├── Dockerfile ├── LICENSE ├── README.md ├── generic_api.py ├── ghost ├── ghost-1.yaml ├── ghost-2.yaml ├── ghost-thirdparty.yaml └── manifests │ ├── 0-namespace.yaml │ ├── configmap.yaml │ ├── deployment.yaml │ ├── ingress.yaml │ └── service.yaml └── opy.py /Dockerfile: -------------------------------------------------------------------------------- 1 | FROM python:3.6-alpine 2 | 3 | RUN pip install \ 4 | "kubernetes==1.0.0b1" \ 5 | "jinja2~=2.9.5" \ 6 | "pyyaml~=3.12" \ 7 | "click~=6.7" 8 | 9 | WORKDIR /usr/src/app 10 | COPY . /usr/src/app 11 | 12 | CMD ["python", "./opy.py"] 13 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright {yyyy} {name of copyright owner} 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Kubernetes Operator 2 | 3 | Experimantal example written in Python. Work in progress. Improve me if you like :) 4 | 5 | 6 | Some commands to test: 7 | 8 | ```bash 9 | docker build --tag local/opy . 10 | 11 | context="my-kubectl-config-context" 12 | 13 | 14 | kubectl --context $context apply --filename ./ghost/ghost-thirdparty.yaml 15 | 16 | docker run -v $HOME/.kube:/root/.kube -t local/opy python opy.py \ 17 | --context $context \ 18 | --api-version experimantal.giantswarm.com/v1 \ 19 | --kind Ghost 20 | 21 | kubectl --context $context create --filename ./ghost/ghost-1.yaml 22 | 23 | kubectl --context $context create --filename ./ghost/ghost-2.yaml 24 | 25 | kubectl --context $context get --all-namespaces ghosts 26 | 27 | 28 | kubectl --context $context get --all-namespaces ingress -o wide 29 | 30 | kubectl --context $context run -ti --rm tiny-tools --image giantswarm/tiny-tools curl ghost-1.ghost-test-1.svc:2368 31 | 32 | 33 | kubectl --context $context --namespace ghost-test-1 delete ghost ghost-1 34 | 35 | kubectl --context $context --namespace ghost-another-test delete ghost ghost-2 36 | 37 | kubectl --context $context delete thirdpartyresource ghost.experimantal.giantswarm.com 38 | 39 | kubectl --context $context delete namespace --now ghost-test-1 40 | 41 | kubectl --context $context delete namespace --now ghost-another-test 42 | 43 | kubectl --context $context get namespaces 44 | 45 | ``` 46 | -------------------------------------------------------------------------------- /generic_api.py: -------------------------------------------------------------------------------- 1 | from __future__ import absolute_import 2 | import sys 3 | import os 4 | import re 5 | 6 | # python 2 and python 3 compatibility library 7 | from six import iteritems 8 | 9 | from kubernetes.client.configuration import Configuration 10 | from kubernetes.client.api_client import ApiClient 11 | 12 | 13 | class GenericApi(object): 14 | 15 | def __init__(self, api_client=None): 16 | config = Configuration() 17 | if api_client: 18 | self.api_client = api_client 19 | else: 20 | if not config.api_client: 21 | config.api_client = ApiClient() 22 | self.api_client = config.api_client 23 | 24 | def list_generic(self, **kwargs): 25 | # print(kwargs) 26 | kwargs['_return_http_data_only'] = True 27 | if kwargs.get('callback'): 28 | return self._list_generic(**kwargs) 29 | else: 30 | (data) = self._list_generic(**kwargs) 31 | print(data) 32 | return data 33 | 34 | def _list_generic(self, **kwargs): 35 | resource_path = kwargs.pop('resource_path') 36 | kwargs['header_params'] = { 37 | 'Accept': self.api_client.select_header_accept(['application/json', 'application/json;stream=watch']), 38 | 'Content-Type': self.api_client.select_header_content_type(['*/*']) 39 | } 40 | kwargs['auth_settings'] = ['BearerToken'] 41 | kwargs['response_type'] = object 42 | if 'query_params' not in kwargs: 43 | kwargs['query_params'] = {} 44 | if 'timeout_seconds' in kwargs: 45 | kwargs['query_params']['timeoutSeconds'] = kwargs.pop('timeout_seconds') 46 | if 'watch' in kwargs: 47 | kwargs['query_params']['watch'] = kwargs.pop('watch') 48 | return self.api_client.call_api(resource_path, 'GET', **kwargs) 49 | 50 | def call_api(self, resource_path, method, **kwargs): 51 | kwargs['response_type'] = object 52 | return self.api_client.call_api(resource_path, method, **kwargs) 53 | -------------------------------------------------------------------------------- /ghost/ghost-1.yaml: -------------------------------------------------------------------------------- 1 | apiVersion: experimantal.giantswarm.com/v1 2 | kind: Ghost 3 | metadata: 4 | name: ghost-1 5 | namespace: ghost-test-1 6 | spec: 7 | url: "ghost-1.kube.thisone.rocks" 8 | mail: 9 | from: '"Custom Name" ' 10 | service: 11 | type: Sparkpost 12 | auth: 13 | user: SMTP_Injection 14 | pass: 15 | database: 16 | client: sqlite3 17 | -------------------------------------------------------------------------------- /ghost/ghost-2.yaml: -------------------------------------------------------------------------------- 1 | apiVersion: experimantal.giantswarm.com/v1 2 | kind: Ghost 3 | metadata: 4 | name: ghost-2 5 | namespace: ghost-another-test 6 | spec: 7 | # url: "ghost-2.some.other.url" 8 | mail: 9 | from: '"Custom Name" ' 10 | service: 11 | type: Sparkpost 12 | auth: 13 | user: SMTP_Injection 14 | pass: 15 | database: 16 | client: sqlite3 17 | -------------------------------------------------------------------------------- /ghost/ghost-thirdparty.yaml: -------------------------------------------------------------------------------- 1 | apiVersion: extensions/v1beta1 2 | kind: ThirdPartyResource 3 | description: "An operator to manage Ghost deployments." 4 | metadata: 5 | name: "ghost.experimantal.giantswarm.com" 6 | versions: 7 | - name: v1 8 | -------------------------------------------------------------------------------- /ghost/manifests/0-namespace.yaml: -------------------------------------------------------------------------------- 1 | apiVersion: v1 2 | kind: Namespace 3 | metadata: 4 | name: {{ metadata.namespace }} 5 | -------------------------------------------------------------------------------- /ghost/manifests/configmap.yaml: -------------------------------------------------------------------------------- 1 | apiVersion: v1 2 | kind: ConfigMap 3 | metadata: 4 | name: {{ metadata.name }} 5 | namespace: {{ metadata.namespace }} 6 | labels: 7 | app: {{ metadata.name }} 8 | thirdparty: ghost 9 | data: 10 | config.example.js: | 11 | var path = require('path'), 12 | config; 13 | 14 | config = { 15 | production: { 16 | url: '{{ spec.url }}', 17 | mail: { 18 | transport: 'SMTP', 19 | options: { 20 | service: '{{ spec.mail.service.type }}', 21 | auth: { 22 | user: '{{ spec.mail.service.auth.user }}', 23 | pass: '{{ spec.mail.service.auth.pass }}' 24 | } 25 | } 26 | }, 27 | database: { 28 | # if mariadb, sqlite3, .. 29 | client: 'sqlite3', 30 | connection: { 31 | filename: path.join(__dirname, '/content/data/ghost.db') 32 | }, 33 | debug: false 34 | }, 35 | server: { 36 | host: '0.0.0.0', 37 | port: '2368' 38 | } 39 | } 40 | }; 41 | 42 | module.exports = config; 43 | -------------------------------------------------------------------------------- /ghost/manifests/deployment.yaml: -------------------------------------------------------------------------------- 1 | apiVersion: extensions/v1beta1 2 | kind: Deployment 3 | metadata: 4 | name: {{ metadata.name }} 5 | namespace: {{ metadata.namespace }} 6 | labels: 7 | app: {{ metadata.name }} 8 | thirdparty: ghost 9 | spec: 10 | replicas: 1 11 | template: 12 | metadata: 13 | labels: 14 | app: {{ metadata.name }} 15 | thirdparty: ghost 16 | spec: 17 | containers: 18 | - name: {{ metadata.name }} 19 | # image: bitnami/ghost 20 | image: ghost:0.11.3 21 | imagePullPolicy: IfNotPresent 22 | # env: 23 | # - name: MARIADB_HOST 24 | # value: mariadb 25 | # - name: MARIADB_PORT 26 | # value: "3306" 27 | # - name: MARIADB_PASSWORD 28 | # value: ghost 29 | # # valueFrom: 30 | # # secretKeyRef: 31 | # - name: GHOST_HOST 32 | # value: {{ host }} 33 | # # - name: GHOST_PORT 34 | # - name: GHOST_USERNAME 35 | # value: admin 36 | # - name: GHOST_PASSWORD 37 | # value: password 38 | # # valueFrom: 39 | # # secretKeyRef: 40 | # # name: 41 | # # key: ghost-password 42 | ports: 43 | - name: http 44 | containerPort: 2368 45 | livenessProbe: 46 | httpGet: 47 | path: / 48 | port: http 49 | initialDelaySeconds: 120 50 | timeoutSeconds: 5 51 | # readinessProbe: 52 | # exec: 53 | # command: 54 | # - sh 55 | # - -c 56 | # - nami status ghost | grep "ghost is running" 57 | # initialDelaySeconds: 5 58 | # timeoutSeconds: 1 59 | # resources: 60 | # volumeMounts: 61 | # - name: ghost-data 62 | # mountPath: /bitnami/ghost 63 | # volumes: 64 | # - name: ghost-data 65 | # emptyDir: {} 66 | 67 | # - name: config 68 | # configmap > /etc/ghost 69 | 70 | # /var/lib/ghost/content for content? 71 | # apps, data, images and themes 72 | # ^needed, maybe init-container 73 | -------------------------------------------------------------------------------- /ghost/manifests/ingress.yaml: -------------------------------------------------------------------------------- 1 | apiVersion: extensions/v1beta1 2 | kind: Ingress 3 | metadata: 4 | name: {{ metadata.name }} 5 | namespace: {{ metadata.namespace }} 6 | labels: 7 | app: {{ metadata.name }} 8 | thirdparty: Ghost 9 | # annotations: 10 | # kubernetes.io/tls-acme: "true" 11 | spec: 12 | # rules: 13 | # - host: {{ spec.url }} 14 | # http: 15 | # paths: 16 | # - path: / 17 | # backend: 18 | # serviceName: {{ metadata.name }} 19 | # servicePort: 2368 20 | # tls: 21 | # - secretName: {{ metadata.name }}-tls 22 | # hosts: 23 | # - {{ spec.url }} 24 | 25 | backend: 26 | serviceName: {{ metadata.name }} 27 | servicePort: 2368 28 | -------------------------------------------------------------------------------- /ghost/manifests/service.yaml: -------------------------------------------------------------------------------- 1 | apiVersion: v1 2 | kind: Service 3 | metadata: 4 | name: {{ metadata.name }} 5 | namespace: {{ metadata.namespace }} 6 | labels: 7 | app: {{ metadata.name }} 8 | thirdparty: Ghost 9 | spec: 10 | ports: 11 | - name: http 12 | port: 2368 13 | protocol: TCP 14 | targetPort: http 15 | selector: 16 | app: {{ metadata.name }} 17 | thirdparty: ghost 18 | -------------------------------------------------------------------------------- /opy.py: -------------------------------------------------------------------------------- 1 | import kubernetes 2 | import json, os, yaml 3 | from jinja2 import Environment, FileSystemLoader, Template 4 | from pathlib import Path 5 | from functools import lru_cache 6 | import itertools 7 | import click 8 | from generic_api import GenericApi 9 | 10 | 11 | # FIXME 12 | # use revision of `Ghost` manifest as label for all derived templates 13 | # or created_at or something. 14 | # to be able to identify orphans. 15 | 16 | class Operator(object): 17 | 18 | def __init__(self, context): 19 | # kubernetes.config.load_kube_config(context="thisone") 20 | kubernetes.config.load_kube_config(context=context) 21 | 22 | # FIXME does not pick up config changes after initialized 23 | self.generic = GenericApi() 24 | 25 | # FIXME use ttl_cache instead 26 | @lru_cache(maxsize=128) 27 | def lookup_resource(self, api_version, kind): 28 | api_prefix = "api" if api_version == "v1" else "apis" 29 | resources = self.generic.call_api(f"/{api_prefix}/{api_version}", "GET")[0]["resources"] 30 | for resource in resources: 31 | if resource["kind"]==kind and "/" not in resource["name"]: 32 | return resource 33 | 34 | def build_url(self, api_version, kind, namespace=None): 35 | resource = self.lookup_resource(api_version, kind) 36 | if not resource: 37 | print("ERR", api_version, kind) 38 | exit 39 | 40 | api_prefix = "api" if api_version == "v1" else "apis" 41 | if resource["namespaced"] and namespace: 42 | # if not namespace: 43 | # namespace = "default" 44 | return f"/{api_prefix}/{api_version}/namespaces/{namespace}/{resource['name']}" 45 | 46 | return f"/{api_prefix}/{api_version}/{resource['name']}" 47 | 48 | 49 | # FIXME api/kind to watch as config-parameter 50 | 51 | # maybe base_path + rel? 52 | def apply_templates(self, path, values): 53 | env = Environment(loader=FileSystemLoader(os.fspath(path))) 54 | 55 | for item in sorted(path.iterdir()): 56 | if not item.is_file(): 57 | continue 58 | # print(item) # FIXME log 59 | 60 | rel_path = os.path.relpath(item, start=path) 61 | template = env.get_template(rel_path) 62 | manifest = yaml.load(template.render(values)) 63 | # print(manifest) 64 | # print(values) 65 | 66 | api_version = manifest['apiVersion'] 67 | kind = manifest['kind'] 68 | namespace = manifest['metadata'].get('namespace') 69 | url = self.build_url(api_version, kind, namespace) 70 | #^ or: build_url_for_manifest 71 | 72 | # FIXME check for changes in manifest and take care to re-apply 73 | # and restart pods if necessary 74 | print(f"POST {url}") # FIXME log 75 | 76 | try: 77 | result = self.generic.call_api(url, "POST", body=manifest) 78 | print(f"result: ", result) 79 | except kubernetes.client.rest.ApiException as e: 80 | print(f"! kubernetes.client.rest.ApiException: {e}") 81 | 82 | 83 | def delete_thirdparty(self, thirdparty): 84 | # FIXME add selectors 85 | namespace = thirdparty['metadata'].get('namespace') 86 | name = thirdparty['metadata']['name'] 87 | thirdparty_kind = thirdparty["kind"] 88 | 89 | # patch Deployment 90 | url = self.build_url("extensions/v1beta1", "Deployment", namespace) + f"/{name}" 91 | print(f"PATCH {url}") 92 | 93 | body = {"spec":{"revisionHistoryLimit":0, "paused": True}} 94 | headers = {"Content-Type":"application/strategic-merge-patch+json"} 95 | result = self.generic.call_api(url, "PATCH", body=body, header_params=headers) 96 | 97 | # delete 98 | kinds = [ 99 | ("extensions/v1beta1", "Deployment"), 100 | ("extensions/v1beta1", "ReplicaSet"), 101 | ("v1", "Pod"), 102 | ("v1", "ConfigMap"), 103 | ("v1", "Service"), 104 | ("extensions/v1beta1", "Ingress") 105 | ] 106 | 107 | for api_version, kind in kinds: 108 | url = self.build_url(api_version, kind, namespace) + f"?labelSelector=app={name},thirdparty={thirdparty_kind}" 109 | print(f"DELETE {url}") 110 | try: 111 | self.generic.call_api(url, "DELETE") 112 | except kubernetes.client.rest.ApiException as e: 113 | if e.status in [405]: 114 | print(e.reason) 115 | url = self.build_url(api_version, kind, namespace) + f"/{name}" 116 | print(f"DELETE {url}") 117 | self.generic.call_api(url, "DELETE") 118 | else: 119 | print(f"[EXCEPTION] kubernetes.client.rest.ApiException") 120 | print(f"status: {e.status}\nreason: {e.reason}\nbody: {e.body}\nheaders: {e.headers}") 121 | 122 | 123 | def watch_thirdparty(self, api_version, kind, namespace ): 124 | # self.lookup_resource(api_version, kind) 125 | self.lookup_resource("experimantal.giantswarm.com/v1", "Ghost") 126 | #^ if missing? wait loop? watcher? exit? 127 | 128 | # FIXME build_url to watch 129 | url = self.build_url(api_version, kind, namespace) 130 | print(f"url: {url}") 131 | watch = kubernetes.watch.Watch(return_type=object) 132 | for event in watch.stream(self.generic.list_generic, resource_path=url, timeout_seconds=90000): 133 | # resource_path=f"/apis/experimantal.giantswarm.com/v1/ghosts", timeout_seconds=90000): 134 | 135 | # print(f"event: {json.dumps(event, indent=2)}") 136 | 137 | if event['type'] == "ADDED" and event['object']['kind'] == kind: 138 | self.apply_templates( 139 | path=Path() / kind.lower() / "manifests", 140 | values=event['object']) 141 | 142 | # FIXME check regularly for absent `ghost`s 143 | # and compare to selectors. in case delete event is missed 144 | # 145 | # or: just cleanup orphans 146 | # 147 | elif event['type'] == "DELETED" and event['object']['kind'] == kind: 148 | # print(f"DELETE") 149 | # print(f"event: {json.dumps(event, indent=2)}") 150 | self.delete_thirdparty(event['object']) 151 | 152 | else: 153 | print(f"event: {json.dumps(event, indent=2)}") 154 | 155 | 156 | @click.command() 157 | @click.option('--context', help='kubectl context to use.') 158 | @click.option('--api-version', help='Thirdparty api-version to watch.') 159 | @click.option('--kind', help='Thirdparty kind to watch.') 160 | @click.option('--namespace', default=None, help='Namespace to watch. Use None for All') 161 | 162 | def click(context, api_version, kind, namespace): 163 | operator = Operator(context) 164 | operator.watch_thirdparty(api_version, kind, namespace) 165 | 166 | 167 | if __name__ == '__main__': 168 | click() 169 | --------------------------------------------------------------------------------