cloud-init config:
#cloud-config
hostname: vpn-pritunl-clientvpn-01
fqdn: vpn-pritunl-clientvpn-01.inf.us-west-2.aws.acme.com

mounts:
- [ephemeral0, null]

runcmd:
- /usr/local/sbin/set-hostname vpn-pritunl-clientvpn-01.inf.us-west-2.aws.acme.com vpn-pritunl-clientvpn-01
- /usr/local/sbin/enable-salt-minion


set-hostname:
#!/bin/bash

HOSTNAME=$1
SHORTNAME=$2

INTERNAL_IPADDRESS=`ip addr show eth0 | grep 'inet ' | awk '{ print $2 }' | cut -f1 -d/`

echo >> /etc/hosts
echo "$INTERNAL_IPADDRESS $HOSTNAME $SHORTNAME" >> /etc/hosts
echo "$HOSTNAME" > /etc/hostname
hostname $HOSTNAME