rhel7.2 server with GUI install kvm virtual machine

1. Check system version

[root@openstack ~]# cat /etc/centos-release

CentOS Linux release 7.4.1708 (Core) 

2. First, verify that the CPU supports virtualization, vmx or svm have input on the support, the support virtualization to support KVM

[root@openstack ~]# cat /proc/cpuinfo | egrep 'vmx|svm'

===========================================
3. Check whether the load KVM

[root@openstack ~]# lsmod | grep kvm
kvm_intel             170086  0 
kvm                   566340  1 kvm_intel
irqbypass              13503  1 kvm

This shows that has been loaded, if not loaded then execute the following command to load KVM

[root@openstack ~]# modprobe kvm

=============================================

4. Close selinux

[root@openstack ~]# setenforce 0
[root@openstack ~]# vim /etc/sysconfig/selinux 
SELINUX=disabled

5. KVM installation related packages

[root@openstack ~]# yum install qemu-kvm qemu-img virt-manager \
libvirt libvirt-python virt-manager \
libvirt-client virt-install virt-viewer -y

Explain the package name:
QEMU-KVM: KVM module
libvirt: a virtual management module
virt-manager: a graphical interface for managing virtual machines
virt-install: Virtual Machine command-line installation tool

6. Libvirt start and set the boot from the start

[root@openstack ~]# systemctl start libvirtd
[root@openstack ~]# systemctl enable libvirtd

7. Enter graphical (enter on behalf of half the battle!)

[root@openstack ~]# virt-manager

8. The back-end disk files, virtual machine template configuration files, network configuration files are copied into the need to create a virtual machine on a physical machine! !

scp /..../...   ip:/..../.....

9. Configure virtual network

Step one: create a virtual network called the vbr

[root@room9pc01 ~]# vim  /etc/libvirt/qemu/networks/vbr.xml
<network>
  <name>vbr</name>                //vbr为虚拟网络的名字
  <bridge name="vbr"/>
  <forward mode="nat"/>
  <ip address="192.168.1.254" netmask="255.255.255.0">        //本机网关ip为192.168.1.254
    <dhcp>
      <range start="192.168.1.100" end="192.168.1.200"/>     //虚拟机DHCP获取ip范围是100-200
    </dhcp>
  </ip>
</network>

Step Two: Start vbr virtual network and verify with ifconfig

[root@room9pc01 ~]# virsh net-define /etc/libvirt/qemu/networks/vbr.xml        //定义vbr虚拟网络，加载进virsh中
[root@room9pc01 ~]# virsh net-start vbr      //启动vbr虚拟网络
[root@room9pc01 ~]# ifconfig                //ifconfig验证
vbr: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.254  netmask 255.255.255.0  broadcast 192.168.1.255
        ether 52:54:00:b7:1c:10  txqueuelen 1000  (Ethernet)
        RX packets 2460  bytes 176958 (172.8 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1948  bytes 532542 (520.0 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

================================================== ==============
start virtual network problems may arise:

When open network vbr tips are as follows:

The name org.fedoraproject.FirewallD1 was not provided by any .service files

Approach: libvirtd service to restart

systemctl restart libvirtd

================================================================

Step three: Set vbr virtual network boot from the start

[root@room9pc01 ~]# virsh net-autostart vbr

10. Configure virtual machine storage file

Creating a new front end with back-end disk disk image file template

[root@room9pc01 ~]# cd /var/lib/libvirt/images/
[root@room9pc01 images]# qemu-img  create –b node.qcow2 –f qcow2 test.img

11. Configure the virtual machine configuration file, use the template file copy, and modify (step 8 copies)

<domain type='kvm'>
  <name>test</name>        //修改名字
  <memory unit='KiB'>2048000</memory>        //修改内存
  <currentMemory unit='KiB'>2048000</currentMemory>
...
      <disk type='file' device='disk'>
          <driver name='qemu' type='qcow2'/>
      <source file='/var/lib/libvirt/images/test.img'/>     //步骤十创建的img文件位置

…
<channel type='unix'> <source mode='bind' path='/var/lib/libvirt/qemu/channel/target/domain-DA-rhel7/org.qemu.guest_agent.0'/> <target type='virtio' name='org.qemu.guest_agent.0'/> <address type='virtio-serial' controller='0' bus='0' port='1'/> </channel>

#以上5行如果有请删除，会导致启动虚拟机出错！！

#注意：除这些外还要把mac地址删掉，带address字样的全部删除（只是网卡需要去掉mac地址和accress地址，pci总线不用去掉）

12. Start the virtual machine verification

[root@room9pc01 images]# virsh define /etc/libvirt/qemu/test.xml
[root@room9pc01 images]# virsh start test
[root@room9pc01 images]# virsh console test