an example of an unattended dokku install script

unattended-dokku-install-example

#!/bin/bash

# <UDF name="ssh_key" default="" label="Public SSH Key for user" />
# <UDF name="username" default="" label="default username" />
# <UDF name="hostname" default="" label="default username" />

function logit {
  # Simple logging function that prepends an easy-to-find marker '=> ' and a timestamp to a message
  TIMESTAMP=$(date -u +'%m/%d %H:%M:%S')
  MSG="=> ${TIMESTAMP} $1"
  echo ${MSG}
}

exec &> /root/setup-linodku.log
function add_user {
    logit "starting creation of user '${USERNAME}'"
	HOME=/home/"${USERNAME}"
	logit "adding user ${USERNAME}..."
	# the value after -p is encrypted password
	useradd $USERNAME -m -s /bin/bash -p PNDaLfjXH1fOc
	logit "making user superuser..."
	usermod -a -G sudo $USERNAME
	logit "creating .ssh directory..."
	mkdir $HOME/.ssh
	chown $USERNAME $HOME/.ssh
	logit "adding public key to authorized_keys..."
	echo "${SSH_KEY}" >> $HOME/.ssh/authorized_keys
	echo "${SSH_KEY}" >> $HOME/.ssh/id_rsa.pub
}


function set_passwordless_ssh {
  logit "making login with password impossible..."
  # warning: there is also a /etc/ssh/ssh_config file, ignore it
  passwordfile=/etc/ssh/sshd_config
  # logit "Turn off password authentication and root login for SSH"
  sed -i 's/PasswordAuthentication yes/PasswordAuthentication no/' "$passwordfile"
  service ssh restart
}


function set_hostname {
  logit "setting hostname to ${HOSTNAME}..."
  if [ -n "${HOSTNAME}" ]; then
    echo $HOSTNAME > /etc/hostname
    echo $IPADDR $FQDN $HOSTNAME >> /etc/hosts
  else
    system_primary_ip > /etc/hostname
    echo "$(system_primary_ip) localhost" >> /etc/hosts
  fi

  IPADDR=$(/sbin/ifconfig eth0 | awk '/inet / { print $2 }' | sed 's/addr://')
  hostname -F /etc/hostname
}

function install_prerequisites {
  sudo apt-get install -qq -y curl > /dev/null 2>&1

  logit "installing docker gpg key..."
  curl -sSL https://get.docker.com/gpg 2> /dev/null | apt-key add - > /dev/null 2>&1

  logit "installing dokku gpg key..."
  curl -sSL https://packagecloud.io/gpg.key 2> /dev/null | apt-key add - > /dev/null 2>&1

  logit "running apt-get update..."
  sudo apt-get update > /dev/null

  logit "installing pre-requisites..."
  sudo apt-get install -qq -y apt-transport-https > /dev/null 2>&1

  logit "setting up apt repositories..."
  echo "deb https://get.docker.io/ubuntu docker main" > /etc/apt/sources.list.d/docker.list
  echo "deb https://packagecloud.io/dokku/dokku/ubuntu/ trusty main" > /etc/apt/sources.list.d/dokku.list

  logit "running apt-get update..."
  sudo apt-get update > /dev/null
  
}

function install_postgres {
  logit "installing Postgres..."
  sudo apt-get install -qq -y postgresql postgresql-contrib > /dev/null 2>&1
  logit "starting Postgres..."
  sudo service postgresql start
}

function install_dokku {
    logit "setting up debconf..."
	HOME=/home/"${USERNAME}"
    echo "dokku dokku/vhost_enable boolean true" | sudo debconf-set-selections
    echo "dokku dokku/web_config boolean false" | sudo debconf-set-selections
    echo "dokku dokku/hostname string ${HOSTNAME}" | sudo debconf-set-selections
    echo "dokku dokku/key_file string $HOME/.ssh/id_rsa.pub" | sudo debconf-set-selections

    logit "installing Docker..."
    # install docker
    wget -nv -O - https://get.docker.com/ | sh

    # install dokku
    logit "installing Dokku..."
    sudo apt-get update -qq > /dev/null
    sudo apt-get install -qq -y dokku
    sudo dokku plugin:install-dependencies --core

	# start creation of backing services
	# on your dokku host
	# install the postgres plugin
	# plugin installation requires root, hence the user change
    logit "installing Postgres plugin for Dokku..."
	sudo dokku plugin:install https://github.com/dokku/dokku-postgres.git

	logit "Dokku installed."
}

add_user
set_passwordless_ssh
set_hostname
install_prerequisites
install_postgres
install_dokku