install qemu with linux

purpose

• start QEMU virtual machine with KVM(Kernel-based Virtual Machine) accelerator

pre-requirements

• linux operating system with x86_64 chip(take Ubuntu 20.04.2 LTS as an example)
• cpu support virtualization(to use KVM accelerator)

do it

create centos 8 with qemu

1. install qemu
   • install with linux
   • install with mac
2. in practise(take Ubuntu 20.04.2 LTS as an example)
   • download

     • curl -LO https://resource.geekcity.tech/qemu/centos.8.qcow2
       

   • start with qemu

     • qemu-system-x86_64 \
           -accel kvm \
           -cpu kvm64 -smp cpus=1 \
           -m 1G \
           -drive file=$(pwd)/centos.8.qcow2,if=virtio,index=0,media=disk,format=qcow2 \
           -rtc base=localtime \
           -pidfile $(pwd)/centos.8.qcow2.pid \
           -display none \
           -nic user,hostfwd=tcp::1022-:22 \
           -daemonize
       

     • note: choose your own accelerator, in this example we use -accel kvm
   • login with ssh

     • ssh -o "UserKnownHostsFile /dev/null" -p 1022 root@localhost
       

     • default password is 123456