Merge pull request #684 from ndeloof/build-sample

Demonstrate docker app build using dockercoins sample app

Author: silvin-lubecki

examples/dockercoins/LICENSE

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+Copyright 2015 Jérôme Petazzoni
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.

examples/dockercoins/README.md

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+# dockercoins
+
+This is the demo application originally used in Jérôme Petazzoni's [orchestration workshop](https://github.com/jpetazzo/container.training).
+
+[Kubernetes Hands-on Workshop](https://training.play-with-kubernetes.com/kubernetes-workshop/)
+```
+rng = web service generating random bytes
+hasher = web service computing hash of POSTed data
+worker = background process using rng and hasher
+webui = web interface to watch progress
+```

examples/dockercoins/coins.dockerapp/docker-compose.yml

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+version: "3.7"
+
+services:
+  rng:
+    build: rng
+    ports:
+      - "${rng.port}:80"
+
+  hasher:
+    build: hasher
+    ports:
+      - "${hasher.port}:80"
+
+  webui:
+    build: webui
+    ports:
+      - "${webui.port}:80"
+
+  redis:
+    image: redis
+
+  worker:
+    build: worker
+

examples/dockercoins/coins.dockerapp/metadata.yml

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+# Version of the application
+version: 0.1.0
+# Name of the application
+name: coins
+# A short description of the application
+description: 
+# List of application maintainers with name and email for each
+maintainers:
+  - name: Jérôme Petazzoni

examples/dockercoins/coins.dockerapp/parameters.yml

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+webui:
+  port: 8000
+rng:
+  port: 8001
+hasher:
+  port: 8002

examples/dockercoins/hasher/Dockerfile

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+FROM ruby:alpine
+RUN apk add --update build-base curl
+RUN gem install sinatra
+RUN gem install thin
+ADD hasher.rb /
+CMD ["ruby", "hasher.rb"]
+EXPOSE 80
+HEALTHCHECK \
+  --interval=1s --timeout=2s --retries=3 --start-period=1s \
+  CMD curl http://localhost/ || exit 1

examples/dockercoins/hasher/hasher.rb

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+require 'digest'
+require 'sinatra'
+require 'socket'
+
+set :bind, '0.0.0.0'
+set :port, 80
+
+post '/' do
+    # Simulate a bit of delay
+    sleep 0.1
+    content_type 'text/plain'
+    "#{Digest::SHA2.new().update(request.body.read)}"
+end
+
+get '/' do
+    "HASHER running on #{Socket.gethostname}\n"
+end
+

examples/dockercoins/rng/Dockerfile

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+FROM python:alpine
+RUN pip install Flask
+COPY rng.py /
+CMD ["python", "rng.py"]
+EXPOSE 80

examples/dockercoins/rng/rng.py

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+from flask import Flask, Response
+import os
+import socket
+import time
+
+app = Flask(__name__)
+
+# Enable debugging if the DEBUG environment variable is set and starts with Y
+app.debug = os.environ.get("DEBUG", "").lower().startswith('y')
+
+hostname = socket.gethostname()
+
+urandom = os.open("/dev/urandom", os.O_RDONLY)
+
+
+@app.route("/")
+def index():
+    return "RNG running on {}\n".format(hostname)
+
+
+@app.route("/<int:how_many_bytes>")
+def rng(how_many_bytes):
+    # Simulate a little bit of delay
+    time.sleep(0.1)
+    return Response(
+        os.read(urandom, how_many_bytes),
+        content_type="application/octet-stream")
+
+
+if __name__ == "__main__":
+    app.run(host="0.0.0.0", port=80)
+

examples/dockercoins/webui/Dockerfile

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+FROM node:4-slim
+RUN npm install express
+RUN npm install redis
+COPY files/ /files/
+COPY webui.js /
+CMD ["node", "webui.js"]
+EXPOSE 80