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ansible/clustering/kubernetes.py
James Cammarata 393e43b876 Fixing/cleaning up kubernetes submission 
1) Removed kubectl functionality. We'll move that into a different
   module in the future. Also removed post/put/patch/delete options,
   as they are not Ansible best practice.
2) Expanded error handling in areas where tracebacks were most likely,
   based on bad data from users, etc.
3) Added an 'insecure' option and made the password param optional, to
   enable the use of the local insecure port.
4) Allowed the data (both inline and from the file) to support multiple
   items via a list. This is common in YAML files where mutliple docs
   are used to create/remove multiple resources in one shot.
5) General bug fixing.
2016-04-14 16:43:59 -04:00

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#!/usr/bin/python
# Copyright 2015 Google Inc. All Rights Reserved.
#
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible. If not, see <http://www.gnu.org/licenses/>
DOCUMENTATION = '''
---
module: kubernetes
version_added: "2.1"
short_description: Manage Kubernetes resources.
description:
- This module can manage Kubernetes resources on an existing cluster using
the Kubernetes server API. Users can specify in-line API data, or
specify an existing Kubernetes YAML file. Currently, this module,
Only supports HTTP Basic Auth
Only supports 'strategic merge' for update, http://goo.gl/fCPYxT
SSL certs are not working, use 'validate_certs=off' to disable
options:
api_endpoint:
description:
- The IPv4 API endpoint of the Kubernetes cluster.
required: true
default: null
aliases: ["endpoint"]
inline_data:
description:
- The Kubernetes YAML data to send to the API I(endpoint). This option is
mutually exclusive with C('file_reference').
required: true
default: null
file_reference:
description:
- Specify full path to a Kubernets YAML file to send to API I(endpoint).
This option is mutually exclusive with C('inline_data').
required: false
default: null
certificate_authority_data:
description:
- Certificate Authority data for Kubernetes server. Should be in either
standard PEM format or base64 encoded PEM data. Note that certificate
verification is broken until ansible supports a version of
'match_hostname' that can match the IP address against the CA data.
required: false
default: null
state:
description:
- The desired action to take on the Kubernetes data.
required: true
default: "present"
choices: ["present", "absent", "update", "replace"]
password:
description:
- The HTTP Basic Auth password for the API I(endpoint). This should be set
unless using the C('insecure') option.
default: null
username:
description:
- The HTTP Basic Auth username for the API I(endpoint). This should be set
unless using the C('insecure') option.
default: "admin"
insecure:
description:
- "Reverts the connection to using HTTP instead of HTTPS. This option should
only be used when execuing the M('kubernetes') module local to the Kubernetes
cluster using the insecure local port (locahost:8080 by default)."
validate_certs:
description:
- Enable/disable certificate validation. Note that this is set to
C(false) until Ansible can support IP address based certificate
hostname matching (exists in >= python3.5.0).
required: false
default: false
author: "Eric Johnson (@erjohnso) <erjohnso@google.com>"
'''
EXAMPLES = '''
# Create a new namespace with in-line YAML.
- name: Create a kubernetes namespace
kubernetes:
api_endpoint: 123.45.67.89
username: admin
password: redacted
inline_data:
kind: Namespace
apiVersion: v1
metadata:
name: ansible-test
labels:
label_env: production
label_ver: latest
annotations:
a1: value1
a2: value2
state: present
# Create a new namespace from a YAML file.
- name: Create a kubernetes namespace
kubernetes:
api_endpoint: 123.45.67.89
username: admin
password: redacted
file_reference: /path/to/create_namespace.yaml
state: present
# Do the same thing, but using the insecure localhost port
- name: Create a kubernetes namespace
kubernetes:
api_endpoint: 123.45.67.89
insecure: true
file_reference: /path/to/create_namespace.yaml
state: present
'''
RETURN = '''
# Example response from creating a Kubernetes Namespace.
api_response:
description: Raw response from Kubernetes API, content varies with API.
returned: success
type: dictionary
contains:
apiVersion: "v1"
kind: "Namespace"
metadata:
creationTimestamp: "2016-01-04T21:16:32Z"
name: "test-namespace"
resourceVersion: "509635"
selfLink: "/api/v1/namespaces/test-namespace"
uid: "6dbd394e-b328-11e5-9a02-42010af0013a"
spec:
finalizers:
- kubernetes
status:
phase: "Active"
'''
import yaml
import base64
############################################################################
############################################################################
# For API coverage, this Anislbe module provides capability to operate on
# all Kubernetes objects that support a "create" call (except for 'Events').
# In order to obtain a valid list of Kubernetes objects, the v1 spec file
# was referenced and the below python script was used to parse the JSON
# spec file, extract only the objects with a description starting with
# 'create a'. The script then iterates over all of these base objects
# to get the endpoint URL and was used to generate the KIND_URL map.
#
# import json
# from urllib2 import urlopen
#
# r = urlopen("https://raw.githubusercontent.com/kubernetes"
# "/kubernetes/master/api/swagger-spec/v1.json")
# v1 = json.load(r)
#
# apis = {}
# for a in v1['apis']:
# p = a['path']
# for o in a['operations']:
# if o["summary"].startswith("create a") and o["type"] != "v1.Event":
# apis[o["type"]] = p
#
# def print_kind_url_map():
# results = []
# for a in apis.keys():
# results.append('"%s": "%s"' % (a[3:].lower(), apis[a]))
# results.sort()
# print "KIND_URL = {"
# print ",\n".join(results)
# print "}"
#
# if __name__ == '__main__':
# print_kind_url_map()
############################################################################
############################################################################
KIND_URL = {
"binding": "/api/v1/namespaces/{namespace}/bindings",
"endpoints": "/api/v1/namespaces/{namespace}/endpoints",
"limitrange": "/api/v1/namespaces/{namespace}/limitranges",
"namespace": "/api/v1/namespaces",
"node": "/api/v1/nodes",
"persistentvolume": "/api/v1/persistentvolumes",
"persistentvolumeclaim": "/api/v1/namespaces/{namespace}/persistentvolumeclaims", # NOQA
"pod": "/api/v1/namespaces/{namespace}/pods",
"podtemplate": "/api/v1/namespaces/{namespace}/podtemplates",
"replicationcontroller": "/api/v1/namespaces/{namespace}/replicationcontrollers", # NOQA
"resourcequota": "/api/v1/namespaces/{namespace}/resourcequotas",
"secret": "/api/v1/namespaces/{namespace}/secrets",
"service": "/api/v1/namespaces/{namespace}/services",
"serviceaccount": "/api/v1/namespaces/{namespace}/serviceaccounts"
}
USER_AGENT = "ansible-k8s-module/0.0.1"
# TODO(erjohnso): SSL Certificate validation is currently unsupported.
# It can be made to work when the following are true:
# - Ansible consistently uses a "match_hostname" that supports IP Address
# matching. This is now true in >= python3.5.0. Currently, this feature
# is not yet available in backports.ssl_match_hostname (still 3.4).
# - Ansible allows passing in the self-signed CA cert that is created with
# a kubernetes master. The lib/ansible/module_utils/urls.py method,
# SSLValidationHandler.get_ca_certs() needs a way for the Kubernetes
# CA cert to be passed in and included in the generated bundle file.
# When this is fixed, the following changes can be made to this module,
# - Remove the 'return' statement in line 254 below
# - Set 'required=true' for certificate_authority_data and ensure that
# ansible's SSLValidationHandler.get_ca_certs() can pick up this CA cert
# - Set 'required=true' for the validate_certs param.
def decode_cert_data(module):
return
d = module.params.get("certificate_authority_data")
if d and not d.startswith("-----BEGIN"):
module.params["certificate_authority_data"] = base64.b64decode(d)
def api_request(module, url, method="GET", headers=None, data=None):
body = None
if data:
data = json.dumps(data)
response, info = fetch_url(module, url, method=method, headers=headers, data=data)
if int(info['status']) == -1:
module.fail_json(msg="Failed to execute the API request: %s" % info['msg'], url=url, method=method, headers=headers)
if response is not None:
body = json.loads(response.read())
return info, body
def k8s_create_resource(module, url, data):
info, body = api_request(module, url, method="POST", data=data, headers={"Content-Type": "application/json"})
if info['status'] == 409:
name = data["metadata"].get("name", None)
info, body = api_request(module, url + "/" + name)
return False, body
elif info['status'] >= 400:
module.fail_json(msg="failed to create the resource: %s" % info['msg'], url=url)
return True, body
def k8s_delete_resource(module, url, data):
name = data.get('metadata', {}).get('name')
if name is None:
module.fail_json(msg="Missing a named resource in object metadata when trying to remove a resource")
url = url + '/' + name
info, body = api_request(module, url, method="DELETE")
if info['status'] == 404:
return False, "Resource name '%s' already absent" % name
elif info['status'] >= 400:
module.fail_json(msg="failed to delete the resource '%s': %s" % (name, info['msg']), url=url)
return True, "Successfully deleted resource name '%s'" % name
def k8s_replace_resource(module, url, data):
name = data.get('metadata', {}).get('name')
if name is None:
module.fail_json(msg="Missing a named resource in object metadata when trying to replace a resource")
headers = {"Content-Type": "application/json"}
url = url + '/' + name
info, body = api_request(module, url, method="PUT", data=data, headers=headers)
if info['status'] == 409:
name = data["metadata"].get("name", None)
info, body = api_request(module, url + "/" + name)
return False, body
elif info['status'] >= 400:
module.fail_json(msg="failed to replace the resource '%s': %s" % (name, info['msg']), url=url)
return True, body
def k8s_update_resource(module, url, data):
name = data.get('metadata', {}).get('name')
if name is None:
module.fail_json(msg="Missing a named resource in object metadata when trying to update a resource")
headers = {"Content-Type": "application/strategic-merge-patch+json"}
url = url + '/' + name
info, body = api_request(module, url, method="PATCH", data=data, headers=headers)
if info['status'] == 409:
name = data["metadata"].get("name", None)
info, body = api_request(module, url + "/" + name)
return False, body
elif info['status'] >= 400:
module.fail_json(msg="failed to update the resource '%s': %s" % (name, info['msg']), url=url)
return True, body
def main():
module = AnsibleModule(
argument_spec=dict(
http_agent=dict(default=USER_AGENT),
username=dict(default="admin"),
password=dict(default="", no_log=True),
force_basic_auth=dict(default="yes"),
validate_certs=dict(default=False, type='bool'),
certificate_authority_data=dict(required=False),
insecure=dict(default=False, type='bool'),
api_endpoint=dict(required=True),
file_reference=dict(required=False),
inline_data=dict(required=False),
state=dict(default="present", choices=["present", "absent", "update", "replace"])
),
mutually_exclusive = (('file_reference', 'inline_data'), ('username', 'insecure'), ('password', 'insecure')),
required_one_of = (('file_reference', 'inline_data'),),
)
decode_cert_data(module)
api_endpoint = module.params.get('api_endpoint')
state = module.params.get('state')
insecure = module.params.get('insecure')
inline_data = module.params.get('inline_data')
file_reference = module.params.get('file_reference')
if inline_data:
data = inline_data
else:
try:
f = open(file_reference, "r")
data = [x for x in yaml.load_all(f)]
f.close()
if not data:
module.fail_json(msg="No valid data could be found.")
except:
module.fail_json(msg="The file '%s' was not found or contained invalid YAML/JSON data" % file_reference)
# set the transport type and build the target endpoint url
transport = 'https'
if insecure:
transport = 'http'
target_endpoint = "%s://%s" % (transport, api_endpoint)
body = []
changed = False
# make sure the data is a list
if not isinstance(data, list):
data = [ data ]
for item in data:
namespace = "default"
if item and 'metadata' in item:
namespace = item.get('metadata', {}).get('namespace', "default")
kind = item.get('kind', '').lower()
try:
url = target_endpoint + KIND_URL[kind]
except KeyError:
module.fail_json("invalid resource kind specified in the data: '%s'" % kind)
url = url.replace("{namespace}", namespace)
else:
url = target_endpoint
if state == 'present':
item_changed, item_body = k8s_create_resource(module, url, item)
elif state == 'absent':
item_changed, item_body = k8s_delete_resource(module, url, item)
elif state == 'replace':
item_changed, item_body = k8s_replace_resource(module, url, item)
elif state == 'update':
item_changed, item_body = k8s_update_resource(module, url, item)
changed |= item_changed
body.append(item_body)
module.exit_json(changed=changed, api_response=body)
# import module snippets
from ansible.module_utils.basic import * # NOQA
from ansible.module_utils.urls import * # NOQA
if __name__ == '__main__':
main()
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