- Users - libvirt List Archives

[libvirt-users] prefer_msi=on in xml file
by klak2 23 Sep '12

23 Sep '12

Hello, here is a problem with KVM passthrough of TechnoTrend S2-6400. Bug report is done. The last answer of the debian maintainer: --> Please check with lspci -vv whenever your device is MSI-capable, --> and if yes, try to add prefer_msi=on to the pci-assign device --> argument -- like, from your original report, --> --> -device pci- assign,host=08:00.0,id=hostdev0,configfd=23,bus=pci.0,addr=0xa,prefer_msi=on --> --> I don't know how to add this to libvirt however, maybe they have --> some knobs for that nowadays. and now my question: How do I add the parameter "prefer_msi=on" to the xml file? Thank and greets klak2

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[libvirt-users] sharing read-only LOCAL disks among KVM guests
by Amos Shapira 23 Sep '12

23 Sep '12

Hello, Is it possible to share a single host's Logical Volume among multiple local KVM guests which mount it read-only? I'm asking this because I have an idea to run multiple idential KVM guests (they all have exactly the same software installed on them), booting them from a shared local Logical Volume read-only root file system, or alternatively let them share the bulk of the software (/usr, /opt, /lib) from a common KVM host Logical volume. Is this possible? All my searches so far failed to turn up anything like this. Would it be possible using qcow2 instead of raw LV? If so - would it be worth the performance hit of switching from LV to qcow2? The motivation for this is two-fold: 1. Speed-up - I suspect that sharing the same disk block among all KVM agents (we currently have 14 KVM guests on each server) should lead to better cache utilisation and reduce disk access. Also the cost of maintaining the mutiple identical servers and keeping them up to date could be eating into our server's resource usage. 2. Maintenance - if I get to share the common disk image among all of them then I only need to install/update it once instead of once for each KVM guest (we already use Puppet but it doesn't mean it comes for free). Thanks, --Amos

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[libvirt-users] picking a NUMA cell for pinning using virsh freecell
by Edoardo Comar 21 Sep '12

21 Sep '12

Hi I'd want to pin the vcpu of a guest to a pcpu. the docs clearly say https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/6/h… "Locking a guest to a particular NUMA node offers no benefit if that node does not have sufficient free memory for that guest. libvirt stores information on the free memory available on each node. Use the virsh freecell --all command to display the free memory on all NUMA nodes " I have tried to look at what freecell returns and heuristically its total across cells looks roughly the same value returned by the 'free' command but without discounting buffers and cache. While free is able to show the value when buffers/cache are taken into account, free is not able to apportion that to NUMA cells. So is it really a valid strategy to choose the NUMA cell for pinning vcpus looking at virsh freecell or ideally we'd need those values adjusted with buffers+cache ? And if so how could one do that ? -------------------------------------------------- regards, Edoardo Comar IBM SWG UK - Hursley JTC ecomar(a)uk.ibm.com Tel +44 (0)1962 81 5576 (external) 245576 (internal) IBM UK Ltd, Hursley, SO21 2JN Unless stated otherwise above: IBM United Kingdom Limited - Registered in England and Wales with number 741598. Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU

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[libvirt-users] virsh list not working with xen 4
by Rogério Vinhal Nunes 21 Sep '12

21 Sep '12

Hi, I'm having some trouble to get libvirt to show the correct power state of my virtual machines. I'm using Ubuntu 10.04 + Xen 4.1.1 + libvirt 0.8.8. virsh list --all only shows turned off machines registered in xend. If I turn them on, they just "disappear", and when I start machines directly from xml, they just doesn't appear at all. Libvirt is correctly connecting to xen as I can use the other commands fine, just the list option doesn't seem to work at all. What can I do to change that? # virsh version Compiled against library: libvir 0.8.8 Using library: libvir 0.8.8 Using API: Xen 3.0.1 Running hypervisor: Xen 4.1.0

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[libvirt-users] Xen domains appear randomly
by Mathias Gaunard 21 Sep '12

21 Sep '12

Hi, I have a problem with libvirt or at least with virt-manager and virsh. I have created Xen domains with them, and they do exist and are running without problems, which I can attest by using Xen native tools. However, depending on how I can connect to the machine (direct xen, xen+ssh), and depending on the user I log in as, I may or may not see the domains, or I may or may not be able to configure storage. I am running Debian Wheezy and using the libvirt version from the repositories. Any idea of how I could try to troubleshoot this problem?

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[libvirt-users] Network inoperable with QEMU arm example image
by Larry Brown 21 Sep '12

21 Sep '12

Is this thing on? I posted the message below twice now with no response by anyone. Can someone tell me what I'm doing wrong or at least let me know this is not something they've ever seen so I know my posts are being viewed by those in the know? I'll try replicating the install process on another machine with hopes it will work there, but this is my desktop and I'd really like to have it run here rather than running a separate machine just to run the VM in. (That is provided it will run anywhere using these installation mechanisms) "I am running Fedora 16 64bit and installed libvirt. I have the VM running with arm emulation with this one issue I can't figure out. I used Virtual Machine Manager to manage the VM and can access its console there. The Ethernet appears to be eth1 and the guest can set an IP on it etc. However, I cannot see any traffic from the Host when dumping any of the interfaces. I've tried several combinations of network setups using the GUI and none appear to work. Optimally I'd like to bridge to my primary interface (em1) and be able to pull an address and talk directly to my network so I can download packages etc while in the VM. I tried setting up networking in that fashion with: Source Device : em1 with macvtap Device Model: Hypervisor Default Source Mode: Bridge but alas I cannot pull dhcp nor can I set a static address and ping other interfaces on the network. It also appears that every time I start the VM it creates another vnetX interface. One of the troubleshooting pages I came across listed all the tools but nothing about what to look for: 1) virsh net-list --all Name State Autostart ----------------------------------------- default active yes 2) brctl show bridge name bridge id STP enabled interfaces virbr0 8000.52540029e6c7 yes virbr0-nic vnet0 vnet1 vnet2 vnet3 vnet4 3) sysctl net.bridge.bridge-nf-call-iptables sysctl net.bridge.bridge-nf-call-iptables = 1 4) iptables -L -v -n Chain INPUT (policy ACCEPT 767K packets, 189M bytes) pkts bytes target prot opt in out source destination 0 0 ACCEPT udp -- virbr0 * 0.0.0.0/0 0.0.0.0/0 udp dpt:53 0 0 ACCEPT tcp -- virbr0 * 0.0.0.0/0 0.0.0.0/0 tcp dpt:53 0 0 ACCEPT udp -- virbr0 * 0.0.0.0/0 0.0.0.0/0 udp dpt:67 0 0 ACCEPT tcp -- virbr0 * 0.0.0.0/0 0.0.0.0/0 tcp dpt:67 Chain FORWARD (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination 0 0 ACCEPT all -- * virbr0 0.0.0.0/0 192.168.122.0/24 state RELATED,ESTABLISHED 0 0 ACCEPT all -- virbr0 * 192.168.122.0/24 0.0.0.0/0 0 0 ACCEPT all -- virbr0 virbr0 0.0.0.0/0 0.0.0.0/0 0 0 REJECT all -- * virbr0 0.0.0.0/0 0.0.0.0/0 reject-with icmp-port-unreachable 0 0 REJECT all -- virbr0 * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-port-unreachable Chain OUTPUT (policy ACCEPT 532K packets, 79M bytes) pkts bytes target prot opt in out source destination 5) ps -ef | grep dnsmasq nobody 12382 1 0 Sep11 ? 00:00:00 /usr/sbin/dnsmasq --strict-order --bind-interfaces --pid-file=/var/run/libvirt/network/default.pid --conf-file= --except-interface lo --listen-address 192.168.122.1 --dhcp-range 192.168.122.2,192.168.122.254 --dhcp-leasefile=/var/lib/libvirt/dnsmasq/default.leases --dhcp-lease-max=253 --dhcp-no-override 6) ifconfig -a em1 Link encap:Ethernet HWaddr 00:19:B9:48:2B:BA inet addr:10.45.212.46 Bcast:10.45.212.255 Mask:255.255.255.0 inet6 addr: fe80::219:b9ff:fe48:2bba/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:19048593 errors:95686 dropped:154 overruns:0 frame:98437 TX packets:10619346 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:12559170813 (11.6 GiB) TX bytes:1700214519 (1.5 GiB) Interrupt:16 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:2978074 errors:0 dropped:0 overruns:0 frame:0 TX packets:2978074 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:847201395 (807.9 MiB) TX bytes:847201395 (807.9 MiB) macvtap0 Link encap:Ethernet HWaddr 52:54:00:AC:7F:0C inet6 addr: fe80::5054:ff:feac:7f0c/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:294814 errors:0 dropped:0 overruns:0 frame:0 TX packets:6 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:42804350 (40.8 MiB) TX bytes:468 (468.0 b) virbr0 Link encap:Ethernet HWaddr 52:54:00:29:E6:C7 inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0 UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:621 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:43217 (42.2 KiB) virbr0-nic Link encap:Ethernet HWaddr 52:54:00:29:E6:C7 BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) vnet0 Link encap:Ethernet HWaddr FE:54:00:AC:7F:0C BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:38159 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:0 (0.0 b) TX bytes:1995337 (1.9 MiB) vnet1 Link encap:Ethernet HWaddr FE:54:00:AC:7F:0C BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:37299 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:0 (0.0 b) TX bytes:1949439 (1.8 MiB) vnet2 Link encap:Ethernet HWaddr FE:54:00:AC:7F:0C BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:36154 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:0 (0.0 b) TX bytes:1888745 (1.8 MiB) vnet3 Link encap:Ethernet HWaddr FE:54:00:AC:7F:0C BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:35068 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:0 (0.0 b) TX bytes:1832375 (1.7 MiB) vnet4 Link encap:Ethernet HWaddr FE:54:00:AC:7F:0C BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:207 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:0 (0.0 b) TX bytes:10896 (10.6 KiB) 7) cat /proc/sys/net/ipv4/ip_forward 1 Any help I can get to resolve this would be greatly appreciated. Very frustrating... Larry

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[libvirt-users] Article about libvirt and audit subsystem
by Marcelo Cerri 21 Sep '12

21 Sep '12

Hi, Sometime ago I wrote an article about libvirt describing how the Linux audit subsystem can be used to track qemu guest's life-cycle. I think this is a topic that can be useful for many people here and so I'm forwarding the URL: http://www.ibm.com/developerworks/linux/library/l-kvm-libvirt-audit/index.h… Regards, Marcelo Cerri

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Re: [libvirt-users] How to pass info to a guest?
by Renich Bon Ciric 20 Sep '12

20 Sep '12

On Thu, Sep 20, 2012 at 12:09 PM, Andrew Cathrow <acathrow(a)redhat.com> wrote: > So you really want to run apt commands on fedora ;-) > > ssh stuff should work fine for you. LOL, ok, you're right. Anyway, thinking it over, I need to apply these injections every time I boot. If the user updates his/her VNC password or rsa-id.pub file on the outside, I need it synced on the inside.

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[libvirt-users] How to pass info to a guest?
by Renich Bon Ciric 20 Sep '12

20 Sep '12

Hello, I would love to be able to pass information to a Guest. For example: - I'd love to sync the root password with the VNC/Spice one - I'd like to be able to inject stuff to /root/.ssh/authorized_keys All of these at boot time. How would I do it? I'd make these files/strings available in the BIOS or something; maybe some kind of storage local to the host and guest as well. Then, I'd create a systemd script that checks these and syncs stuff @ reboot time. I don't know how to make this local storage available or if it is doable to insert this info into some BIOS string; obtainable with dmidecode or something. It would be awesome if this could be dynamic as well. Any feedback is appreciated! -- It's hard to be free... but I love to struggle. Love isn't asked for; it's just given. Respect isn't asked for; it's earned! Renich Bon Ciric http://www.woralelandia.com/ http://www.introbella.com/

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[libvirt-users] How to migrate over TCP without certs
by Renich Bon Ciric 20 Sep '12

20 Sep '12

Hey guys, I have a private network and I trust it! /me hides behind trees... So, in order to exercise my trust, I wanna migrate guests over TCP; with and without shared storage. This is: - I want to migrate from host1 to host2; which have shared storage; over TCP without certs - I want to migrate from host1 to host99, which don't have shared storage, over TCP without certs I am asking because, every time I try anythng, it complains: error: Cannot read CA certificate '/etc/pki/CA/cacert.pem': No such file or directory If I need to setup this cacert, no problem; point me to it! Anyway, thank you for taking the time to read this email. Fedora 17 x86_64 libvirt-0.9.11.5-3.fc17.x86_64 qemu-kvm-1.0.1-1.fc17.x86_64 private network on vlan2, Dual 10 Gbps bonded (20, perhaps?) -- It's hard to be free... but I love to struggle. Love isn't asked for; it's just given. Respect isn't asked for; it's earned! Renich Bon Ciric http://www.woralelandia.com/ http://www.introbella.com/

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