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zjon translating (20171212 How to enable Nested Virtualization in KVM on CentOS 7 - RHEL 7.md
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sources/tech/20171212 How to enable Nested Virtualization in KVM on CentOS 7 - RHEL 7.md → translated/tech/20171212 How to enable Nested Virtualization in KVM on CentOS 7 - RHEL 7.md
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How to enable Nested Virtualization in KVM on CentOS 7 / RHEL 7
zjon Translating
如何在 CentOS 7 / RHEL 7 的 KVM 上启用嵌套虚拟化
======
**Nested virtualization** means to configure virtualization environment inside a virtual machine. In other words we can say nested virtualization is a feature in the hypervisor which allows us to install & run a virtual machine inside a virtual server via hardware acceleration from the **hypervisor** (host).
**嵌套虚拟化**意味着在虚拟机内配置虚拟化环境。换句话说，我们可以说嵌套虚拟化是虚拟机管理程序的一个特性，它允许我们通过**虚拟化管理程序**（主机）的硬件加速在虚拟服务器内安装核运行虚拟机。
In this article, we will discuss how to enable nested virtualization in KVM on CentOS 7 / RHEL 7. I am assuming you have already configured KVM hypervisor. In case you have not familiar on how to install and configure **KVM hypervisor** , then refer the following article
在这篇文章中，我们将讨论如何在 CentOS 7 / RHEL 7 的 KVM 上启用嵌套虚拟化。我假定您已经配置过 KVM 管理程序。如果您不熟悉如何安装和配置 KVM 管理程序，请参考一下文章。
Let's jump into the hypervisor and verify whether nested virtualization is enabled or not on your KVM host
让我们跳进虚拟化管理程序，验证您的 KVM 主机是否启用了嵌套虚拟化。
For Intel based Processors run the command,
基于 Intel 的处理器运行以下命令，
```
[root@kvm-hypervisor ~]# cat /sys/module/kvm_intel/parameters/nested
N
[root@kvm-hypervisor ~]#
```
For AMD based Processors run the command,
基于 AMD 的处理器运行以下命令，
```
[root@kvm-hypervisor ~]# cat /sys/module/kvm_amd/parameters/nested
N
[root@kvm-hypervisor ~]#
```
In the above command output 'N' indicates that Nested virtualization is disabled. If we get the output as 'Y' then it indicates that nested virtualization is enabled on your host.
一下命令输出 'N' 表示嵌套虚拟化是禁用的。如果我们得到的输出是 'Y' 则表示在您的主机已启用嵌套虚拟化
Now to enable nested virtualization, create a file with the name " **/etc/modprobe.d/kvm-nested.conf** " with the following content.
现在启用嵌套虚拟化，使用以下内容创建一个文件名为 "**/etc/modprobe.d/kvm-nested.conf**" 的文件
```
[root@kvm-hypervisor ~]# vi /etc/modprobe.d/kvm-nested.conf
options kvm-intel nested=1
@ -31,16 +34,16 @@ options kvm-intel enable_apicv=1
options kvm-intel ept=1
```
Save & exit the file
保存并退出文件
Now remove ' **kvm_intel** ' module and then add the same module with modprobe command. Before removing the module, make sure VMs are shutdown otherwise we will get error message like " **modprobe: FATAL: Module kvm_intel is in use** "
现在移除 '**kvm_intel**' 模块然后通过 modprobe 命令添加同样的模块。在移除模块之前，确保虚拟机已关机，否则我们会得到像 "**modprobe: FATAL: Module kvm_intel is in use**" 这样的错误信息。
```
[root@kvm-hypervisor ~]# modprobe -r kvm_intel
[root@kvm-hypervisor ~]# modprobe -a kvm_intel
[root@kvm-hypervisor ~]#
```
Now verify whether nested virtualization feature enabled or not.
现在验证嵌套虚拟化功能是否启用。
```
[root@kvm-hypervisor ~]# cat /sys/module/kvm_intel/parameters/nested
Y
@ -49,15 +52,16 @@ Y
####
Test Nested Virtualization
测试嵌套虚拟化
Let's suppose we have a VM with name "director" on KVM hypervisor on which I have enabled nested virtualization. Before testing, make sure CPU mode for the VM is either as " **host-model** " or " **host-passthrough** " , to check cpu mode of a virtual machine use either Virt-Manager GUI or virsh edit command
假设我们在 KVM 管理程序上有一台名为 "director" 的虚拟机，我已经启用了嵌套虚拟化。在测试之前，确保 CPU 模式为 "host-modle" 或 "host-passthrough" ,使用 Virt-Manager 或 virtsh 编译命令检查虚拟机 cpu 模式。
![cpu_mode_vm_kvm][1]
![cpu_mode_vm_kvm][2]
Now login to the director VM and run lscpu and lsmod command
现在登录 director 这台虚拟机并运行 lscpu 和 lsmod 命令
```
[root@kvm-hypervisor ~]# ssh 192.168.126.1 -l root
root@192.168.126.1's password:
@ -74,7 +78,8 @@ irqbypass              13503  1 kvm
![lscpu_command_rhel7_centos7][3]
Let's try creating a virtual machine either from virtual manager GUI or virt-install inside the director vm, in my case i am using virt-install command
让我们试着在 director 这台虚拟机的虚拟管理器 GUI 或 virt-install 创建一台虚拟机，在我的情况下我使用 virt-install 命令
```
[root@director ~]# virt-install  -n Nested-VM  --description "Test Nested VM"  --os-type=Linux  --os-variant=rhel7  --ram=2048  --vcpus=2  --disk path=/var/lib/libvirt/images/nestedvm.img,bus=virtio,size=10  --graphics none  --location /var/lib/libvirt/images/CentOS-7-x86_64-DVD-1511.iso --extra-args console=ttyS0
Starting install...
@ -95,16 +100,16 @@ Escape character is ^]
![cli-installer-virt-install-command-kvm][4]
This confirms that nested virtualization has been enabled successfully as we are able to create virtual machine inside a virtual machine.
这证实了嵌套虚拟化已成功启用，因为我们能在虚拟机内创建虚拟机。
This Concludes the article, please do share your feedback and comments.
这篇文章到此结束，请分享您的反馈和意见。
--------------------------------------------------------------------------------
via: https://www.linuxtechi.com/enable-nested-virtualization-kvm-centos-7-rhel-7/
作者：[Pradeep Kumar][a]
译者：[译者ID](https://github.com/译者ID)
译者：[zjon](https://github.com/zjon)
校对：[校对者ID](https://github.com/校对者ID)
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
@ -114,3 +119,5 @@ via: https://www.linuxtechi.com/enable-nested-virtualization-kvm-centos-7-rhel-7
[2]:https://www.linuxtechi.com/wp-content/uploads/2017/12/cpu_mode_vm_kvm.jpg
[3]:https://www.linuxtechi.com/wp-content/uploads/2017/12/lscpu_command_rhel7_centos7-1024x408.jpg
[4]:https://www.linuxtechi.com/wp-content/uploads/2017/12/cli-installer-virt-install-command-kvm.jpg