1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
|
# -*- coding: utf-8 -*-
# Copyright (c) 2018, Stefan Heitmueller <stefan.heitmueller@gmx.com>
# Copyright (c) 2018 Ansible Project
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
DOCUMENTATION = '''
name: docker_swarm
plugin_type: inventory
version_added: '2.8'
author:
- Stefan Heitmüller (@morph027) <stefan.heitmueller@gmx.com>
short_description: Ansible dynamic inventory plugin for Docker swarm nodes.
requirements:
- python >= 2.7
- L(Docker SDK for Python,https://docker-py.readthedocs.io/en/stable/) >= 1.10.0
extends_documentation_fragment:
- constructed
description:
- Reads inventories from the Docker swarm API.
- Uses a YAML configuration file docker_swarm.[yml|yaml].
- "The plugin returns following groups of swarm nodes: I(all) - all hosts; I(workers) - all worker nodes;
I(managers) - all manager nodes; I(leader) - the swarm leader node;
I(nonleaders) - all nodes except the swarm leader."
options:
plugin:
description: The name of this plugin, it should always be set to C(docker_swarm) for this plugin to
recognize it as it's own.
type: str
required: true
choices: docker_swarm
docker_host:
description:
- Socket of a Docker swarm manager node (C(tcp), C(unix)).
- "Use C(unix://var/run/docker.sock) to connect via local socket."
type: str
required: true
aliases: [ docker_url ]
verbose_output:
description: Toggle to (not) include all available nodes metadata (e.g. C(Platform), C(Architecture), C(OS),
C(EngineVersion))
type: bool
default: yes
tls:
description: Connect using TLS without verifying the authenticity of the Docker host server.
type: bool
default: no
validate_certs:
description: Toggle if connecting using TLS with or without verifying the authenticity of the Docker
host server.
type: bool
default: no
aliases: [ tls_verify ]
client_key:
description: Path to the client's TLS key file.
type: path
aliases: [ tls_client_key, key_path ]
ca_cert:
description: Use a CA certificate when performing server verification by providing the path to a CA
certificate file.
type: path
aliases: [ tls_ca_cert, cacert_path ]
client_cert:
description: Path to the client's TLS certificate file.
type: path
aliases: [ tls_client_cert, cert_path ]
tls_hostname:
description: When verifying the authenticity of the Docker host server, provide the expected name of
the server.
type: str
ssl_version:
description: Provide a valid SSL version number. Default value determined by ssl.py module.
type: str
api_version:
description:
- The version of the Docker API running on the Docker Host.
- Defaults to the latest version of the API supported by docker-py.
type: str
aliases: [ docker_api_version ]
timeout:
description:
- The maximum amount of time in seconds to wait on a response from the API.
- If the value is not specified in the task, the value of environment variable C(DOCKER_TIMEOUT)
will be used instead. If the environment variable is not set, the default value will be used.
type: int
default: 60
aliases: [ time_out ]
include_host_uri:
description: Toggle to return the additional attribute C(ansible_host_uri) which contains the URI of the
swarm leader in format of C(tcp://172.16.0.1:2376). This value may be used without additional
modification as value of option I(docker_host) in Docker Swarm modules when connecting via API.
The port always defaults to C(2376).
type: bool
default: no
include_host_uri_port:
description: Override the detected port number included in I(ansible_host_uri)
type: int
'''
EXAMPLES = '''
# Minimal example using local docker
plugin: docker_swarm
docker_host: unix://var/run/docker.sock
# Minimal example using remote docker
plugin: docker_swarm
docker_host: tcp://my-docker-host:2375
# Example using remote docker with unverified TLS
plugin: docker_swarm
docker_host: tcp://my-docker-host:2376
tls: yes
# Example using remote docker with verified TLS and client certificate verification
plugin: docker_swarm
docker_host: tcp://my-docker-host:2376
validate_certs: yes
ca_cert: /somewhere/ca.pem
client_key: /somewhere/key.pem
client_cert: /somewhere/cert.pem
# Example using constructed features to create groups and set ansible_host
plugin: docker_swarm
docker_host: tcp://my-docker-host:2375
strict: False
keyed_groups:
# add e.g. x86_64 hosts to an arch_x86_64 group
- prefix: arch
key: 'Description.Platform.Architecture'
# add e.g. linux hosts to an os_linux group
- prefix: os
key: 'Description.Platform.OS'
# create a group per node label
# e.g. a node labeled w/ "production" ends up in group "label_production"
# hint: labels containing special characters will be converted to safe names
- key: 'Spec.Labels'
prefix: label
'''
from ansible.errors import AnsibleError
from ansible.module_utils._text import to_native
from ansible.module_utils.six.moves.urllib.parse import urlparse
from ansible.plugins.inventory import BaseInventoryPlugin, Constructable
from ansible.parsing.utils.addresses import parse_address
try:
import docker
from docker.errors import TLSParameterError
from docker.tls import TLSConfig
HAS_DOCKER = True
except ImportError:
HAS_DOCKER = False
def update_tls_hostname(result):
if result['tls_hostname'] is None:
# get default machine name from the url
parsed_url = urlparse(result['docker_host'])
if ':' in parsed_url.netloc:
result['tls_hostname'] = parsed_url.netloc[:parsed_url.netloc.rindex(':')]
else:
result['tls_hostname'] = parsed_url
def _get_tls_config(fail_function, **kwargs):
try:
tls_config = TLSConfig(**kwargs)
return tls_config
except TLSParameterError as exc:
fail_function("TLS config error: %s" % exc)
def get_connect_params(auth, fail_function):
if auth['tls'] or auth['tls_verify']:
auth['docker_host'] = auth['docker_host'].replace('tcp://', 'https://')
if auth['tls_verify'] and auth['cert_path'] and auth['key_path']:
# TLS with certs and host verification
if auth['cacert_path']:
tls_config = _get_tls_config(client_cert=(auth['cert_path'], auth['key_path']),
ca_cert=auth['cacert_path'],
verify=True,
assert_hostname=auth['tls_hostname'],
ssl_version=auth['ssl_version'],
fail_function=fail_function)
else:
tls_config = _get_tls_config(client_cert=(auth['cert_path'], auth['key_path']),
verify=True,
assert_hostname=auth['tls_hostname'],
ssl_version=auth['ssl_version'],
fail_function=fail_function)
return dict(base_url=auth['docker_host'],
tls=tls_config,
version=auth['api_version'],
timeout=auth['timeout'])
if auth['tls_verify'] and auth['cacert_path']:
# TLS with cacert only
tls_config = _get_tls_config(ca_cert=auth['cacert_path'],
assert_hostname=auth['tls_hostname'],
verify=True,
ssl_version=auth['ssl_version'],
fail_function=fail_function)
return dict(base_url=auth['docker_host'],
tls=tls_config,
version=auth['api_version'],
timeout=auth['timeout'])
if auth['tls_verify']:
# TLS with verify and no certs
tls_config = _get_tls_config(verify=True,
assert_hostname=auth['tls_hostname'],
ssl_version=auth['ssl_version'],
fail_function=fail_function)
return dict(base_url=auth['docker_host'],
tls=tls_config,
version=auth['api_version'],
timeout=auth['timeout'])
if auth['tls'] and auth['cert_path'] and auth['key_path']:
# TLS with certs and no host verification
tls_config = _get_tls_config(client_cert=(auth['cert_path'], auth['key_path']),
verify=False,
ssl_version=auth['ssl_version'],
fail_function=fail_function)
return dict(base_url=auth['docker_host'],
tls=tls_config,
version=auth['api_version'],
timeout=auth['timeout'])
if auth['tls']:
# TLS with no certs and not host verification
tls_config = _get_tls_config(verify=False,
ssl_version=auth['ssl_version'],
fail_function=fail_function)
return dict(base_url=auth['docker_host'],
tls=tls_config,
version=auth['api_version'],
timeout=auth['timeout'])
# No TLS
return dict(base_url=auth['docker_host'],
version=auth['api_version'],
timeout=auth['timeout'])
class InventoryModule(BaseInventoryPlugin, Constructable):
''' Host inventory parser for ansible using Docker swarm as source. '''
NAME = 'docker_swarm'
def _fail(self, msg):
raise AnsibleError(msg)
def _populate(self):
raw_params = dict(
docker_host=self.get_option('docker_host'),
tls=self.get_option('tls'),
tls_verify=self.get_option('validate_certs'),
key_path=self.get_option('client_key'),
cacert_path=self.get_option('ca_cert'),
cert_path=self.get_option('client_cert'),
tls_hostname=self.get_option('tls_hostname'),
api_version=self.get_option('api_version'),
timeout=self.get_option('timeout'),
ssl_version=self.get_option('ssl_version'),
debug=None,
)
update_tls_hostname(raw_params)
connect_params = get_connect_params(raw_params, fail_function=self._fail)
self.client = docker.DockerClient(**connect_params)
self.inventory.add_group('all')
self.inventory.add_group('manager')
self.inventory.add_group('worker')
self.inventory.add_group('leader')
self.inventory.add_group('nonleaders')
if self.get_option('include_host_uri'):
if self.get_option('include_host_uri_port'):
host_uri_port = str(self.get_option('include_host_uri_port'))
elif self.get_option('tls') or self.get_option('validate_certs'):
host_uri_port = '2376'
else:
host_uri_port = '2375'
try:
self.nodes = self.client.nodes.list()
for self.node in self.nodes:
self.node_attrs = self.client.nodes.get(self.node.id).attrs
self.inventory.add_host(self.node_attrs['ID'])
self.inventory.add_host(self.node_attrs['ID'], group=self.node_attrs['Spec']['Role'])
self.inventory.set_variable(self.node_attrs['ID'], 'ansible_host',
self.node_attrs['Status']['Addr'])
if self.get_option('include_host_uri'):
self.inventory.set_variable(self.node_attrs['ID'], 'ansible_host_uri',
'tcp://' + self.node_attrs['Status']['Addr'] + ':' + host_uri_port)
if self.get_option('verbose_output'):
self.inventory.set_variable(self.node_attrs['ID'], 'docker_swarm_node_attributes', self.node_attrs)
if 'ManagerStatus' in self.node_attrs:
if self.node_attrs['ManagerStatus'].get('Leader'):
# This is workaround of bug in Docker when in some cases the Leader IP is 0.0.0.0
# Check moby/moby#35437 for details
swarm_leader_ip = parse_address(self.node_attrs['ManagerStatus']['Addr'])[0] or \
self.node_attrs['Status']['Addr']
if self.get_option('include_host_uri'):
self.inventory.set_variable(self.node_attrs['ID'], 'ansible_host_uri',
'tcp://' + swarm_leader_ip + ':' + host_uri_port)
self.inventory.set_variable(self.node_attrs['ID'], 'ansible_host', swarm_leader_ip)
self.inventory.add_host(self.node_attrs['ID'], group='leader')
else:
self.inventory.add_host(self.node_attrs['ID'], group='nonleaders')
else:
self.inventory.add_host(self.node_attrs['ID'], group='nonleaders')
# Use constructed if applicable
strict = self.get_option('strict')
# Composed variables
self._set_composite_vars(self.get_option('compose'),
self.node_attrs,
self.node_attrs['ID'],
strict=strict)
# Complex groups based on jinja2 conditionals, hosts that meet the conditional are added to group
self._add_host_to_composed_groups(self.get_option('groups'),
self.node_attrs,
self.node_attrs['ID'],
strict=strict)
# Create groups based on variable values and add the corresponding hosts to it
self._add_host_to_keyed_groups(self.get_option('keyed_groups'),
self.node_attrs,
self.node_attrs['ID'],
strict=strict)
except Exception as e:
raise AnsibleError('Unable to fetch hosts from Docker swarm API, this was the original exception: %s' %
to_native(e))
def verify_file(self, path):
"""Return the possibly of a file being consumable by this plugin."""
return (
super(InventoryModule, self).verify_file(path) and
path.endswith((self.NAME + '.yaml', self.NAME + '.yml')))
def parse(self, inventory, loader, path, cache=True):
if not HAS_DOCKER:
raise AnsibleError('The Docker swarm dynamic inventory plugin requires the Docker SDK for Python: '
'https://github.com/docker/docker-py.')
super(InventoryModule, self).parse(inventory, loader, path, cache)
self._read_config_data(path)
self._populate()
|