[KVM] Calculation of the number of virtual machines on a single node.
by Vladimir Parf
Hello!
I'm starting to deploy a private cloud on OpenStack! As the hypervisor
I use nova+KVM on Fedora-19.
Tell me how to count how many virtual machines can be placed on a single
KVM node.
How to count the number of virtual machines on single node to get
everything working perfectly?
Hardware configuration:
CPU: 2x Intel(R) Xeon(R) CPU E5-2609 @ 2.40GHz - 4 core
RAM: 96 GB
HDD:Unlimited
HW: ProLiant BL460c
10 years, 8 months
why isnt loop mounted iso not been seen/used
by fp.to.anomalyst＠xoxy.net
the local path on the host is "/media/cdrom" and an ls shows the expected
files/directories.
I get a "no boot device" error on the console from the following script:
http://www.fpaste.org/34713/86971137/
am trying to do a minimal Centos 6.4 unattended install.
Using --cdrom tells me I can use extra-args to supply the kickstart.
Without the kickstart I have to respond on the console.
TIA, Bob
10 years, 8 months
device='disk' and DISCARD
by Ian Pilcher
I just noticed the new "Virtio SCSI disk" and "Virtio SCSI lun" storage
types in virt-manager (and their libvirt XML device=... equivalents).
Reading up on them, I see that "generic" SCSI commands are only accepted
when device='lun', but this only works when the source is an "actual raw
device" -- not an LVM LV or partition.
Does this mean that DISCARD commands are rejected when device='disk'?
I've been using SSD-backed LVs as virtio-scsi disks, with the idea that
this would cause DISCARD commands to be passed through from the guests.
It would be a real bummer if there were no way to do this.
Thanks!
--
========================================================================
Ian Pilcher arequipeno(a)gmail.com
Sometimes there's nothing left to do but crash and burn...or die trying.
========================================================================
10 years, 8 months
Current Status of LVM Snapshots & Libvirt
by Jorge Fábregas
Hi,
What's the current status of LVM snapshots? Can you
create/revert/commit them with virsh? Or is this an out of band
operation (I have to manually use lvcreate etc...)?
I've never used LVM-based images mainly because you couldn't overcommit
the storage subsystem but now, with the new thin-provisioning
capabilities of LVM, I'm willing to give it a try. That is, of course,
*only* If I can still have all the nice snapshot capabilities I
currently have with qcow2-based images :)
Thanks,
Jorge
p.d I know you can create qcow2 overlays out of an LVM. My question
really is whether libvirt can use/manipulate native LVM snapshots these
days.
10 years, 8 months
Nested KVM help
by James Slagle
Hi,
When I try to use nested KVM with Fedora 19, I'm experiencing a hang of the L1
vm. I eventually have to do a "Force Off" from virt-manager on L0 since the L1
vm is completely unresponsive.
Both my L0 and L1 are F19, x86_64. L2 doesn't really seem to matter as I can't
even get the guest to start before L1 completely locks up. Even just
attempting to define a L2 guest that uses kvm virtualization locks up L1
completely.
Here are some more details.
On L0 (i've rebooted L0 after enabling the nested parameter):
[root@dublin ~]# uname -a
Linux dublin 3.10.7-200.fc19.x86_64 #1 SMP Thu Aug 15 23:19:45 UTC 2013 x86_64
x86_64 x86_64 GNU/Linux
[root@dublin ~]# cat /sys/module/kvm_intel/parameters/nested
Y
[root@dublin ~]# rpm -q libvirt
libvirt-1.0.5.5-1.fc19.x86_64
[root@dublin ~]# lsmod | grep kvm
kvm_intel 138528 3
kvm 422809 1 kvm_intel
cpu section of libvirt xml for L1 vm:
<cpu mode='custom' match='exact'>
<model fallback='allow'>Nehalem</model>
<feature policy='require' name='vmx'/>
</cpu>
On L1:
[root@localhost jslagle]# uname -a
Linux localhost.localdomain 3.10.7-200.fc19.x86_64 #1 SMP Thu Aug 15 23:19:45
UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
[root@localhost jslagle]# rpm -q libvirt
libvirt-1.0.5.5-1.fc19.x86_64
[root@localhost jslagle]# lsmod | grep kvm
kvm_intel 138528 0
kvm 422809 1 kvm_intel
I've looked in dmesg output, /var/log/messages, and libvirt logs on both L0 and
L1 and can't see any errors.
Any ideas on how to debug this further?
Let me know if should file a bugzilla, I wasn't sure I had enough to go on to
go ahead and do that yet.
Thanks for any help.
--
-- James Slagle
--
10 years, 8 months
KVM bridge wonkiness in Fedora19
by Lonni J Friedman
Greetings,
I'm attempting to get several virtual machines setup on a Fedora19
host system, with the traditional bridge network devices (br0, br1,
etc). I've done this many times before with older versions of Fedora
(16, 14, etc), and it just works. However, for reasons that I cannot
figure out, the bridge doesn't seem to be working in Fedora19. While
I can successfully connect to the outside world (local network +
internet) from inside a VM, nothing can communicate with the VM from
outside (local network). I'm referring to something as trivial as
pinging. From inside the VM, I can ping anything successfully (0%
packet loss). However, from outside the VM (on the host, or any other
system on the same network), I see 100% packet loss when pinging the
IP address of the VM.
My first question is simply, does anyone else have this working
successfully in F19? And if so, what steps did you need to follow?
I'm not using NetworkManager at all, its all the network service.
There are no firewalls involved anywhere (iptables & firewall services
are currently disabled). Here's the current host configuration:
# brctl show
bridge name bridge id STP enabled interfaces
br0 8000.38eaa792efe5 no em2
vnet1
br1 8000.38eaa792efe6 no em3
br2 8000.38eaa792efe7 no em4
vnet0
virbr0 8000.525400db3ebf yes virbr0-nic
# more /etc/sysconfig/network-scripts/ifcfg-em2
TYPE=Ethernet
BRIDGE="br0"
NAME=em2
DEVICE="em2"
UUID=aeaa839e-c89c-4d6e-9daa-79b6a1b919bd
ONBOOT=yes
HWADDR=38:EA:A7:92:EF:E5
NM_CONTROLLED="no"
# more /etc/sysconfig/network-scripts/ifcfg-br0
TYPE=Bridge
NM_CONTROLLED="no"
BOOTPROTO=dhcp
NAME=br0
DEVICE="br0"
ONBOOT=yes
# ifconfig em2 ;ifconfig br0
em2: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet6 fe80::3aea:a7ff:fe92:efe5 prefixlen 64 scopeid 0x20<link>
ether 38:ea:a7:92:ef:e5 txqueuelen 1000 (Ethernet)
RX packets 100093 bytes 52354831 (49.9 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 25321 bytes 15791341 (15.0 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device memory 0xf7d00000-f7e00000
br0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.31.99.226 netmask 255.255.252.0 broadcast 10.31.99.255
inet6 fe80::3aea:a7ff:fe92:efe5 prefixlen 64 scopeid 0x20<link>
ether 38:ea:a7:92:ef:e5 txqueuelen 0 (Ethernet)
RX packets 19619 bytes 1963328 (1.8 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 11 bytes 1074 (1.0 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
Relevant section from /etc/libvirt/qemu/foo.xml (one of the VMs with
this problem):
<interface type='bridge'>
<mac address='52:54:00:26:22:9d'/>
<source bridge='br0'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03'
function='0x0'/>
</interface>
I can provide additional information, if requested. thanks!
10 years, 8 months
Re: [fedora-virt] [virt-tools-list] Missing networks & Virt-Manager
by Jorge Fábregas
On 08/05/2013 05:22 PM, Cole Robinson wrote:
> Okay, I was a bit confused before since you mentioned restarting the host. But
> the above makes more sense. virt-manager only refreshes the forward device
> list in that wizard when it is first run, we should be at least doing it every
> time the wizard is launched. I've fixed that upstream now but it likely won't
> ever trickle into RHEL6 FWIW.
There you go. Thanks for fixing it upstream. I'm really looking
forward to Fedora 20 ... and specially the upcoming snapshot
functionality :)
Regards,
Jorge
10 years, 8 months
Fedora virt status July 2013
by Cole Robinson
Hi all, here are some Fedora virt status bits for July.
Fedora 20
=========
The 'Change' submission deadline came and went, and 3 virt changes
were accepted:
https://fedoraproject.org/wiki/Changes/Virt_ACLs
https://fedoraproject.org/wiki/Changes/Virt_Manager_Snapshots
https://fedoraproject.org/wiki/Changes/Virt_ARM_on_x86
Here's the remaining schedule:
https://fedoraproject.org/wiki/Releases/20/Schedule
Aug 06: Change freeze, must be functional
Aug 20: Alpha deadline
Sep 03: Alpha release
Sep 24: Beta deadline
Oct 08: Beta release
Nov 12: GA release
The change freeze next week is also when F20 branches off from
rawhide, so F20 will start to get some differentiation.
Fedora 17 EOL
=============
Fedora 17 is End-of-Life now, which means no more updates are being
shipped. If you're still on Fedora 17, now's a good time make the
jump to F19!
libvirt 1.1.0 and 1.1.1
=======================
Two libvirt releases this month: 1.1.0 on July 1st 2013 and 1.1.1 on
July 30th 2013. Highlights:
1.1.0:
* Extensible migration APIs (Jiri Denemark)
* Add a policy kit access control driver (Daniel P. Berrange)
* various improvements in the Xen driver (Jim Fehlig and Marek
Marczykowski-Górecki)
* improve networking support on BSD (Roman Bogorodskiy)
* agent based vCPU hotplug support (Peter Krempa)
1.1.1:
* Adding device removal or deletion events (Jiri Denemark),
* Introduce new domain create APIs to pass pre-opened FDs to LXC (Daniel P.
Berrange),
* Add interface versions for Xen 4.3 (Stefan Bader),
* Add new public API virDomainSetMemoryStatsPeriod (John Ferlan),
* Various LXC improvements (Daniel P. Berrange and Gao feng)
seabios 1.7.3
=============
seabios 1.7.3 was released on July 7th and is currently in rawhide and
virt-preview.
- Initial support for using SeaBIOS as a UEFI CSM
- Support for detecting and using ACPI reboot ports.
- Non-standard floppy sizes now work again with recent QEMU versions.
- Several bug fixes and code cleanups
Bug stats
=========
Bug count on Jul 1 2013 : 266
Bug count on Aug 1 2013 : 218
Quite the substantial drop this month, but that's largely due to the
F17 EOL mass closings, and some housekeeping keeping throughout the
month in anticipation of the mass closing.
By release:
* Fedora 18 : 86
* Fedora 19 : 102
* Fedora rawhide : 30
By package:
* gnome-boxes : 33
* ipxe : 2
* libguestfs : 8
* libosinfo : 7
* libvirt : 38
* libvirt-sandbox : 21
* netcf : 7
* qemu : 34
* seabios : 1
* spice-gtk : 2
* spice-vdagent : 1
* usbredir : 1
* virt-dmesg : 1
* virt-manager : 29
* virt-viewer : 7
* virt-what : 3
* virtio-win : 3
* xen : 4
* xorg-x11-drv-cirrus: 4
* xorg-x11-drv-qxl : 12
By status:
* ASSIGNED : 18
* MODIFIED : 2
* NEW : 188
* POST : 10
Bugs of note
============
https://bugzilla.redhat.com/show_bug.cgi?id=980254
Host crash when shutting down KVM VMs
A bad patch for 880035 was causing pretty reliable host crashes when
shutting down VMs. At least F18 and F19 were affected.
- Cole
10 years, 9 months
