vultr-ubuntu18-docker-startup

firstboot.sh

#!/bin/bash

log () {
  level=$1
  log=$2
  t=`date +%F/%T`
  echo "[${t} ${level}] ${log}"
}

METADATA=http://169.254.169.254/v1

IP6Prefix="fda1:0000:0000:0da1"
LANIPPARENT="fda1::/48"
LANIP6GATEWAY="fda1::da1:a:a:a:a"
LANNAME="dfw-core"

WANIP=""
WANIP6=""
LANIP=""
LANIP6=""
LANMAC=""

getRandomIP6 () {
  array=( 1 2 3 4 5 6 7 8 9 0 a b c d e f )
  addr=$IP6Prefix
  x=0
  while [ $x -lt 4 ]; do
    addr=${addr}:${array[$RANDOM%16]}${array[$RANDOM%16]}${array[$RANDOM%16]}${array[$RANDOM%16]}
    x=$(($x+1))
  done
  echo "$addr"
}

getLanConfig () {
  interfaces=$(curl -s ${METADATA}/interfaces/); ec=$?
  if [[ $ec != 0 ]]; then log error "Unable to reach interfaces via metadata (${METADATA})" ; fi
  log "info" "Loading interfaces..."
  for interface in $interfaces;
  do
    ntype="$(curl -s ${METADATA}/interfaces/${interface}network-type)"
    case "$ntype" in
      "public")
      WANIP="$(curl -s ${METADATA}/interfaces/${interface}ipv4/address)"
      WANIP6="$(curl -s ${METADATA}/interfaces/${interface}ipv6/address)"
      log "info" "Identified WAN ${WANIP} ${WANIP6}"
      ;;
      "private")
      LANMAC="$(curl -s ${METADATA}/interfaces/${interface}mac)"
      LANIP="$(curl -s ${METADATA}/interfaces/${interface}ipv4/address)"
      LANIP6="$(curl -s ${METADATA}/interfaces/${interface}ipv6/address)"
      if [ -z "$LANIP6" ]; then
        # generate new random ip
        LANIP6="$(getRandomIP6)"
      fi
      log "info" "Identified LAN ${LANMAC} ${LANIP} ${LANIP6}"
      ;;
      "*")
      log "error" "Type not found (${type})"
      exit 1 #TODO this doesn't exit "now" also tried return oh well I guess
      ;;
    esac
  done
}

writeLanConfig () {
  if [ ! -f /etc/netplan/10-${LANNAME}.yaml ]; then
    cat <<- EOF > /etc/netplan/10-${LANNAME}.yaml
network:
  version: 2
  renderer: networkd
  ethernets:
    ens7:
      match:
        macaddress: "$LANMAC"
      mtu: 1450
      dhcp4: no
      dhcp6: no
      addresses: ["${LANIP}/24", "${LANIP6}/64"]
      routes:
        - to: "${LANIPPARENT}"
          via: "${LANIP6GATEWAY}"
EOF
  log "info" "LAN Configuration installed, applying network changes..."
  netplan --debug apply
  fi
}

createConsulIface () {
  # Wow, this had to use systemd. https://askubuntu.com/a/1037551
  if [ ! -f /etc/systemd/network/consul0.netdev ]; then
    cat <<- EOF > /etc/systemd/network/consul0.netdev
[NetDev]
Name=consul0
Kind=dummy
EOF
    cat <<- EOF > /etc/systemd/network/consul0.network
[Match]
Name=consul0

[Network]
Address=169.254.1.1/32
EOF
    log "info" "Wrote files /etc/systemd/network/consul0.netdev and consul0.network. Reloading systemd-networkd."
    systemctl restart systemd-networkd
    systemctl status systemd-networkd
  fi
}

log "info" "Starting..."
getLanConfig
log "info" "Getting LAN config..."
writeLanConfig
log "info" "LAN config written to /etc/netplan/10-${LANNAME}.yaml"
log "info" "Creating consul dummy interface (consul0)"
createConsulIface
log "info" "Done"