Created
July 29, 2021 21:45
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Python script to bulk update DNS entries in Route53
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#!/usr/bin/env python | |
""" | |
Bulk Update DNS on AWS Route53 | |
""" | |
import argparse | |
import sys | |
import boto3 | |
parser = argparse.ArgumentParser() | |
parser.add_argument("--zoneId", type=str, default="", help="Route53 Zone Id, recommend setting this as an environment variable") | |
parser.add_argument("--hostname", type=str, default="", help="The hostname to update example.domain.com") | |
parser.add_argument("--dns", type=str, default="", help="The new dns value") | |
args = parser.parse_args() | |
route53 = boto3.client('route53') | |
zoneid = args.zoneId | |
hostname = args.hostname | |
CNAME = args.dns | |
if not zoneid or not hostname or not CNAME: | |
print("Please provide a zone id, hostname and new dns") | |
return | |
# | |
# updatedns - Updates DNS for a hos name | |
# | |
def updatedns(hostname, newdns): | |
# Add trailing dot to hostname if it doesn't have one | |
if hostname[-1:] != ".": | |
hostname += "." | |
print('Hostname: %s' % hostname) | |
print('Current DNS: %s' % newdns) | |
# If you only have one hosted zone, you can do something like this to look in the zone | |
# Initialize the connection to AWS Route53 | |
# route53 = Route53Connection() | |
# route53zones = route53.get_all_hosted_zones() | |
# route53zones = route53.list_resource_record_sets(HostedZoneId=) | |
sets = route53.list_resource_record_sets(HostedZoneId=zoneid) | |
for rset in sets['ResourceRecordSets']: | |
if rset['Name'] == hostname and rset['Type'] == 'CNAME': | |
curdnsrecord = rset['ResourceRecords'] | |
print(curdnsrecord) | |
if type(curdnsrecord) in [list, tuple, set]: | |
for record in curdnsrecord: | |
curdns = record | |
# print('Current DNS CNAME: %s' % curdns) | |
curttl = rset['TTL'] | |
# print('Current DNS TTL: %s' % curttl) | |
if curdns != newdns: | |
# UPSERT the record | |
print('Updating %s' % hostname) | |
route53.change_resource_record_sets( | |
HostedZoneId=zoneid, | |
ChangeBatch={ | |
'Changes': [ | |
{ | |
'Action': 'UPSERT', | |
'ResourceRecordSet': { | |
'Name': hostname, | |
'Type': 'CNAME', | |
'TTL': curttl, | |
'ResourceRecords': [ | |
{ | |
'Value': newdns | |
} | |
] | |
} | |
} | |
] | |
} | |
) | |
try: | |
updatedns(hostname, CNAME) | |
except: | |
print('DNS Update failed. Check credentials or IAM roles.') |
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