fixed errors when starting demo2 multiple times, added login and monitoring...

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__':