virt November 2010

virt@lists.fedoraproject.org

31 participants
23 discussions

Re: [fedora-virt] Routing to guests
by Robert Thiem 15 Jan '12

15 Jan '12

> From: Philip Rhoades > I can ssh from/to the host/guest OK but how do I set up a route (or > whatever is necessary) so that another machine: > eth0: 192.168.0.12 > can ssh to the guest? - "ssh 192.168.122.68" gives "no route to host" - > http://docs.fedoraproject.org/virtualization-guide/f12/en-US/html/ but > the problem does not seem to be covered there. Alexander is correct in saying that bridging would allow you to do that. There are two networking discussed in the guide. The first is a NAT (network address translation), in which the guests are given "private" ip addresses and any outbound traffic appears to be coming from the host machine's IP address. This is the same as the setup on your ADSL router where the internal network machines get addresses of 192.168.x.x but the internet sees your requests as coming from the IP address of your router. There should be lots of documentation in linux firewalling guides under sections on NAT (or possibly called IP Masquerading in some). Have a look at these for information on port forwarding to reveal services inside the virtual (such as ssh). The other option is bridging. This shares the physical network interface of the host with the guest. In this case the VM acts as though it's a machine plugged into the same subnet as the host, its services are accessible like those of the host and it's as vulnerable to attack as the host. Robert

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Dom0 xen support in Fedora 15?
by M A Young 21 Jan '11

21 Jan '11

I am trying to work out whether it is practical to propose Dom0 xen support as a feature for Fedora 15. The kernel situation is that Domain 0 has been accepted upstream for 2.6.37. Assuming a 3 month kernel release cycle, F15 will most likely ship with a 2.6.37.x kernel, with 2.6.38 coming out either after the F15 release or just before but too late to be included. If the plan to get key xen drivers into 2.6.38 succeeds, then F15 may be become usable as a Domain 0 system at some point during its lifetime as the kernel package in a Fedora version typically has one major update. If the kernel team accept backported patches then it might just be possible to ship F15 with usable Domain 0 support but the timescale for that would be very tight. The other thing we would need to consider is what needs to be done to make xen friendly enough to be usable by an ordinary user. The page https://fedoraproject.org/wiki/Features/XenPvopsDom0 contains plans from when dom0 xen support was expected to make a quick return to Fedora, but they are a couple of years old now so probably need updating. I think as a minimum we would need a way to add a dom0 enabled grub entry for a kernel, rather than requiring the user to hand edit the grub file. We should also make sure that xen works with the other Fedora virtualisation tools. What do others think about this? For example is it achievable as a feature, is it too early and better to wait for F16, and what else should we aim to do to make xen usable in Fedora? Michael Young

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Re: [fedora-virt] [Fedora-xen] Benchmarking Xen and KVM
by Digimer 29 Nov '10

29 Nov '10

On 10-11-12 09:57 AM, Todd Deshane wrote: > There is also an ongoing discussion about Xen vs. KVM performance on > the CentOS virt list > > http://lists.centos.org/pipermail/centos-virt/2010-October/002074.html There are some interesting ideas and insightful comments there. I am tempted to abort my own benchmarking, as it seems others are doing the same. I think I will proceed though, until and unless someone there releases numbers first. As I mentioned before, I've hit a snag with my in-progress benchmarks. I've filed a bug but I doubt I will wait for resolution. I'll need a bit more time now to setup a RHEL 6 based platform (host and guests). I'm still hoping to get most done this weekend, but I make no promises. If not, I'll aim for the weekend after to finish. Cheers -- Digimer E-Mail: digimer(a)alteeve.com AN!Whitepapers: http://alteeve.com Node Assassin: http://nodeassassin.org

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spice and ctrl keys to send to guest
by Gianluca Cecchi 29 Nov '10

29 Nov '10

Hello, I'm trying spice with a w2k3 guest. I set up the emulator wrapper to change video adapter when starting the vm. But with w2k3 I get a ctrl+alt+del window at boot... How do I send the key? >From virt-manager screen it doesn' work (I think expected as vnc is not running...) I saw something about a monitor command to add in startup command to be able to send keys via tcp... but if I insert it into my wrapper I get a duplicate error in startup: in startup self._backend.create() File "/usr/lib64/python2.6/site-packages/libvirt.py", line 333, in create if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self) libvirtError: internal error Process exited while reading console log output: qemu-kvm: -monitor telnet:10.4.5.39:4444,server,nowait: Duplicate ID 'monitor' for chardev parse error: telnet:10.4.5.39:4444,server,nowait In fact I see there is already something like this in my command line: -chardev socket,id=monitor,path=/var/lib/libvirt/qemu/w2k3.monitor,server,nowait -mon chardev=monitor,mode=readline Does this mean that the monitor is already enabled? In this case how do I use it? Any docs/hints? Thanks in advance, Gianluca

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question on bridging and vlans
by Gianluca Cecchi 25 Nov '10

25 Nov '10

Hello, I have a test rh el 6 server where I have 6 network adapters, but I think my idea could also cover for example an F13 server with virt-preview repo... eth0 and eth1 are dedicated for bond0 and main ip for kvm host eth4 and eth5 are dedicated as multipath iSCSI initiators for configuring storage pools on disks presented by an iSCSI SAN array I would like to dedicate eth2 and eth3 to network for my guests, but I want to cover multiple vlans. Suppose I want to cover vlanid=1 and vlanid=2 Here is my planned approach 1) configure bond1 with eth1 and eth2 as slaves Something like # cat ifcfg-eth2 DEVICE="eth2" HWADDR="xxxxxxxxxxxxx" NM_CONTROLLED="no" ONBOOT="yes" SLAVE=yes MASTER=bond1 MTU=9000 --> is it ok to put MTU line here or do I have to put it at bond interface definition level? 2) bond1 is without ip/netmask information; something like DEVICE=bond1 BOOTPROTO=none ONBOOT=yes TYPE=Ethernet 3) create bond1.1 script something like this: DEVICE=bond1.1 ONBOOT=yes BOOTPROTO=none VID=1 VLAN=yes IPADDR=myip.1 NETMASK=mynet.1 BROADCAST=mybroadcast.1 BRIDGE=brvlan1 4) create bond1.2 script something like this: DEVICE=bond1.2 ONBOOT=yes BOOTPROTO=none VID=2 VLAN=yes IPADDR=myip.2 NETMASK=mynet.2 BROADCAST=mybroadcast.2 BRIDGE=brvlan2 5) create brvlan1 script DEVICE=brvlan1 TYPE=Bridge BOOTPROTO=dhcp ONBOOT=yes DELAY=0 6) create brvlan2 script DEVICE=brvlan2 TYPE=Bridge BOOTPROTO=dhcp ONBOOT=yes DELAY=0 QUESTION: is it necessary to put BOOTPROTO=dhcp for bridge interfaces? Can I put a static ip or better no ip at all? 7) service network restart with eventually adjustments fro iptables 8) service libvirtd reload If the steps above make sense 9) If I want a guest on vlan1 I have to assign it shared physical device --> brvlan1 QUESTION: in guest do I have to tag the lan or should it be transparent with the guest? Otherwise: waht would be a correct different way of proceeding? If my approach is correct, would it make sense to have similar approache for bond0, so that I can use this bond interface for guests too? Thanks in advance. Gianluca

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virt. machines hang on boot after upgrade to f14
by Michael Kürschner 18 Nov '10

18 Nov '10

Hello, on weekend I upgrade my Fedora from version 13 to 14. Yesterday I try boot my virtuell machines thats I have configured under fedora 13 virt-manager, but no machine boot, for example Fedora, Ubuntu and Windows. If start a virtual machine, I see the BIOS screen and than it switch to a prompt. The cpu graph in virtmanager show a constant line by round 30% but the harddisk io graph show nothing. I try something: reinstall the virt packages, erase the libvirtd configuration and create a new virtual machine, with different hd options, virtio, ide, scsi. I disable selinux and reenable selinux with wrote the selinux flags new on filesystem. If I create a new machine, I see the boot screen from cd-image but if it switch to the normal boot, it shows only the prompt. What can I do to run machines under f14? Or which information can I send to you to locate the problem. I'm desperate and have no idea. My hardware are an AMD Phenom X2 (, with enable virtuallisation option in BIOS) and under f13 the kvm machines run and run ..... Kind regards Micha -- Beat me, whip me, make me use Windows!

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Kerberos and VNC?
by Ken Dreyer 18 Nov '10

18 Nov '10

I am wondering about the status of Kerberos/GSSAPI with VNC in Virtual Machine Manager. http://virt-manager.org/page/RemoteKerberos says that "The VNC protocol does not currently support authentication with Kerberos. This will be added at a later date" but there was a feature wiki page for this for Fedora 11 (http://fedoraproject.org/wiki/Features/VirtVNCAuth) . Did this happen in Fedora 11? - Ken

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[RHEL 6.1] libguestfs test packages available
by Richard W.M. Jones 18 Nov '10

18 Nov '10

libguestfs 1.6 will be the basis for RHEL 6.1. If you are using RHEL 6.0, thanks for supporting Red Hat, and if you want to try out the new version, then I have built some packages here: http://people.redhat.com/~rjones/rhel6.1-libguestfs-preview/ These are built on RHEL 6.0 and should install directly on top of RHEL 6.0. Some highlights: - Based on the upstream stable 1.6 branch. - Much better performance. - Many new features, see: http://libguestfs.org/RELEASE-NOTES.txt - virt-inspector is the RHEL 6.0 virt-inspector (deprecated upstream) - virt-inspector2 is the new upstream virt-inspector They should be completely source and binary compatible with the RHEL 6.0 packages, except for new features. So a program or script that you wrote against libguestfs 1.2.7 in RHEL 6.0 should work unchanged against these new packages. Note these packages are not official or supported by Red Hat. If you have any problems please post about it on the libguestfs mailing list: https://www.redhat.com/mailman/listinfo/libguestfs Rich. PS. The specifics are that we'll move to these versions in RHEL 6.1: - libguestfs 1.6.x, x >= 2, and backports https://bugzilla.redhat.com/show_bug.cgi?id=613593 - hivex 1.2.x, x >= 3 https://bugzilla.redhat.com/show_bug.cgi?id=642631 - febootstrap 2.10 https://bugzilla.redhat.com/show_bug.cgi?id=628849 -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones libguestfs lets you edit virtual machines. Supports shell scripting, bindings from many languages. http://et.redhat.com/~rjones/libguestfs/ See what it can do: http://et.redhat.com/~rjones/libguestfs/recipes.html

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Re: [fedora-virt] [virt-tools-list] spice-xpi in Fedora?
by Cole Robinson 18 Nov '10

18 Nov '10

On 11/17/2010 08:01 PM, Kenneth Armstrong wrote: > I saw this bug update today for the SPICE client: > > https://admin.fedoraproject.org/updates/F14/FEDORA-2010-17338 > > It mentions giving the spicec the ability to work with the spice-xpi > package for RHEV. I did a yum search for spice-xpi which is > apparently available for RHEL, but couldn't find it in Fedora. Is > there a particular repo to use to try this, or is it not in Fedora > yet? > cc-ing fedora-virt

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libvirtd boot start time?
by Tom Horsley 17 Nov '10

17 Nov '10

In my fedora 13 system, watching boot messages go past, I'd see libvirtd start then immediately say [OK] and go to the next service. In fedora 14, I see the starting libvirtd message then it sits for 10 or 20 seconds and finally says [OK]. Has anyone else noticed this? Weirdly, if I say service libvirtd stop after the system is fully up and running followed by service libvirtd start, it starts up near instantaneously the second time. Is there some cache it builds the first time it starts after a boot?

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virt November 2010