A really simple script that I use to bootstrap devstack on a brand new Rackspace cloud server.

gistfile1.sh

#!/bin/bash

host=$1
pub_key=$2

function help {
    echo 'usage: ./bootstrap-devstack.sh host public_key'
    echo '       example: ./bootstrap-devstack.sh 1.1.1.1 ~/.ssh/id_dsa.pub'
    exit 1
}

# XXX: add some validation here

REPO='https://github.com/openstack-dev/devstack.git'
GIST='https://gist.github.com/everett-toews/4004430/raw/57481ac76bebd41ad4d825fda365f752027026eb/localrc'

echo "
function install_software {
    apt-get update
    apt-get upgrade -y
    apt-get install -y git libxslt1.1 libxslt1-dev
}

function create_user_account {
    adduser --disabled-password --gecos $USER $USER
    echo '$USER ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers
}

function disable_password_login {
    perl -p -i -e 's/UsePAM yes/UsePAM no/' /etc/ssh/sshd_config
    echo 'PasswordAuthentication no' >> /etc/ssh/sshd_config
    service ssh reload
}

function setup_pubkey {
    su - $USER -c 'mkdir -m 0700 /home/$USER/.ssh && \
            echo \"`cat $pub_key`\" >> /home/$USER/.ssh/authorized_keys && \
            chmod 0644 /home/$USER/.ssh/authorized_keys'
}

function install_devstack {
    su - $USER -c 'git clone $REPO -b stable/folsom devstack && \
            cd devstack && \
            curl $GIST > localrc && \
            ./stack.sh'
}

install_software
create_user_account
setup_pubkey
#disable_password_login
install_devstack
" | ssh \
        -o 'StrictHostKeyChecking no' \
        -o "UserKnownHostsFile /dev/null" \
        root@${host}