fixed errors when starting demo2 multiple times, added login and monitoring info in the output at the end of demo2

demo2-instance-with-init-script.py

@@ -21,6 +21,7 @@ project_network = 'CloudComp' + str(group_number) + '-net'
 
 # The image to look for and use for the started instance
 ubuntu_image_name = "Ubuntu 18.04 - Bionic Beaver - 64-bit - Cloud Based Image"
+# TODO: Ubuntu >18.04 would require major updates to faafo example again/better option: complete rewrite of example?
 
 # The public key to be used for SSH connection, please make sure, that you have the corresponding private key
 #
@@ -159,6 +160,7 @@ def main():
 
     if instance_exists:
         print('Instance ' + testing_instance.name + ' already exists. Skipping creation.')
+        exit()
     else:
         print('Starting new all-in-one instance and wait until it is running...')
         testing_instance = conn.create_node(name=instance_name,
@@ -211,11 +213,17 @@ def main():
     elif private_ip:
         actual_ip_address = private_ip
 
-    print('The Fractals app will be deployed to http://{}'.format(actual_ip_address))
-
-    print('You can use ssh to login to the instance using your private key. After login, you can list available '
-          'fractals using "faafo list". To request the generation of new fractals, you can use "faafo create". '
-          'You can also see other options to use the faafo example cloud service using "faafo -h".')
+    print('\n')
+    print('The Fractals app will be deployed to http://{}\n'.format(actual_ip_address))
+
+    print('You can use ssh to login to the instance using your private key. Default user name for official Ubuntu\n'
+          'Cloud Images is: ubuntu, so you can use, e.g.: "ssh -i ~/.ssh/id_rsa ubuntu@<floating-ip>" if your private\n'
+          'key is in the default location.\n\n'
+          'After login, you can list or "ssh ubuntu@<floating-ip>" available fractals using "faafo list". To request\n'
+          'the generation of new fractals, you can use "faafo create".\n\n'
+          'You can also see other options to use the faafo example cloud service using "faafo -h".\n\n'
+          'If you cannot start faafo command and/or do not see the webpage, you can check the Instance Console Log of\n'
+          'the instance, e.g., in OpenStack web interface.')
 
 
 if __name__ == '__main__':