Register EC2 instance public IP address with Route53

gistfile1.txt

#!/usr/bin/env python
#
# EC2Instance must have an IAM role assign to it which has access to Route53 services
# in this script the role is called 'route53role'
#

from boto import utils, ec2, route53

instance_metadata = utils.get_instance_metadata(timeout=0.5, num_retries=1)

region = instance_metadata['placement']['availability-zone'][:-1]
instance_id = instance_metadata['instance-id']
access_key_id = instance_metadata['iam']['security-credentials']['route53role']['AccessKeyId']
secret_access_key = instance_metadata['iam']['security-credentials']['route53role']['SecretAccessKey']
public_ip =  instance_metadata['network']['interfaces']['macs'].values()[0]['public-ipv4s']

# retrieve tag 'name'
#ec2_conn = ec2.connect_to_region(region, aws_access_key_id=access_key_id, aws_secret_access_key=secret_access_key)
#tags = ec2_conn.get_all_tags(filters={'resource-id': instance_id, 'key': 'ddns_hostname'})
#print tags
hostname = 's'# get_all_tags not working yet, so hard code hostname for now
domain='mydomain.com'

#  register 'name' as A record
r53_conn = route53.connect_to_region(region)
zone = r53_conn.get_zone(domain)
change_set = route53.record.ResourceRecordSets(r53_conn, zone.id)
changes1 = change_set.add_change("UPSERT", hostname + '.' + domain, type="A", ttl=3600)
changes1.add_value(public_ip)
change_set.commit()

gistfile2.txt

# copy the content to file etc/systemd/system/ddns-route53.service
# then 
# systemctl daemon-reload
# systemctl enable ddns-route53
# systemctl start ddns-route53

[Unit]
Description=python script to register public IP to route53 DNS server

[Service]
WorkingDirectory=/tmp
ExecStart=/usr/local/bin/ddns_route53
Restart=always

[Install]
WantedBy=multi-user.target