February 2009 - Devel - libvirt List Archives

[libvirt] [PATCH]: Fix non-live migration failure
by Chris Lalancette 27 Feb '09

27 Feb '09

There is a logic error in the Qemu driver when doing a non-live migrate. During a non-live migrate, on the source host during the Perform step, we pause the domain; however, if there was ever a failure, we were forgetting to unpause the domain, meaning that the domain was paused forever. Add a flag to tell us when we should unpause the domain after a failure. Also, as pointed out by DV, we were unnecessarily using a snprintf to a buffer to execute qemu monitor commands, when we could get away with just sending a static string. Fix that as well. Signed-off-by: Chris Lalancette <clalance(a)redhat.com>

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[libvirt] libvirt tls vnc
by Michael Kress 27 Feb '09

27 Feb '09

Hi, is there a comprehensive howto/tutorial you can recommend me on how to set up libvirt with vnc over tls properly? What I'm trying to do is to use vnc for production use outside my local network and therefore I'd like to secure the vnc sessions. I already made some attempts with ssvnc and Ultr@VNC (both windows clients) but these attemps all failed. I can't get the vnc server (launched by virt-install / kvm) to be displayed via tls. It all runs perfectly without tls. Thanx for any hints! Michael

4 16

[libvirt] using virsh remotely
by Andreas Rittershofer 27 Feb '09

27 Feb '09

I can use virsh as a command line tool, for exampe virsh list gives me the list of the running machines and I am back to the prompt. When I make virsh -c qemu+ssh://maschine-2/system list I get the list of the running machine on the remote machine-2 - but that's it, I am not back to the prompt automatically. I want virsh to behave used remotely as used locally - execute the command and go back to the prompt. How this can be done? mfg ar -- Hier könnte keine Signatur stehen.

2 2

[libvirt] adding bandwidth control support
by Max Zhen 26 Feb '09

26 Feb '09

My last post failed, resend... Max Zhen at 2008-12-24 18:39 wrote: > Hi, > > I'm working on adding bandwidth control support in > virt-install/virsh/libvirt on Xen. > This support can allow setting bandwidth control in dom0 (I'm working on > Solaris dom0 now) for virtual nic devices used in a domU. > I've attached my design in this email. > Basically, this design is about how to represent bandwidth limit > information in command line for virsh/virt-install and how to represent > it in current XML configuration file for a domU. > > Your comments will be highly appreciated :). > > Thanks, > Max > > There are a few things to do to achieve this goal: 1. extend current command line syntax of 'virsh attach-interface' 2. extend current command line syntax of 'virt-install' 3. define bandwidth representation in XML format For 1. I will change the current command line syntax to: virsh attach-interface <domain> <type> <source> [--target <target>] [--mac <mac>] [--script <script>] [--rate <rate-string>] So that we are able to specify bandwidth as "--rate 100M" in command line, like: #virsh attach-interface domu bridge bge0 --rate 100M In this case, bandwidth is specified as an integer with one of the scale suffixes K, M, or G for Kbps, Mbps, or Gbps. For 2. I will add one more option "--rate=rate-string" to current option set of virt-install command. Users can repeatedly add more than one 'rate' options to set bandwidth for multiple nic devices respectively, if needed. For example, with below command line, we start installing a domain with two nic devices whose bandwidth are set to 100Mb/s and 200Mb/s respectively: #virt-install -n snv105 -r 2048 -p --file=/root/snv105 --location=/solarisdvd.iso -b bge0 --rate=100M -b bge1 --rate=200M In this case, bandwidth is specified as an integer with one of the scale suffixes K, M, or G for Kbps, Mbps, or Gbps. For 3. All user specified bandwidth will be represented as part of interface element currently defined in XML configuration file. The new format looks like: <interface type='bridge'> <source bridge='e1000g1'/> <flowcontrol> <rate unit='megabit' period='second' value='100'/> </flowcontrol> </interface> So, I create a new element, "flowcontrol", inside "interface" element. Inside "flowcontrol", I provide bandwidth by setting "rate" element with three attributes, "unit", "period" and "value" to express the bandwidth limit. The supported unit can be 'gigabit', 'megabit' and 'kilobit'. The supported period can be 'second', 'millisecond' and 'microsecond'. And value is an integer to express the amount of data in unit allowed to be transfered in period of time. More elements can be added inside "flowcontrol" element, if we want to add more flow control policies in the future.

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[libvirt] Help with bridged networking
by watcher lines 26 Feb '09

26 Feb '09

Hi, I have setup my virtual networks with initscripts like in this link: http://wiki.libvirt.org/page/Networking#Bridged_networking_.28aka_.22shared…, but there is no networking whitin any system either between vms or with the host and the vms. This setup is for kvm, but with Xen in Fedora 8 it works perfect, but xen is now deprecated in Fedora. This is my setup: /etc/sysconfig/network-scripts/ifcfg-worknet: # worknet bridge DEVICE=worknet BOOTPROTO=none BROADCAST=172.16.1.255 #HWADDR=00:50:56:C0:00:01 IPADDR=172.16.1.1 NETMASK=255.255.255.0 NETWORK=172.16.1.0 ONBOOT=yes TYPE=Bridge STP=off DELAY=0 With Xen this alone lets ip traffic pass between host and to allow dhcp and other protocols i have this line in my iptables: -A FORWARD -i worknet -j ACCEPT This is the software I'm using: libvirt-0.4.4-2.fc8 kvm-60-7.fc8 Thanks for your attention. _________________________________________________________________ Consigue gratis el nuevo Messenger. ¡Descárgatelo! http://download.live.com/

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[libvirt] networking with two hosts
by Andreas Rittershofer 26 Feb '09

26 Feb '09

The following situation is given: Host A with VM1 and VM2 running. Host B with VM3 und VM4 running. Task 1.) Each VM must have network access to each other VM and to the outside. Task 2.) When one host fails, all VMs are running on the remainig host and 1.) must still be fulfilled. Does somebody has any hints about realising this scenario with libvirt and KVM? mfg ar -- Hier könnte keine Signatur stehen.

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[libvirt] Adding VirtualBox support to libvirt
by Pritesh Kothari 26 Feb '09

26 Feb '09

Hi, I am in the process of adding support for virtualbox in libvirt. Basically Virtualbox exports its API through XPCOM. Now to simplify things I was thinking of using C++ and already existing xpcom component in virtualbox but since libvirt exports C API i am not sure if i should use C++ or stick to plain C. I would like to request the libvirt community for its comment on this. Regards, Pritesh

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[libvirt] PATCH: Support memory balloon device in QEMU (incomplete)
by Daniel P. Berrange 26 Feb '09

26 Feb '09

This is an incomplete patch starting to support the memory balloon device in QEMU guests. This requires the VirtIO Balloon driver be present in the guest. In much the same way as with Xen guests, this lets you adjust the memory allocation of the guest on the fly, ceiling limited by the initial memory allocation when booted. The missing bit is to use 'info balloon' to fetch the current allocation for the virDomainGetInfo() API call. Regards, Daniel diff -r 2662c220efc8 src/qemu_driver.c --- a/src/qemu_driver.c Thu Feb 26 15:31:11 2009 +0000 +++ b/src/qemu_driver.c Thu Feb 26 15:31:23 2009 +0000 @@ -2223,6 +2223,46 @@ cleanup: return ret; } + +static int qemudDomainSetMemoryBalloon(virConnectPtr conn, + virDomainObjPtr vm, + unsigned long newmem) { + char *cmd; + char *reply; + + /* + * 'newmem' is in KB, QEMU monitor works in MB, and we all wish + * we just worked in bytes with unsigned long long everywhere. + */ + if (virAsprintf(&cmd, "balloon %lu", (newmem / 1024)) < 0) { + virReportOOMError(conn); + return -1; + } + + if (qemudMonitorCommand(vm, cmd, &reply) < 0) { + qemudReportError(conn, dom, NULL, VIR_ERR_OPERATION_FAILED, + "%s", _("could not balloon memory allocation")); + VIR_FREE(cmd); + return -1; + } + VIR_FREE(cmd); + + /* If the command failed qemu prints: + * device not found, device is locked ... + * No message is printed on success it seems */ + DEBUG ("balloon reply: %s", reply); + if (strstr(reply, "\nunknown command:")) { + qemudReportError (conn, dom, NULL, VIR_ERR_OPERATION_FAILED, + _("memory ballooning is not supported %s"), reply); + VIR_FREE(reply); + return -1; + } + VIR_FREE(reply); + + return 0; +} + + static int qemudDomainSetMemory(virDomainPtr dom, unsigned long newmem) { struct qemud_driver *driver = dom->conn->privateData; virDomainObjPtr vm; @@ -2240,20 +2280,18 @@ static int qemudDomainSetMemory(virDomai goto cleanup; } + if (newmem > vm->def->maxmem) { + qemudReportError(dom->conn, dom, NULL, VIR_ERR_INVALID_ARG, + "%s", _("cannot set memory higher than max memory")); + goto cleanup; + } + if (virDomainIsActive(vm)) { - qemudReportError(dom->conn, dom, NULL, VIR_ERR_NO_SUPPORT, - "%s", _("cannot set memory of an active domain")); - goto cleanup; - } - - if (newmem > vm->def->maxmem) { - qemudReportError(dom->conn, dom, NULL, VIR_ERR_INVALID_ARG, - "%s", _("cannot set memory higher than max memory")); - goto cleanup; - } - - vm->def->memory = newmem; - ret = 0; + ret = qemudDomainSetMemoryBalloon(dom->conn, vm, newmem); + } else { + vm->def->memory = newmem; + ret = 0; + } cleanup: if (vm) -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://ovirt.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|

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[libvirt] [PATCH]: Fix non-live migration failure case
by Chris Lalancette 26 Feb '09

26 Feb '09

All, There was a logic error in the Qemu driver when doing a non-live migrate. During a non-live migrate, on the source host during the Perform step, we pause the domain; however, if there was ever a failure, we were forgetting to unpause the domain, meaning that the domain was paused forever. Add a flag to tell us when we should unpause the domain after a failure. Signed-off-by: Chris Lalancette <clalance(a)redhat.com>

2 2

[libvirt] [PATCH 0/1] Resend of example program
by David Allan 26 Feb '09

26 Feb '09

I'm just resending this patch, as nobody objected to it after I incorporated the feedback I got, but it never got applied, either. Dave

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