create_dit4c_compute_nodes

#!/bin/bash

set -e

# Trim whitespace off a string
trim() {
  tr -d '[[:space:]]'
}

# Utility function for parsing OpenStack CLI tool table output to get a value.
# $1 -> key to lookup
# eg. value_from_table 'id'
value_from_table() {
  grep ' '$1 | cut -d '|' -f 3 | trim
}

PREFIX=$1
CLOUD_CONFIG=$2
NUM=${3:-1}
COMPUTE_FLAVOR=${COMPUTE_FLAVOR:-m2.small}
SECURITY_GROUP=${SECURITY_GROUP:-dit4c-compute}
IMAGE_ID=$(openstack image list | grep "CoreOS" | head -1 | cut -d "|" -f 2 | trim)
COMPUTE_AZ=${COMPUTE_AZ:-melbourne-qh2-uom}
SSH_KEY=${SSH_KEY:-DIT4C}
START_NUM=${START_NUM:-1}

echo "Using image:"
openstack image show $IMAGE_ID

HINTS=""
for i in $(eval echo {$START_NUM..$NUM})
do
  CN_NAME=$(printf "%s-%02d" $(echo $PREFIX | tr '[:upper:]' '[:lower:]') $i)
  echo $CN_NAME
  # Nova instance creation
  INSTANCE_ID=$(openstack server create \
    --flavor $COMPUTE_FLAVOR --image $IMAGE_ID \
    --availability-zone $COMPUTE_AZ --security-group $SECURITY_GROUP \
    --key-name $SSH_KEY \
    --user-data $CLOUD_CONFIG $HINTS \
    --wait $CN_NAME | value_from_table 'id')
  HINTS="$HINTS --hint different_host=$INSTANCE_ID"
done