downloads the public key from the "cloud" environment

install-root-key.sh

#!/bin/sh
#
# install-root-key.sh
#
# This script downloads the public key from the "cloud" environment.

if [ ! -d /root/.ssh ]; then
  mkdir -p /root/.ssh
	chmod 700 /root/.ssh
fi

# fetch public key
if [ ! -s /root/.ssh/authorized_keys ]; then
	echo "Downloading public key from instance metadata"
	wget \
		--timeout=12 \
		--tries=50 \
		--waitretry=1 \
		--retry-connrefused \
		-O /root/.ssh/authorized_keys \
		http://169.254.169.254/latest/meta-data/public-keys/0/openssh-key

	if [ $? -eq 0 ]; then
		chmod 0600 /root/.ssh/authorized_keys
		echo "Successfully downloaded!"
		break
	fi
fi