Detect Xen and KVM

drmike

Well we have an OpenVZ thread....

How does one detect Xen and KVM from a bash script?

dmmcintyre3

KVM will show something like "model name : QEMU Virtual CPU version 0.9.1" in /proc/cpuinfo

Xen (PV)'s disks will be called something like /dev/xvda1

yomero

If I remember well, Xen has a folder /proc/xen or something like that

drmike

Thanks. It was just a thought to throw this up there since we were discussing it.

miTgiB

Xen PV will be running kernel-xen

tux

miTgiB said: Xen PV will be running kernel-xen

Or distro's default kernel with pygrub

miTgiB

tux said: Or distro's default kernel with pygrub

If it is a Xen PV, it will be running kernel-xen or it won't be running, whether the shared host kernel or via pygrub. Unless something has changed in the past few months since I stopped running Xen

Mon5t3r

Xen HVM > cat /proc/cpuinfo | grep hypervisor or egrep 'hypervisor' --color=always /proc/cpuinfo

should be showing hypervisor not xmv/svm

drmike

My understanding of the original question was how does one detect the environment from within a script.

At least that's how I understood it.

TigersWay

@drmike. if you are referring to my own original question, so yes, it is! Because openvz naturally lacks part of the kernel, and it may be important in some installation/optimization scripts.

But as I've never (yet) tried any Xen or KVM, I'm not sure it has the same importance. I guess I'll have to wake up for the next buyvm order time :-)

But please, you're an adept of full virtualization; enlight me! :-)

MrAndroid

http://www.dmo.ca/blog/detecting-virtualization-on-linux/

I think that answers your entire question.

maxexcloo

Thanks for that link!

craigb

the util-linux package on ubuntu includes lscpu which shows hypervisor vendor and virt. type....

example output on KVM:

root@localhost:~# lscpu
Architecture:          x86_64
CPU op-mode(s):        64-bit
CPU(s):                1
Thread(s) per core:    1
Core(s) per socket:    1
CPU socket(s):         1
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 2
Stepping:              3
CPU MHz:               2533.634
Hypervisor vendor:     KVM
Virtualisation type:   full
L1d cache:             32K
L1i cache:             32K
L2 cache:              4096K

ErawanArifNugroho

One year bump?

craigb

Stumbled across this thread in a google search (ranks high when searching for how to detect virt type). Thought this might help someone....apologies if its seen as noise.

Ash_Hawkridge

Drmikes posts keep getting resurrected.. its a sign :P

NanoG6

@GetKVM_Ash said: its a sign

Yes it is. Brace yourself..

gbshouse

http://linux.die.net/man/1/virt-what
Download the source code and use the same commands of just apt-get install virt-what

birdie25

Made me think drmike was back.

DanielM

@birdie25 said: Made me think drmike was back.

Me too haha i think most of us miss the good old doc.

vedran

Actually this is useful. Thanks for bumping

Taz

Anyone here can contact drmike?

Mon5t3r

i still have his email and some couple of his details (address, phone, etc) and maybe many people here's too. but i think i would not contact him for honor his decision about leaving.

Taz

@Mon5t3r said: i still have his email and some couple of his details (address, phone, etc) and maybe many people here's too. but i think i would not contact him for honor his decision about leaving.

Come on! The reason he left is no longer here. It is always nice to see fine people making contribution.

NanoG6

If we mention him like this @drmike, is he still receiving the notification email?