如何判断虚拟机采用哪种虚拟化技术

如何判断 Linux VM 采用哪种虚拟化技术

virt-what

安装

apt install virt-what

yum install virt-what

使用

$ virt-what
kvm

输出：

• aws : Amazon Web Services
• docker : This is a Docker container.
• hyperv : This is Microsoft Hyper-V hypervisor.
• lxc : This process is running in a Linux LXC container.
• kvm : This guest is running on the KVM hypervisor using hardware acceleration.
• openvz : The guest appears to be running inside an OpenVZ or Virtuozzo container.
• parallels : The guest is running inside Parallels Virtual Platform (Parallels Desktop, Parallels Server).
• qemu : This is QEMU hypervisor using software emulation.
• virt : Some sort of virtualization appears to be present, but we are not sure what it is.
• virtualbox : This is a VirtualBox guest.
• vmware : The guest appears to be running on VMware hypervisor.
• xen The guest appears to be running on Xen hypervisor.
• xen-hvm : This is a Xen guest fully virtualized (HVM).

更多内容见：man virt-what

dmidecode

$ dmidecode -s system-manufacturer
VMware, Inc.
$ dmidecode -s system-product-name
VMware7,1

systemd-detect-virt

# apt install systemd -y
$ systemd-detect-virt
vmware

docker

• 根目录会生产 /.dockerenv 文件
• 通过 /proc/1/cgroup 和 /proc/1/cpuset 检查是否有 docker 字段

$ cat /proc/1/cgroup | grep docker
13:blkio:/docker/582fd9275fbffd1b9f2c716eead28da399f54c7792b38d74fd82d5eb6bc3421f
11:devices:/docker/582fd9275fbffd1b9f2c716eead28da399f54c7792b38d74fd82d5eb6bc3421f
10:cpu,cpuacct:/docker/582fd9275fbffd1b9f2c716eead28da399f54c7792b38d74fd82d5eb6bc3421f
9:hugetlb:/docker/582fd9275fbffd1b9f2c716eead28da399f54c7792b38d74fd82d5eb6bc3421f
8:memory:/docker/582fd9275fbffd1b9f2c716eead28da399f54c7792b38d74fd82d5eb6bc3421f
7:perf_event:/docker/582fd9275fbffd1b9f2c716eead28da399f54c7792b38d74fd82d5eb6bc3421f
5:cpuset:/docker/582fd9275fbffd1b9f2c716eead28da399f54c7792b38d74fd82d5eb6bc3421f
4:freezer:/docker/582fd9275fbffd1b9f2c716eead28da399f54c7792b38d74fd82d5eb6bc3421f
3:net_cls,net_prio:/docker/582fd9275fbffd1b9f2c716eead28da399f54c7792b38d74fd82d5eb6bc3421f
2:pids:/docker/582fd9275fbffd1b9f2c716eead28da399f54c7792b38d74fd82d5eb6bc3421f
1:name=systemd:/docker/582fd9275fbffd1b9f2c716eead28da399f54c7792b38d74fd82d5eb6bc3421f
$ cat /proc/1/cpuset
/docker/582fd9275fbffd1b9f2c716eead28da399f54c7792b38d74fd82d5eb6bc3421f

• /proc/1/sched 中若不是 systemd 也可能是 docker 容器

$ cat /proc/1/sched
bash (1, #threads: 1)
...

k8s pod

k8s 启动的容器，init 进程 一般为 /pause，如下图

$ ps -ef
PID   USER     TIME  COMMAND
    1 root      0:00 /pause