[libvirt-users] can I undo the snapshot apply of a qcow2 image
by lyz_pro
Hi all
I have a problem.
Two days ago , I used kvm-img create a snapshot of an qcow2 format image.
And today I apply the snapshot of this image.
The question is can I recovery the image to the last point .
I mean Undo this snapshot apply
--------------
lyz_pro
2014-03-24
10 years, 4 months
[libvirt-users] Issues to manage RAM on openvz guests
by Aurelien Martin
Hi all,
I'm playing with virsh, and I succeed to mange easily some KVM nodes.
But I have issues to size RAM of openvz guests.
virsh set by default the the memory to 256M on each guest instead of that I
specify in the XML
I have to modify by end the variable PHYSPAGES on each
/etc/vz/conf/id_of_my_vz.conf
Please follow the XML dump and the steps that I did.
Cheers,Aurelien
Log
----
1) Define openvz guest domain 103
#virsh -c openvz:///system define vztest.xml
Domain 103 defined from vztest.xml
2) Start the guest
#virsh -c openvz:///system start 103
Domain 103 started
#vzlist
CTID NPROC STATUS IP_ADDR HOSTNAME
103 20 running - -
3) Check memory size vz guest 103
#vzctl enter 103
entered into CT 103
#root@test:/# free -m
total used free shared buffers cached
Mem: 256 27 228 0 0 14
-/+ buffers/cache: 13 242
Swap: 512 0 512
vztest.xml
-----------
<domain type='openvz'>
<name>100</name>
<uuid>86c12009-e591-a159-6e9f-91d18b85ef78</uuid>
<memory unit='GiB'>1</memory>
<currentMemory unit='GiB'>1</currentMemory>
<vcpu placement='static'>1</vcpu>
<os>
<type>exe</type>
<init>/sbin/init</init>
</os>
<devices>
<filesystem type='template' accessmode='passthrough'>
<source name='debian-7.0-x86_64'/>
<target dir='/'/>
</filesystem>
<interface type='bridge'>
<mac address='00:16:3e:1a:66:67'/>
<source bridge='br0'/>
<target dev='veth3'/>
</interface>
</devices>
</domain>
xmldump
--------
<domain type='openvz' id='103'>
<name>103</name>
<uuid>86c52009-e541-a159-6e9f-91d18b85ef79</uuid>
<memory unit='KiB'>0</memory>
<currentMemory unit='KiB'>0</currentMemory>
<vcpu placement='static'>1</vcpu>
<os>
<type>exe</type>
<init>/sbin/init</init>
</os>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>destroy</on_reboot>
<on_crash>destroy</on_crash>
<devices>
<filesystem type='template' accessmode='passthrough'>
<source name='debian-7.0-x86_64'/>
<target dir='/'/>
</filesystem>
<interface type='bridge'>
<mac address='00:16:3e:1a:66:67'/>
<source bridge='br0'/>
<target dev='veth3'/>
</interface>
</devices>
</domain>
10 years, 4 months
[libvirt-users] Live migration process in src/qemu_driver.ca
by Faizul Bari
Hello,
I have been trying to track different phases of a live migration process. I
am using libvirt with qemu-kvm. I am issuing migration commands using
virsh.
Now, I want to measure the time spent in each phase of live migration,
e.g., pre-copy and stop-copy. I stumbled upon the file qemu_driver.c. It
has functions like
qemudDomainMigratePrepare2
qemudDomainMigratePerform
qemudDomainMigrateFinish2
I want to know whether qemudDomainMigratePerform and
qemudDomainMigrateFinish2 directly map to the pre-copy and stop-copy phase?
or the qemudDomainMigratePerform function performs both of them?
Any pointers or suggestions will be greatly appreciated.
Regards
----------------------
Md. Faizul Bari
PhD Student
David R. Cheriton School of Computer Science
University of Waterloo
{http://www.cs.uwaterloo.ca/~mfbari}
[My mind rebels at stagnation! Give me problems! Give me work!]
10 years, 4 months
[libvirt-users] Linux host / Windows guest sharing
by Pal, Laszlo
Hi,
I'm almost give up again because for a day I try to access my windows
kvm guest from FC20 :)
I've tried everything including virtio mapping
mount -t 9p -o trans=virtio,version=9p2000.L hostshare /tmp/hostfiles
where I get the following messages
mount: special device hostshare does not exist
---
---
to be honest clipboard sharing would be enough for me, so I googled
why it is not working and I applied this:
https://mytechdepot.wordpress.com/2013/02/22/enabling-clipboard-copy-past...
yum install spice-vdagent
# chkconfig --add spice-vdagentd
# service spice-vdagentd start
but, the clipboard sharing isn't working....
Do you have any idea to solve any of the issues above?
Thank you
Vlad
10 years, 4 months
[libvirt-users] Adjust disk image migration (NBD)
by Joaquim Barrera
Hi all,
As I am doing some tests with qemu, I realized that the way it does
'migrate -i tcp:DEST:444' is not the same as 'libvirt migrate
--copy-storage-inc'. Basically qemu uses the same stream as RAM
migration and libvirt takes advantage of NBD transfer.
With virsh migrate-setspeed I observed that one can only control the
transfer throughput of RAM, but not disk synchronization. At least this
is what I can see in bmon when doing a migration with incremental copy.
The question is: Am I missing something or it is not implemented?
Thank you guys!
10 years, 4 months
[libvirt-users] KVM networking help needed - Promiscuous network configuration for guest Snort instance
by Philip Wang
Hi,
I am looking for some direction on how to configure KVM networking so that
a promiscuous bridge/host nic/guest nic allows two different network
monitoring packages to sniff the same physical traffic.
The idea is to run a commercial package on the CentOS 6.5 host and Snort,
via Security Onion, on the guest, both being fed by a physical switch SPAN
or physical firewall TAP.
The host has two NICs, one for management and one for sniffing. I am using
libvirt and libvirt-manager to supplement configuration.
I have basic bridge networking configured and connected on the management
NIC, but I can't seem to figure out the missing piece for getting physical
network traffic from the SPAN/TAP port to the Xubuntu guest NIC for
sniffing.
I have seen mention of setting the bridge aging time to 0, but that did not
seem to work and the only place I could find to verify the setting was by
running brctl showmacs <brisge name>. I have also seen posts saying this
was more of a workaround, without discussing an alternate method.
I have tinkered with setting the host nic, bridge, and guest nic to
promiscuous mode, only to see relatively equal traffic climb on the host
nic and bridge, but not the guest nic.
Other searched have turned up discussions about tunctl and its
implementation, so at this point I figured a reality check was in order.
Is this idea feasible? If so, where should I be looking for information on
how to implement it?
Thanks in advance for any pointers.
10 years, 4 months
[libvirt-users] Working Set Size Estimation
by Giampiero De Ciantis
Is there a way through virsh or libvirt to get the working set size for a VM. I am trying to find a metric similar to what VMware calls "Active Memory".
Thanks in advance,
-Gp
10 years, 4 months
[libvirt-users] KVM -snapshot mode
by chris 0
Hi,
I'm just wondering is there any way for me to trigger KVM's
-snapshot parameter from libvirt.
I don't want to clone a disk etc. I just need a way
so that KVM is spawned with a '-snapshot' parameter.
Anyone got any ideas?
Cheers
Chris
10 years, 4 months
[libvirt-users] Undoing domiftune changes
by Brian Rak
If I apply some network limits with domiftune, how do I undo them
(without restarting the VM?)
So let's say I did:
# virsh domiftune SRVID8736 vnet0
inbound.average: 0
inbound.peak : 0
inbound.burst : 0
outbound.average: 0
outbound.peak : 0
outbound.burst : 0
# virsh domiftune SRVID8736 vnet0 --outbound 1000,1000,1000
How I do revert this back to what it was before I set it? If I try
"--outbound 0,0,0" it fails, saying "error: outbound average is mandatory"
10 years, 4 months
