USAGE

$ mhaws [subcommand] --interface_id=ENI-id [... args passed by MHA]

required arguments:
  1. failover method is ENI attach/detach
    --interface_id=[ENI-id for master VIP]
  
  2. failover method is RouteTable change destination
    --route_table_id=[RouteTable-id]
    --vip=[master VIP]

subcommand:
  master_ip_failover
  master_ip_online_change
  shutdown