====== QEMU ======

resize qcow2 size:

  qemu-img resize /path/to/qcow2 20G
  qemu-img resize /path/to/qcow2 +20G

grow guest partition size:

  growpart /dev/vda X
  # grow ext4
  resize2fs /dev/vdaX
  # grow btrfs
  btrfs filesystem resize max /

====== Hyper-V ======

convert qcow2 image to vhdx:

  qemu-img convert -p -f qcow2 -O vhdx /path/to/qcow2 /path/to/vhdx

====== WSL ======

general commands:

  wsl --mount --vhd <VHD> --bare
  wsl --unmount <VHD>
  growpart /dev/sda 1
  Resize-VHD –Path <VHD> –SizeBytes 30GB
  
shrink VHD:

  optimize-vhd -Path .\ext4.vhdx -Mode full

to fix DISPLAY on Arch, create following systemd service:

<code>
https://superuser.com/questions/1617298/wsl-2-running-ubuntu-x-server-cant-open-display/1834709#1834709
cat > /etc/systemd/system/wslg.service <<EOF
[Unit]
Description=symlink /tmp/.X11-unix
After=systemd-tmpfiles-setup.service

[Service]
Type=oneshot
ExecStart=rmdir /tmp/.X11-unix
ExecStart=ln -s /mnt/wslg/.X11-unix /tmp/

[Install]
WantedBy=sysinit.target
EOF
</code>

enable this service:

  systemctl enable wslg
====== Configs ======

systemd-networkd:

<code>
[Match]
Name=eth*

[Network]
DHCP=yes
</code>