165 lines
9.3 KiB
Python
Executable File
165 lines
9.3 KiB
Python
Executable File
#!/usr/bin/python
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# Author: Colin Johnson / colin@cloudavail.com
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# Date: 2013-06-08
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# Version 0.1
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# License Type: GNU GENERAL PUBLIC LICENSE, Version 3
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#
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import boto.route53 # import boto.route53 (not just boto) - need to import correct module
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import ConfigParser # import ConfigParser - used for getting configuration
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import re # import re used to find/replace zone
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import sys # used to exit python program with exit code
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import os # used to get app_name
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import logging # used to write out log events - events that are neither required output nor error
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import argparse # used to gather user input
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def commit_record_changeset(destination_zone_record_changeset):
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try:
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destination_zone_record_changeset.commit()
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except boto.route53.exception.DNSServerError, error:
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sys.stdout.write("An error occured when attempting to commit records to the zone \"" + destination_zone_name + "\"\n")
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sys.stdout.write("The error message given was: " + error.error_message + ".\n")
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exit(69)
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def diff_record(record_a, record_a_object, record_b, record_b_object):
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compare_values = ["type", "ttl", "resource_records", "alias_hosted_zone_id", "alias_dns_name", "identifier", "weight", "region"]
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diff_record_result = False
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for value in compare_values:
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if getattr(record, value) != getattr(destination_zone_existing_resource_record_dict[record.name], value):
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diff_record_result = True
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return diff_record_result
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app_name = os.path.basename(__file__)
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parser = argparse.ArgumentParser()
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parser.add_argument("--loglevel", help="set the log level when running route53-migrate-zone.")
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parser.add_argument("--config", help="choose the configuration file to be used when running route53-migrate-zone.", default='config.ini')
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args = parser.parse_args()
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if args.loglevel is not None:
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log_level = str.upper(args.loglevel)
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logging.basicConfig(level=log_level)
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config_file_path = args.config
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config = ConfigParser.ConfigParser()
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config.read(config_file_path)
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#functions: currently supports newzone - the functions are set automatically by the route53-migrate-zone script
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functions = []
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#the source_zone user credentials should be read-only
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source_zone_access_key = config.get("source_zone_values", "source_zone_access_key")
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source_zone_secret_key = config.get("source_zone_values", "source_zone_secret_key")
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source_zone_name = config.get("source_zone_values", "source_zone_name")
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#
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destination_zone_access_key = config.get("destination_zone_values", "destination_zone_access_key")
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destination_zone_secret_key = config.get("destination_zone_values", "destination_zone_secret_key")
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destination_zone_name = config.get("destination_zone_values", "destination_zone_name")
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#best would be to retreive the destination_zone_id using destination_zone_name
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destination_zone_id = config.get("destination_zone_values", "destination_zone_id")
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record_types_to_migrate = ["A", "CNAME", "MX", "TXT"]
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if source_zone_name != destination_zone_name:
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print app_name + " will rewrite domain names ending in \"" + source_zone_name + "\" to domain names ending in \"" + destination_zone_name + "\""
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functions.append("newzone")
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#creates Route53Connection Object
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source_connection = boto.route53.Route53Connection(aws_access_key_id=source_zone_access_key, aws_secret_access_key=source_zone_secret_key)
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destination_connection = boto.route53.Route53Connection(aws_access_key_id=destination_zone_access_key, aws_secret_access_key=destination_zone_secret_key)
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#create connection to source_zone
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try:
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source_zone = source_connection.get_zone(source_zone_name)
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except boto.route53.exception.DNSServerError, error:
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sys.stderr.write("An error occured when attempting to create a connection to AWS.\n")
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sys.stderr.write("The error message given was: " + error.error_message + ".\n")
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exit(69)
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#create connection to destination_zone
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try:
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destination_zone = destination_connection.get_zone(destination_zone_name)
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except boto.route53.exception.DNSServerError, error:
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sys.stderr.write("An error occured when attempting to create a connection to AWS.\n")
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sys.stderr.write("The error message given was: " + error.error_message + ".\n")
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exit(69)
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#creates ResourceRecordSets object named source_zone_records (ResourceRecordSets = a collection of resource records)
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source_zone_records = source_zone.get_records()
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#creates ResourceRecordSets object named destination_zone_records (ResourceRecordSets = a collection of resource records)
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destination_zone_records = destination_zone.get_records()
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#resource_record_dict will be used to store all resource records that should be transferred
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resource_record_dict = {}
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#destination_zone_existing_resource_record_dict will be used to store all resource records that exist in destination zone
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destination_zone_existing_resource_record_dict = {}
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#creates a set of changes to be delivered to Route53
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destination_zone_record_changeset = boto.route53.record.ResourceRecordSets(destination_connection, destination_zone_id)
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for record in destination_zone_records:
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destination_zone_existing_resource_record_dict[record.name] = record
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#counts of records - should be replaced by dictionary
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examined_record_count = 0
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migrated_record_count = 0
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existing_records_in_destination_zone_count = 0
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identical_records_in_destination_zone_count = 0
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different_records_in_destination_zone_count = 0
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uncommitted_change_elements = 0
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#get records from source_zone
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for record in source_zone_records:
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if record.type in record_types_to_migrate:
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if "newzone" in functions:
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destination_record = re.sub(source_zone_name, destination_zone_name, record.name)
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logging.info("Record \"" + record.name + "\" will be rewritten as \"" + destination_record + "\".")
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record.name = destination_record
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#test if record exists in destination_zone
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if record.name in destination_zone_existing_resource_record_dict:
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existing_records_in_destination_zone_count += 1
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#compare records in source_domain and destination_domain, store result as diff_result
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diff_result = diff_record(record.name, record, record.name, destination_zone_existing_resource_record_dict)
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if diff_result is True:
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different_records_in_destination_zone_count += 1
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logging.info("Record \"" + record.name + "\" exists in source zone \"" + source_zone_name + "\" and destination zone \"" + destination_zone_name + "\" and is different.")
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elif diff_result is False:
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identical_records_in_destination_zone_count += 1
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logging.info("Record \"" + record.name + "\" exists in source zone \"" + source_zone_name + "\" and destination zone \"" + destination_zone_name + "\" and is identical.")
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else:
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sys.stderr.write("Diff of record " + record.name + " failed.\n")
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exit(70)
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else:
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resource_record_dict[record.name] = boto.route53.record.Record(name=record.name, type=record.type, ttl=record.ttl, resource_records=record.resource_records, alias_hosted_zone_id=record.alias_hosted_zone_id, alias_dns_name=record.alias_dns_name, identifier=record.identifier, weight=record.weight, region=record.region)
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for record in resource_record_dict:
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examined_record_count += 1
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#if record is an alias record we are not supporting yet
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if resource_record_dict[record].alias_dns_name is not None:
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logging.info("Record \"" + resource_record_dict[record].name + "\" is an alias record set and will not be migrated. " + app_name + " does not currently support alias record sets.")
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else:
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uncommitted_change_elements += 1
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destination_zone_record_changeset.add_change_record("CREATE", resource_record_dict[record])
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logging.debug("Uncommitted Record Count:" + str(uncommitted_change_elements))
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#if there are 99 uncomitted change elements than they must be committed - Amazon only accepts up to 99 change elements at a given time
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#if the number of examined records is equal to the number of records then we can commit as well - we are now done examing records
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if uncommitted_change_elements >= 99 or examined_record_count == len(resource_record_dict):
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logging.info("Flushing Records:" + str(uncommitted_change_elements))
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commit_record_changeset(destination_zone_record_changeset)
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migrated_record_count += uncommitted_change_elements
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uncommitted_change_elements = 0
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destination_zone_record_changeset = None
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destination_zone_record_changeset = boto.route53.record.ResourceRecordSets(destination_connection, destination_zone_id)
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print "Summary:"
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print "Records migrated from source zone: \"" + source_zone_name + "\" to destination zone: \"" + destination_zone_name + "\"."
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print "Record types selected for migration: " + str(record_types_to_migrate) + "."
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print "Records examined: " + str(examined_record_count)
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print "Records migrated: " + str(migrated_record_count) + "."
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print "Records not migrated because they exist in destination zone \"" + destination_zone_name + "\": " + str(existing_records_in_destination_zone_count)
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print "Records that exist in source zone \"" + source_zone_name + "\" and destination zone \"" + destination_zone_name + "\" and are identical: " + str(identical_records_in_destination_zone_count)
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print "Records that exist in source zone \"" + source_zone_name + "\" and destination zone \"" + destination_zone_name + "\" and are different: " + str(different_records_in_destination_zone_count)
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