portGen := newPortGenerators()
	for _, p := range c.Ports {
		if p.ServicePort > 0 {
			if portGen.Service.IsUsed(p.ServicePort) {
				return fmt.Errorf("failed configuring port %s: service port already used %d", p.Name, p.ServicePort)
			}
			portGen.Service.SetUsed(p.ServicePort)
		}
		if p.WorkloadPort > 0 {
			if portGen.Instance.IsUsed(p.WorkloadPort) {