Prepare the environment

1. Turn on the virtualization Intel VT-x/EPT or AMD-V/RVI(V) option in the processor

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2. Start the virtual machine and check whether the machine supports KVM

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3. Turn off the firewall

[root@localhost ~]# systemctl stop firewalld
[root@localhost ~]# setenforce 0
[root@localhost ~]#

4. Install and start kvm

[root@localhost ~]# yum install -y qemu-kvm libvirt virt-install bridge-utils
[root@localhost ~]# systemctl start libvirtd
[root@localhost ~]# systemctl enable libvirtd

5. Create view storage file

[root@localhost ~]# qemu-img create -f raw /opt/CentOS-7-x86_64.raw 10G
Formatting '/opt/CentOS-7-x86_64.raw', fmt=raw size=10737418240 
[root@localhost ~]# ls -l /opt/CentOS-7-x86_64.raw 
-rw-r--r--. 1 root root 10737418240 10月 30 13:59 /opt/CentOS-7-x86_64.raw

6. Upload image

[root@localhost ~]# mv CentOS-7-x86_64-Minimal-2003.iso /tmp/
[root@localhost ~]# ls /tmp/
CentOS-7-x86_64-Minimal-2003.iso

7. Create a physical bridge bridge interface br0

[root@localhost ~]# virsh iface-bridge ens33 br0
[root@localhost ~]# systemctl restart network

Use your physical network card ens33 as the switch, use br0 as the network card, provide IP, and restart the network service

Note: The command may freeze or make an error, and the terminal will be forced to exit; wait a while, restart the network card, and it will be OK after logging in

8. Install the virtual machine

virt-install --virt-type kvm --name CentOS-7-x86_64 --ram 1536 --cdrom=/tmp/CentOS-7-x86_64-Minimal-2003.iso --disk path=/opt/CentOS-7-x86_64.raw  --network bridge=br0 --graphics vnc,listen=0.0.0.0 --noautoconsole