script to authorize a port from within 'starcluster shell' Cribbed from [ipcluster._authorize_port](https://github.com/jtriley/StarCluster/blob/develop/starcluster/plugins/ipcluster.py#L263)

open_master_port_via_starcluster.py

# settings
port = 9999
service_name = 'my_service'
cluster_name = 'my_cluster'
protocol = 'tcp'
world_cidr = '0.0.0.0/0'


master = cm.get_cluster(cluster_name).master_node
group = master.cluster_groups[0]
if isinstance(port, tuple):
    port_min, port_max = port
else:
    port_min, port_max = port, port

port_open = master.ec2.has_permission(group, protocol, port_min, port_max,
        world_cidr)

if not port_open:
    log_str = "Authorizing tcp ports [%s-%s] on %s for: %s" % \
            (port_min, port_max, world_cidr, service_name)
    print log_str
    master.ec2.conn.authorize_security_group(
            group_id=group.id, ip_protocol='tcp',
            from_port=port_min,
            to_port=port_max, cidr_ip=world_cidr)