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Home Hacker News

How to Setup QEMU Output to Console and Automate Using Shell Script

Hacker News by Hacker News
April 5, 2025
in Hacker News
Reading Time: 9 mins read
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2025-04-05 18:04:00
fadeevab.com

SSH. Expect. Named pipes. Input/output to the host terminal. Early boot messages.


  • Alexandr Fadeev
How to Setup QEMU Output to Console and Automate Using Shell Script

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While struggling to automate QEMU guest (communicate and control with the shell scripts), I faced a lot of incomplete, partially working solutions around the Internet. Now, I’ve got a pretty decent collection of working recipes to tune up a QEMU guest, so I decided to organize all that stuff here, and it could be definitely useful for anyone else. Each scenario has been tested on the binaries, links on which I put below in the annex: Binaries used in the examples, so you could check it out on your own.

  1. Input/output to the host terminal
  2. Early boot messages in the host terminal
  3. Input/output through a named pipe (file)
  4. Automate QEMU guest using expect tool
  5. Automate QEMU guest using ssh
  6. Binaries used in examples

-serial stdio

qemu-system-x86_64 -serial stdio wheezy.qcow2

qemu-serial-stdio-1

-serial stdio redirects the virtual serial port to the host’s terminal input/output. You will see a welcome string after a successful boot.

-nographic

qemu-system-x86_64 -nographic wheezy.qcow2

qemu-nographic

-nographic does the same as “-serial stdio” and also hides a QEMU’s graphical window.

Cautions:

  1. You will not see any early boot logs in the host’s console. To get them, see Early boot messages in the host terminal below.
  2. To exit the guest system without GUI, using stdio redirected to the terminal, login as a root (user: root, password: root) and shutdown the system (wait after that for a while):
    # Guest
    shutdown -h now
    

console=ttyS0

If you want to see early boot logs, you should pass console=ttyS0 parameter to a Linux kernel command line:

qemu-system-x86_64 -nographic -kernel vmlinuz -hda wheezy.img -append "root=/dev/sda console=ttyS0"

or

qemu-system-x86_64 -serial stdio -kernel vmlinuz -hda wheezy.img -append "root=/dev/sda console=ttyS0"

or

qemu-system-x86_64 -serial stdio wheezy.qcow2
 # 1. Wait for a GRUB menu to show.
 # 2. Press `e`.
 # 3. Find the line starting with "linux".
 # 4. Add "console=ttyS0".

qemu-system-x86_64 -serial stdio -kernel vmlinuz -hda wheezy.img -append “root=/dev/sda console=ttyS0”:
qemu-early-boot-logs-2

  • -serial stdio or -nographic redirects input/output to the current terminal.
  • -append “root=/dev/sda console=ttyS0”: console=ttyS0 forces the guest kernel to send output to the first UART serial port ttyS0, which is redirected to the host by the -serial stdio option, and root=/dev/sda points the kernel to use a /dev/sda device to load the wheezy.img.

Other options:

  • -kernel vmlinuz loads the kernel from the local “./vmlinuz” file.
  • -hda wheezy.img is a raw image which is suitable for booting with vmlinuz binary (wheezy.qcow2 won’t be recognized in the block device).

Create a named pipe

mkfifo /tmp/guest.in /tmp/guest.out

Start QEMU

qemu-system-x86_64 -serial pipe:/tmp/guest -kernel vmlinuz -hda wheezy.img -append "root=/dev/sda console=ttyS0"

-serial pipe:/tmp/guest redirects a guest’s output to a /tmp/guest.out and allows to send input from host to guest via /tmp/guest.in.

Take an output from the guest

cat /tmp/guest.out

Send a command to the guest

When login screen appears, send a login string:

printf "root\n" > /tmp/guest.in

Wait until some string

Wait until SSH Daemon starts.

while read line; do
  echo "${line}"
  if [[ ${line} == *"Secure Shell server: sshd"* ]]; then
    break;
  fi
done 

Install “expect” tool

sudo apt install expect

Create an expect script

example.exp:

#!/usr/bin/expect -f

# Wait enough (forever) until a long-time boot
set timeout -1

# Start the guest VM
spawn qemu-system-x86_64 -serial stdio wheezy.qcow2

expect "login: "
send "root\n"

expect "Password: "
send "root\n"

expect "# "
send "shutdown -h now"

Original script is found there: https://stacoverflow.com/questions/314613/qemu-guest-automation, but be careful, symbol of quotes “ (which is not a “) in the original stackoverflow answer cannot be recognized by the expect utility (send "root\n").

Execute “expect” script

chmod +x example.exp
./example.exp

Set up port forwarding

qemu-system-x86_64 -netdev user,id=net0,hostfwd=tcp::10022-:22 -device e1000,netdev=net0 wheezy.qcow2

Connect via ssh

ssh root@localhost -p 10022 'uptime; ls; echo Test;'

Troubleshooting

  1. QEMU guest has to be able to recognize a network card device (NIC, Network Interface Card): -netdev user,id=net0 -device e1000,netdev=net0.
    # Without port forwarding
    qemu-system-x86_64 -netdev user,id=net0 -device e1000,netdev=net0 wheezy.qcow2
    
  2. Boot and check that the new interface has appeared on the guest system:
    # Guest
    ifconfig -a
    

    Linux kernel on the guest must support a network card emulated by QEMU. In the opposite case the guest won’t get a new Ethernet interface. After booting you should find “eth0” (running broadcast device, not loopback) on the guest. It depends solely on the guest Linux kernel and on the kernel modules.

  3. Check the 10022 port on the host:
    # Host
    netstat -tanp | grep 10022
       tcp  0  0 0.0.0.0:10022   0.0.0.0:*  LISTEN  16589/qemu-system-x
    
  4. Check the 22 port on the guest:
    # Guest
    netstat -tanp | grep 22
        tcp  0  0 0.0.0.0:22      0.0.0.0:*  LISTEN  2430/sshd
    
  5. You can forward telnet port 23 and verify the connection:
    qemu-system-x86_64 -netdev user,id=net0,hostfwd=tcp::10023-:23 -device e1000,netdev=net0 wheezy.qcow2
    
    1. Guest (server):
      # Guest
      nc -v -l -p 23
          Listening on [0.0.0.0] (family 0, port 23)
      
    2. Host (client):
      # Host
      echo asdf | nc localhost 10023
      

Establish passwordless login via ssh

  1. Generate host SSH keys:
    # Host
    ssh-keygen -b 2048 -t rsa -q -N "" -f ./qemukey
    
  2. Set up a public key to the guest as a trusted (authorized) key.
    1. Via ssh-copy-id
    2. Manually
  3. Fix the /etc/ssh/sshd_config on the guest:
    PasswordAuthentication no
    PermitRootLogin without-password
    
  4. Restart SSH daemon on the guest:
    # Guest
    /etc/init.d/ssh restart
    
  5. Connect via ssh:
    # Host
    ssh root@localhost -p 10022 -i ./qemukey
    

    Viola! You don’t need the password and you can automate the remote QEMU guest.


  1. wheezy.qcow2 (i386): bootable Debian “Wheezy” image a QEMU copy-on-write format. Login/password: “root”/”root”, and “user”/”user”.
    wget https://people.debian.org/~aurel32/qemu/i386/debian_wheezy_i386_standard.qcow2 -O wheezy.qcow2
    
  2. wheezy.img (i386): non-bootable Debian “Wheezy” image (without kernel) to use with own kernel (-kernel vmlinuz).
    wget https://storage.googleapis.com/syzkaller/wheezy.img
    
  3. vmlinuz (i386): compressed bootable Linux kernel. Options:
    1. Build from the scratch: Build Android Kernel and Run on QEMU with Minimal Environment: Step by Step.
    2. Download from Ubuntu repository (WARNING! Port forwarding will NOT work):
      wget http://security.ubuntu.com/ubuntu/pool/main/l/linux-signed-azure/linux-image-4.15.0-1036-azure_4.15.0-1036.38~14.04.2_amd64.deb
      ar x linux-image-4.15.0-1036-azure_4.15.0-1036.38~14.04.2_amd64.deb
      tar xf data.tar.xz ./boot/vmlinuz-4.15.0-1036-azure
      cp ./boot/vmlinuz-4.15.0-1036-azure ./vmlinuz
      
    3. You can try your host’s linux kernel passing one to the QEMU guest (WARNING! You could have problems either with port forwarding, or with a block device):
      sudo cp /boot/vmlinuz-$(uname -r) ./
      

    WARNING! Ubuntu’s vmlinuz doesn’t contain drivers for QEMU emulated network card devices (NIC). Debian’s vmlinuz doesn’t have prebuilt drivers to load a raw image from /dev/sda device.

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