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Diffstat (limited to 'inventory/aws/ec2.py')
| -rwxr-xr-x | inventory/aws/ec2.py | 610 |
1 files changed, 610 insertions, 0 deletions
diff --git a/inventory/aws/ec2.py b/inventory/aws/ec2.py new file mode 100755 index 000000000..84841d3f0 --- /dev/null +++ b/inventory/aws/ec2.py @@ -0,0 +1,610 @@ +#!/usr/bin/env python + +''' +EC2 external inventory script +================================= + +Generates inventory that Ansible can understand by making API request to +AWS EC2 using the Boto library. + +NOTE: This script assumes Ansible is being executed where the environment +variables needed for Boto have already been set: + export AWS_ACCESS_KEY_ID='AK123' + export AWS_SECRET_ACCESS_KEY='abc123' + +This script also assumes there is an ec2.ini file alongside it. To specify a +different path to ec2.ini, define the EC2_INI_PATH environment variable: + + export EC2_INI_PATH=/path/to/my_ec2.ini + +If you're using eucalyptus you need to set the above variables and +you need to define: + + export EC2_URL=http://hostname_of_your_cc:port/services/Eucalyptus + +For more details, see: http://docs.pythonboto.org/en/latest/boto_config_tut.html + +When run against a specific host, this script returns the following variables: + - ec2_ami_launch_index + - ec2_architecture + - ec2_association + - ec2_attachTime + - ec2_attachment + - ec2_attachmentId + - ec2_client_token + - ec2_deleteOnTermination + - ec2_description + - ec2_deviceIndex + - ec2_dns_name + - ec2_eventsSet + - ec2_group_name + - ec2_hypervisor + - ec2_id + - ec2_image_id + - ec2_instanceState + - ec2_instance_type + - ec2_ipOwnerId + - ec2_ip_address + - ec2_item + - ec2_kernel + - ec2_key_name + - ec2_launch_time + - ec2_monitored + - ec2_monitoring + - ec2_networkInterfaceId + - ec2_ownerId + - ec2_persistent + - ec2_placement + - ec2_platform + - ec2_previous_state + - ec2_private_dns_name + - ec2_private_ip_address + - ec2_publicIp + - ec2_public_dns_name + - ec2_ramdisk + - ec2_reason + - ec2_region + - ec2_requester_id + - ec2_root_device_name + - ec2_root_device_type + - ec2_security_group_ids + - ec2_security_group_names + - ec2_shutdown_state + - ec2_sourceDestCheck + - ec2_spot_instance_request_id + - ec2_state + - ec2_state_code + - ec2_state_reason + - ec2_status + - ec2_subnet_id + - ec2_tenancy + - ec2_virtualization_type + - ec2_vpc_id + +These variables are pulled out of a boto.ec2.instance object. There is a lack of +consistency with variable spellings (camelCase and underscores) since this +just loops through all variables the object exposes. It is preferred to use the +ones with underscores when multiple exist. + +In addition, if an instance has AWS Tags associated with it, each tag is a new +variable named: + - ec2_tag_[Key] = [Value] + +Security groups are comma-separated in 'ec2_security_group_ids' and +'ec2_security_group_names'. +''' + +# (c) 2012, Peter Sankauskas +# +# This file is part of Ansible, +# +# Ansible is free software: you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. +# +# Ansible is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with Ansible. If not, see <http://www.gnu.org/licenses/>. + +###################################################################### + +import sys +import os +import argparse +import re +from time import time +import boto +from boto import ec2 +from boto import rds +from boto import route53 +import ConfigParser + +try: + import json +except ImportError: + import simplejson as json + + +class Ec2Inventory(object): + def _empty_inventory(self): + return {"_meta" : {"hostvars" : {}}} + + def __init__(self): + ''' Main execution path ''' + + # Inventory grouped by instance IDs, tags, security groups, regions, + # and availability zones + self.inventory = self._empty_inventory() + + # Index of hostname (address) to instance ID + self.index = {} + + # Read settings and parse CLI arguments + self.read_settings() + self.parse_cli_args() + + # Cache + if self.args.refresh_cache: + self.do_api_calls_update_cache() + elif not self.is_cache_valid(): + self.do_api_calls_update_cache() + + # Data to print + if self.args.host: + data_to_print = self.get_host_info() + + elif self.args.list: + # Display list of instances for inventory + if self.inventory == self._empty_inventory(): + data_to_print = self.get_inventory_from_cache() + else: + data_to_print = self.json_format_dict(self.inventory, True) + + print data_to_print + + + def is_cache_valid(self): + ''' Determines if the cache files have expired, or if it is still valid ''' + + if os.path.isfile(self.cache_path_cache): + mod_time = os.path.getmtime(self.cache_path_cache) + current_time = time() + if (mod_time + self.cache_max_age) > current_time: + if os.path.isfile(self.cache_path_index): + return True + + return False + + + def read_settings(self): + ''' Reads the settings from the ec2.ini file ''' + + config = ConfigParser.SafeConfigParser() + ec2_default_ini_path = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'ec2.ini') + ec2_ini_path = os.environ.get('EC2_INI_PATH', ec2_default_ini_path) + config.read(ec2_ini_path) + + # is eucalyptus? + self.eucalyptus_host = None + self.eucalyptus = False + if config.has_option('ec2', 'eucalyptus'): + self.eucalyptus = config.getboolean('ec2', 'eucalyptus') + if self.eucalyptus and config.has_option('ec2', 'eucalyptus_host'): + self.eucalyptus_host = config.get('ec2', 'eucalyptus_host') + + # Regions + self.regions = [] + configRegions = config.get('ec2', 'regions') + configRegions_exclude = config.get('ec2', 'regions_exclude') + if (configRegions == 'all'): + if self.eucalyptus_host: + self.regions.append(boto.connect_euca(host=self.eucalyptus_host).region.name) + else: + for regionInfo in ec2.regions(): + if regionInfo.name not in configRegions_exclude: + self.regions.append(regionInfo.name) + else: + self.regions = configRegions.split(",") + + # Destination addresses + self.destination_variable = config.get('ec2', 'destination_variable') + self.vpc_destination_variable = config.get('ec2', 'vpc_destination_variable') + + # Route53 + self.route53_enabled = config.getboolean('ec2', 'route53') + self.route53_excluded_zones = [] + if config.has_option('ec2', 'route53_excluded_zones'): + self.route53_excluded_zones.extend( + config.get('ec2', 'route53_excluded_zones', '').split(',')) + + # Cache related + cache_dir = os.path.expanduser(config.get('ec2', 'cache_path')) + if not os.path.exists(cache_dir): + os.makedirs(cache_dir) + + self.cache_path_cache = cache_dir + "/ansible-ec2.cache" + self.cache_path_index = cache_dir + "/ansible-ec2.index" + self.cache_max_age = config.getint('ec2', 'cache_max_age') + + + + def parse_cli_args(self): + ''' Command line argument processing ''' + + parser = argparse.ArgumentParser(description='Produce an Ansible Inventory file based on EC2') + parser.add_argument('--list', action='store_true', default=True, + help='List instances (default: True)') + parser.add_argument('--host', action='store', + help='Get all the variables about a specific instance') + parser.add_argument('--refresh-cache', action='store_true', default=False, + help='Force refresh of cache by making API requests to EC2 (default: False - use cache files)') + self.args = parser.parse_args() + + + def do_api_calls_update_cache(self): + ''' Do API calls to each region, and save data in cache files ''' + + if self.route53_enabled: + self.get_route53_records() + + for region in self.regions: + self.get_instances_by_region(region) + self.get_rds_instances_by_region(region) + + self.write_to_cache(self.inventory, self.cache_path_cache) + self.write_to_cache(self.index, self.cache_path_index) + + + def get_instances_by_region(self, region): + ''' Makes an AWS EC2 API call to the list of instances in a particular + region ''' + + try: + if self.eucalyptus: + conn = boto.connect_euca(host=self.eucalyptus_host) + conn.APIVersion = '2010-08-31' + else: + conn = ec2.connect_to_region(region) + + # connect_to_region will fail "silently" by returning None if the region name is wrong or not supported + if conn is None: + print("region name: %s likely not supported, or AWS is down. connection to region failed." % region) + sys.exit(1) + + reservations = conn.get_all_instances() + for reservation in reservations: + for instance in reservation.instances: + self.add_instance(instance, region) + + except boto.exception.BotoServerError, e: + if not self.eucalyptus: + print "Looks like AWS is down again:" + print e + sys.exit(1) + + def get_rds_instances_by_region(self, region): + ''' Makes an AWS API call to the list of RDS instances in a particular + region ''' + + try: + conn = rds.connect_to_region(region) + if conn: + instances = conn.get_all_dbinstances() + for instance in instances: + self.add_rds_instance(instance, region) + except boto.exception.BotoServerError, e: + if not e.reason == "Forbidden": + print "Looks like AWS RDS is down: " + print e + sys.exit(1) + + def get_instance(self, region, instance_id): + ''' Gets details about a specific instance ''' + if self.eucalyptus: + conn = boto.connect_euca(self.eucalyptus_host) + conn.APIVersion = '2010-08-31' + else: + conn = ec2.connect_to_region(region) + + # connect_to_region will fail "silently" by returning None if the region name is wrong or not supported + if conn is None: + print("region name: %s likely not supported, or AWS is down. connection to region failed." % region) + sys.exit(1) + + reservations = conn.get_all_instances([instance_id]) + for reservation in reservations: + for instance in reservation.instances: + return instance + + + def add_instance(self, instance, region): + ''' Adds an instance to the inventory and index, as long as it is + addressable ''' + + # Only want running instances + if instance.state != 'running': + return + + # Select the best destination address + if instance.subnet_id: + dest = getattr(instance, self.vpc_destination_variable) + else: + dest = getattr(instance, self.destination_variable) + + if not dest: + # Skip instances we cannot address (e.g. private VPC subnet) + return + + # Add to index + self.index[dest] = [region, instance.id] + + # Inventory: Group by instance ID (always a group of 1) + self.inventory[instance.id] = [dest] + + # Inventory: Group by region + self.push(self.inventory, region, dest) + + # Inventory: Group by availability zone + self.push(self.inventory, instance.placement, dest) + + # Inventory: Group by instance type + self.push(self.inventory, self.to_safe('type_' + instance.instance_type), dest) + + # Inventory: Group by key pair + if instance.key_name: + self.push(self.inventory, self.to_safe('key_' + instance.key_name), dest) + + # Inventory: Group by security group + try: + for group in instance.groups: + key = self.to_safe("security_group_" + group.name) + self.push(self.inventory, key, dest) + except AttributeError: + print 'Package boto seems a bit older.' + print 'Please upgrade boto >= 2.3.0.' + sys.exit(1) + + # Inventory: Group by tag keys + for k, v in instance.tags.iteritems(): + key = self.to_safe("tag_" + k + "=" + v) + self.push(self.inventory, key, dest) + + # Inventory: Group by Route53 domain names if enabled + if self.route53_enabled: + route53_names = self.get_instance_route53_names(instance) + for name in route53_names: + self.push(self.inventory, name, dest) + + # Global Tag: tag all EC2 instances + self.push(self.inventory, 'ec2', dest) + + self.inventory["_meta"]["hostvars"][dest] = self.get_host_info_dict_from_instance(instance) + + + def add_rds_instance(self, instance, region): + ''' Adds an RDS instance to the inventory and index, as long as it is + addressable ''' + + # Only want available instances + if instance.status != 'available': + return + + # Select the best destination address + #if instance.subnet_id: + #dest = getattr(instance, self.vpc_destination_variable) + #else: + #dest = getattr(instance, self.destination_variable) + dest = instance.endpoint[0] + + if not dest: + # Skip instances we cannot address (e.g. private VPC subnet) + return + + # Add to index + self.index[dest] = [region, instance.id] + + # Inventory: Group by instance ID (always a group of 1) + self.inventory[instance.id] = [dest] + + # Inventory: Group by region + self.push(self.inventory, region, dest) + + # Inventory: Group by availability zone + self.push(self.inventory, instance.availability_zone, dest) + + # Inventory: Group by instance type + self.push(self.inventory, self.to_safe('type_' + instance.instance_class), dest) + + # Inventory: Group by security group + try: + if instance.security_group: + key = self.to_safe("security_group_" + instance.security_group.name) + self.push(self.inventory, key, dest) + except AttributeError: + print 'Package boto seems a bit older.' + print 'Please upgrade boto >= 2.3.0.' + sys.exit(1) + + # Inventory: Group by engine + self.push(self.inventory, self.to_safe("rds_" + instance.engine), dest) + + # Inventory: Group by parameter group + self.push(self.inventory, self.to_safe("rds_parameter_group_" + instance.parameter_group.name), dest) + + # Global Tag: all RDS instances + self.push(self.inventory, 'rds', dest) + + + def get_route53_records(self): + ''' Get and store the map of resource records to domain names that + point to them. ''' + + r53_conn = route53.Route53Connection() + all_zones = r53_conn.get_zones() + + route53_zones = [ zone for zone in all_zones if zone.name[:-1] + not in self.route53_excluded_zones ] + + self.route53_records = {} + + for zone in route53_zones: + rrsets = r53_conn.get_all_rrsets(zone.id) + + for record_set in rrsets: + record_name = record_set.name + + if record_name.endswith('.'): + record_name = record_name[:-1] + + for resource in record_set.resource_records: + self.route53_records.setdefault(resource, set()) + self.route53_records[resource].add(record_name) + + + def get_instance_route53_names(self, instance): + ''' Check if an instance is referenced in the records we have from + Route53. If it is, return the list of domain names pointing to said + instance. If nothing points to it, return an empty list. ''' + + instance_attributes = [ 'public_dns_name', 'private_dns_name', + 'ip_address', 'private_ip_address' ] + + name_list = set() + + for attrib in instance_attributes: + try: + value = getattr(instance, attrib) + except AttributeError: + continue + + if value in self.route53_records: + name_list.update(self.route53_records[value]) + + return list(name_list) + + + def get_host_info_dict_from_instance(self, instance): + instance_vars = {} + for key in vars(instance): + value = getattr(instance, key) + key = self.to_safe('ec2_' + key) + + # Handle complex types + # state/previous_state changed to properties in boto in https://github.com/boto/boto/commit/a23c379837f698212252720d2af8dec0325c9518 + if key == 'ec2__state': + instance_vars['ec2_state'] = instance.state or '' + instance_vars['ec2_state_code'] = instance.state_code + elif key == 'ec2__previous_state': + instance_vars['ec2_previous_state'] = instance.previous_state or '' + instance_vars['ec2_previous_state_code'] = instance.previous_state_code + elif type(value) in [int, bool]: + instance_vars[key] = value + elif type(value) in [str, unicode]: + instance_vars[key] = value.strip() + elif type(value) == type(None): + instance_vars[key] = '' + elif key == 'ec2_region': + instance_vars[key] = value.name + elif key == 'ec2__placement': + instance_vars['ec2_placement'] = value.zone + elif key == 'ec2_tags': + for k, v in value.iteritems(): + key = self.to_safe('ec2_tag_' + k) + instance_vars[key] = v + elif key == 'ec2_groups': + group_ids = [] + group_names = [] + for group in value: + group_ids.append(group.id) + group_names.append(group.name) + instance_vars["ec2_security_group_ids"] = ','.join(group_ids) + instance_vars["ec2_security_group_names"] = ','.join(group_names) + else: + pass + # TODO Product codes if someone finds them useful + #print key + #print type(value) + #print value + + return instance_vars + + def get_host_info(self): + ''' Get variables about a specific host ''' + + if len(self.index) == 0: + # Need to load index from cache + self.load_index_from_cache() + + if not self.args.host in self.index: + # try updating the cache + self.do_api_calls_update_cache() + if not self.args.host in self.index: + # host migh not exist anymore + return self.json_format_dict({}, True) + + (region, instance_id) = self.index[self.args.host] + + instance = self.get_instance(region, instance_id) + return self.json_format_dict(self.get_host_info_dict_from_instance(instance), True) + + def push(self, my_dict, key, element): + ''' Pushed an element onto an array that may not have been defined in + the dict ''' + + if key in my_dict: + my_dict[key].append(element); + else: + my_dict[key] = [element] + + + def get_inventory_from_cache(self): + ''' Reads the inventory from the cache file and returns it as a JSON + object ''' + + cache = open(self.cache_path_cache, 'r') + json_inventory = cache.read() + return json_inventory + + + def load_index_from_cache(self): + ''' Reads the index from the cache file sets self.index ''' + + cache = open(self.cache_path_index, 'r') + json_index = cache.read() + self.index = json.loads(json_index) + + + def write_to_cache(self, data, filename): + ''' Writes data in JSON format to a file ''' + + json_data = self.json_format_dict(data, True) + cache = open(filename, 'w') + cache.write(json_data) + cache.close() + + + def to_safe(self, word): + ''' Converts 'bad' characters in a string to underscores so they can be + used as Ansible groups ''' + + return re.sub("[^A-Za-z0-9\-]", "_", word) + + + def json_format_dict(self, data, pretty=False): + ''' Converts a dict to a JSON object and dumps it as a formatted + string ''' + + if pretty: + return json.dumps(data, sort_keys=True, indent=2) + else: + return json.dumps(data) + + +# Run the script +Ec2Inventory() + |