举例如下：
###这是阿里云的云主机
[root@xxx ~]# dmesg |grep -i virtual
[ 0.000000] Booting paravirtualized kernel on KVM
[ 0.707486] KVM setup paravirtual spinlock
[ 1.811087] input: VirtualPS/2 VMware VMMouse as /devices/platform/i8042/serio1/input/input2
[ 1.811257] input: VirtualPS/2 VMware VMMouse as /devices/platform/i8042/serio1/input/input3
[ 1.824106] systemd[1]: Detected virtualization kvm.
[ 1.853583] systemd[1]: Starting Setup Virtual Console...###这是一台物理机
[root@xxx]# dmesg |grep -i virtual
Booting paravirtualized kernel on bare hardware
input: Macintosh mouse button emulation as /devices/virtual/input/input1
方法二：dmidecode
举例如下：
###这是阿里云的云主机
[root@xxx~]# dmidecode -s system-product-name
Alibaba Cloud ECS###这是一台物理机
[root@xxx]# dmidecode -s system-product-name
PowerEdge R720
