changed image search for ubuntu image

demo1-getting-started.py

+# Example for Cloud Computing Course Master AI / GSD
+#
+# based on the tutorial: https://developer.openstack.org/firstapp-libcloud/
+# uses libCloud: https://libcloud.apache.org/
+# libCloud API documentation: https://libcloud.readthedocs.io/en/latest/
+# OpenStack API documentation: https://developer.openstack.org/
+
 import getpass
 
-import libcloud.security
 from libcloud.compute.providers import get_driver
 from libcloud.compute.types import Provider
 
-auth_username = 'fdai109'
+# Please use 1-25 for X, as coordinated in the lab sessions
+
+# web service endpoint of the private cloud infrastructure
 auth_url = 'https://private-cloud2.informatik.hs-fulda.de:5000'
-project_name = 'ai-netlab-pro'
+# your username in OpenStack
+auth_username = 'CloudCompX'
+# your project in OpenStack
+project_name = 'CloudCompGrpX'
+
+# default region
 region_name = 'RegionOne'
-domain_name = "hsfulda"
+# domain to use, "default" for local accounts, "hsfulda" for LDAP of DVZ, e.g., using fdaiXXXX as auth_username
+domain_name = "default"
 
+# The image to look for and use for the started instance
 ubuntu_image_name = "Ubuntu 14.04 - Trusty Tahr - 64-bit - Cloud Based Image"
+# A network in the project the started instance will be attached to
+project_network = "CloudCompGrpX-net"
 
 
 def main():
-    print(auth_username)
+    # get the password from user
     auth_password = getpass.getpass("Enter your OpenStack password:")
-    # libcloud.security.VERIFY_SSL_CERT = False
+    # auth_password = "demo"
 
+    # instantiate a connection to the OpenStack private cloud
+    # make sure to include ex_domain_name and ex_force_auth_version='3.x_password', as they are needed in our
+    # environment
     provider = get_driver(Provider.OPENSTACK)
     conn = provider(auth_username,
                     auth_password,
@@ -27,6 +47,7 @@ def main():
                     ex_force_service_region=region_name,
                     ex_domain_name=domain_name)
 
+    # get a list of images offered in the cloud context (e.g. Ubuntu 14.04, Ubuntu 16.04, cirros, ...)
     images = conn.list_images()
     image = ''
     for img in images:
@@ -34,30 +55,38 @@ def main():
             image = img
             print(img)
 
+    # get a list of flavors offered in the cloud context (e.g. m1.small, m1.medium, ...)
     flavors = conn.list_sizes()
     for flavor in flavors:
         print(flavor)
 
+    # get the flavor with id 2
     flavor_id = '2'
     flavor = conn.ex_get_size(flavor_id)
     print(flavor)
 
+    # get a list of networks in the cloud context
     networks = conn.ex_list_networks()
     network = ''
     for net in networks:
-        if net.name == "ai-netlab-pro-net":
+        if net.name == project_network:
             network = net
 
+    # create a new instance with the name "testing"
+    # make sure to provide networks (networks={network}) the instance should be attached to
     instance_name = 'testing'
     testing_instance = conn.create_node(name=instance_name, image=image, size=flavor, networks={network})
     print(testing_instance)
 
+    # show all instances (running nodes) in the cloud context
     instances = conn.list_nodes()
     for instance in instances:
         print(instance)
 
+    # destroy the instance we have just created
     conn.destroy_node(testing_instance)
 
 
+# method that is called when the script is started from the command line
 if __name__ == '__main__':
     main()