ansible-raspberry-admin

[Note]

• xxxx

[Pre requisite]

• Raspberry Pi(s) with Raspbian

• Internet connectivity and IP address of the Raspberry Pi (get by scanner something like this : 1.sudo nmap -sn 192.168.1.0/24)

• Ansible (How to)

0 - Prepare Raspberry pi HostName

DO some stuff

1 - Install Ansible on Master pi

sudo apt-get install python-pip git python-dev sshpass
sudo pip install markupsafe
sudo pip install ansible

A - Share SSH key between remote hosts

First step : Set up a public/private keypair on the Raspberry pi controller so I don’t have to do any login stuff

// Generate the key
ssh-keygen -t rsa -b 4096 -f ~/.ssh/id_rsa
// show it
cat ~/.ssh/id_rsa.pub

Second step : Copy the key freshly output and use SSH to connect to each Pi from the raspberry pi Master

ssh-copy-id pi@P1
ssh-copy-id pi@P2
ssh-copy-id pi@P3
ssh-copy-id pi@P4

Not very efficient ...

The best solution

Create a file called 'servers'. One server by line.

192.168.100.1
server.example.com
192.168.100.2
server2.example.com

Create a script file

#!/bin/bash

for i in `cat servers`;
do
   ssh-copy-id -i ~/.ssh/id_rsa.pub pi@$i
done

B - Project structure

./bootstrap.yml
./hosts
./keys/
./roles/

Description

• bootstrap.yml is an Ansible playbook that contains instructions about which roles are run on which hosts, and with which variables.

• hosts has a list of hosts where the configurations are run into.

• keys is a directory for SSH keys for passwordless access to the Raspberries.

1 - Configuring hosts

Create the hosts file and copy paste the data below

[clusternodes]
raspberrypi[1:4]
[clusternodes:vars]
ansible_ssh_user=pi

2 - Configuring ssh access

3 - Running script

ansible-playbook -i hosts bootstrap.yml --ask-pass

On the first run to a fresh Raspbian you will ask to enter a new password

$ ansible-playbook -i hosts bootstrap.yml --ask-pass
SSH password:
Enter new password for user pi:

PLAY [all] *********************************************************************
...

4 - Test the devices modifications

Sources:

https://garthvh.com/blog/2017/02/11/Raspberry-Pi-Zero-Cluster-with-Ansible/
http://www.hietala.org/automating-raspberry-pi-setup-with-ansible.html