back Creating a Debian Vagrant box for libvirt

publication: Junho 12 2023 19:53
last update: Junho 12 2023 19:53


Create disk image:

$ qemu-img create -f qcow2 debian12.qcow2 128G

Proceed with your prefered install options using QEMU. I created a regular user called vagrant during the install.

post install config

On the guest machine, add user vagrant to sudoers:

$ sudo sh -c 'echo "vagrant ALL=(ALL) NOPASSWD: ALL" > /etc/sudoers.d/vagrant'
$ chmod 440 /etc/sudoers.d/vagrant

Change the network interface name to legacy style by adding net.ifnames=0 to /etc/default/grub in GRUB_CMDLINE_LINUX variable. Update grub:

$ sudo update-grub2

Edit network settings in /etc/network/interfaces

allow-hotplug eth0
iface eth0 inet dhcp

Lock user vagrant password. We will login using ssh keys

$ sudo passwd -l vagrant

Clean history and shutdown the guest:

$ history -c

On the host machine, download Vagrant ssh key:

$ curl -L -O vagrant-ssh-key

The file content is:

ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA6NF8iallvQVp22WDkTkyrtvp9eWW6A8YVr+kz4TjGYe7gHzIw+niNltGEFHzD8+v1I2YJ6oXevct1YeS0o9HZyN1Q9qgCgzUFtdOKLv6IedplqoPkcmF0aYet2PkEDo3MlTBckFXPITAMzF8dJSIFo9D8HfdOV0IAdx4O7PtixWKn5y2hMNG0zQPyUecp4pzC6kivAIhyfHilFR61RGL+GPXQ2MWZWFYbAGjyiYJnAmCP3NOTd0jMZEnDkbUvxhMmBYSdETk1rRgm+R4LOzFUGaHqHDLKLX+FIPKcF96hrucXzcWyLbIbEgE98OHlnVYCzRdK8jlqm8tehUc9c9WhQ== vagrant insecure public key

This is an insecure public key which will be used by Vagrant on the first access and replaced later.

Reset ssh guest server keys and inject vagrant public key:

$ sudo virt-sysprep -d debian12 --ssh-inject vagrant:file:vagrant-ssh-key --firstboot-command "dpkg-reconfigure openssh-server"

creating the box

I used the from the vagrant-libvirt repository.

Create the Vagrantfile with at least these two lines and any other config you wish:

Vagrant.configure("2") do |config|
    config.vm.synced_folder ".", "/vagrant", disabled: true

Creating the box:

$ debian12.qcow2 Vagrantfile
==> Creating box, tarring and gzipping
Total de bytes escritos: 2800097280 (2,7GiB, 31MiB/s)
==> created
==> You can now add the box:
==>   'vagrant box add --name debian12'

Adding the box to Vagrant:

$ vagrant box add --name debian12

running the new machine

$ vagrant init debian12
$ vagrant up bug in IMG_SIZE:

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