Add readme

webapp/image/README.md

+# Service VM image creation
+
+## Description
+
+The scripts contained in the webapp/image directory are responsible for assisting an
+administrator in creating a new Service VM image.
+
+
+### ansible-vm-init
+
+The run-once init script responsible for  the initial configuration of the Service VM, after it has
+been created using the image. It runs ansible on localhost, using local connection, and including
+ the tags necessary for the initial configurations. Then, after a successful run, the init script
+ disables and deletes itself.
+
+### index.html
+
+The default apache page. It contains the AdminLTE template, and is used as a waiting page for the
+ user, while his Service VM initializes. The page auto-refreshes every 20 seconds, so that when
+ the Service VM has been configured, the Lambda webpage appears.
+
+### setup_default_site.sh
+
+Script responsible for setting up the default apache page. It copies the index.html, along with
+the necessary js/css/image files, taken from the ember project directories.
+
+### create_image.sh
+
+Script responsible for creating a Service VM image. It must be run on a service VM. It sets up
+the default site, enables the ansible-vm-init init script, then runs snf-image-creator, to bundle
+ the host.
+
+## Usage
+
+1. Create a new Service VM, by issuing:
+`webapp/manager/service_vm_manager.py --action image_creation`.
+2. After the service_vm_manager finishes successfully, ssh to the created VM.
+3. Navigate to the image folder on the Service VM: `cd /var/www/okeanos-LoD/webapp/image`.
+4. Run `./create_image.sh`.
+5. snf-image-creator will run, to bundle the host. Insert the required image properties, and
+~okeanos credentials, to register your new image on the ~okeanos cloud. Recommended image
+name/description: Lambda Service VM YYYYMMDD. (eg. Lambda Service VM 20151219)