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Re: [libvirt-users] [virt-tools-list] live-migrating a VM whose current host's storage is fubar'ed
by Cole Robinson 17 Apr '14

17 Apr '14

On 04/15/2014 05:16 PM, Digimer wrote: > Hi all, > > For those on the linux-cluster list, this is a similar question to my > post[1] there. > > I recently had a client destroy their node's RAID array (they yanked hard > drives until the array was destroyed). The VMs running on the node continued > to operate for another hour, impressively. Their storage was based on DRBD, so > the VM's storage just started going to/from the other node's storage. > > The problem was when I tried to migrate them off of the damaged node to a > healthy node. Without being able to write to the logs (I assume), the > migration failed. In the end, I had to force-off the damaged host and reboot > the VMs on the backup node. This caused an outage which, I think, could have > been avoided. > > So my question is; Can VMs be migrated if/when the host's FS is > read-only/destroyed? If so, how? > > Thanks! > > 1. https://www.redhat.com/archives/linux-cluster/2014-April/msg00010.html > Probably a better question for libvirt lists, CCd, but I don't think anyone tests a scenario like that so there's bound to be problems. - Cole

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[libvirt-users] LXC vCPU controlling problem
by Xingjun Wang 16 Apr '14

16 Apr '14

Hi,guys! I've been using libvirt-1.1.1 with LXC1.0.0 to do my CS homework.But I met a problem when I tried to set vcpu for a LXC.The /sys/fs/cgroup/cpuset/machine/cpuset.cpus always show 0-3 no matter how many vcpu I defined in the XML setting file. But I found the command "virsh -c lxc:/// domaininfo lxc_name" got the right number as it is defined. What's the problem there? Is it a bug in libvirt-1.1.1? Thank you!

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Re: [libvirt-users] LXC + USB passthrough = Operation not permitted
by WANG Cheng D 15 Apr '14

15 Apr '14

Dear Fil, I am not sure if my answer can help you. I had ever asked a similar question to Daniel and I was using a thirty-party card. As a container uses a shared kernel with the host, so hostdev mode='subsystem' doesn't make sense. Maybe you can try to use hostdev mode='capabilities'. Please see http://libvirt.org/formatdomain.html#elementsHostDevCaps Hope this helps Cheng Wang

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[libvirt-users] Changing dnsmasq DNS settings for virtual machines
by Johannes Kastl 15 Apr '14

15 Apr '14

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi everyone, maybe this is an old fart, but I cant get it to work. I am running libvirt on a laptop, where a dnsmasq is already running to delegate dns info for my local (not-public) network. My resolv.conf (on the host) lists the system-dnsmasq as first server. I had to set the listen-adress for the system-dnsmasq to 127.0.0.1 and set bind-interfaces, to stop if from binding to all interfaces and overriding the libvirtd-dnsmasq, which also has dhcp enabled. Now, how can I tell the libvirtd-dnsmasq, to use the system-dnsmasq as first nameserver? I found lots of pages when searching for "libvirt dns", but all of them only show the dhcp-part of the network's xml file: http://wiki.libvirt.org/page/VirtualNetworking#DNS_.26_DHCP > <ip address="192.168.122.1" netmask="255.255.255.0"> <dhcp> <range > start="192.168.122.100" end="192.168.122.254" /> <host > mac="00:16:3e:e2:ed" name="foo.example.com" ip="192.168.122.10" /> > </dhcp> </ip> One possible workaround: My system-dnsmasq reads /etc/hosts_whatever, and apparently the libvirtd-dnsmasq reads var/lib/libvirt/dnsmasq/NETWORK_NAME.addnhosts. I could copy my hosts_whatever in that place, but I had to configure the libvirtd-dnsmasq what my local domains are. Which brings me to the next question: How to set the addn-hosts= for the libvirtd-dnsmasq in the xml file? Regards, Johannes - -- A good sermon should be like a woman's skirt: short enough to arouse interest but long enough to cover the essentials. (Ronald Knox) -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) Comment: Using GnuPG with SeaMonkey - http://www.enigmail.net/ iEYEARECAAYFAlNA5zMACgkQzi3gQ/xETbJBVACeLV9j/TDxgnImAsyEtotUBJ2J OD0An2WDBWUoqCUvmoquk4pwoKplfu/T =g6YM -----END PGP SIGNATURE-----

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[libvirt-users] Is it possible to get the vm which is using a storage pool's volume?
by Pasquale Dir 14 Apr '14

14 Apr '14

Hello, how can I programmatically get the vm which is currently using a storage volume? I looked at the apis but I can't find anything about it. Pasquale

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[libvirt-users] libvirt and glusterfs integrate problem
by lyz_pro 14 Apr '14

14 Apr '14

Hi everyone I have a problem when use libvirt and glusterfs. When I use libvirt to start a vm with glusterfs disk. the operation will block. after I `CTL + c` the 'virsh start domainxx' comand , I use `virsh list` will find the vm in a strange state, kind like follow: Id Name State ---------------------------------------------------- 20 vm10 shut off and I when I start the vm again, It will promote the vm is in active. the xml as follow (172.16.32.16 is a glusterfs node): <domain type='kvm' id='20'> <name>vm10</name> <uuid>12208c14-3990-c134-2653-8a828ff1eb1d</uuid> <memory unit='KiB'>1048576</memory> <currentMemory unit='KiB'>1048576</currentMemory> <vcpu placement='static'>4</vcpu> <resource> <partition>/machine</partition> </resource> <os> <type arch='x86_64' machine='rhel6.5.0'>hvm</type> <boot dev='hd'/> </os> <features> <acpi/> <apic/> <pae/> </features> <clock offset='localtime'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/libexec/qemu-kvm</emulator> <disk type='network' device='disk'> <driver name='qemu' type='qcow2'/> <source protocol='gluster' name='h2216v5/tmp/vm10.img'> <host name='172.16.32.16'/> </source> <target dev='hda' bus='ide'/> <alias name='ide0-0-0'/> <address type='drive' controller='0' bus='0' target='0' unit='0'/> </disk> <controller type='usb' index='0'> <alias name='usb0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/> </controller> <controller type='ide' index='0'> <alias name='ide0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/> </controller> <controller type='pci' index='0' model='pci-root'> <alias name='pci.0'/> </controller> <interface type='bridge'> <mac address='00:0c:29:2f:aa:b1'/> <source bridge='virbr0'/> <target dev='vnet91'/> <model type='rtl8139'/> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> <input type='mouse' bus='ps2'/> <graphics type='vnc' port='5991' autoport='yes' listen='172.16.32.3' keymap='en-us'> <listen type='address' address='172.16.32.3'/> </graphics> <video> <model type='cirrus' vram='9216' heads='1'/> <alias name='video0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </video> <memballoon model='virtio'> <alias name='balloon0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </memballoon> </devices> <seclabel type='none'/> </domain> Also: I can use `qemu-kvm` command to start vm successful with gluster://172.16.32.16 I have stop both nodes' iptables. and my libvirt and qemu version is : Compiled against library: libvirt 1.1.4 Using library: libvirt 1.1.4 Using API: QEMU 1.1.4 Running hypervisor: QEMU 1.6.2 glusterfs-3.4.1-3.el6.x86_64 -------------- lyz_pro 2014-04-14

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[libvirt-users] libvirt Java - vmware (esx driver)
by Mihai Cazacu 14 Apr '14

14 Apr '14

Hi, I'm trying to connect to a VMware vCenter Server (Version 5.0.0 Build 1300600) using this code: class CustomConnectAuth extends ConnectAuth { > CustomConnectAuth() { > // credType = ... // ... > } > @Override > int callback(Credential[] cred) { > // ... > return 0 > } > } > ConnectAuth auth = new CustomConnectAuth() > Connect conn = new Connect("esx://USERNAME@HOSTNAME/sdk?no_verify=1", > auth, 0) and I've got this error message: libvirt: error : unsupported configuration: *libvirt was built without the > 'esx' driver* If I use the vijava client, the connection works fine. ServiceInstance serviceInstance = new ServiceInstance(new URL(" > https://HOSTNAME/sdk"), USERNAME, PASSWORD, true) ... Some environment info: os: Ubuntu 13.10 > jdk: 1.7.0_51-b13 > Java client: org.libvirt:libvirt:0.5.1 Can you help, please? Thanks, Mihai -- Mihai Cazacu Software Engineer E-mail: cazacugmihai(a)gmail.com Mobile: +40 745 254 657 Linkedin: cazacugmihai <http://www.linkedin.com/in/cazacugmihai> Skype: cazacugmihai Twitter: cazacugmihai

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[libvirt-users] Setting elevator=noop in the guest necessary?
by Johannes Kastl 14 Apr '14

14 Apr '14

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi everyone, I found an article about libvirt, and one thing that I have not seen anywhere else: > IMPORTANT: If you boot a Linux VM, you might want to add > “elevator=noop” to your Linux boot command line to force the disk > scheduler to let the host machine handle the disk writes > reorganisations (like tunnelling tcp over tcp, it is bad to have > two schedulers trying to do each other’s job). For example, on > GRUB2 on Debian, you have to append “elevator=noop” after > GRUB_CMDLINE_LINUX in /etc/default/grub. (from http://blog.normation.com/en/2012/03/09/a-guide-to-the-everyday-use-of-libv…) Is this necessary? Or is this even a good idea? Is this outdated? Or does it depend on the kind of hypervisor (XEN, KVM,...)? The few qemu/KVM-machines I have tested did work fine without this, although at this point I just set them up and did a few program installations, no real 'workload'. Thanks in advance. Regards, Johannes - -- ...Unix, MS-DOS, and Windows NT (also known as the Good, the Bad, and the Ugly). (Matt Welsh) -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 Comment: Using GnuPG with SeaMonkey - http://www.enigmail.net/ iEYEARECAAYFAlNK5UUACgkQzi3gQ/xETbK9jQCePXXY87HpDrufk8tKvaI+JhR9 uGQAoJjxU/B8Z8sGvQS/iPUZNsQtM/Il =sjGR -----END PGP SIGNATURE-----

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[libvirt-users] libvirt: error : internal error: cannot apply process capabilities -1
by Santhosh Kokala 11 Apr '14

11 Apr '14

Hi All, I am running libvirt-1.1.2 on Scientific Linux release 6.1 (Carbon). I compiled the libvirtd rpms and installed them on to my system. I see this error 2014-04-11 05:37:42.351+0000: 12378: error : virCommandWait:2348 : internal error: Child process (LC_ALL=C PATH=/sbin:/usr/sbin:/bin:/usr/bin /usr/libexec/qemu-kvm -help) unexpected exit status 1: libvirt: error : internal error: cannot apply process capabilities -1 Whenever libvirtd restarts. Because of this error I also cannot create a domain with os_type set to "hvm". Virsh capabilities also does not list this os_type. Can someone let me if I am missing something obvious? Santhosh

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[libvirt-users] Help with understanding and solving snapshot problem
by rolf 11 Apr '14

11 Apr '14

Hello Fairly new to libvirt. I’m hoping to both solve a problem with this question as well as learn more detail about how libvirt works. Using RHEL 6.4 and libvirt version is 0.10.2 and qemu-img version is 0.12.1.2 Using virt-manager I created a VM. Nothing unusual as far as I can see. I then added a disk. So I have a second virtio based volume which the guest then mounts as a separate filesystem. At some stage after that I created a snapshot of the system. I can’t delete the snapshot. The end result is I’d like to create a snapshot that excludes the second (much larger) disk - that is backed up via conventional backup systems. But the issue is first deleting the snapshot and my understanding of what its saying. So here is some basic info: # virsh snapshot-list host1 Name Creation Time State ------------------------------------------------------------ snap1-host1 2014-01-19 16:59:10 +1100 shutoff # # virsh snapshot-info host1 --current Name: snap1-host1 Domain: host1 Current: yes State: shutoff Location: internal Parent: - Children: 0 Descendants: 0 Metadata: yes So I try and delete it: # virsh snapshot-delete host1 --current error: Failed to delete snapshot snap1-host1 error: unsupported configuration: deletion of 1 external disk snapshots not supported yet Why does it say “external” in the above error, when the snapshot-info says its Location is internal? Are they not related ideas? The img file /var/lib/libvirt/images/host1.img is not being used by KVM. the snapshot files are in use instead: # virsh domblklist host1 Target Source ------------------------------------------------ vda /var/lib/libvirt/snap1-host1.qcow2 vdb /var/lib/libvirt/snap1-host1-db.qcow2 hdc - Querying them: # qemu-img info /var/lib/libvirt/snap1-host1.qcow2 image: /var/lib/libvirt/snap1-host1.qcow2 file format: qcow2 virtual size: 24G (25769803776 bytes) disk size: 3.5G cluster_size: 65536 [root@cocoa libvirt]# qemu-img info /var/lib/libvirt/snap1-host1-db.qcow2 image: /var/lib/libvirt/snap1-host1-db.qcow2 file format: qcow2 virtual size: 1.6T (1800279089664 bytes) disk size: 325G cluster_size: 65536 What have I done wrong and how can I correct this so I can discard the existing snapshot and have a snapshot of the system excluding the second disk (and optionally which I can re-take at intervals and discard old ones)? Many thanks, rolf.

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