cloud-init support

[jay7x]

It'd be great to have cloud-init experimental feature supported in the QEMU provider. Though it means disks feature is required too (as cloud-init works this way for non-cloud VMs).

This way it's possible to use e.g. Ubuntu and Debian cloud images unmodified.

Links:

• https://developer.hashicorp.com/vagrant/docs/cloud-init
• https://developer.hashicorp.com/vagrant/docs/disks
• https://cloudinit.readthedocs.io/en/latest/topics/datasources/nocloud.html

[ppggff]

Thanks, I will take a closer look at it.

[jay7x]

You can use VirtualBox builtin provider as a reference I guess.. my Ruby foo is not that great so it's hard to say where to look exactly.. feel free to ask for testing and for cloud-init-related help.

Roughly it's enough to add the following to QEMU call:

-drive file=/path/to/cidata.iso,media=cdrom

The ISO MUST have cidata label and MUST contain 2 files:

• /meta-data
• /user-data

Then cloud-init will consider this CD as a data source to apply the configuration from.

[jay7x]

Few more on how to get that working if/when support will be implemented:

1. wget -O debian-11-genericcloud-arm64.qcow2 https://cloud.debian.org/images/cloud/bullseye/20221108-1193/debian-11-genericcloud-arm64-20221108-1193.qcow2

2. Use the `Vagrantfile`:

   # Basic Vagrant config (API version 2)
   Vagrant.configure(2) do |config|
     vagrant_root = File.dirname(__FILE__)
     config.vm.provider "qemu" do |qemu|
       qemu.qemu_dir = "/opt/homebrew/share/qemu"
       qemu.image_path = "#{vagrant_root}/debian-11-genericcloud-arm64.qcow2"
     end
   
     config.vm.cloud_init :user_data do |cloud_init|
       cloud_init.content_type = "text/cloud-config"
       cloud_init.inline = <<-EOF
         disable_root: true
         growpart:
           mode: "auto"
           devices: ["/"]
         ssh_pwauth = true
         users:
           - name: vagrant
             plain_text_passwd: vagrant
             lock_passwd: false
             shell: /bin/bash
             sudo: "ALL=(ALL) NOPASSWD:ALL"
             ssh_authorized_keys:
               - ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA6NF8iallvQVp22WDkTkyrtvp9eWW6A8YVr+kz4TjGYe7gHzIw+niNltGEFHzD8+v1I2YJ6oXevct1YeS0o9HZyN1Q9qgCgzUFtdOKLv6IedplqoPkcmF0aYet2PkEDo3MlTBckFXPITAMzF8dJSIFo9D8HfdOV0IAdx4O7PtixWKn5y2hMNG0zQPyUecp4pzC6kivAIhyfHilFR61RGL+GPXQ2MWZWFYbAGjyiYJnAmCP3NOTd0jMZEnDkbUvxhMmBYSdETk1rRgm+R4LOzFUGaHqHDLKLX+FIPKcF96hrucXzcWyLbIbEgE98OHlnVYCzRdK8jlqm8tehUc9c9WhQ== vagrant insecure public key
       EOF
     end
   end

3. vagrant up

Vagrant should be able to spin the VM up and to ssh into as vagrant user with the vagrant insecure key.

Usually cloud-init output is visible on the VM console (serial console in this case). E.g. below is the output from my packer when everything is good. You can see the DataSourceNoCloud [seed=/dev/vdb] is recognized here (this is an CDROM image made by packer).

[    4.365327] cloud-init[587]: Cloud-init v. 20.4.1 finished at Tue, 06 Dec 2022 04:38:18 +0000. Datasource DataSourceNoCloud [seed=/dev/vdb][dsmode=net].  Up 4.36 seconds

If anything is wrong with the CD image you'll see some datasource-related error at early cloud-init stage.

Feel free to contact me if need any help!