- `shutdown_command` (string) - Specify a VM guest shutdown command. This command will be executed using the `communicator`. Otherwise the VMware guest tools are used to gracefully shutdown the VM guest. - `shutdown_timeout` (duration string | ex: "1h5m2s") - Amount of time to wait for graceful VM shutdown. Defaults to 5m or five minutes. This will likely need to be modified if the `communicator` is 'none'. - `disable_shutdown` (bool) - Packer normally halts the virtual machine after all provisioners have run when no `shutdown_command` is defined. If this is set to `true`, Packer *will not* halt the virtual machine but will assume that you will send the stop signal yourself through a preseed.cfg, a script or the final provisioner. Packer will wait for a default of five minutes until the virtual machine is shutdown. The timeout can be changed using `shutdown_timeout` option.