An interesting question. I have logged into a Linux (most likely SuSE) host. Is there some way that I can tell programmatically that I am a VM host or not?
Also assume that the vmtools are not installed.
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Use standard Linux tools to inspect the hardware on the system.
ethtool -i eth0
dmidecode | grep -i vmware
If the output of these commands shows hardware with a manufacturer name of "VMWare", you're on a VMWare VM. Multiple commands are provided here because system configurations and tools differ.
There is a handy app that might help called virt-what. I haven't used it with VMWare, but it did work nicely with Qemu.
You might be able to get and idea by looking around under
/sys. For example
/sys/class/dmi/id/sys_vendor has a value of
If it is installed you can use lshw. The command
lshw -class system returns this on my system:
server1 description: Computer product: VMware Virtual Platform vendor: VMware, Inc. version: None serial: VMware-... width: 64 bits capabilities: smbios-2.4 dmi-2.4 vsyscall64 vsyscall32
Some virtual environments name some of their virtual devices with names that are a bit tell-tale, for example, VirtualBox presenting a graphics card that calls itself "VirtualBox Display Adapter". But looking for those ties you to a particular VM and possibly a narrow range of versions.
It might be possible for your code to see what sort of virtualisation it could set up. If that fails entirely, you might be in a VM. But you just as might easily be on a box that doesn't have any VM capable hardware.
For Linux you type
dmesg |grep DMI:
[root@myhost ~]# dmesg |grep DMI DMI 2.3 present. DMI: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS 090006 05/23/2012 [root@myhost ~]# dmesg |grep -i virtual DMI: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS 090006 05/23/2012 Booting paravirtualized kernel on bare hardware input: Macintosh mouse button emulation as /devices/virtual/input/input1 scsi 0:0:0:0: Direct-Access Msft Virtual Disk 1.0 PQ: 0 ANSI: 4 input: Microsoft Vmbus HID-compliant Mouse as /devices/virtual/input/input4
[root@backdev1 ~]# dmesg |grep DMI DMI 2.5 present. DMI: IBM System x3650 M3 -[7945AC1]-/90Y4784, BIOS -[D6E153AUS-1.12]- 06/30/2011
You could also search the first part of your mac address here and see if it's listed as assigned to any of the virtualization companies.
In Linux, system information is revealed in /sys/devices/virtual/dmi/id/ . See my answer here for a handy script to show you all the information available.
root not required.
I didn't like any of these solutions, as there's usually a VMware CDROM driver or memory driver installed so dmesg confirms or denies it for me quickly.
[server@user ~]$ dmesg |grep VMware hda: VMware Virtual IDE CDROM Drive, ATAPI CD/DVD-ROM drive Vendor: VMware Model: Virtual disk Rev: 1.0 Vendor: VMware Model: Virtual disk Rev: 1.0 Vendor: VMware Model: Virtual disk Rev: 1.0 Vendor: VMware Model: Virtual disk Rev: 1.0 Vendor: VMware Model: Virtual disk Rev: 1.0 Vendor: VMware Model: Virtual disk Rev: 1.0 Vendor: VMware Model: Virtual disk Rev: 1.0 VMware memory control driver initialized
This worked better for me as it gives me specific information about the manufacturer and the product name.
dmidecode -t system|grep 'Manufacturer\|Product'
Output on Dell server:
Manufacturer: Dell Inc. Product Name: PowerEdge C5220
Output on Virtualbox VM:
Manufacturer: innotek GmbH Product Name: VirtualBox
Output on KVM/QEMU:
Manufacturer: QEMU Product Name: Standard PC (i440FX + PIIX, 1996)
This is great for scripts that can parse these out for better identification of servers... but if you use Chef in your infrastructure, you can check the node attribute
Virtualization -> system in the chef server .
I like very much:
hostnamectl status | grep "Chassis:"