Detect OpenVZ & LEB scripts

TigersWay

Hi,

Trying to "improve" or complete some fork of the famous LEB script, I would like to confirm the virtualization system, or at least detect not-true virtualization: OpenVZ. But for now, I can only check on a non-virtualized server, a vmware instance and some openvz vps...

grep envID /proc/self/status should return non-zero envID for OpenVZ and OpenVZ only. Is that correct?

Thanks

maxexcloo

I use the code on line #260 here: https://github.com/maxexcloo/Minimal/blob/master/minimal.sh

Boltersdriveer

On OpenVZ VPS:

[root@tnm ~]# grep envID /proc/self/status

envID: 113

On non-OpenVZ server:

[root@eclipse ~]# grep envID /proc/self/status

envID: 0

LowEndAdmin

What @maxexcloo said. OpenVZ VPS would have /proc/bc or /proc/user_beancounters set. Just check for their existence.

miTgiB

LowEndAdmin said: OpenVZ VPS would have /proc/bc or /proc/user_beancounters set

No longer exists in containers on a CentOS 6 node

[root@ovz03 ~]# vzctl enter 710
entered into CT 710
root@ns101 [/]# cat /proc/bc
cat: /proc/bc: No such file or directory
root@ns101 [/]# cat /proc/bean_counters
cat: /proc/bean_counters: No such file or directory
root@ns101 [/]# uname -a
Linux ns101.hostigation.com 2.6.32-042stab031.1 #1 SMP Fri Aug 12 21:20:56 MSD 2011 i686 i686 i386 GNU/Linux
root@ns101 [/]#

I was wrong, user_beancounters is still there.

Keith

In my version of lowendscript https://github.com/Keith2/lowendscript

I'm creating a conf file, if using OpenVZ is defined here instead of detecting it.

LowEndAdmin

@miTgiB -- yeah. I have a Hostigation VPS and /proc/user_beancounters is definitely there

dmmcintyre3

grep envID /proc/self/status returns:



Nothing on a KVM VPS with standard kernel

envID: 0 on a real server with openvz kernel

envID: 110 on a VPS on that server.

yomero

dmmcintyre3 said: Nothing on a KVM VPS with standard kernel

Yep, and also nothing in a real machine.

dmmcintyre3

@maxexcloo: your script incorrectly identifies my old laptop as a OpenVZ VPS. (since it's running the OpenVZ kernel, those files exist outside of VPSs too)

maxexcloo

Any idea's how I could fix that?
I don't have much of an idea right now

LowEndAdmin

There are other directories that might be on an OpenVZ. For example /proc/vz. An empty /boot (although it could be easily populated with junks). Also the rootfs is usually mounted as simfs (not always the case though). For example

grep ' / simfs' /proc/mounts