安装qemu
apt-get install qemu qemu-kvm qemu-system-gui -y
创建qcow2格式的虚拟磁盘(默认raw格式)
qemu-img create -f qcow2 ubuntu20.qcow2 20G
查看虚拟磁盘信息
qemu-img info centos2.raw
qemu启动
# 默认启动图形界面（从iso安装系统）
qemu-system-x86_64 -m 4096 -smp 4 --enable-kvm -boot d -hda ubuntu20.qcow2 -cdrom ubuntu-20.04-live-server-amd64.iso
-m 4096 # 虚拟机内存4096MB -smp 4 # 虚拟机4个vcpu -hda # 硬盘文件 -cdrom # 光盘文件 -boot # 启动顺序，从光盘启动 -vnc :1 # VNC --nographic # 不使用图形界面,console -serial telent:localhost:4321,server,nowait # 图形+localhost 4321
ssh – NAT
创建网桥virbr0
sudo brctl added virbr0
sudo ifconfig virbr0 192.168.122.1 net mask 255.255.255.0 up
创建tap接口tap0，并添加到网桥
sudo tunctl -t tap0
sudo ifconfig tap0 0.0.0.0 up
sudo brctl addif virbr0 tap0
虚拟机使用tap0作为网络设备启动
qemu-system-x86_64 -m 4096 -smp 4 --enable-kvm -boot d -hda /opt/ubuntu20.qcow2 -cdrom /home/kylin/ubuntu-20.04-live-server-amd64.iso \
-netdev tap,id=tapnet,ifname=tap0,script=no \
-device rtl8139,netdev=tapnet
-netdev 指定网络方式 -device 指定硬件，网卡使用netdev
ssh – Bridge
只有在创建网桥的时候和 ssh – NAT 有差别，其余的步骤方法是都一样的
refe
https://man.archlinux.org/man/qemu.1
https://wiki.archlinux.org/index.php/QEMU_(简体中文)
https://blog.csdn.net/RichardYSteven/article/details/54807927?utm_medium=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-2.control&dist_request_id=1328602.9293.16149062389857733&depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-2.control
https://blog.csdn.net/RichardYSteven/article/details/54645328?utm_medium=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-1.control&dist_request_id=&depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-1.control