Updates a Route53 subdomain to a given IP address, designed for dynamic IPs

Update_R53.py

#!/usr/bin/python
import boto
from boto.route53.record import ResourceRecordSets
import urllib2

AWS_ACCESS_KEY_ID = 'access_key_here'
AWS_SECRET_ACCESS_KEY = 'secret_key_here'
AWS_R53_ZONE = 'zone_id_here'
AWS_R53_ADDR = 'subdomain.example.com'

ip = urllib2.urlopen('https://icanhazip.com').read().rstrip()

r53 = boto.route53.connect_to_region('universal',
        aws_access_key_id=AWS_ACCESS_KEY_ID,
        aws_secret_access_key=AWS_SECRET_ACCESS_KEY)

records = r53.get_all_rrsets(AWS_R53_ZONE,'A',AWS_R53_ADDR,maxitems=1)[0]

oldip = records.resource_records[0]
if ip in oldip:
        print "%s exists for %s." % (ip, AWS_R53_ADDR)
else:
        print "%s does NOT exist in %s." % (ip, AWS_R53_ADDR)
        print "Current value is %s." % (oldip)
        print "Updating records."
        r53rr = ResourceRecordSets(r53, AWS_R53_ZONE)
        print "Deleting old record."
        d_record = r53rr.add_change("DELETE", AWS_R53_ADDR, "A", 300)
        d_record.add_value(oldip)
        print "Creating updated record."
        c_record = r53rr.add_change("CREATE", AWS_R53_ADDR,"A", 300)
        c_record.add_value(ip)
        print "Committing changes."
        r53rr.commit()
        print "Records updated with new IP at %s." % (ip)