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Merge pull request #5901 from jctanner/ec2_tag_exact_count_2

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Add exact_count and count_tag to the ec2 module.
This commit is contained in:
jctanner 2014-02-07 10:57:01 -05:00
commit 6e7f684958
1 changed files with 197 additions and 9 deletions
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206
library/cloud/ec2
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@ -198,6 +198,21 @@ options:
required: false
default: null
aliases: []
exact_count:
version_added: "1.5"
description:
- An integer value which indicates how many instances that match the 'count_tag' parameter should be running. Instances are either created or terminated based on this value.
required: false
default: null
aliases: []
count_tag:
version_added: "1.5"
description:
- Used with 'exact_count' to determine how many nodes based on a specific tag criteria should be running. This can be expressed in multiple ways and is shown in the EXAMPLES section. For instance, one can request 25 servers that are tagged with "class=webserver".
required: false
default: null
aliases: []
requirements: [ "boto" ]
author: Seth Vidal, Tim Gerla, Lester Wade
@ -227,8 +242,9 @@ EXAMPLES = '''
wait: yes
wait_timeout: 500
count: 5
instance_tags: '{"db":"postgres"}'
monitoring=yes
instance_tags:
db: postgres
monitoring: yes
# Single instance with additional IOPS volume from snapshot
local_action:
@ -245,7 +261,7 @@ local_action:
device_type: io1
iops: 1000
volume_size: 100
monitoring=yes
monitoring: yes
# Multiple groups example
local_action:
@ -257,8 +273,9 @@ local_action:
wait: yes
wait_timeout: 500
count: 5
instance_tags: '{"db":"postgres"}'
monitoring=yes
instance_tags:
db: postgres
monitoring: yes
# Multiple instances with additional volume from snapshot
local_action:
@ -274,7 +291,7 @@ local_action:
- device_name: /dev/sdb
snapshot: snap-abcdef12
volume_size: 10
monitoring=yes
monitoring: yes
# VPC example
- local_action:
@ -372,10 +389,70 @@ local_action:
region: '{{ region }}'
state: stopped
wait: True
#
# Enforce that 5 instances with a tag "foo" are running
#
- local_action:
module: ec2
keypair: mykey
instance_type: c1.medium
image: emi-40603AD1
wait: yes
group: webserver
instance_tags:
foo: bar
exact_count: 5
count_tag: foo
#
# Enforce that 5 running instances named "database" with a "dbtype" of "postgres"
#
- local_action:
module: ec2
keypair: mykey
instance_type: c1.medium
image: emi-40603AD1
wait: yes
group: webserver
instance_tags:
Name: database
dbtype: postgres
exact_count: 5
count_tag:
Name: database
dbtype: postgres
#
# count_tag complex argument examples
#
# instances with tag foo
count_tag:
foo:
# instances with tag foo=bar
count_tag:
foo: bar
# instances with tags foo=bar & baz
count_tag:
foo: bar
baz:
# instances with tags foo & bar & baz=bang
count_tag:
- foo
- bar
- baz: bang
'''
import sys
import time
from ast import literal_eval
try:
import boto.ec2
@ -385,6 +462,68 @@ except ImportError:
print "failed=True msg='boto required for this module'"
sys.exit(1)
def find_running_instances_by_count_tag(module, ec2, count_tag):
# get reservations for instances that match tag(s) and are running
reservations = get_reservations(module, ec2, tags=count_tag, state="running")
instances = []
for res in reservations:
if hasattr(res, 'instances'):
for inst in res.instances:
instances.append(inst)
return reservations, instances
def _set_none_to_blank(dictionary):
result = dictionary
for k in result.iterkeys():
if type(result[k]) == dict:
result[k] = _set_non_to_blank(result[k])
elif not result[k]:
result[k] = ""
return result
def get_reservations(module, ec2, tags=None, state=None):
# TODO: filters do not work with tags that have underscores
filters = dict()
if tags is not None:
if type(tags) is str:
try:
tags = literal_eval(tags)
except:
pass
# if string, we only care that a tag of that name exists
if type(tags) is str:
filters.update({"tag-key": tags})
# if list, append each item to filters
if type(tags) is list:
for x in tags:
if type(x) is dict:
x = _set_none_to_blank(x)
filters.update(dict(("tag:"+tn, tv) for (tn,tv) in x.iteritems()))
else:
filters.update({"tag-key": x})
# if dict, add the key and value to the filter
if type(tags) is dict:
tags = _set_none_to_blank(tags)
filters.update(dict(("tag:"+tn, tv) for (tn,tv) in tags.iteritems()))
if state:
# http://stackoverflow.com/questions/437511/what-are-the-valid-instancestates-for-the-amazon-ec2-api
filters.update({'instance-state-name': state})
results = ec2.get_all_instances(filters=filters)
return results
def get_instance_info(inst):
"""
@ -473,7 +612,45 @@ def create_block_device(module, ec2, volume):
delete_on_termination=volume.get('delete_on_termination', False),
iops=volume.get('iops'))
def create_instances(module, ec2):
def enforce_count(module, ec2):
exact_count = module.params.get('exact_count')
count_tag = module.params.get('count_tag')
reservations, instances = find_running_instances_by_count_tag(module, ec2, count_tag)
changed = None
checkmode = False
instance_dict_array = None
changed_instance_ids = None
if len(instances) == exact_count:
changed = False
elif len(instances) < exact_count:
changed = True
to_create = exact_count - len(instances)
if not checkmode:
(instance_dict_array, changed_instance_ids, changed) \
= create_instances(module, ec2, override_count=to_create)
elif len(instances) > exact_count:
changed = True
to_remove = len(instances) - exact_count
if not checkmode:
all_instance_ids = sorted([ x.id for x in instances ])
remove_ids = all_instance_ids[0:to_remove]
(changed, instance_dict_array, changed_instance_ids) \
= terminate_instances(module, ec2, remove_ids)
terminated_list = []
for inst in instance_dict_array:
inst['state'] = "terminated"
terminated_list.append(inst)
instance_dict_array = terminated_list
return (instance_dict_array, changed_instance_ids, changed)
def create_instances(module, ec2, override_count=None):
"""
Creates new instances
@ -492,7 +669,10 @@ def create_instances(module, ec2):
zone = module.params.get('zone')
instance_type = module.params.get('instance_type')
image = module.params.get('image')
count = module.params.get('count')
if override_count:
count = override_count
else:
count = module.params.get('count')
monitoring = module.params.get('monitoring')
kernel = module.params.get('kernel')
ramdisk = module.params.get('ramdisk')
@ -506,6 +686,8 @@ def create_instances(module, ec2):
private_ip = module.params.get('private_ip')
instance_profile_name = module.params.get('instance_profile_name')
volumes = module.params.get('volumes')
exact_count = module.params.get('exact_count')
count_tag = module.params.get('count_tag')
# group_id and group_name are exclusive of each other
if group_id and group_name:
@ -832,6 +1014,8 @@ def main():
instance_profile_name = dict(),
instance_ids = dict(type='list'),
state = dict(default='present'),
exact_count = dict(type='int'),
count_tag = dict(),
volumes = dict(type='list'),
)
)
@ -857,7 +1041,11 @@ def main():
# Changed is always set to true when provisioning new instances
if not module.params.get('image'):
module.fail_json(msg='image parameter is required for new instance')
(instance_dict_array, new_instance_ids, changed) = create_instances(module, ec2)
if module.params.get('exact_count'):
(instance_dict_array, new_instance_ids, changed) = enforce_count(module, ec2)
else:
(instance_dict_array, new_instance_ids, changed) = create_instances(module, ec2)
module.exit_json(changed=changed, instance_ids=new_instance_ids, instances=instance_dict_array)