openstack:
        type: openstack
    
        # use-floating-ip specifies whether a floating IP address is
        # required to give the nodes a public IP address. Some
        # installations assign public IP addresses by default without
        # requiring a floating IP address.
        #
        # use-floating-ip: false
    
        # use-default-secgroup specifies whether new machine instances
        # should have the "default" Openstack security group assigned.
        #
        # use-default-secgroup: false
    
        # network specifies the network label or uuid to bring machines up
        # on, in the case where multiple networks exist. It may be omitted
        # otherwise.
        #
        # network: <your network label or uuid>
    
        # agent-metadata-url specifies the location of the Juju tools and
        # metadata. It defaults to the global public tools metadata
        # location https://streams.canonical.com/tools.
        #
        # agent-metadata-url:  https://your-agent-metadata-url
    
        # image-metadata-url specifies the location of Ubuntu cloud image
        # metadata. It defaults to the global public image metadata
        # location https://cloud-images.ubuntu.com/releases.
        #
        # image-metadata-url:  https://your-image-metadata-url
    
        # image-stream chooses a simplestreams stream from which to select
        # OS images, for example daily or released images (or any other stream
        # available on simplestreams).
        #
        # image-stream: "released"
    
        # agent-stream chooses a simplestreams stream from which to select tools,
        # for example released or proposed tools (or any other stream available
        # on simplestreams).
        #
        # agent-stream: "released"
    
        # auth-url defaults to the value of the environment variable
        # OS_AUTH_URL, but can be specified here.
        #
        # auth-url: https://yourkeystoneurl:443/v2.0/
    
        # tenant-name holds the openstack tenant name. It defaults to the
        # environment variable OS_TENANT_NAME.
        #
        # tenant-name: <your tenant name>
    
        # region holds the openstack region. It defaults to the
        # environment variable OS_REGION_NAME.
        #
        # region: <your region>
    
        # The auth-mode, username and password attributes are used for
        # userpass authentication (the default).
        #
        # auth-mode holds the authentication mode. For user-password
        # authentication, auth-mode should be "userpass" and username and
        # password should be set appropriately; they default to the
        # environment variables OS_USERNAME and OS_PASSWORD respectively.
        #
        # auth-mode: userpass
        # username: <your username>
        # password: <secret>
    
        # For key-pair authentication, auth-mode should be "keypair" and
        # access-key and secret-key should be set appropriately; they
        # default to the environment variables OS_ACCESS_KEY and
        # OS_SECRET_KEY respectively.
        #
        # auth-mode: keypair
        # access-key: <secret>
        # secret-key: <secret>
    
        # Whether or not to refresh the list of available updates for an
        # OS. The default option of true is recommended for use in
        # production systems, but disabling this can speed up local
        # deployments for development or testing.
        #
        # enable-os-refresh-update: true
    
        # Whether or not to perform OS upgrades when machines are
        # provisioned. The default option of true is recommended for use
        # in production systems, but disabling this can speed up local
        # deployments for development or testing.
        #
        # enable-os-upgrade: true