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Michael DeHaan
parent
a1b4123931
commit
0810f26095
3 changed files with 77 additions and 77 deletions
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@ -5,13 +5,13 @@ EC2 external inventory script
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=================================
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Generates inventory that Ansible can understand by making API request to
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AWS EC2 using the Boto library.
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AWS EC2 using the Boto library.
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NOTE: This script assumes Ansible is being executed where the environment
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variables needed for Boto have already been set:
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export AWS_ACCESS_KEY_ID='AK123'
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export AWS_SECRET_ACCESS_KEY='abc123'
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For more details, see: http://docs.pythonboto.org/en/latest/boto_config_tut.html
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When run against a specific host, this script returns the following variables:
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@ -80,7 +80,7 @@ In addition, if an instance has AWS Tags associated with it, each tag is a new
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variable named:
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- ec2_tag_[Key] = [Value]
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Security groups are comma-separated in 'ec2_security_group_ids' and
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Security groups are comma-separated in 'ec2_security_group_ids' and
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'ec2_security_group_names'.
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'''
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@ -119,38 +119,38 @@ except ImportError:
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class Ec2Inventory(object):
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def __init__(self):
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''' Main execution path '''
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# Inventory grouped by instance IDs, tags, security groups, regions,
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# and availability zones
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self.inventory = {}
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# Index of hostname (address) to instance ID
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self.index = {}
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# Read settings and parse CLI arguments
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self.read_settings()
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self.parse_cli_args()
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# Cache
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if self.args.refresh_cache:
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self.do_api_calls_update_cache()
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self.do_api_calls_update_cache()
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elif not self.is_cache_valid():
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self.do_api_calls_update_cache()
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# Data to print
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if self.args.host:
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data_to_print = self.get_host_info()
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elif self.args.list:
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# Display list of instances for inventory
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if len(self.inventory) == 0:
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data_to_print = self.get_inventory_from_cache()
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else:
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data_to_print = self.json_format_dict(self.inventory, True)
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print data_to_print
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def is_cache_valid(self):
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''' Determines if the cache files have expired, or if it is still valid '''
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@ -160,16 +160,16 @@ class Ec2Inventory(object):
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if (mod_time + self.cache_max_age) > current_time:
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if os.path.isfile(self.cache_path_index):
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return True
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return False
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def read_settings(self):
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''' Reads the settings from the ec2.ini file '''
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config = ConfigParser.SafeConfigParser()
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config.read(os.path.dirname(os.path.realpath(__file__)) + '/ec2.ini')
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# Regions
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self.regions = []
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configRegions = config.get('ec2', 'regions')
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@ -178,7 +178,7 @@ class Ec2Inventory(object):
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self.regions.append(regionInfo.name)
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else:
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self.regions = configRegions.split(",")
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# Destination addresses
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self.destination_variable = config.get('ec2', 'destination_variable')
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self.vpc_destination_variable = config.get('ec2', 'vpc_destination_variable')
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@ -188,27 +188,27 @@ class Ec2Inventory(object):
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self.cache_path_cache = cache_path + "/ansible-ec2.cache"
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self.cache_path_index = cache_path + "/ansible-ec2.index"
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self.cache_max_age = config.getint('ec2', 'cache_max_age')
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def parse_cli_args(self):
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''' Command line argument processing '''
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parser = argparse.ArgumentParser(description='Produce an Ansible Inventory file based on EC2')
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parser.add_argument('--list', action='store_true', default=True,
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parser.add_argument('--list', action='store_true', default=True,
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help='List instances (default: True)')
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parser.add_argument('--host', action='store',
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parser.add_argument('--host', action='store',
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help='Get all the variables about a specific instance')
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parser.add_argument('--refresh-cache', action='store_true', default=False,
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parser.add_argument('--refresh-cache', action='store_true', default=False,
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help='Force refresh of cache by making API requests to EC2 (default: False - use cache files)')
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self.args = parser.parse_args()
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def do_api_calls_update_cache(self):
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''' Do API calls to each region, and save data in cache files '''
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for region in self.regions:
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self.get_instances_by_region(region)
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self.write_to_cache(self.inventory, self.cache_path_cache)
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self.write_to_cache(self.index, self.cache_path_index)
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@ -216,7 +216,7 @@ class Ec2Inventory(object):
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def get_instances_by_region(self, region):
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''' Makes an AWS EC2 API call to the list of instances in a particular
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region '''
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conn = ec2.connect_to_region(region)
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reservations = conn.get_all_instances()
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for reservation in reservations:
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@ -231,16 +231,16 @@ class Ec2Inventory(object):
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for reservation in reservations:
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for instance in reservation.instances:
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return instance
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def add_instance(self, instance, region):
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''' Adds an instance to the inventory and index, as long as it is
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addressable '''
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# Only want running instances
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if instance.state == 'terminated':
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return
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# Select the best destination address
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if instance.subnet_id:
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dest = getattr(instance, self.vpc_destination_variable)
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@ -256,38 +256,38 @@ class Ec2Inventory(object):
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# Inventory: Group by instance ID (always a group of 1)
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self.inventory[instance.id] = [dest]
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# Inventory: Group by region
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self.push(self.inventory, region, dest)
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# Inventory: Group by availability zone
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self.push(self.inventory, instance.placement, dest)
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# Inventory: Group by security group
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for group in instance.groups:
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key = self.to_safe("security_group_" + group.name)
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self.push(self.inventory, key, dest)
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# Inventory: Group by tag keys
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for k, v in instance.tags.iteritems():
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key = self.to_safe("tag_" + k + "=" + v)
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self.push(self.inventory, key, dest)
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self.push(self.inventory, key, dest)
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def get_host_info(self):
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''' Get variables about a specific host '''
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if len(self.index) == 0:
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# Need to load index from cache
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self.load_index_from_cache()
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(region, instance_id) = self.index[self.args.host]
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instance = self.get_instance(region, instance_id)
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instance_vars = {}
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for key in vars(instance):
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value = getattr(instance, key)
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key = self.to_safe('ec2_' + key)
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# Handle complex types
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if type(value) in [int, bool]:
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instance_vars[key] = value
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@ -315,20 +315,20 @@ class Ec2Inventory(object):
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#print key
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#print type(value)
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#print value
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return self.json_format_dict(instance_vars, True)
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return self.json_format_dict(instance_vars, True)
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def push(self, my_dict, key, element):
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''' Pushed an element onto an array that may not have been defined in
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the dict '''
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if key in my_dict:
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my_dict[key].append(element);
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else:
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my_dict[key] = [element]
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my_dict[key] = [element]
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def get_inventory_from_cache(self):
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''' Reads the inventory from the cache file and returns it as a JSON
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object '''
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@ -344,34 +344,34 @@ class Ec2Inventory(object):
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cache = open(self.cache_path_index, 'r')
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json_index = cache.read()
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self.index = json.loads(json_index)
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def write_to_cache(self, data, filename):
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''' Writes data in JSON format to a file '''
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json_data = self.json_format_dict(data, True)
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cache = open(filename, 'w')
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cache.write(json_data)
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cache.close()
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def to_safe(self, word):
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''' Converts 'bad' characters in a string to underscores so they can be
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used as Ansible groups '''
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return re.sub("[^A-Za-z0-9\-]", "_", word)
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def json_format_dict(self, data, pretty=False):
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''' Converts a dict to a JSON object and dumps it as a formatted
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string '''
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if pretty:
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return json.dumps(data, sort_keys=True, indent=2)
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else:
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return json.dumps(data)
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# Run the script
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Ec2Inventory()
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