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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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16
examples/scripts/cobbler_external_inventory.py
View file

@ -6,15 +6,15 @@ Cobbler external inventory script
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
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.
This, more or less, allows you to keep one central database containing
info about all of your managed instances.
This script is an example of sourcing that data from 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
(http://cobbler.github.com). With cobbler each --mgmt-class in cobbler
will correspond to a group in Ansible, and --ks-meta variables will be
passed down for use in templates or even in argument lines.
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
--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
that those correspond to addresses.
that those correspond to addresses.
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>
@ -83,8 +83,8 @@ if len(sys.argv) == 2 and (sys.argv[1] == '--list'):
for (iname, ivalue) in interfaces.iteritems():
this_dns_name = ivalue.get('dns_name', None)
if this_dns_name is not None:
dns_name = this_dns_name
dns_name = this_dns_name
if dns_name is None:
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
# first DNS name but no further DNS names
groups[cls].append(dns_name)
print json.dumps(groups)
sys.exit(0)

126
examples/scripts/ec2_external_inventory.py
View file

@ -5,13 +5,13 @@ EC2 external inventory script
=================================
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
variables needed for Boto have already been set:
export AWS_ACCESS_KEY_ID='AK123'
export AWS_SECRET_ACCESS_KEY='abc123'
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:
@ -80,7 +80,7 @@ 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
Security groups are comma-separated in 'ec2_security_group_ids' and
'ec2_security_group_names'.
'''
@ -119,38 +119,38 @@ except ImportError:
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()
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 '''
@ -160,16 +160,16 @@ class Ec2Inventory(object):
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')
# Regions
self.regions = []
configRegions = config.get('ec2', 'regions')
@ -178,7 +178,7 @@ class Ec2Inventory(object):
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')
@ -188,27 +188,27 @@ class Ec2Inventory(object):
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,
parser.add_argument('--list', action='store_true', 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')
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)')
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.write_to_cache(self.inventory, self.cache_path_cache)
self.write_to_cache(self.index, self.cache_path_index)
@ -216,7 +216,7 @@ class Ec2Inventory(object):
def get_instances_by_region(self, region):
''' Makes an AWS EC2 API call to the list of instances in a particular
region '''
conn = ec2.connect_to_region(region)
reservations = conn.get_all_instances()
for reservation in reservations:
@ -231,16 +231,16 @@ class Ec2Inventory(object):
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 == 'terminated':
return
# Select the best destination address
if instance.subnet_id:
dest = getattr(instance, self.vpc_destination_variable)
@ -256,38 +256,38 @@ class Ec2Inventory(object):
# 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 security group
for group in instance.groups:
key = self.to_safe("security_group_" + group.name)
self.push(self.inventory, key, dest)
# 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)
self.push(self.inventory, key, 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()
(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
@ -315,20 +315,20 @@ class Ec2Inventory(object):
#print key
#print type(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):
''' 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]
my_dict[key] = [element]
def get_inventory_from_cache(self):
''' Reads the inventory from the cache file and returns it as a JSON
object '''
@ -344,34 +344,34 @@ class Ec2Inventory(object):
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()

12
examples/scripts/yaml_to_ini.py
View file

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