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Adding kubernetes module

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Eric Johnson 2015-11-03 20:49:59 +00:00
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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
This module can mimic the 'kubectl' Kubernetes client for commands
such as 'get', 'cluster-info', and 'version'. This is useful if you
want to fetch full object details for existing Kubernetes resources.
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).
required: true
default: null
file_reference:
description:
- Specify full path to a Kubernets YAML file to send to API I(endpoint).
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
kubectl_api_versions:
description:
- Mimic the 'kubectl api-versions' command, values are ignored.
required: false
default: null
kubectl_cluster_info:
description:
- Mimic the 'kubectl cluster-info' command, values are ignored.
required: false
default: null
kubectl_get:
description:
- Mimic the 'kubectl get' command. Specify the object(s) to fetch such
as 'pods' or 'replicationcontrollers/mycontroller'. It does not
support shortcuts (e.g. 'po', 'rc', 'svc').
required: false
default: null
kubectl_namespace:
description:
- Specify the namespace to use for 'kubectl' commands.
required: false
default: "default"
kubectl_version:
description:
- Mimic the 'kubectl version' command, values are ignored.
required: false
default: null
state:
description:
- The desired action to take on the Kubernetes data, or 'kubectl' to
mimic some kubectl commands.
required: true
default: "present"
choices: ["present", "post", "absent", "delete", "update", "patch",
"replace", "put", "kubectl"]
url_password:
description:
- The HTTP Basic Auth password for the API I(endpoint).
required: true
default: null
aliases: ["password", "api_password"]
url_username:
description:
- The HTTP Basic Auth username for the API I(endpoint).
required: true
default: "admin"
aliases: ["username", "api_username"]
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
choices: BOOLEANS
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
url_username: admin
url_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
url_username: admin
url_password: redacted
file_reference: /path/to/create_namespace.yaml
state: present
# Fetch info about the Kubernets cluster with a fake 'kubectl' command.
- name: Look up cluster info
kubernetes:
api_endpoint: 123.45.67.89
url_username: admin
url_password: redacted
kubectl_cluster_info: 1
state: kubectl
# Fetch info about the Kubernets pods with a fake 'kubectl' command.
- name: Look up pods
kubernetes:
api_endpoint: 123.45.67.89
url_username: admin
url_password: redacted
kubectl_get: pods
state: kubectl
'''
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 response is not None:
body = json.loads(response.read())
return info, body
def k8s_kubectl_get(module, url):
req = module.params.get("kubectl_get")
info, body = api_request(module, url + "/" + req)
return False, body
def k8s_delete_resource(module, url, data):
name = None
if 'metadata' in data:
name = data['metadata'].get('name')
if name is None:
module.fail_json(msg="Missing a named resource in object metadata")
url = url + '/' + name
info, body = api_request(module, url, method="DELETE")
if info['status'] == 404:
return False, {}
if info['status'] == 200:
return True, body
module.fail_json(msg="%s: fetching URL '%s'" % (info['msg'], url))
def k8s_create_resource(module, url, data):
info, body = api_request(module, url, method="POST", data=data)
if info['status'] == 409:
name = data["metadata"].get("name", None)
info, body = api_request(module, url + "/" + name)
return False, body
return True, body
def k8s_replace_resource(module, url, data):
name = None
if 'metadata' in data:
name = data['metadata'].get('name')
if name is None:
module.fail_json(msg="Missing a named resource in object metadata")
url = url + '/' + name
info, body = api_request(module, url, method="PUT", data=data)
if info['status'] == 409:
name = data["metadata"].get("name", None)
info, body = api_request(module, url + "/" + name)
return False, body
return True, body
def k8s_update_resource(module, url, data):
name = None
if 'metadata' in data:
name = data['metadata'].get('name')
if name is None:
module.fail_json(msg="Missing a named resource in object metadata")
url = url + '/' + name
headers = {"Content-Type": "application/strategic-merge-patch+json"}
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
return True, body
def main():
module = AnsibleModule(
argument_spec=dict(
http_agent=dict(default=USER_AGENT),
url_username=dict(default="admin"),
url_password=dict(required=True, no_log=True),
force_basic_auth=dict(default="yes"),
validate_certs=dict(default=False, choices=BOOLEANS),
certificate_authority_data=dict(required=False),
# fake 'kubectl' commands
kubectl_api_versions=dict(required=False),
kubectl_cluster_info=dict(required=False),
kubectl_get=dict(required=False),
kubectl_namespace=dict(required=False, default="default"),
kubectl_version=dict(required=False),
# k8s API module variables
api_endpoint=dict(required=True),
file_reference=dict(required=False),
inline_data=dict(required=False),
state=dict(default="present",
choices=["present", "post",
"absent", "delete",
"update", "put",
"replace", "patch",
"kubectl"])
)
)
decode_cert_data(module)
changed = False
data = module.params.get('inline_data', {})
if not data:
dfile = module.params.get('file_reference')
if dfile:
f = open(dfile, "r")
data = yaml.load(f)
endpoint = "https://" + module.params.get('api_endpoint')
url = endpoint
namespace = "default"
if data and 'metadata' in data:
namespace = data['metadata'].get('namespace', "default")
kind = data['kind'].lower()
url = endpoint + KIND_URL[kind]
url = url.replace("{namespace}", namespace)
# check for 'kubectl' commands
kubectl_api_versions = module.params.get('kubectl_api_versions')
kubectl_cluster_info = module.params.get('kubectl_cluster_info')
kubectl_get = module.params.get('kubectl_get')
kubectl_namespace = module.params.get('kubectl_namespace')
kubectl_version = module.params.get('kubectl_version')
state = module.params.get('state')
if state in ['present', 'post']:
changed, body = k8s_create_resource(module, url, data)
module.exit_json(changed=changed, api_response=body)
if state in ['absent', 'delete']:
changed, body = k8s_delete_resource(module, url, data)
module.exit_json(changed=changed, api_response=body)
if state in ['replace', 'put']:
changed, body = k8s_replace_resource(module, url, data)
module.exit_json(changed=changed, api_response=body)
if state in ['update', 'patch']:
changed, body = k8s_update_resource(module, url, data)
module.exit_json(changed=changed, api_response=body)
if state == 'kubectl':
kurl = url + "/api/v1/namespaces/" + kubectl_namespace
if kubectl_get:
if kubectl_get.startswith("namespaces"):
kurl = url + "/api/v1"
changed, body = k8s_kubectl_get(module, kurl)
module.exit_json(changed=changed, api_response=body)
if kubectl_version:
info, body = api_request(module, url + "/version")
module.exit_json(changed=False, api_response=body)
if kubectl_api_versions:
info, body = api_request(module, url + "/api")
module.exit_json(changed=False, api_response=body)
if kubectl_cluster_info:
info, body = api_request(module, url +
"/api/v1/namespaces/kube-system"
"/services?labelSelector=kubernetes"
".io/cluster-service=true")
module.exit_json(changed=False, api_response=body)
module.fail_json(msg="Invalid state: '%s'" % state)
# import module snippets
from ansible.module_utils.basic import * # NOQA
from ansible.module_utils.urls import * # NOQA
if __name__ == '__main__':
main()