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This commit is contained in:
Michael DeHaan 2012-08-06 20:02:02 -04:00
parent a1b4123931
commit 0810f26095
3 changed files with 77 additions and 77 deletions

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@ -6,15 +6,15 @@ Cobbler external inventory script
Ansible has a feature where instead of reading from /etc/ansible/hosts Ansible has a feature where instead of reading from /etc/ansible/hosts
as a text file, it can query external programs to obtain the list as a text file, it can query external programs to obtain the list
of hosts, groups the hosts are in, and even variables to assign to each host. of hosts, groups the hosts are in, and even variables to assign to each host.
To use this, copy this file over /etc/ansible/hosts and chmod +x the file. To use this, copy this file over /etc/ansible/hosts and chmod +x the file.
This, more or less, allows you to keep one central database containing This, more or less, allows you to keep one central database containing
info about all of your managed instances. info about all of your managed instances.
This script is an example of sourcing that data from Cobbler This script is an example of sourcing that data from Cobbler
(http://cobbler.github.com). With cobbler each --mgmt-class in cobbler (http://cobbler.github.com). With cobbler each --mgmt-class in cobbler
will correspond to a group in Ansible, and --ks-meta variables will be will correspond to a group in Ansible, and --ks-meta variables will be
passed down for use in templates or even in argument lines. passed down for use in templates or even in argument lines.
NOTE: The cobbler system names will not be used. Make sure a NOTE: The cobbler system names will not be used. Make sure a
@ -23,11 +23,11 @@ appears with two DNS names we do not add it twice because we don't want
ansible talking to it twice. The first one found will be used. If no ansible talking to it twice. The first one found will be used. If no
--dns-name is set the system will NOT be visible to ansible. We do --dns-name is set the system will NOT be visible to ansible. We do
not add cobbler system names because there is no requirement in cobbler not add cobbler system names because there is no requirement in cobbler
that those correspond to addresses. that those correspond to addresses.
See http://ansible.github.com/api.html for more info See http://ansible.github.com/api.html for more info
Tested with Cobbler 2.0.11. Tested with Cobbler 2.0.11.
""" """
# (c) 2012, Michael DeHaan <michael.dehaan@gmail.com> # (c) 2012, Michael DeHaan <michael.dehaan@gmail.com>
@ -83,8 +83,8 @@ if len(sys.argv) == 2 and (sys.argv[1] == '--list'):
for (iname, ivalue) in interfaces.iteritems(): for (iname, ivalue) in interfaces.iteritems():
this_dns_name = ivalue.get('dns_name', None) this_dns_name = ivalue.get('dns_name', None)
if this_dns_name is not None: if this_dns_name is not None:
dns_name = this_dns_name dns_name = this_dns_name
if dns_name is None: if dns_name is None:
continue continue
@ -95,7 +95,7 @@ if len(sys.argv) == 2 and (sys.argv[1] == '--list'):
# hostname is not really what we want to insert, really insert the # hostname is not really what we want to insert, really insert the
# first DNS name but no further DNS names # first DNS name but no further DNS names
groups[cls].append(dns_name) groups[cls].append(dns_name)
print json.dumps(groups) print json.dumps(groups)
sys.exit(0) sys.exit(0)

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

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@ -45,7 +45,7 @@ class InventoryParserYaml(object):
else: else:
host = Host(hostname) host = Host(hostname)
self._hosts[hostname] = host self._hosts[hostname] = host
return host return host
# see file 'test/yaml_hosts' for syntax # see file 'test/yaml_hosts' for syntax
@ -79,7 +79,7 @@ class InventoryParserYaml(object):
if type(vars) == list: if type(vars) == list:
for subitem in vars: for subitem in vars:
for (k,v) in subitem.items(): for (k,v) in subitem.items():
host.set_variable(k,v) host.set_variable(k,v)
elif type(vars) == dict: elif type(vars) == dict:
for (k,v) in subresult.get('vars',{}).items(): for (k,v) in subresult.get('vars',{}).items():
host.set_variable(k,v) host.set_variable(k,v)
@ -91,7 +91,7 @@ class InventoryParserYaml(object):
vars = item.get('vars',{}) vars = item.get('vars',{})
if type(vars) == dict: if type(vars) == dict:
for (k,v) in item.get('vars',{}).items(): for (k,v) in item.get('vars',{}).items():
group.set_variable(k,v) group.set_variable(k,v)
elif type(vars) == list: elif type(vars) == list:
for subitem in vars: for subitem in vars:
if type(subitem) != dict: if type(subitem) != dict:
@ -159,7 +159,7 @@ if __name__ == "__main__":
if group_name == 'all': if group_name == 'all':
continue continue
hosts = record.hosts hosts = record.hosts
result = result + "[%s]\n" % record.name result = result + "[%s]\n" % record.name
for h in hosts: for h in hosts:
@ -186,7 +186,7 @@ if __name__ == "__main__":
hostfh = open(hostfile, 'w') hostfh = open(hostfile, 'w')
hostfh.write(yaml.dump(host_record.get_variables())) hostfh.write(yaml.dump(host_record.get_variables()))
hostfh.close() hostfh.close()
# also need to keep a hash of variables per each host # also need to keep a hash of variables per each host
# and variables per each group # and variables per each group
@ -198,7 +198,7 @@ if __name__ == "__main__":
fdh.close() fdh.close()
print "* COMPLETE: review your new inventory file and replace your original when ready" print "* COMPLETE: review your new inventory file and replace your original when ready"
print "* new inventory file saved as %s" % newfilepath print "* new inventory file saved as %s" % newfilepath
print "* edit group specific variables in %s/group_vars/" % dirname print "* edit group specific variables in %s/group_vars/" % dirname
print "* edit host specific variables in %s/host_vars/" % dirname print "* edit host specific variables in %s/host_vars/" % dirname