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+Config drive creation tool
+==========================
+
+Script gives you an ability to build iso file for MCP instances.
+
+No, it is not for VCP instances. VCP instances config drives are configured by
+salt master. This script is intended only for building config drives for
+salt master and aptly mirror(for offline deployments).
+
+It has as many features as openstack cloud init format provides.
+You can use network_data.json vendor_data.json or not specify them at all.
+
+Networking part is a major part here.
+If you specify --network-data key with network_data.json it has highest priority
+on network set up, further network configuration is ignored and taken completely
+from json file you specify.
+This is how you can specify configuration for multiple interfaces if you wish.
+Without this file instance should have network configuration being done somehow
+and basic information is taken by passing:
+
+     --ip,
+     --netmask,
+     --gateway(optional, used for default route),
+     --interface(optional, default ens3 is used)
+
+argumetns.
+
+So in order to create iso file script should know these parameters and you need
+to pass them, otherwise one should implement logic based on write_files: section
+and catching SALT_MASTER_DEPLOY_IP or APTLY_DEPLOY_IP parameters which may
+change its names in time.
+In this case basic network configuration would be done and further actions, like
+setting up mtu, vlans, bridges, should be taken by config management tool (salt).
+
+You may want to skip network at all and just pass --skip-network, so instance
+would start with meta_data.json and user_data.
+
+Other parameters like MCP_VERSION are out of scope of this tool and are not
+going to be calculated. You need to edit yaml files before creating iso files
+and specify them on your own.
+
+Vendor metadata can be specified in native json format of openstack:
+- vendor_data.json (StaticJSON)
+
+If you want to add ssh key to your instance, you can specify it via --ssh-key
+parameter. If you are going to add multiple ssh keys, you need to use
+--ssh-keys parameter and specify path to a file in authorized_keys format which
+has them. If you specify both, they would be merged and deduplicated.
+
+If you want to have an access to your instance via ssh, you need to know default
+username for a cloud image.
+However you can specify it using --cloud-user-name parameter and ssh keys would
+be added to it. This user has sudo privileges.
+
+If you feel you need to get an access to your instance via serial tty, you can
+specify --cloud-user-pass parameter and user section would be updated.