command

type Command struct {
	Id          string
	Type        string // add|update|remove
	Image       string
	Name        string
	Cmd         []string
	Env         []string
	Vol         []string
	ExtraHosts  []string
	Listen      string // only one port will be registerd
	Service     string // name of service
	Backend     string // name of backend
	Cluster     string
	Proto       string // tcp|http
	DockerUser  string
	DockerPswd  string
	DockerEmail string
}