Create Key Pair

Factor out key pair creation into its own method to make key pair
creation clearer.

Change-Id: I871c95df12cf5d00484775389816900849789a80

doc/source/users/guides/compute.rst

@@ -52,6 +52,18 @@ A **network** provides connectivity to servers.
 
 Full example: `network resource list`_
 
+Create Key Pair
+---------------
+
+A **key pair** is the public key and private key of
+`public–key cryptography`_. They are used to encrypt and decrypt login
+information when connecting to your server.
+
+.. literalinclude:: ../examples/compute/create.py
+   :pyobject: create_keypair
+
+Full example: `compute resource create`_
+
 Create Server
 -------------
 
@@ -60,8 +72,8 @@ creation. You can discover the names and IDs of these attributes by listing
 them as above and then using the find methods to get the appropriate
 resources.
 
-Ideally you'll also create a server using a public/private keypair so you can
+Ideally you'll also create a server using a keypair so you can login to that
-login to that server with the private key.
+server with the private key.
 
 Servers take time to boot so we call ``wait_for_server`` to wait
 for it to become active.
@@ -74,3 +86,4 @@ Full example: `compute resource create`_
 .. _compute resource list: http://git.openstack.org/cgit/openstack/python-openstacksdk/tree/examples/compute/list.py
 .. _network resource list: http://git.openstack.org/cgit/openstack/python-openstacksdk/tree/examples/network/list.py
 .. _compute resource create: http://git.openstack.org/cgit/openstack/python-openstacksdk/tree/examples/compute/create.py
+.. _public–key cryptography: https://en.wikipedia.org/wiki/Public-key_cryptography

examples/compute/create.py

@@ -25,24 +25,35 @@ For a full guide see TODO(etoews):link to docs on developer.openstack.org
 """
 
 
-def create_server(conn):
+def create_keypair(conn):
-    print("Create Server:")
+    keypair = conn.compute.find_keypair(KEYPAIR_NAME)
 
-    image = conn.compute.find_image(IMAGE_NAME)
+    if not keypair:
-    flavor = conn.compute.find_flavor(FLAVOR_NAME)
+        print("Create Key Pair:")
-    network = conn.network.find_network(NETWORK_NAME)
 
-    if not conn.compute.find_keypair(KEYPAIR_NAME):
         keypair = conn.compute.create_keypair(name=KEYPAIR_NAME)
 
+        print(keypair)
+
         with open(PRIVATE_KEYPAIR_FILE, 'w') as f:
             f.write("%s" % keypair.private_key)
 
         os.chmod(PRIVATE_KEYPAIR_FILE, 0o400)
 
+    return keypair
+
+
+def create_server(conn):
+    print("Create Server:")
+
+    image = conn.compute.find_image(IMAGE_NAME)
+    flavor = conn.compute.find_flavor(FLAVOR_NAME)
+    network = conn.network.find_network(NETWORK_NAME)
+    keypair = create_keypair(conn)
+
     server = conn.compute.create_server(
         name='openstacksdk-example', image=image, flavor=flavor,
-        networks=[{"uuid": network.id}], key_name=KEYPAIR_NAME)
+        networks=[{"uuid": network.id}], key_name=keypair.name)
 
     server = conn.compute.wait_for_server(server)