func runInit(dockerCli command.Cli, flags *pflag.FlagSet, opts initOptions) error {
	client := dockerCli.Client()
	ctx := context.Background()

	req := swarm.InitRequest{
		ListenAddr:       opts.listenAddr.String(),
		AdvertiseAddr:    opts.advertiseAddr,
		ForceNewCluster:  opts.forceNewCluster,
		Spec:             opts.swarmOptions.ToSpec(flags),
		AutoLockManagers: opts.swarmOptions.autolock,
	}
	if flags.Changed(flagAvailability) {
		availability := swarm.NodeAvailability(strings.ToLower(opts.availability))
		switch availability {
		case swarm.NodeAvailabilityActive, swarm.NodeAvailabilityPause, swarm.NodeAvailabilityDrain:
			req.Availability = availability
		default:
			return fmt.Errorf("invalid availability %q, only active, pause and drain are supported", opts.availability)
		}
	}

	nodeID, err := client.SwarmInit(ctx, req)
	if err != nil {
		if strings.Contains(err.Error(), "could not choose an IP address to advertise") || strings.Contains(err.Error(), "could not find the system's IP address") {
			return errors.New(err.Error() + " - specify one with --advertise-addr")
		}
		return err
	}

	fmt.Fprintf(dockerCli.Out(), "Swarm initialized: current node (%s) is now a manager.\n\n", nodeID)

	if err := printJoinCommand(ctx, dockerCli, nodeID, false, true); err != nil {
		return err
	}

	fmt.Fprint(dockerCli.Out(), "To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.\n\n")

	if req.AutoLockManagers {
		unlockKeyResp, err := client.SwarmGetUnlockKey(ctx)
		if err != nil {
			return errors.Wrap(err, "could not fetch unlock key")
		}
		printUnlockCommand(ctx, dockerCli, unlockKeyResp.UnlockKey)
	}

	return nil
}

// Init initializes a new swarm cluster.
func (d *SwarmDaemon) Init(req swarm.InitRequest) error {
	if req.ListenAddr == "" {
		req.ListenAddr = d.listenAddr
	}
	status, out, err := d.SockRequest("POST", "/swarm/init", req)
	if status != http.StatusOK {
		return fmt.Errorf("initializing swarm: invalid statuscode %v, %q", status, out)
	}
	if err != nil {
		return fmt.Errorf("initializing swarm: %v", err)
	}
	info, err := d.info()
	if err != nil {
		return err
	}
	d.Info = info
	return nil
}