安裝qemu
apt-get install qemu qemu-kvm qemu-system-gui -y
創建qcow2格式的虛擬磁盤(默認raw格式)
qemu-img create -f qcow2 ubuntu20.qcow2 20G
查看虛擬磁盤信息
qemu-img info centos2.raw
qemu啟動
# 默認啟動圖形界面（從iso安裝系統）
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 # 虛擬機內存4096MB -smp 4 # 虛擬機4個vcpu -hda # 硬盤文件 -cdrom # 光盤文件 -boot # 啟動順序，從光盤啟動 -vnc :1 # VNC --nographic # 不使用圖形界面,console -serial telent:localhost:4321,server,nowait # 圖形+localhost 4321
ssh – NAT
創建網橋virbr0
sudo brctl added virbr0
sudo ifconfig virbr0 192.168.122.1 net mask 255.255.255.0 up
創建tap接口tap0，並添加到網橋
sudo tunctl -t tap0
sudo ifconfig tap0 0.0.0.0 up
sudo brctl addif virbr0 tap0
虛擬機使用tap0作為網絡設備啟動
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 指定網絡方式 -device 指定硬件，網卡使用netdev
ssh – Bridge
只有在創建網橋的時候和 ssh – NAT 有差別，其余的步驟方法是都一樣的
refe
https://man.archlinux.org/man/qemu.1
https://wiki.archlinux.org/index.php/QEMU_(簡體中文)
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