init script for grabbing an EC2 elastic IP

elastic_ip_init.sh

#!/bin/bash

###############################################################################
# CONFIG

# paths to key & cert files
export EC2_PRIVATE_KEY=
export EC2_CERT=

# needed for moving the IP
MY_ID=""          # different for each node, ex: i-xxxxxxxx
ELASTIC_IP=""  # ex: 174.129.253.XXX
###############################################################################


###############################################################################
# INIT
: ${OCF_FUNCTIONS_DIR=${OCF_ROOT}/resource.d/heartbeat}
if [ -f ${OCF_FUNCTIONS_DIR}/.ocf-shellfuncs ]; then
    . ${OCF_FUNCTIONS_DIR}/.ocf-shellfuncs
fi

USAGE="usage: $0 {start|stop|status|meta-data}";
###############################################################################

meta_data() {
    cat <<END
<?xml version="1.0"?>
<!DOCTYPE resource-agent SYSTEM "ra-api-1.dtd">
<resource-agent name="ElasticIP">
<version>1.0</version>
<longdesc lang="en">
This script manages Amazon EC2 Elastic IP addresses.
</longdesc>
<shortdesc lang="en">Manages Amazon EC2 Elastic IP addresses</shortdesc>

<actions>
<action name="start"   timeout="20s" />
<action name="stop"    timeout="20s" />
<action name="status"  timeout="20s" />
<action name="meta-data"  timeout="5s" />
</actions>
</resource-agent>
END
    exit $OCF_SUCCESS
}

ip_start() {
    ec2-associate-address "$ELASTIC_IP" -i "$MY_ID" > /dev/null
    echo $0 started
    exit $OCF_SUCCESS
}

ip_stop() {
    ec2-disassociate-address "$ELASTIC_IP" > /dev/null
    echo $0 stopped
    exit $OCF_SUCCESS
}

ip_status() {
    ec2-describe-addresses | grep "$ELASTIC_IP" | grep "$MY_ID" > /dev/null
    # grep will return true if this ip is mapped to this instance
    [ $? -eq 0 ] && echo $0 OK || echo $0 FAIL
    exit $OCF_SUCCESS
}

usage() {
    echo $USAGE >&2
    return $1
}

if [ $# -ne 1 ]; then
    usage $OCF_ERR_ARGS
fi

case $1 in
    meta-data)          meta_data;;
    start)              ip_start;;
    stop)               ip_stop;;
    status)             ip_status;;
    # monitor)            ip_monitor;;
    # validate-all)       ip_validate_all;;
    usage)              usage $OCF_SUCCESS;;
    *)                  usage $OCF_ERR_UNIMPLEMENTED;;
esac

exit $?