[libvirt-users] virsh list not working with xen 4
by Rogério Vinhal Nunes
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
12 years, 3 months
[libvirt-users] converting save/dump output into physical memory image
by Andrew Tappert
A lot of people in the security community, myself included, are
interested in memory forensics these days. Virtualization is a natural
fit with memory forensics because it allows one to get access to a
guest's memory without having to introduce any extra software into the
guest or otherwise interfere with it. Incident responders are
particularly interested in getting memory dumps from systems they're
investigating.
Virsh has "save" and "dump" commands for storing the state of a guest to
a file on disk, but memory of KVM guests doesn't get saved in the
"standard" input format for memory forensics tools, which is a raw
physical memory image. (This is what you'd get via the classical "dd
/dev/mem" approach or the contemporary equivalent using the crash
driver; and VMware Server and Workstation produce .vmem files, which are
such raw physical memory images, when a guest is paused or snapshotted.)
In order to analyze the memory of Libvirt/KVM guests with my Linux
memory forensics software, Second Look, I've created a tool for
converting Libvirt-QEMU-save files (output of virsh save command) or
QEMU-savevm files (output of virsh dump command) to raw physical memory
images.
I've got a basic working capability, though I'm still tracking down some
problems with a guest allocated 8GB RAM--not all the memory seems to be
present in the save or dump file. And I haven't tested very extensively
yet, version support is limited to what I myself am currently running, etc.
I'd like to know if this is a capability that others are interested in.
Is this something that would be of interest to the Libvirt project if I
were to contribute the code, or to the KVM project, or do you think it
best exists as a separate project?
I've also got a proof-of-concept tool for converting hibernate images to
raw physical memory images. Perhaps a collection of tools for
converting various memory dump formats would be a good project. Anyone
else interested in this kind of stuff? As an author of commercial
memory forensics software I've got a vested interest in availability of
good memory acquisition capabilities. But there are a number of people
working on FOSS Linux memory analysis tools, too...
Andrew
12 years, 6 months
[libvirt-users] Thread-safety issues with vbox driver ?
by Jean-Baptiste Rouault
Hi,
I'm experiencing weird things with the vbox driver when using multiple threads.
Following is the snippet of code I experience problems with
/*****************************************************/
#include <stdlib.h>
#include <stdio.h>
#include <pthread.h>
#include <libvirt/libvirt.h>
void *create_and_destroy(void *arg)
{
virDomainPtr dom = (virDomainPtr)arg;
char buf[VIR_UUID_STRING_BUFLEN];
virDomainGetUUIDString(dom, buf);
if (virDomainCreate(dom) != 0) {
printf("failed to start %s\n", buf);
goto end;
}
printf("%s started\n", buf);
if (virDomainDestroy(dom) != 0) {
printf("failed to destroy %s\n", buf);
}
printf("%s destroyed\n", buf);
end:
virDomainFree(dom);
pthread_exit(NULL);
}
int main(int argc, char **argv)
{
virConnectPtr conn = virConnectOpen("vbox:///session");
int i;
int count = virConnectNumOfDefinedDomains(conn);
char **names = malloc(count * sizeof(char *));
virConnectListDefinedDomains(conn, names, count);
virDomainPtr *doms = malloc(count * sizeof(virDomainPtr));
for (i = 0 ; i < count ; ++i) {
doms[i] = virDomainLookupByName(conn, names[i]);
}
pthread_t *threads = malloc(count * sizeof(pthread_t));
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
for (i = 0 ; i < count ; ++i) {
pthread_create(&threads[i], &attr, create_and_destroy, (void *)doms[i]);
}
pthread_attr_destroy(&attr);
for (i = 0 ; i < count ; ++i) {
pthread_join(threads[i], NULL);
}
virConnectClose(conn);
pthread_exit(NULL);
}
/************************************************/
Here is the output of the program with 2 defined domains:
> libvir: VBOX error : operation failed: OpenRemoteSession/LaunchVMProcess failed, domain can't be started
> failed to start c538c89a-70da-42ab-a88a-5aeb15698c12
> 034cf837-abe7-4c48-8373-0ddcf480d416 started
> 034cf837-abe7-4c48-8373-0ddcf480d416 destroyed
Sometimes the first domain really fails to start, but sometimes it starts correctly but libvirt reports
an error. Sometimes domains aren't destroyed but libvirt reports no error at all.
If there is only one domain, no problem occurs at all. I also tried the same code (ie with multiple domains)
but with only one thread and it works well.
I managed to reproduce these issues with libvirt 0.9.4, 0.9.7, using VirtualBox 4.0 and 4.1.
--
Jean-Baptiste ROUAULT
Ingénieur R&D - diateam : Architectes de l'information
Phone : +33 (0)9 53 16 02 70 Fax : +33 (0)2 98 050 051
12 years, 8 months
[libvirt-users] Network questions
by paul.worner＠thomsonreuters.com
Hi all,
When creating a new network:
1) Is there a way to disable automatic spawning of dnsmasq on network creation? I read that leaving out the <DHCP> section should accomplish this, but that is not what I am seeing.
2) Is there a way to disable automatic installation of iptables rules?
3) For that matter, what is the purpose of the default iptables rule set? Doesn't line 3 let all traffic pass anyway?
Thanks,
Paul
Running libvirt 0.9.2 on Ubuntu 11.10 server.
Here's the libvirt network config:
RAW CONFIG
<network>
<name>test</name>
<bridge name="virbr%d" stp="off" delay="0"/>
<forward mode="route"/>
<ip address="192.168.0.1" netmask="255.255.255.0">
</ip>
</network>
COMMAND
virsh net-create test.xml
RESULTS
virsh net-dumpxml test
<network>
<name>test</name>
<uuid>2eff5e7f-847a-1fbf-ec82-01a46ef0f6c2</uuid>
<forward mode='route'/>
<bridge name='virbr3' stp='off' delay='0' />
<mac address='52:54:00:47:E6:15'/>
<ip address='192.168.0.1' netmask='255.255.255.0'>
</ip>
</network
ps aux | grep dns
nobody 4391 0.0 0.0 21616 916 ? S 09:45 0:00 dnsmasq --strict-order --bind-interfaces --pid-file=/var/run/libvirt/network/test.pid --conf-file= --except-interface lo --listen-address 192.168.0.1
iptables -L --line-numbers
Chain FORWARD (policy ACCEPT)
num target prot opt source destination
1 ACCEPT all -- anywhere 192.168.0.0/24
2 ACCEPT all -- 192.168.0.0/24 anywhere
3 ACCEPT all -- anywhere anywhere
4 REJECT all -- anywhere anywhere reject-with icmp-port-unreachable
5 REJECT all -- anywhere anywhere reject-with icmp-port-unreachable
12 years, 10 months
[libvirt-users] Libvirt migration issues (0.9.4 and 0.9.9)
by Daniel Espling
Dear all,
we're having two different problems with migrations in libvirt, running as root user on host machines with CentOS release 5.5 (Final), kernel: Linux 2.6.32.24 #3 SMP Fri Oct 29 16:22:02 BST 2010 x86_64 x86_64 x86_64 GNU/Linux
First case:
virsh version
Compiled against library: libvir 0.9.4
Using library: libvir 0.9.4
Using API: QEMU 0.9.4
Running hypervisor: QEMU 1.0.50
Migrations work well for a basic VM, but if we attach a disk to the usb bus migration is no longer possible and fails with the error message: "error: operation failed: migration job: is not active". This is regardless of if the device is mounted inside the VM or not (debian). Please find more information attached.
If we attach the same (.iso based) disk to the scsi bus instead, migrations work as normal.
----
To mitigate this problem, we tried upgrading to a more recent libvirt version:
Compiled against library: libvir 0.9.9
Using library: libvir 0.9.9
Using API: QEMU 0.9.9
Running hypervisor: QEMU 1.0.50
When trying to migrate a normal (debian) instance from one host to another using the same domain as in the previous successful case without any devices attached, migration fails with the error message "error: Unable to copy socket file handle: Invalid argument". The libvirt.log only has a similar single-line of information: 2012-01-30 15:44:46.772+0000: 7546: error : virNetSocketDupFD:787 : Unable to copy socket file handle: Invalid argument.
The network configuration used here is the same as we successfully used in the 0.9.4 test case, using static ip's.
Thankful for assistance, not really sure what to try next. :)
Regards,
Daniel Espling
12 years, 10 months
[libvirt-users] libvir: error : cannot getpwuid_r(107): Success
by vipul borikar
I am on RHEL 6.1 running KVM. I am getting following error when i start a
Ubuntu 11.10 Guest
I am attaching my xml file .
# virsh -c qemu:///system create Ubuntu-110.10.xml
error: Failed to create domain from Ubuntu-110.10.xml
error: internal error Process exited while reading console log output:
16:19:53.991: 2418: info : libvirt version: 0.8.7, package: 18.el6 (Red
Hat, Inc. <http://bugzilla.redhat.com/bugzilla>, 2011-04-18-10:28:30,
x86-008.build.bos.redhat.com)
16:19:53.991: 2418: error : virSetUIDGID:2905 : cannot getpwuid_r(107):
Success
libvir: error : cannot getpwuid_r(107): Success
Where should i looks for more info???
--
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."
12 years, 10 months
[libvirt-users] How to change libvirt / cgroup interaction?
by Samuel Hassine
Hi there,
Do you know if there is a way to modify how libvirt interacts with the
cgroup?
Because, I successfully add the /dev/net/tun support in my LXC container
by doing:
echo c 10:200 rwm >> /cgroup/libvirt/lxc/instance-00000005/devices.allow
But when I restart the instance/LXC container, this option has gone.
How can I make this persistant? Is there a configuration file?
Thanks for your answers.
Best regards.
Sam
12 years, 11 months
[libvirt-users] Preventing 'virsh start' while doing backup?
by Ken Coar
Is there any way to interface with virsh to keep it from executing a
startup operation? Sort of like the /etc/nologin (man page nologin(5))
mechanism?
Basically, I want to be able to shut down a VM in order to copy its
disk images, and be reasonably assured that it won't be started
before I'm finished.
Is there any sort of hook or interlock file or other mechanism to
accomplish this?
Thanks!
--
#ken B-)}
Ken Coar, Sanagendamgagwedweinini
IT Engineering Tower, Red Hat/RDU
"Millennium hand and shrimp!"
12 years, 11 months
[libvirt-users] how to change existing domain xml?
by p-man314＠mail.ru
Hi.
I'm trying to change network settings for a domain via libvirt (the driver is
xenapi) with no success.
According to its sources, 'virsh edit' uses virDomainGetXMLDesc(), allows to
edit the received xml and then use virDomainDefineXML(). In case of xenapi
driver it leads to a new vm creation (with the same name and edited settings).
Looking through the list of API functions I failed to find a function like
virDomainUpdateXML() that would change configuration of existing domain.
Could you please suggest a way to do it?
Thanks in advance.
12 years, 11 months
[libvirt-users] ANNOUNCE: oz 0.8.0 release
by Chris Lalancette
All,
I'm pleased to announce release 0.8.0 of Oz. Oz is a program for
doing automated installation of guest operating systems with limited
input from the user.
Release 0.8.0 is a (long overdue) bugfix and feature release for
Oz. Some of the highlights between Oz 0.7.0 and 0.8.0 are:
- Optional virtualenv make target
- Conversion of unittests to py.test
- Replace mkisofs with genisoimage
- Debian package
- Ability to change the root password for Debian installs
- Add unittests for ozutil
- Add some unittests for the Guest object
- SSH tunnel (with SSL vhost) support for local repositories
(mostly useful for imagefactory)
- Add a new manpage for oz-examples
- Make the output filename configurable with a command-line
option to oz-install
- Monitor both network and disk activity when looking for guest activity
- Support for installing Ubuntu 11.10
- Support for SSL certificates for repositories
- Support for an optional version in the TDL
- Support for installling Mandrake 9.1, 9.2, 10.0, 10.1, 10.2
- Support for installing Mandriva 2006.0, 2007.0, 2008.0
- Support for Ubuntu customization
- Support for installing RHEL 6.2
A tarball of this release is available, as well as packages for
Fedora-16. Instructions on how to get and use Oz are available at
http://aeolusproject.org/oz.html
If you have any questions or comments about Oz, please feel free
to contact aeolus-devel(a)lists.fedorahosted.org or me
(clalancette(a)gmail.com) directly.
Thanks to everyone who contributed to this release through bug
reports, patches, and suggestions for improvement.
--
Chris Lalancette
12 years, 11 months
