which kvm
man kvm
mkdir -p /etc/qemu/
vi /etc/qemu/bridge.conf
allow guestbr0
vdisk=/root/guest1.ext4
vdisk=/root/guest2.ext4
vdisk=/root/guest3.ext4
dd if=/dev/zero of=$vdisk bs=1G count=0 seek=10
mkfs.ext4 $vdisk
mkdir lala/
mount -o loop $vdisk lala/
# use same mirror as from host system
cat /etc/apt/sources.list
mirror=`cat /etc/apt/sources.list | awk '{print $2}'`
apt install lsb-release debootstrap
# use same release as host system
lsb_release -cs
time debootstrap --arch=amd64 `lsb_release -cs 2>/dev/null` lala/ $mirror
cat > lala/etc/fstab <<-EOF # override
/dev/vda1 / ext4 defaults 0 0
proc /proc proc defaults 0 0
tmpfs /tmp tmpfs rw,nodev,nosuid,noatime,relatime 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
EOF
kvm -nic model=help
# host kernel is not suitable for serial output?
ls -lhF /boot/config*
grep CONFIG_VIRTIO_CONSOLE /boot/config-6.1.0-32-cloud-amd64
grep -i virtio /boot/config-6.1.0-32-cloud-amd64
screen -S consoles
vdisk=/root/guest1.ext4
vdisk=/root/guest2.ext4
vdisk=/root/guest3.ext4
bridge=guestbr0
# guest1
mac=0a:01:01:01:01:01
# guest2
mac=0e:02:02:02:02:02
# guest3
mac=02:03:03:03:03:03
# we are lucking we're doing a poc using nested virtualization here...
ls -lhF /boot/vmlinuz*
ls -lhF /boot/initrd*
kernel=/boot/vmlinuz-6.1.0-32-cloud-amd64
initrd=/boot/initrd.img-6.1.0-32-cloud-amd64
# beware the path here needs to be /dev/vda not /dev/vda1
kvm --enable-kvm -m 256 \
-display curses -serial pty \
-drive file=$vdisk,media=disk,if=virtio,format=raw \
-kernel $kernel -initrd $initrd -append "ro root=/dev/vda net.ifnames=0 biosdevname=0 mitigations=off init=/bin/bash" \
-nic bridge,br=guestbr0,model=virtio-net-pci,mac=$mac
# -overcommit mem-lock=off \
# -display none -nographic -serial pty \
# -device virtio-serial-pci,id=serial0 \