method 1:

dmesg | grep -i virtual

展示效果
物理机：

[    0.000000] Booting paravirtualized kernel on bare hardware

虚拟机：

[    0.000000] Booting paravirtualized kernel on KVM
[    0.888762] KVM setup paravirtual spinlock
[    2.404309] input: VirtualPS/2 VMware VMMouse as /devices/platform/i8042/serio1/input/input2
[    2.407844] input: VirtualPS/2 VMware VMMouse as /devices/platform/i8042/serio1/input/input3
[    2.507579] systemd[1]: Detected virtualization kvm.

method 2:

dmidecode -s system-product-name

物理机：

ThinkSystem SR650 -[7X06CT01WW]-

虚拟机：

OpenStack Compute

method 3:

cat /proc/scsi/scsi

物理机：

虚拟机：

Attached devices:
<>

method 4:

lscpu | grep Hypervisor