Remapping an EC2 instance to an elastic IP in node.js. Useful for restarts and reboots.

gistfile1.js

/**
 * Author: Michael R. Johnston
 * Date: 8/26/13
 * Time: 9:34 AM
 */
var AWS = require('aws-sdk');
var request = require('request');


// Fill in your info here
AWS.config = {
    "accessKeyId": "XXXXXXXXXXXXXXXXXXXXX",
    "secretAccessKey": "XXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
    "region": "us-east-1",
    "maxRedirects": 10
};

var ec2 = new AWS.EC2();

// Change to the elastic IP you're assigning
var PublicIp = '54.221.243.199';

// Grab the instanceId for this instance
request.get('http://169.254.169.254/latest/meta-data/instance-id',function(err,response, instanceId){
    if(!err){
        // Remove 'DryRun' when putting into production
        var params = {
            "DryRun": true,
            "InstanceId": instanceId,
            "PublicIp": PublicIp
        };

        ec2.associateAddress(params,function(err,data){
            if(!err){
                console.log('Address assigned: %s', JSON.stringify(data));
            } else {
                console.log('Error associating address to instance: %s', err);
            }
        });

    } else {
        console.log('Unable to obtain instance id');
    }

});