This project offers a free and Ansible managed alternative to proprietary info screens. The only component needed is a Raspberry Pi. The project should work with all Raspberry Pi's but is currently only tested on model 3.

It is recommended to run the rpi's on a seperated network or VLAN as rpi's left unsupervised are prone to external keyboard attacks.

Blog post on Semaphor's website

To get started, clone this repository and generate an ssh keypair without password:

git clone https://github.com/semaphor-dk/infopi
ssh-keygen

After obtaining the repository, some configurations must be made in order to suit your infrastructure.

• Update hosts with the internal ip's or domains that point to the infopi's
• Point to the private ssh key in ansible.cfg
• Update url's to be cycled thorough through in the group_vars/infopi.yml
• Set amount of seconds between each tab switch in roles/infopi/defaults/main.yml

Download and flash Raspberry Pi OS Lite to a micro SD card. This can be done with Etcher

When the card is flashed, boot the rpi and update/upgrade the OS. This can be done directly on the RPi or through ssh.

sudo apt update -y && sudo apt upgrade -y

With the built in raspi-config menu, enable auto login, ssh-server, and change the default password.

sudo raspi-config

The settings can be found under:

• 1 System Options
  • S3 Password
  • S5 Boot / Auto login
    • B2 Console Autologin
• 3 Interface Option
  • P2 SSH

If changing the resolution is necessary or a black border is present, it can be configured under 2 Display

• 2 Display
  • D1 Resolution
  • D2 Underscan

Next, set a static ip, the gateway and DNS if it's required in /etc/dhcpcd.conf

interface eth0
static ip_address=192.168.1.2/24
static routers=192.168.1.1
static domain_name_servers=192.168.1.3

Put the public ssh key generated under the preparation in ~/.ssh/authorized_keys

Disable password authentication and enable public key authentication by uncommenting the following in /etc/ssh/sshd_config

PubkeyAuthentication yes
PasswordAuthentication no

Allow the default user pi to run commands with sudo without prompting for password.

echo "%pi ALL=(ALL) NOPASSWD: ALL" | sudo tee -a /etc/sudoers

Make sure all unpacked packages are configured in dpkg with:

sudo dpkg --configure -a

Make sure you have ansible installed:

sudo apt install ansible -y

The initialization, configuration and updates of the infopi's can be done with:

ansible-playbook infopi.yml

• Harden RPi's

  • disable usb ports

• Automate with Ansible

  • autoscaling og black margin conf
  • autologin, password change og ssh-server enable
  • configure dpkg
  • generate and insert ssh keys
  • enable public key auth and disable password auth
  • enable pi user to run sudo commands without password prompt
  • set ip, dns and gateway