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Merge pull request #11261 from schrodervictor/adds-elasticache-to-ec2-dynamic-inventory

Browse Source 
Adds ElastiCache to ec2 dynamic inventory plugin
pull/11452/head
Brian Coca 9 years ago
parent 7c1d569a26 df77d087a5
commit 468770c894
2 changed files with 450 additions and 5 deletions
Show Stats Download Patch File Download Diff File

19
plugins/inventory/ec2.ini
Unescape Escape View File

@ -47,6 +47,9 @@ route53 = False
# To exclude RDS instances from the inventory, uncomment and set to False.
#rds = False
# To exclude ElastiCache instances from the inventory, uncomment and set to False.
#elasticache = False
# Additionally, you can specify the list of zones to exclude looking up in
# 'route53_excluded_zones' as a comma-separated list.
# route53_excluded_zones = samplezone1.com, samplezone2.com
@ -59,6 +62,18 @@ all_instances = False
# 'all_rds_instances' to True return all RDS instances regardless of state.
all_rds_instances = False
# By default, only ElastiCache clusters and nodes in the 'available' state
# are returned. Set 'all_elasticache_clusters' and/or 'all_elastic_nodes'
# to True return all ElastiCache clusters and nodes, regardless of state.
#
# Note that all_elasticache_nodes only applies to listed clusters. That means
# if you set all_elastic_clusters to false, no node will be return from
# unavailable clusters, regardless of the state and to what you set for
# all_elasticache_nodes.
all_elasticache_replication_groups = False
all_elasticache_clusters = False
all_elasticache_nodes = False
# API calls to EC2 are slow. For this reason, we cache the results of an API
# call. Set this to the path you want cache files to be written to. Two files
# will be written to this directory:
@ -89,6 +104,10 @@ group_by_tag_none = True
group_by_route53_names = True
group_by_rds_engine = True
group_by_rds_parameter_group = True
group_by_elasticache_engine = True
group_by_elasticache_cluster = True
group_by_elasticache_parameter_group = True
group_by_elasticache_replication_group = True
# If you only want to include hosts that match a certain regular expression
# pattern_include = staging-*

432
plugins/inventory/ec2.py
Unescape Escape View File

@ -121,6 +121,7 @@ from time import time
import boto
from boto import ec2
from boto import rds
from boto import elasticache
from boto import route53
import six
@ -232,16 +233,41 @@ class Ec2Inventory(object):
if config.has_option('ec2', 'rds'):
self.rds_enabled = config.getboolean('ec2', 'rds')
# Return all EC2 and RDS instances (if RDS is enabled)
# Include ElastiCache instances?
self.elasticache_enabled = True
if config.has_option('ec2', 'elasticache'):
self.elasticache_enabled = config.getboolean('ec2', 'elasticache')
# Return all EC2 instances?
if config.has_option('ec2', 'all_instances'):
self.all_instances = config.getboolean('ec2', 'all_instances')
else:
self.all_instances = False
# Return all RDS instances? (if RDS is enabled)
if config.has_option('ec2', 'all_rds_instances') and self.rds_enabled:
self.all_rds_instances = config.getboolean('ec2', 'all_rds_instances')
else:
self.all_rds_instances = False
# Return all ElastiCache replication groups? (if ElastiCache is enabled)
if config.has_option('ec2', 'all_elasticache_replication_groups') and self.elasticache_enabled:
self.all_elasticache_replication_groups = config.getboolean('ec2', 'all_elasticache_replication_groups')
else:
self.all_elasticache_replication_groups = False
# Return all ElastiCache clusters? (if ElastiCache is enabled)
if config.has_option('ec2', 'all_elasticache_clusters') and self.elasticache_enabled:
self.all_elasticache_clusters = config.getboolean('ec2', 'all_elasticache_clusters')
else:
self.all_elasticache_clusters = False
# Return all ElastiCache nodes? (if ElastiCache is enabled)
if config.has_option('ec2', 'all_elasticache_nodes') and self.elasticache_enabled:
self.all_elasticache_nodes = config.getboolean('ec2', 'all_elasticache_nodes')
else:
self.all_elasticache_nodes = False
# Cache related
cache_dir = os.path.expanduser(config.get('ec2', 'cache_path'))
if not os.path.exists(cache_dir):
@ -272,6 +298,10 @@ class Ec2Inventory(object):
'group_by_route53_names',
'group_by_rds_engine',
'group_by_rds_parameter_group',
'group_by_elasticache_engine',
'group_by_elasticache_cluster',
'group_by_elasticache_parameter_group',
'group_by_elasticache_replication_group',
]
for option in group_by_options:
if config.has_option('ec2', option):
@ -334,6 +364,9 @@ class Ec2Inventory(object):
self.get_instances_by_region(region)
if self.rds_enabled:
self.get_rds_instances_by_region(region)
if self.elasticache_enabled:
self.get_elasticache_clusters_by_region(region)
self.get_elasticache_replication_groups_by_region(region)
self.write_to_cache(self.inventory, self.cache_path_cache)
self.write_to_cache(self.index, self.cache_path_index)
@ -394,6 +427,76 @@ class Ec2Inventory(object):
error = "Looks like AWS RDS is down:\n%s" % e.message
self.fail_with_error(error)
def get_elasticache_clusters_by_region(self, region):
''' Makes an AWS API call to the list of ElastiCache clusters (with
nodes' info) in a particular region.'''
# ElastiCache boto module doesn't provide a get_all_intances method,
# that's why we need to call describe directly (it would be called by
# the shorthand method anyway...)
try:
conn = elasticache.connect_to_region(region)
if conn:
# show_cache_node_info = True
# because we also want nodes' information
response = conn.describe_cache_clusters(None, None, None, True)
except boto.exception.BotoServerError as e:
error = e.reason
if e.error_code == 'AuthFailure':
error = self.get_auth_error_message()
if not e.reason == "Forbidden":
error = "Looks like AWS ElastiCache is down:\n%s" % e.message
self.fail_with_error(error)
try:
# Boto also doesn't provide wrapper classes to CacheClusters or
# CacheNodes. Because of that wo can't make use of the get_list
# method in the AWSQueryConnection. Let's do the work manually
clusters = response['DescribeCacheClustersResponse']['DescribeCacheClustersResult']['CacheClusters']
except KeyError as e:
error = "ElastiCache query to AWS failed (unexpected format)."
self.fail_with_error(error)
for cluster in clusters:
self.add_elasticache_cluster(cluster, region)
def get_elasticache_replication_groups_by_region(self, region):
''' Makes an AWS API call to the list of ElastiCache replication groups
in a particular region.'''
# ElastiCache boto module doesn't provide a get_all_intances method,
# that's why we need to call describe directly (it would be called by
# the shorthand method anyway...)
try:
conn = elasticache.connect_to_region(region)
if conn:
response = conn.describe_replication_groups()
except boto.exception.BotoServerError as e:
error = e.reason
if e.error_code == 'AuthFailure':
error = self.get_auth_error_message()
if not e.reason == "Forbidden":
error = "Looks like AWS ElastiCache [Replication Groups] is down:\n%s" % e.message
self.fail_with_error(error)
try:
# Boto also doesn't provide wrapper classes to ReplicationGroups
# Because of that wo can't make use of the get_list method in the
# AWSQueryConnection. Let's do the work manually
replication_groups = response['DescribeReplicationGroupsResponse']['DescribeReplicationGroupsResult']['ReplicationGroups']
except KeyError as e:
error = "ElastiCache [Replication Groups] query to AWS failed (unexpected format)."
self.fail_with_error(error)
for replication_group in replication_groups:
self.add_elasticache_replication_group(replication_group, region)
def get_auth_error_message(self):
''' create an informative error message if there is an issue authenticating'''
errors = ["Authentication error retrieving ec2 inventory."]
@ -632,6 +735,243 @@ class Ec2Inventory(object):
self.inventory["_meta"]["hostvars"][dest] = self.get_host_info_dict_from_instance(instance)
def add_elasticache_cluster(self, cluster, region):
''' Adds an ElastiCache cluster to the inventory and index, as long as
it's nodes are addressable '''
# Only want available clusters unless all_elasticache_clusters is True
if not self.all_elasticache_clusters and cluster['CacheClusterStatus'] != 'available':
return
# Select the best destination address
if 'ConfigurationEndpoint' in cluster and cluster['ConfigurationEndpoint']:
# Memcached cluster
dest = cluster['ConfigurationEndpoint']['Address']
is_redis = False
else:
# Redis sigle node cluster
# Because all Redis clusters are single nodes, we'll merge the
# info from the cluster with info about the node
dest = cluster['CacheNodes'][0]['Endpoint']['Address']
is_redis = True
if not dest:
# Skip clusters we cannot address (e.g. private VPC subnet)
return
# Add to index
self.index[dest] = [region, cluster['CacheClusterId']]
# Inventory: Group by instance ID (always a group of 1)
if self.group_by_instance_id:
self.inventory[cluster['CacheClusterId']] = [dest]
if self.nested_groups:
self.push_group(self.inventory, 'instances', cluster['CacheClusterId'])
# Inventory: Group by region
if self.group_by_region and not is_redis:
self.push(self.inventory, region, dest)
if self.nested_groups:
self.push_group(self.inventory, 'regions', region)
# Inventory: Group by availability zone
if self.group_by_availability_zone and not is_redis:
self.push(self.inventory, cluster['PreferredAvailabilityZone'], dest)
if self.nested_groups:
if self.group_by_region:
self.push_group(self.inventory, region, cluster['PreferredAvailabilityZone'])
self.push_group(self.inventory, 'zones', cluster['PreferredAvailabilityZone'])
# Inventory: Group by node type
if self.group_by_instance_type and not is_redis:
type_name = self.to_safe('type_' + cluster['CacheNodeType'])
self.push(self.inventory, type_name, dest)
if self.nested_groups:
self.push_group(self.inventory, 'types', type_name)
# Inventory: Group by VPC (information not available in the current
# AWS API version for ElastiCache)
# Inventory: Group by security group
if self.group_by_security_group and not is_redis:
# Check for the existance of the 'SecurityGroups' key and also if
# this key has some value. When the cluster is not placed in a SG
# the query can return None here and cause an error.
if 'SecurityGroups' in cluster and cluster['SecurityGroups'] is not None:
for security_group in cluster['SecurityGroups']:
key = self.to_safe("security_group_" + security_group['SecurityGroupId'])
self.push(self.inventory, key, dest)
if self.nested_groups:
self.push_group(self.inventory, 'security_groups', key)
# Inventory: Group by engine
if self.group_by_elasticache_engine and not is_redis:
self.push(self.inventory, self.to_safe("elasticache_" + cluster['Engine']), dest)
if self.nested_groups:
self.push_group(self.inventory, 'elasticache_engines', self.to_safe(cluster['Engine']))
# Inventory: Group by parameter group
if self.group_by_elasticache_parameter_group:
self.push(self.inventory, self.to_safe("elasticache_parameter_group_" + cluster['CacheParameterGroup']['CacheParameterGroupName']), dest)
if self.nested_groups:
self.push_group(self.inventory, 'elasticache_parameter_groups', self.to_safe(cluster['CacheParameterGroup']['CacheParameterGroupName']))
# Inventory: Group by replication group
if self.group_by_elasticache_replication_group and 'ReplicationGroupId' in cluster and cluster['ReplicationGroupId']:
self.push(self.inventory, self.to_safe("elasticache_replication_group_" + cluster['ReplicationGroupId']), dest)
if self.nested_groups:
self.push_group(self.inventory, 'elasticache_replication_groups', self.to_safe(cluster['ReplicationGroupId']))
# Global Tag: all ElastiCache clusters
self.push(self.inventory, 'elasticache_clusters', cluster['CacheClusterId'])
host_info = self.get_host_info_dict_from_describe_dict(cluster)
self.inventory["_meta"]["hostvars"][dest] = host_info
# Add the nodes
for node in cluster['CacheNodes']:
self.add_elasticache_node(node, cluster, region)
def add_elasticache_node(self, node, cluster, region):
''' Adds an ElastiCache node to the inventory and index, as long as
it is addressable '''
# Only want available nodes unless all_elasticache_nodes is True
if not self.all_elasticache_nodes and node['CacheNodeStatus'] != 'available':
return
# Select the best destination address
dest = node['Endpoint']['Address']
if not dest:
# Skip nodes we cannot address (e.g. private VPC subnet)
return
node_id = self.to_safe(cluster['CacheClusterId'] + '_' + node['CacheNodeId'])
# Add to index
self.index[dest] = [region, node_id]
# Inventory: Group by node ID (always a group of 1)
if self.group_by_instance_id:
self.inventory[node_id] = [dest]
if self.nested_groups:
self.push_group(self.inventory, 'instances', node_id)
# Inventory: Group by region
if self.group_by_region:
self.push(self.inventory, region, dest)
if self.nested_groups:
self.push_group(self.inventory, 'regions', region)
# Inventory: Group by availability zone
if self.group_by_availability_zone:
self.push(self.inventory, cluster['PreferredAvailabilityZone'], dest)
if self.nested_groups:
if self.group_by_region:
self.push_group(self.inventory, region, cluster['PreferredAvailabilityZone'])
self.push_group(self.inventory, 'zones', cluster['PreferredAvailabilityZone'])
# Inventory: Group by node type
if self.group_by_instance_type:
type_name = self.to_safe('type_' + cluster['CacheNodeType'])
self.push(self.inventory, type_name, dest)
if self.nested_groups:
self.push_group(self.inventory, 'types', type_name)
# Inventory: Group by VPC (information not available in the current
# AWS API version for ElastiCache)
# Inventory: Group by security group
if self.group_by_security_group:
# Check for the existance of the 'SecurityGroups' key and also if
# this key has some value. When the cluster is not placed in a SG
# the query can return None here and cause an error.
if 'SecurityGroups' in cluster and cluster['SecurityGroups'] is not None:
for security_group in cluster['SecurityGroups']:
key = self.to_safe("security_group_" + security_group['SecurityGroupId'])
self.push(self.inventory, key, dest)
if self.nested_groups:
self.push_group(self.inventory, 'security_groups', key)
# Inventory: Group by engine
if self.group_by_elasticache_engine:
self.push(self.inventory, self.to_safe("elasticache_" + cluster['Engine']), dest)
if self.nested_groups:
self.push_group(self.inventory, 'elasticache_engines', self.to_safe("elasticache_" + cluster['Engine']))
# Inventory: Group by parameter group (done at cluster level)
# Inventory: Group by replication group (done at cluster level)
# Inventory: Group by ElastiCache Cluster
if self.group_by_elasticache_cluster:
self.push(self.inventory, self.to_safe("elasticache_cluster_" + cluster['CacheClusterId']), dest)
# Global Tag: all ElastiCache nodes
self.push(self.inventory, 'elasticache_nodes', dest)
host_info = self.get_host_info_dict_from_describe_dict(node)
if dest in self.inventory["_meta"]["hostvars"]:
self.inventory["_meta"]["hostvars"][dest].update(host_info)
else:
self.inventory["_meta"]["hostvars"][dest] = host_info
def add_elasticache_replication_group(self, replication_group, region):
''' Adds an ElastiCache replication group to the inventory and index '''
# Only want available clusters unless all_elasticache_replication_groups is True
if not self.all_elasticache_replication_groups and replication_group['Status'] != 'available':
return
# Select the best destination address (PrimaryEndpoint)
dest = replication_group['NodeGroups'][0]['PrimaryEndpoint']['Address']
if not dest:
# Skip clusters we cannot address (e.g. private VPC subnet)
return
# Add to index
self.index[dest] = [region, replication_group['ReplicationGroupId']]
# Inventory: Group by ID (always a group of 1)
if self.group_by_instance_id:
self.inventory[replication_group['ReplicationGroupId']] = [dest]
if self.nested_groups:
self.push_group(self.inventory, 'instances', replication_group['ReplicationGroupId'])
# Inventory: Group by region
if self.group_by_region:
self.push(self.inventory, region, dest)
if self.nested_groups:
self.push_group(self.inventory, 'regions', region)
# Inventory: Group by availability zone (doesn't apply to replication groups)
# Inventory: Group by node type (doesn't apply to replication groups)
# Inventory: Group by VPC (information not available in the current
# AWS API version for replication groups
# Inventory: Group by security group (doesn't apply to replication groups)
# Check this value in cluster level
# Inventory: Group by engine (replication groups are always Redis)
if self.group_by_elasticache_engine:
self.push(self.inventory, 'elasticache_redis', dest)
if self.nested_groups:
self.push_group(self.inventory, 'elasticache_engines', 'redis')
# Global Tag: all ElastiCache clusters
self.push(self.inventory, 'elasticache_replication_groups', replication_group['ReplicationGroupId'])
host_info = self.get_host_info_dict_from_describe_dict(replication_group)
self.inventory["_meta"]["hostvars"][dest] = host_info
def get_route53_records(self):
''' Get and store the map of resource records to domain names that
@ -680,7 +1020,6 @@ class Ec2Inventory(object):
return list(name_list)
def get_host_info_dict_from_instance(self, instance):
instance_vars = {}
for key in vars(instance):
@ -726,6 +1065,91 @@ class Ec2Inventory(object):
return instance_vars
def get_host_info_dict_from_describe_dict(self, describe_dict):
''' Parses the dictionary returned by the API call into a flat list
of parameters. This method should be used only when 'describe' is
used directly because Boto doesn't provide specific classes. '''
# I really don't agree with prefixing everything with 'ec2'
# because EC2, RDS and ElastiCache are different services.
# I'm just following the pattern used until now to not break any
# compatibility.
host_info = {}
for key in describe_dict:
value = describe_dict[key]
key = self.to_safe('ec2_' + self.uncammelize(key))
# Handle complex types
# Target: Memcached Cache Clusters
if key == 'ec2_configuration_endpoint' and value:
host_info['ec2_configuration_endpoint_address'] = value['Address']
host_info['ec2_configuration_endpoint_port'] = value['Port']
# Target: Cache Nodes and Redis Cache Clusters (single node)
if key == 'ec2_endpoint' and value:
host_info['ec2_endpoint_address'] = value['Address']
host_info['ec2_endpoint_port'] = value['Port']
# Target: Redis Replication Groups
if key == 'ec2_node_groups' and value:
host_info['ec2_endpoint_address'] = value[0]['PrimaryEndpoint']['Address']
host_info['ec2_endpoint_port'] = value[0]['PrimaryEndpoint']['Port']
replica_count = 0
for node in value[0]['NodeGroupMembers']:
if node['CurrentRole'] == 'primary':
host_info['ec2_primary_cluster_address'] = node['ReadEndpoint']['Address']
host_info['ec2_primary_cluster_port'] = node['ReadEndpoint']['Port']
host_info['ec2_primary_cluster_id'] = node['CacheClusterId']
elif node['CurrentRole'] == 'replica':
host_info['ec2_replica_cluster_address_'+ str(replica_count)] = node['ReadEndpoint']['Address']
host_info['ec2_replica_cluster_port_'+ str(replica_count)] = node['ReadEndpoint']['Port']
host_info['ec2_replica_cluster_id_'+ str(replica_count)] = node['CacheClusterId']
replica_count += 1
# Target: Redis Replication Groups
if key == 'ec2_member_clusters' and value:
host_info['ec2_member_clusters'] = ','.join([str(i) for i in value])
# Target: All Cache Clusters
elif key == 'ec2_cache_parameter_group':
host_info["ec2_cache_node_ids_to_reboot"] = ','.join([str(i) for i in value['CacheNodeIdsToReboot']])
host_info['ec2_cache_parameter_group_name'] = value['CacheParameterGroupName']
host_info['ec2_cache_parameter_apply_status'] = value['ParameterApplyStatus']
# Target: Almost everything
elif key == 'ec2_security_groups':
# Skip if SecurityGroups is None
# (it is possible to have the key defined but no value in it).
if value is not None:
sg_ids = []
for sg in value:
sg_ids.append(sg['SecurityGroupId'])
host_info["ec2_security_group_ids"] = ','.join([str(i) for i in sg_ids])
# Target: Everything
# Preserve booleans and integers
elif type(value) in [int, bool]:
host_info[key] = value
# Target: Everything
# Sanitize string values
elif isinstance(value, six.string_types):
host_info[key] = value.strip()
# Target: Everything
# Replace None by an empty string
elif type(value) == type(None):
host_info[key] = ''
else:
# Remove non-processed complex types
pass
return host_info
def get_host_info(self):
''' Get variables about a specific host '''
@ -789,6 +1213,9 @@ class Ec2Inventory(object):
cache.write(json_data)
cache.close()
def uncammelize(self, key):
temp = re.sub('(.)([A-Z][a-z]+)', r'\1_\2', key)
return re.sub('([a-z0-9])([A-Z])', r'\1_\2', temp).lower()
def to_safe(self, word):
''' Converts 'bad' characters in a string to underscores so they can be
@ -796,7 +1223,6 @@ class Ec2Inventory(object):
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 '''

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