Add C5M3 files

Course5/Lab3/hello_cloud.py

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+#!/usr/bin/env python3
+# Copyright 2019 Google LLC
+#
+# 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.
+
+"""A simple Hello World type app which can serve on port 8000.
+Optionally, a different port can be passed.
+
+The code was inspired by:
+https://gist.github.com/davidbgk/b10113c3779b8388e96e6d0c44e03a74
+"""
+import http
+import http.server
+import socket
+import socketserver
+import sys
+
+# TCP port for listening to connections, if no port is received
+DEFAULT_PORT=8000
+
+class Handler(http.server.SimpleHTTPRequestHandler):
+    def do_GET(self):
+        self.send_response(http.HTTPStatus.OK)
+        self.end_headers()
+        # Hello message
+        self.wfile.write(b'Hello Cloud')
+        # Now get the hostname and IP and print that as well.
+        hostname = socket.gethostname()
+        host_ip = socket.gethostbyname(hostname)
+        self.wfile.write(
+            '\n\nHostname: {} \nIP Address: {}'.format(
+                hostname, host_ip).encode())
+
+
+def main(argv):
+    port = DEFAULT_PORT
+    if len(argv) > 1:
+        port = int(argv[1])
+
+    web_server = socketserver.TCPServer(('', port), Handler)
+    print("Listening for connections on port {}".format(port))
+    web_server.serve_forever()
+
+
+if __name__ == "__main__":
+    main(sys.argv)

Course5/Lab3/hello_cloud.service

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+[Unit]
+After=network.target
+
+[Service]
+ExecStart=/usr/local/bin/hello_cloud.py 80
+
+[Install]
+WantedBy=default.target