[libvirt-users] [virtual interface] detach interface during boot succeed with no changes
by Yalan Zhang
Hi guys,
when I detach an interface from vm during boot (vm boot not finished), it
always fail. I'm not sure if there is an existing bug. I have
confirmed with someone that for disk, there is similar behavior, if
this is also acceptable?
# virsh destroy rhel7.2; virsh start rhel7.2 ;sleep 2; virsh
detach-interface rhel7.2 network 52:54:00:98:c4:a0; sleep 2; virsh
dumpxml rhel7.2 |grep /interface -B9
Domain rhel7.2 destroyed
Domain rhel7.2 started
Interface detached successfully
<address type='pci' domain='0x0000' bus='0x00' slot='0x06'
function='0x0'/>
</controller>
<interface type='network'>
<mac address='52:54:00:98:c4:a0'/>
<source network='default' bridge='virbr0'/>
<target dev='vnet0'/>
<model type='rtl8139'/>
<alias name='net0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03'
function='0x0'/>
</interface>
When I detach after the vm boot, expand the sleep time to 10, it will succeed.
# virsh destroy rhel7.2; virsh start rhel7.2 ;sleep 10; virsh
detach-interface rhel7.2 network 52:54:00:98:c4:a0; sleep 2; virsh
dumpxml rhel7.2 |grep /interface -B9
Domain rhel7.2 destroyed
Domain rhel7.2 started
Interface detached successfully
-------
Best Regards,
Yalan Zhang
IRC: yalzhang
Internal phone: 8389413
1 year, 8 months
[libvirt-users] Question about disabling UFO on guest
by Bao Nguyen
Hello everyone,
I would like to ask a question regarding to disable UFO of virtio vNIC in
my guest. I have read the document at https://libvirt.org/formatdomain.html
*host*
The csum, gso, tso4, tso6, ecn and ufo attributes with possible
values on and off can be used to turn off host offloading options. By
default, the supported offloads are enabled by QEMU. *Since 1.2.9 (QEMU
only)* The mrg_rxbuf attribute can be used to control mergeable rx buffers
on the host side. Possible values are on (default) and off. *Since 1.2.13
(QEMU only)*
*guest*
The csum, tso4, tso6, ecn and ufo attributes with possible
values on and off can be used to turn off guest offloading options. By
default, the supported offloads are enabl
ed by QEMU.
*Since 1.2.9 (QEMU only)*
Then I disabled UFO on my vNIC on guest as the following configuration
<devices>
<interface type='network'>
<source network='default'/>
<target dev='vnet1'/>
<model type='virtio'/>
<driver name='vhost' txmode='iothread' ioeventfd='on' event_idx='off'
queues='5' rx_queue_size='256' tx_queue_size='256'>
*<host gso='off' ufo='off' />*
*<guest ufo='off'/>*
</driver>
</interface>
</devices>
Then I reboot my node to get the change effect and it works. However, can I
disable the UFO without touching the host OS? or it always has to disable
on both host and guest like that?
Thanks,
Brs,
Natsu
3 years, 9 months
[libvirt-users] ceph rbd pool and libvirt manageability (virt-install)
by Jelle de Jong
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Hello everybody,
I created a rbd pool and activated it, but I can't seem to create
volumes in it with virsh or virt-install?
# virsh pool-dumpxml myrbdpool
<pool type='rbd'>
<name>myrbdpool</name>
<uuid>2d786f7a-2df3-4d79-ae60-1535bcf1c6b5</uuid>
<capacity unit='bytes'>6997998301184</capacity>
<allocation unit='bytes'>10309227031</allocation>
<available unit='bytes'>6977204658176</available>
<source>
<host name='ceph01.powercraft.nl' port='6789'/>
<host name='ceph02.powercraft.nl' port='6789'/>
<host name='ceph03.powercraft.nl' port='6789'/>
<name>libvirt-pool</name>
<auth type='ceph' username='libvirt'>
<secret uuid='029a334e-ed57-4293-bb99-ffafa8867122'/>
</auth>
</source>
</pool>
# virt-install --version
1.0.1
# virsh --version
1.2.9
I ended using virsh edit ceph-test.powercraft.nl and making creating
the disk manually.
<disk type='network' device='disk'>
<auth username='libvirt'>
<secret type='ceph' uuid='029a334e-ed57-4293-bb99-ffafa8867122'/>
</auth>
<source protocol='rbd' name='libvirt-pool/kvm01-storage'>
<host name='ceph01.powercraft.nl' port='6789'/>
<host name='ceph02.powercraft.nl' port='6789'/>
<host name='ceph03.powercraft.nl' port='6789'/>
</source>
<target dev='vdc' bus='virtio'/>
</disk>
I use virt-install a lot to define, import and undefine domains, how
can I use virt-install to manage my rdb disks?
Kind regards,
Jelle de Jong
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5 years, 8 months
[libvirt-users] virRandomBits - not very random
by Brian Rak
I just ran into an issue where I had about 30 guests get duplicate mac
addresses assigned. These were scattered across 30 different machines.
Some debugging revealed that:
1) All the host machines were restarted within a couple seconds of each
other
2) All the host machines had fairly similar libvirtd pids (within ~100
PIDs of each other)
3) Libvirt seeds the RNG using 'time(NULL) ^ getpid()'
This perfectly explains why I saw so many duplicate mac addresses.
Why is the RNG seed such a predictable value? Surely there has to be a
better source of a random seed then the timestamp and the pid?
The PID seems to me to be a very bad source of any randomness. I just
ran a test across 60 of our hosts. 43 of them shared their PID with at
least one other machine.
5 years, 11 months
[libvirt-users] Create qcow2 v3 volumes via libvirt
by Gionatan Danti
Hi all,
on a fully patched CentOS 7.4 x86-64, I see the following behavior:
- when creating a new volumes using vol-create-as, the resulting file is
a qcow2 version 2 (compat=0.10) file. Example:
[root@gdanti-lenovo vmimages]# virsh vol-create-as default zzz.qcow2
8589934592 --format=qcow2 --backing-vol /mnt/vmimages/centos6.img
Vol zzz.qcow2 created
[root@gdanti-lenovo vmimages]# file zzz.qcow2
zzz.qcow2: QEMU QCOW Image (v2), has backing file (path
/mnt/vmimages/centos6.img), 8589934592 bytes
[root@gdanti-lenovo vmimages]# qemu-img info zzz.qcow2
image: zzz.qcow2
file format: qcow2
virtual size: 8.0G (8589934592 bytes)
disk size: 196K
cluster_size: 65536
backing file: /mnt/vmimages/centos6.img
backing file format: raw
Format specific information:
compat: 0.10
refcount bits: 16
- when creating a snapshot, the resulting file is a qcow2 version 3
(comapt=1.1) file. Example:
[root@gdanti-lenovo vmimages]# virsh snapshot-create-as centos6left
--disk-only --no-metadata snap.qcow2
Domain snapshot snap.qcow2 created
[root@gdanti-lenovo vmimages]# file centos6left.snap.qcow2
centos6left.snap.qcow2: QEMU QCOW Image (v3), has backing file (path
/mnt/vmimages/centos6left.qcow2), 8589934592 bytes
[root@gdanti-lenovo vmimages]# qemu-img info centos6left.snap.qcow2
image: centos6left.snap.qcow2
file format: qcow2
virtual size: 8.0G (8589934592 bytes)
disk size: 196K
cluster_size: 65536
backing file: /mnt/vmimages/centos6left.qcow2
backing file format: qcow2
Format specific information:
compat: 1.1
lazy refcounts: false
refcount bits: 16
corrupt: false
From what I know, this is a deliberate decision: compat=1.1 requires
relatively recent qemu version, and creating a new volume play on the
"safe side" of compatibility.
It is possible to create a new volume using qcow2 version 3 (compat=1.1)
format *using libvirt/virsh* (I know I can do that via qemu-img)? Any
drawback on using version 3 format?
Thanks.
--
Danti Gionatan
Supporto Tecnico
Assyoma S.r.l. - www.assyoma.it
email: g.danti(a)assyoma.it - info(a)assyoma.it
GPG public key ID: FF5F32A8
5 years, 12 months
[libvirt-users] User name / session idin logs
by Anastasiya Ruzhanskaya
Hello everyone,
I have a question about logging. I need to find out whether it is possible
to see user id/session id inside logs or somewhere else. It is not passed
in structured across the network, so where should I look to find out, which
user (which session) is currently performing the actions?
6 years
[libvirt-users] Using alias under disk in XML
by Andre Goree
I've been trying to follow the information found here [1] in order to
provide an alias for RBD disks I'm defining, however it does not appear
to be working and I wanted to see if I was doing something wrong.
I define the alias like so (using 'virsh edit'):
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='writeback'
error_policy='stop' discard='unmap'/>
...truncated...
<alias name='ua-test'/>
</disk>
However, when I then 'virsh dumpxml {guest}', the alias is not there.
There is no error given after my edits are made and saved. It just
seems that libvirt is completely ignoring or removing my changes,
without reason.
Can anyone give any insight on why this might be happening, and/or help
me with the proper way of defining the alias?
1 - https://libvirt.org/formatdomain.html
--
Andre Goree
-=-=-=-=-=-
Email - andre at drenet.net
Website - http://blog.drenet.net
PGP key - http://www.drenet.net/pubkey.html
-=-=-=-=-=-
6 years, 1 month
[libvirt-users] Unable to libvirt wireshark dissector
by Han Han
Hi guys,
I am trying to analyze libvirt rpc protocol by wireshark. But I found
wireshark doesn't dissect libvirt packets. Here are my environments
operations:
1. Environments:
My system: Debian GNU/Linux buster/sid with *kernel-4.15.0-1-amd64*
Packages installed:
*libvirt0-4.1.0-2-amd64 libvirt-wireshark-4.1.0-2-amd64
wireshark-2.4.5-1-amd64*
2. Libvirt configurations
*/etc/libvirt/libvirtd.conf*:
*listen_tls = 0listen_tcp = 1tcp_port = "16509"auth_tcp = "none"*
Libvirtd started with options
*--listen*
3. Check wireshark libvirt plugin:
Open menu: *Help* --> *About* *wireshark* --> *Plugins*. Libvirt plugin is
found:
*libvirt.so 4.1.0 dissector
/usr/lib/x86_64-linux-gnu/w…rk/plugins/2.4.5/libvirt.so*
4. Set wireshark listening on *lo* interface and filter as
'tcp.port==16509'. Execute virsh command via tcp protocol:
$ virsh -c qemu+tcp://localhost/system list
In wireshark, packets are parsed as TCP protocol. And I cannot find Libvirt
protocol in 'Decode as..' protocols list. And libvirt protocol is also not
found in *Edit* --> *Preference* --> *Protocols*.
So it seems libvirt packets are not dissected as libvirt protocol in
wireshark. How can I use the wireshark libvirt plugin?
--
Best regards,
-----------------------------------
Han Han
Quality Engineer
Redhat.
Email: hhan(a)redhat.com
Phone: +861065339333 <+86%2010%206533%209333>
6 years, 1 month
[libvirt-users] nwfilter multiple IPs
by Andre Goree
I'm trying to apply a nwfilter rule for two networks on the same guest
interface, like so:
~ # virsh nwfilter-dumpxml 1081532-private-both
<filter name='1081532-private-both' chain='root'>
<uuid>16004b94-2b62-4568-9467-169908eb4040</uuid>
<rule action='accept' direction='in' priority='500'>
<ip srcipaddr='10.25.104.0' srcipmask='24'/>
</rule>
<rule action='accept' direction='in' priority='600'>
<ip srcipaddr='10.117.50.0' srcipmask='24'/>
</rule>
<rule action='drop' direction='in' priority='1000'/>
</filter>
Within the guest, the IPs are both setup on one interface, with the IP
for second network (10.117.50.0/24) configured as an alias, like so:
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
state UP group default qlen 1000
link/ether 00:00:0a:d0:4e:f3 brd ff:ff:ff:ff:ff:ff
inet 10.25.104.1/24 brd 10.25.104.255 scope global eth1
valid_lft forever preferred_lft forever
inet 10.117.50.1/24 brd 10.117.50.255 scope global eth1:0
valid_lft forever preferred_lft forever
inet6 fe80::200:aff:fed0:4ef3/64 scope link
valid_lft forever preferred_lft forever
The problem I'm running into is that after applying the nwfilter, I
cannot reach the second network, only the first. Is this an issue with
both IPs being on the same interface? The machine I'm attempting to
reach has the same exact configuration -- i.e. it has an IP on the same
network for both networks.
Thanks in advance for any advice that can be given.
--
Andre Goree
-=-=-=-=-=-
Email - andre at drenet.net
Website - http://blog.drenet.net
PGP key - http://www.drenet.net/pubkey.html
-=-=-=-=-=-
6 years, 1 month
