Configure a Raspberry Pi cluster using cloud-init and then install few packages

config.txt

hdmi_safe=1
enable_uart=0
gpu_mem=16

install-packages.sh

sudo apt update
sudo apt upgrade -y

sudo apt install -y vim-tiny tmux glances oracle-java8-jdk nginx

sudo apt install -y erlang erlang-dev elixir 
sudo apt install -y snapd flatpak

sudo apt install -y python3 python3-pip python3-dev
pip3 install django flask

sudo apt install -y unzip zip gnupg2 dirmngr 

curl -s "https://get.sdkman.io" | bash
. ~/.sdkman/bin/sdkman-init.sh
sdk install groovy
sdk install kotlin
sdk install kscript
sdk install micronaut
sdk install scala
sdk install vertx

sudo apt install -y python-zmq

curl -sL https://deb.nodesource.com/setup_8.x | sudo -E bash -
sudo apt install -y nodejs

sudo apt install -y git curl zlib1g-dev subversion
sudo apt install -y openssl libreadline6-dev git-core zlib1g libssl-dev
sudo apt install -y libyaml-dev libsqlite3-dev sqlite3
sudo apt install -y libxml2-dev libxslt-dev
sudo apt install -y autoconf automake libtool bison
gpg --keyserver hkp://keys.gnupg.net \
  --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 \
  7D2BAF1CF37B13E2069D6956105BD0E739499BDB
curl -sSL https://get.rvm.io | bash -s stable --ruby=ruby --gems=rails

echo "gem: --no-document" > ~/.gemrc

master10.yaml

#cloud-config
# vim: syntax=yaml
#
hostname: master10
manage_etc_hosts: true
apt_preserve_sources_list: true

users:
  - name: life
    sudo: ALL=(ALL) NOPASSWD:ALL
    shell: /bin/bash
    groups: users,docker
    plain_text_passwd: asdf
    lock_passwd: false
    ssh_pwauth: true
    chpasswd: { expire: false }

package_upgrade: false

write_files:
  - content: |
      iface eth0 inet static
      address 192.168.2.10
      netmask 255.255.255.0
      network 192.168.2.0
      broadcast 192.168.2.255
    path: /etc/network/interfaces.d/eth0 
  - content: |
      allow-hotplug wlan0
      iface wlan0 inet dhcp
      wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf
      iface default inet dhcp 
    path: /etc/network/interfaces.d/wlan0 
  - content: |
      ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
      update_config=1
      network={
      ssid=""  # enter the SSID of your network in quotes
      psk=""   # enter the password for the network in quotes
      proto=RSN
      key_mgmt=WPA-PSK
      pairwise=CCMP
      auth_alg=OPEN
      }
    path: /etc/wpa_supplicant/wpa_supplicant.conf
  - content: |
      #!/bin/sh -e
      exec 2> /tmp/rc.local.log
      exec 1>&2
      set -x
      systemctl restart avahi-daemon
      timedatectl set-timezone America/Chicago
      ifup eth0
      ip link set wlan0 down
      exit 0
    path: /etc/rc.local
    permissions: '0755'

runcmd:
  - '/etc/rc.local'

update-packages.sh

sudo ip link set wlan0 up

sleep 10

sudo apt update
sudo apt -y upgrade 

pip3 install -U django flask 

. ~/.sdkman/bin/sdkman-init.sh
sdk update
sdk ug
sdk flush temp
sdk flush archives
sdk uninstall groovy 2.5.0
sdk uninstall vertx 3.5.2

rvm get stable --auto-dotfiles
rvm remove ruby 2.4.1
rvm install ruby --latest
rvm install jruby 9.2.0.0
rvm reload
rvm use ruby
gem install rails

sudo ip link set wlan0 down