localhost djenkins: /vm/lxc/dwj-lnx-dev/dev/log CAPYBARA (lots of strace setup omitted): Buried about 60% down in the strace output is the attempt by "login" inside the container to access "/dev/log", which failed (ENOENT). open("/etc/passwd", O_RDONLY|O_CLOEXEC) = 3 lseek(3, 0, SEEK_CUR) = 0 fstat(3, {st_mode=S_IFREG|0644, st_size=720, ...}) = 0 mmap(NULL, 720, PROT_READ, MAP_SHARED, 3, 0) = 0x7fc6ccb66000 lseek(3, 720, SEEK_SET) = 720 munmap(0x7fc6ccb66000, 720) = 0 close(3) = 0 time([1337035715]) = 1337035715 socket(PF_FILE, SOCK_DGRAM|SOCK_CLOEXEC, 0) = 3 connect(3, {sa_family=AF_FILE, path="/dev/log"}, 110) = -1 ENOENT (No such file or directory) close(3) = 0 fstat(1, {st_mode=S_IFCHR|0600, st_rdev=makedev(136, 0), ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fc6ccb66000 write(1, "\n", 1) = 1 write(1, "Login incorrect\n", 16) = 16 time(NULL) = 1337035715 This is my domain config: ostara ~ # virsh -c lxc:/// dumpxml dwj-lnx-dev <domain type='lxc'> <name>dwj-lnx-dev</name> <uuid>fbcd8c3a-9939-12b4-727d-5d3526bc448f</uuid> <memory unit='KiB'>500000</memory> <currentMemory unit='KiB'>500000</currentMemory> <vcpu>2</vcpu> <os> <type arch='x86_64'>exe</type> <init>/sbin/init</init> </os> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/libexec/libvirt_lxc</emulator> <filesystem type='mount' accessmode='passthrough'> <source dir='/vm/lxc/dwj-lnx-dev'/> <target dir='/'/> </filesystem> <interface type='bridge'> <mac address='52:54:00:3e:d9:7c'/> <source bridge='br0'/> </interface> <console type='pty'> <target type='lxc' port='0'/> </console> </devices> </domain>

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[libvirt-users] Script execution at Boot
by vipul borikar 14 May '12

14 May '12

I am using KVM on RHEL 6.1. When i try to run a RHEL 5.5 Guest using virt-manager the a shell script put under rc.local runs properly. But when i try to run Guest using cmd line the script doesn't run. I mean it gives error code as 1 . The commands like echo works but executing another shell script under rc.local file doesn't run and gives return code as 1. I know its weird question .. but just was curious is there any parameter in xml file which affects the environment of the boot sequence ??? I can give the both the xml file if needed. -- Thanks Vipul Borikar "Our task must be to free ourselves...by widening our circle of compassion to embrace all living creatures and the whole of nature and its beauty."

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[libvirt-users] Permission issue with cgroups
by Antonio Carlos Salzvedel Furtado Junior 12 May '12

12 May '12

Hello libvirt users, I'm using the cgroup with QEMU guests. At /etc/libvirt/qemu.conf, I have the following parameter: cgroup_controllers = [ "cpu" ] This controller is successfully mounted and libvirt is able to create subgroups for each VM, it's really great the cgroups support in libvirt. The problem is that I can only set the parameters of a given cgroup under the cpu controller if I'm logged in as root. I want another user to have that permission as well. I tried to modify the file /etc/cgconfig.conf to change the permissions. The file is exactly this: group libvirt { perm { admin { uid = opennebula; gid = opennebula; } task { uid = root; gid = root; } } cpu { cpu.shares=512; } } This configuration above does not seem to modify any of the administration permissions. Only the root can edit the parameters under libvirt. The cpu entry was added just to check whether this configuration was read by cgroups at all. The 'cpu.shares' does change in group libvirt. I was careful to start libvirt only after the service cgconfig was restarted. Thanks in advance, Antonio Carlos Furtado

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[libvirt-users] libvirtd fails to start on f16 64bit
by Chad Roberts 12 May '12

12 May '12

Hello, For quite some time, my libvirtd was working great. I came back today to fire-up a VM, but noticed that libvirtd was not running. When I try to start it, I get the following error... libvirtd: symbol lookup error: libvirtd: undefined symbol: avahi_client_new Can anyone shed some light on what my problem may be? Thanks, Chad

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