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ansible/plugins/inventory/ec2.py
Michael DeHaan 76723f6b37 Merge pull request #2610 from peterjanes/devel 
Basic RDS support for EC2 inventory
2013-04-27 08:10:57 -07:00

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Python
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#!/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'
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
import ConfigParser
try:
import json
except ImportError:
import simplejson as json
class Ec2Inventory(object):
def __init__(self):
''' Main execution path '''
# Inventory grouped by instance IDs, tags, security groups, regions,
# and availability zones
self.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 len(self.inventory) == 0:
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()
config.read(os.path.dirname(os.path.realpath(__file__)) + '/ec2.ini')
# 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')
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():
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')
# Cache related
cache_path = config.get('ec2', 'cache_path')
self.cache_path_cache = cache_path + "/ansible-ec2.cache"
self.cache_path_index = cache_path + "/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 '''
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)
reservations = conn.get_all_instances()
for reservation in reservations:
for instance in reservation.instances:
self.add_instance(instance, region)
except boto.exception.BotoServerError as 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 as e:
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)
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)
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:
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)
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)
instance_vars = {}
for key in vars(instance):
value = getattr(instance, key)
key = self.to_safe('ec2_' + key)
# Handle complex types
if 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_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 self.json_format_dict(instance_vars, 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()
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