Adding ec2-related module example to examples/playbooks

examples/playbooks/eucalyptus-ec2.yml

+---
+# This playbook is an example for deploying multiple instances into EC2/Euca and "doing something" with them.
+#   - uses the ec2 and ec2_vol module.
+#
+# Run this with ansible-playbook and supply the private key for your EC2/Euca user (to access the instance in the second play), e.g:
+# ansible-playbook eucalyptus-ec2-deploy.yml -v --private-key=/path/to/ec2/pri/key
+
+- name: Stage instance(s)
+  hosts: local
+  connection: local
+  user: root
+  gather_facts: false
+
+  vars:
+      keypair: mykeypair
+      instance_type: m1.small
+      security_group: default
+      image: emi-048B3A37
+
+  # Launch 5 instances with the following parameters.  Register the output.
+
+  tasks:
+    - name: Launch instance 
+      local_action: ec2 keypair=$keypair group=$security_group instance_type=$instance_type image=$image wait=true count=5 
+      register: ec2
+    
+    # Use with_items to add each instances public IP to a new hostgroup for use in the next play.
+
+    - name: Add new instances to host group
+      local_action: add_host hostname=${item.public_ip} groupname=deploy
+      with_items: ${ec2.instances}
+
+    # Use the ec2_vol module to create volumes for attachment to each instance. Use with_items to attach to each instance (by returned id) launched previously.
+
+    - name: Create a volume and attach
+      local_action: ec2_vol volume_size=20 instance=${item.id}
+      with_items: ${ec2.instances}
+
+# This play targets the new host group
+
+- name: Configure instance
+  hosts: deploy
+  user: root
+  gather_facts: True
+
+  # Do some stuff on each instance ....
+
+  tasks:
+    - name: Ensure NTP is up and running
+      action: service name=ntpd state=started
+   
+    - name: Install Apache Web Server
+      action: yum pkg=httpd state=latest