Simple script to set DNS for local IP

host-ip-to-route53.py

#!/usr/bin/env python
#
# This is a simple script to set the local IP to an Route53 zone
#
# Dependencies: 
#   pip install boto netifaces
#
# Usage:
#  host-ip-to-route53.py wlan1 machine1.domain.net
#
import boto
import netifaces
import socket
import sys


def update_a(host, ip):
    r53 = boto.connect_route53()
    zone = r53.get_zone('.'.join(h.split('.')[-2:]))
    try:
        zone.update_a(host, ip, ttl=60)
    except:  # where only brave man stands
        zone.add_a(host, ip, ttl=60)


def main(iface, host):
    ip = netifaces.ifaddresses(iface)[2][0]['addr']
 
    if socket.gethostbyname(host) != ip:
        print('Updating %s with %s' % (host, ip))
        update_a(host, ip)
    else:
        print('Host matches')


if __name__ == '__main__':
    iface = sys.argv[1]
    host = sys.argv[2]
    main(iface, host)