Debian 12 Cloud Init Docker Server

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• Create Debian 12 (Bookworm) KVM Guest From Cloud Image

Steps

Below is a working cloud-init example for Debian 12 which will configure the apt source for the Docker repo, so that we can get the latest version of Docker, with the docker-compose plugin. It does a few extra things like install vim and fix a few issues with copy/pasting in vim, and syntax highlighting, and installing additional packages that I like such as htop, sysstat etc.

You will need to swap out the fake SSH public keys with your own, and the final two lines for pulling and running a docker image are fake and just an example in case you wanted to have your docker server pull one of your images and run it on startup.

The giant PGP key for the docker repository is not fake.

#cloud-config

# Debian does not contain gpg by default, so have to do this for the docker key
# https://stackoverflow.com/questions/24418815/how-do-i-install-docker-using-cloud-init
write_files:
  - path: /usr/share/keyrings/docker.asc
    owner: root:root
    permissions: '0644'
    content: |
      -----BEGIN PGP PUBLIC KEY BLOCK-----

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      -----END PGP PUBLIC KEY BLOCK-----


apt:
  sources:
    docker.list:
      source: deb [arch=amd64 signed-by=/usr/share/keyrings/docker.asc] https://download.docker.com/linux/debian $RELEASE stable

package_update: true
package_upgrade: true

packages:
  - docker-ce
  - docker-ce-cli
  - containerd.io
  - docker-buildx-plugin
  - docker-compose-plugin
  - htop
  - nload
  - sysstat
  - pydf
  - ncdu
  - byobu
  - vim


# create the docker group
groups:
  - docker

users:
  - name: admin
    groups: docker
    home: /home/ubuntu
    shell: /bin/bash
    sudo: ALL=(ALL) NOPASSWD:ALL
    ssh-authorized-keys:
      - ssh-rsa AAAAB3NXXXXXXXXXXXXXXXSSSqmNif/5V8= programster@comp1
      - ssh-rsa AAAAB3NXXXXXXXXXXXXXXXzaQrBC+GSOk= programster@comp2

# Add default auto created user to docker group
system_info:
  default_user:
    groups: [docker]

runcmd:
  # fix vim pasting issue
  - /usr/bin/echo "set mouse=" > /home/admin/.vimrc
  - /usr/bin/echo "set mouse=" > /root/.vimrc

  # Fix vim syntax highlighting
  - /usr/bin/sed -i 's;"syntax on;syntax on;' /etc/vim/vimrc

  # Example of pulling and running a docker image.
  - /usr/bin/sleep 10
  - /usr/bin/docker pull programster/some-image-name
  - /usr/bin/docker run -d -p 8000:80 --restart=always programster/some-image-name

Warning - May Need To Expand Qcow2 Disk

When I was working on this, I was following my tutorial on deploying Debian 12 from cloud init. With this we pull a disk image from the internet and we have the option to resize it. If you use the image as-is without expanding it, this cloud-init script will have installed enough packages that the disk will run out of space. Thus you need to make sure that you expand it by at least 1+ GB.