Check if a virtual machine is running on Linux.

In a Linux system, you can determine if the system is running in a virtual machine by inspecting specific files or using commands. Here are some common methods:

1. Check the /sys/class/dmi/id/product_name file: This file contains the system’s product name information. If it contains keywords such as “VirtualBox”, “VMware”, or “QEMU”, then the system is running on the corresponding virtual machine.

For example, you can use the following command to view the content of the file:

cat /sys/class/dmi/id/product_name

1. By utilizing the dmidecode command, you can display the Desktop Management Interface (DMI) information of the system, including detailed hardware and system information. By examining the “Manufacturer” and “Product Name” fields in the “System Information” section, you can determine if the current system is a virtual machine.

You can use the following command to execute the dmidecode command and find relevant information:

sudo dmidecode | grep -iE 'manufacturer|product'

1. To detect if the current system is running in a virtual machine, use the command line tool virt-what. You can install and run virt-what by using the following command:
2. Install virt-what using the sudo apt-get command, specifically for Debian-based distributions. Then run virt-what using sudo.
3. If the output of the virt-what command contains keywords such as “vmware”, “kvm”, or “qemu”, then it indicates that the current system is running in the corresponding virtual machine.

It should be noted that none of the methods above are completely reliable, as virtual machines may potentially hide or modify the respective information in certain cases.