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Flexible tag-based naming for ec2 hosts

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Introduces destination_format and destination_format_tags
to allow the construction of host names based on one or
more ec2 tags and a python format string.
This commit is contained in:
Andy Grimm 2015-03-09 10:49:54 -04:00
parent 17103dd4cc
commit 009d0a4bb4
2 changed files with 20 additions and 1 deletions
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10
contrib/inventory/ec2.ini
View file

@ -40,6 +40,16 @@ destination_variable = public_dns_name
# vpc_destination_variable = 'private_ip_address'
vpc_destination_variable = ip_address
# The following two settings allow flexible ansible host naming based on a
# python format string and a comma-separated list of ec2 tags. Note that:
#
# 1) If the tags referenced are not present for some instances, empty strings
# will be substituted in the format string.
# 2) This overrides both destination_variable and vpc_destination_variable.
#
#destination_format = {0}.{1}.example.com
#destination_format_tags = Name,environment
# To tag instances on EC2 with the resource records that point to them from
# Route53, uncomment and set 'route53' to True.
route53 = False

11
contrib/inventory/ec2.py
View file

@ -220,6 +220,13 @@ class Ec2Inventory(object):
# Destination addresses
self.destination_variable = config.get('ec2', 'destination_variable')
self.vpc_destination_variable = config.get('ec2', 'vpc_destination_variable')
if config.has_option('ec2', 'destination_format') and \
config.has_option('ec2', 'destination_format_tags'):
self.destination_format = config.get('ec2', 'destination_format')
self.destination_format_tags = config.get('ec2', 'destination_format_tags').split(',')
else:
self.destination_format = None
self.destination_format_tags = None
# Route53
self.route53_enabled = config.getboolean('ec2', 'route53')
@ -536,7 +543,9 @@ class Ec2Inventory(object):
return
# Select the best destination address
if instance.subnet_id:
if self.destination_format and self.destination_format_tags:
dest = self.destination_format.format(*[ getattr(instance, 'tags').get(tag, '') for tag in self.destination_format_tags ])
elif instance.subnet_id:
dest = getattr(instance, self.vpc_destination_variable, None)
if dest is None:
dest = getattr(instance, 'tags').get(self.vpc_destination_variable, None)