[libvirt-users] Use virtio channel send data to vm fail
by 2020human
1. I created a virtual machine and add channel: <channel type='unix'>
<source mode='bind' path='/var/lib/libvirt/qemu/r-22-VM.agent'/>
<target type='virtio' name='r-22-VM.vport'/>
<address type='virtio-serial' controller='0' bus='0' port='1'/>
</channel>
2. Use scripts,run this scripts is no error output
#!/usr/bin/python
import socket
s=socket.socket(socket.AF_UNIX,socket.SOCK_STREAM)
s.connect("/var/lib/libvirt/qemu/r-22-VM.agent")
s.send("test\n")
s.close
3. But i not read date in vm device /dev/vport0p1 (vm is run)
My version, libvirt: 1.2.13.1 qmeu: 2.3.0 system: centos 6.5
This test in libvirt 1.0.5.7 qemu 1.5.3 is success.
Please help , thanks
9 years, 6 months
[libvirt-users] Libvirt LXC hostname
by Anu Mercian
Hello,
I am trying to bring up an lxc with Centos 6.6 using libvirt command:
"virsh -c lxc:/// create vm.xml"
When I do the above, the new VM created gets the hostname of the host where
libvirt is installed. When I looked up help on the past mail-lists. It
seems like this was a problem back in 2013 and it was mentioned that host
name cannot be provided. I was wondering if this has been resolved and the
host name can be provided in the URI.
Link to the similar issue back in 2013:
https://www.redhat.com/archives/libvirt-users/2013-November/msg00080.html
Any help is much appreciated.
Thank you,
Anu
9 years, 6 months
[libvirt-users] Recommended change for the networking page in wiki
by BJ
Hello all,
I was told on IRC that I should come here to discuss a recommended change
on the networking page in the wiki.
If you take a look at the "Basic Script" shown here:
http://wiki.libvirt.org/page/Networking#Forwarding_Incoming_Connections
It does two things:
1) Create a DNAT rule in the NAT table of IPTABLES
2) Create a FORWARD rule in the FILTER table of IPTABLES
The FORWARD rule is set up as it ought to be, however, the DNAT rule has
some unintended consequences. I set up a DNAT on port 80, and suddenly, I
couldn't access out on port 80 anymore from my guest machine. However, if I
changed the destination address from "anywhere" to the IP of the host
machine, the problem resolved. So I change the script to as follows.
(Changes are highlighted. For some reason the original script didn't work
using /bin/sh, but it did with /bin/bash, so I changed that too).
*#!/bin/bash*
# used some from advanced script to have multiple ports: use an equal
number of guest and host ports
Guest_name=xxxxxxx
Guest_ipaddr=xxx.xxx.xxx.xx
*Host_ipaddr=xxx.xxx.xxx.xx*
Host_port=( '80' '443' )
Guest_port=( '80' '443' )
length=$(( ${#Host_port[@]} - 1 ))
if [ "${1}" = "${Guest_name}" ]; then
if [ "${2}" = "stopped" -o "${2}" = "reconnect" ]; then
for i in `seq 0 $length`; do
iptables -t nat -D PREROUTING *-d ${Host_ipaddr}* -p tcp
--dport ${Host_port[$i]} -j DNAT --to ${Guest_ipaddr}:${Guest_port[$i]}
iptables -D FORWARD -d ${Guest_ipaddr}/32 -p tcp -m state
--state NEW -m tcp --dport ${Guest_port[$i]} -j ACCEPT
done
fi
if [ "${2}" = "start" -o "${2}" = "reconnect" ]; then
for i in `seq 0 $length`; do
iptables -t nat -A PREROUTING *-d ${Host_ipaddr}* -p tcp
--dport ${Host_port[$i]} -j DNAT --to ${Guest_ipaddr}:${Guest_port[$i]}
iptables -I FORWARD 4 -d ${Guest_ipaddr}/32 -p tcp -m state
--state NEW -m tcp --dport ${Guest_port[$i]} -j ACCEPT
done
fi
fi
Lastly, I should note that I am using Ubuntu 14.04, both for the host and
guest.
I'm also curious as to why this is considered a hack method. It states in
the wiki that "This method is a hack", but it doesn't express why. Many VM
Servers have similar features. I know Virtual Box does, I use the same
feature there. It may not be how I would set up a production server, but
doesn't make it a hack.
Thanks,
BJ
9 years, 6 months
[libvirt-users] <vcpu placement='static' current='N'>M</vcpu>
by Thomas Stein
Hello.
I seem to be to stupid to configure vcpu hotplugging on one of my
machines. Whenever i set:
<vcpu placement='static' current='4'>4</vcpu>
and save this setting, this setting is undone by libvirt. It jumps back to:
<vcpu placement='static'>4</vcpu>
I'm confused now. Someone has an idea what's going on here? Any hints
are really appreciated.
cheers
t.
9 years, 6 months
Re: [libvirt-users] <vcpu placement='static' current='N'>M</vcpu>
by Thomas Stein
Am 12.06.15 um 11:43 schrieb Dominique Ramaekers:
> Did you shutdown the guest before making this change?
Yes. I even can't set this setting while the machine is powered off.
Here ist the machines xml.
<domain type='kvm'>
<name>changed</name>
<uuid>c71f66b3-2fd1-42f0-b8be-42999857eb95</uuid>
<memory unit='KiB'>4194304</memory>
<currentMemory unit='KiB'>2097152</currentMemory>
<vcpu placement='static'>4</vcpu>
<resource>
<partition>/machine</partition>
</resource>
<os>
<type arch='x86_64' machine='pc-0.14'>hvm</type>
<boot dev='hd'/>
</os>
<features>
<acpi/>
<apic/>
<pae/>
</features>
<cpu mode='host-model'>
<model fallback='allow'/>
</cpu>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>restart</on_crash>
<devices>
<emulator>/usr/bin/qemu-system-x86_64</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='writeback' io='threads'/>
<source file='/var/lib/libvirt/images/1.qcow2'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05'
function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='writethrough' io='threads'/>
<source file='/var/lib/libvirt/images/nfs.qcow2'/>
<target dev='vdb' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06'
function='0x0'/>
</disk>
<controller type='virtio-serial' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04'
function='0x0'/>
</controller>
<controller type='usb' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01'
function='0x2'/>
</controller>
<controller type='pci' index='0' model='pci-root'/>
<interface type='network'>
<mac address='52:54:00:18:75:ef'/>
<source network='routed'/>
<model type='virtio'/>
<filterref filter='filter-changed'>
<parameter name='IP' value='changed'/>
</filterref>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03'
function='0x0'/>
</interface>
<serial type='pty'>
<target port='0'/>
</serial>
<console type='pty'>
<target type='serial' port='0'/>
</console>
<channel type='unix'>
<source mode='bind' path='/var/lib/libvirt/qemu/f16x86_64.agent'/>
<target type='virtio' name='org.qemu.guest_agent.0'/>
<address type='virtio-serial' controller='0' bus='0' port='1'/>
</channel>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<graphics type='vnc' port='-1' autoport='yes' listen='127.0.0.1'>
<listen type='address' address='127.0.0.1'/>
</graphics>
<video>
<model type='cirrus' vram='16384' heads='1'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02'
function='0x0'/>
</video>
<memballoon model='virtio'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07'
function='0x0'/>
</memballoon>
</devices>
<seclabel type='none' model='none'/>
</domain>
cheers
t.
> -----Oorspronkelijk bericht-----
> Van: Thomas Stein [mailto:himbeere@meine-oma.de]
> Verzonden: vrijdag 12 juni 2015 11:32
> Aan: libvirt-users(a)redhat.com
> Onderwerp: [libvirt-users] <vcpu placement='static' current='N'>M</vcpu>
>
> Hello.
>
> I seem to be to stupid to configure vcpu hotplugging on one of my machines. Whenever i set:
>
> <vcpu placement='static' current='4'>4</vcpu>
>
> and save this setting, this setting is undone by libvirt. It jumps back to:
>
> <vcpu placement='static'>4</vcpu>
>
> I'm confused now. Someone has an idea what's going on here? Any hints are really appreciated.
>
> cheers
> t.
>
> _______________________________________________
> libvirt-users mailing list
> libvirt-users(a)redhat.com
> https://www.redhat.com/mailman/listinfo/libvirt-users
>
9 years, 6 months
Re: [libvirt-users] [ovirt-users] Bug in Snapshot Removing
by Soeren Malchow
Small addition again:
This error shows up in the log while removing snapshots WITHOUT rendering the Vms unresponsive
—
Jun 01 01:33:45 mc-dc3ham-compute-02-live.mc.mcon.net libvirtd[1657]: Timed out during operation: cannot acquire state change lock
Jun 01 01:33:45 mc-dc3ham-compute-02-live.mc.mcon.net vdsm[6839]: vdsm vm.Vm ERROR vmId=`56848f4a-cd73-4eda-bf79-7eb80ae569a9`::Error getting block job info
Traceback (most recent call last):
File "/usr/share/vdsm/virt/vm.py", line 5759, in queryBlockJobs…
—
From: Soeren Malchow <soeren.malchow(a)mcon.net<mailto:soeren.malchow@mcon.net>>
Date: Monday 1 June 2015 00:56
To: "libvirt-users(a)redhat.com<mailto:libvirt-users@redhat.com>" <libvirt-users(a)redhat.com<mailto:libvirt-users@redhat.com>>, users <users(a)ovirt.org<mailto:users@ovirt.org>>
Subject: [ovirt-users] Bug in Snapshot Removing
Dear all
I am not sure if the mail just did not get any attention between all the mails and this time it is also going to the libvirt mailing list.
I am experiencing a problem with VM becoming unresponsive when removing Snapshots (Live Merge) and i think there is a serious problem.
Here are the previous mails,
http://lists.ovirt.org/pipermail/users/2015-May/033083.html
The problem is on a system with everything on the latest version, CentOS 7.1 and ovirt 3.5.2.1 all upgrades applied.
This Problem did NOT exist before upgrading to CentOS 7.1 with an environment running ovirt 3.5.0 and 3.5.1 and Fedora 20 with the libvirt-preview repo activated.
I think this is a bug in libvirt, not ovirt itself, but i am not sure. The actual file throwing the exception is in VDSM (/usr/share/vdsm/virt/vm.py, line 697).
We are very willing to help, test and supply log files in anyway we can.
Regards
Soeren
9 years, 6 months
[libvirt-users] SSH into LXC and install files via JAVA API
by Anu Mercian
Hello everyone,
I am trying to use libvirt's JAVA API to ssh into a domain and install some
files, for example, dhcpd. Using virsh, its pretty straight forward using
the command line:
virsh -c lxc:/// create myguest.xml
virsh -c lxc:/// console myguest
virsh -c lxc:/// lxc-enter-namespace myguest -- sudo yum install dhcpd
But in order to incorporate the above functionality in a JAVA API, I am not
really sure what to do. The following command helps me ssh into a system,
but I am not sure how to send remote commands.
conn = Connect("lxc+ssh:///")
Please can someone help me out with this?
Thank you,
Anu
9 years, 6 months
[libvirt-users] how do I use the same secret with the same ID on all libvrit/qemu/kvm hosts?
by Jelle de Jong
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Hash: SHA1
Hello everybody,
Every time I use [virsh secret-define --file secret.xml] I get an
unique id back and I use this id in my vm guests xml configs, but this
is preventing me from live migrating between kvm host.
Maybe im using the wrong methods, but i normaly dumpxml the config and
define it in the other kvm hosts (scripted) but now this other host
has an other unique id and the kvm guests fails so I'm guessing I need
to use the same secret id betwen all my kvm hosts but how do i do this?
Kind regards,
Jelle de Jong
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9 years, 6 months
[libvirt-users] LXCs using Libvirt
by Anu Mercian
Hi all,
I am trying to bring up lxc's using Libvirt JAVA API. I do the following:
conn = Connect("lxc:\\\")
xml_config = "<domain> .... <\domain>"
dom = conn.domainCreateXML(xml_config, 0)
dom.create()
Using the above code, I am able to start a domain but the domain is not
visible within the "lxc" list, i.e
when I use the command "lxc-ls --fancy", the domain that was created cannot
be viewed, although, when I use the function conn.listDomains(), I can view
the domain.
As a work-around if I use the "lxc-create -t <OS> -n <name>" command
followed by "conn.domainDefineXML(xml_config)", I can view the domain
within "lxc-ls --fancy"
Any one has observed this problem earlier and is there a way I can create
the domain without using "lxc-create ..." command and still list the domain
on the "lxc-ls --fancy" list?
Thank you,
Anu
9 years, 6 months
[libvirt-users] Freeze Windows Guests For Consistent Storage Snapshots
by Payes Anand
Hi,
Is it possible to freeze windows guests for a consistent storage level
snapshot.
I am using openstack icehouse on centos 6.6
Hypervisor: KVM
Libvirt: 0.10.2
Qemu: 0.10.2
Guest OS: Windows 7 and Windows Server 2008
I was able to freeze Centos guests by issuing the command:
virsh qemu-agent-command <guest_ID> '{"execute":"guest-fsfreeze-freeze"}'
For CentOS guests, I enabled access between compute nodes and guests
through a socket by setting metadata parameter, hw_qemu_guest_agent=yes for
the guest image.
And then installing qemu-guest-agent inside the guest.
What steps do i have to follow for windows ?
Regars,
Payes
9 years, 6 months
