From 91516b127a975f27df5a310dd3f0345487bec5fb Mon Sep 17 00:00:00 2001 From: zjon Date: Fri, 29 Dec 2017 23:01:36 +0800 Subject: [PATCH] translated --- ...tualization in KVM on CentOS 7 - RHEL 7.md | 117 ------------------ 1 file changed, 117 deletions(-) delete mode 100644 sources/tech/20171212 How to enable Nested Virtualization in KVM on CentOS 7 - RHEL 7.md diff --git a/sources/tech/20171212 How to enable Nested Virtualization in KVM on CentOS 7 - RHEL 7.md b/sources/tech/20171212 How to enable Nested Virtualization in KVM on CentOS 7 - RHEL 7.md deleted file mode 100644 index 09016734af..0000000000 --- a/sources/tech/20171212 How to enable Nested Virtualization in KVM on CentOS 7 - RHEL 7.md +++ /dev/null @@ -1,117 +0,0 @@ -zjon Translating -How to enable Nested Virtualization in KVM on CentOS 7 / RHEL 7 -====== -**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). - -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 - -Let's jump into the hypervisor and verify whether nested virtualization is enabled or not on your KVM host - -For Intel based Processors run the command, -``` -[root@kvm-hypervisor ~]# cat /sys/module/kvm_intel/parameters/nested -N -[root@kvm-hypervisor ~]# -``` - -For AMD based Processors run the command, -``` -[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. - -Now to enable nested virtualization, create a file with the name " **/etc/modprobe.d/kvm-nested.conf** " with the following content. -``` -[root@kvm-hypervisor ~]# vi /etc/modprobe.d/kvm-nested.conf -options kvm-intel nested=1 -options kvm-intel enable_shadow_vmcs=1 -options kvm-intel enable_apicv=1 -options kvm-intel ept=1 -``` - -Save & exit the file - -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** " -``` -[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. -``` -[root@kvm-hypervisor ~]# cat /sys/module/kvm_intel/parameters/nested -Y -[root@kvm-hypervisor ~]# -``` - -#### - -Test Nested Virtualization - -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 - -![cpu_mode_vm_kvm][1] - -![cpu_mode_vm_kvm][2] - -Now login to the director VM and run lscpu and lsmod command -``` -[root@kvm-hypervisor ~]# ssh 192.168.126.1 -l root -root@192.168.126.1's password: -Last login: Sun Dec 10 07:05:59 2017 from 192.168.126.254 -[root@director ~]# lsmod | grep kvm -kvm_intel             170200  0 -kvm                   566604  1 kvm_intel -irqbypass              13503  1 kvm -[root@director ~]# -[root@director ~]# lscpu -``` - -![lscpu_command_rhel7_centos7][1] - -![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 -``` -[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... -Retrieving file .treeinfo...                                                   | 1.1 kB  00:00:00 -Retrieving file vmlinuz...                                                     | 4.9 MB  00:00:00 -Retrieving file initrd.img...                                                  |  37 MB  00:00:00 -Allocating 'nestedvm.img'                                                      |  10 GB  00:00:00 -Connected to domain Nested-VM -Escape character is ^] -[    0.000000] Initializing cgroup subsys cpuset -[    0.000000] Initializing cgroup subsys cpu -[    0.000000] Initializing cgroup subsys cpuacct -[    0.000000] Linux version 3.10.0-327.el7.x86_64 (builder@kbuilder.dev.centos.org) (gcc version 4.8.3 20140911 (Red Hat 4.8.3-9) (GCC) ) #1 SMP Thu Nov 19 22:10:57 UTC 2015 -……………………………………………… -``` - -![cli-installer-virt-install-command-kvm][1] - -![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. - -This Concludes the article, please do share your feedback and comments. - --------------------------------------------------------------------------------- - -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) -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 - -[a]:https://www.linuxtechi.com -[1]:https://www.linuxtechi.com/wp-content/plugins/lazy-load/images/1x1.trans.gif -[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