func (daemon *Daemon) Close() error {
	errorsStrings := []string{}
	if err := daemon.shutdown(); err != nil {
		utils.Errorf("daemon.shutdown(): %s", err)
		errorsStrings = append(errorsStrings, err.Error())
	}
	if err := portallocator.ReleaseAll(); err != nil {
		utils.Errorf("portallocator.ReleaseAll(): %s", err)
		errorsStrings = append(errorsStrings, err.Error())
	}
	if err := daemon.driver.Cleanup(); err != nil {
		utils.Errorf("daemon.driver.Cleanup(): %s", err.Error())
		errorsStrings = append(errorsStrings, err.Error())
	}
	if err := daemon.containerGraph.Close(); err != nil {
		utils.Errorf("daemon.containerGraph.Close(): %s", err.Error())
		errorsStrings = append(errorsStrings, err.Error())
	}
	if len(errorsStrings) > 0 {
		return fmt.Errorf("%s", strings.Join(errorsStrings, ", "))
	}
	return nil
}

//.........这里部分代码省略.........

	if !config.DisableNetwork {
		job := eng.Job("init_networkdriver")

		job.SetenvBool("EnableIptables", config.EnableIptables)
		job.SetenvBool("InterContainerCommunication", config.InterContainerCommunication)
		job.SetenvBool("EnableIpForward", config.EnableIpForward)
		job.SetenvBool("EnableIpMasq", config.EnableIpMasq)
		job.SetenvBool("EnableIPv6", config.EnableIPv6)
		job.Setenv("BridgeIface", config.BridgeIface)
		job.Setenv("BridgeIP", config.BridgeIP)
		job.Setenv("FixedCIDR", config.FixedCIDR)
		job.Setenv("FixedCIDRv6", config.FixedCIDRv6)
		job.Setenv("DefaultBindingIP", config.DefaultIp.String())

		if err := job.Run(); err != nil {
			return nil, err
		}
	}

	graphdbPath := path.Join(config.Root, "linkgraph.db")
	graph, err := graphdb.NewSqliteConn(graphdbPath)
	if err != nil {
		return nil, err
	}

	localCopy := path.Join(config.Root, "init", fmt.Sprintf("dockerinit-%s", dockerversion.VERSION))
	sysInitPath := utils.DockerInitPath(localCopy)
	if sysInitPath == "" {
		return nil, fmt.Errorf("Could not locate dockerinit: This usually means docker was built incorrectly. See http://docs.docker.com/contributing/devenvironment for official build instructions.")
	}

	if sysInitPath != localCopy {
		// When we find a suitable dockerinit binary (even if it's our local binary), we copy it into config.Root at localCopy for future use (so that the original can go away without that being a problem, for example during a package upgrade).
		if err := os.Mkdir(path.Dir(localCopy), 0700); err != nil && !os.IsExist(err) {
			return nil, err
		}
		if _, err := utils.CopyFile(sysInitPath, localCopy); err != nil {
			return nil, err
		}
		if err := os.Chmod(localCopy, 0700); err != nil {
			return nil, err
		}
		sysInitPath = localCopy
	}

	sysInfo := sysinfo.New(false)
	ed, err := execdrivers.NewDriver(config.ExecDriver, config.Root, sysInitPath, sysInfo)
	if err != nil {
		return nil, err
	}

	daemon := &Daemon{
		ID:             trustKey.PublicKey().KeyID(),
		repository:     daemonRepo,
		containers:     &contStore{s: make(map[string]*Container)},
		execCommands:   newExecStore(),
		graph:          g,
		repositories:   repositories,
		idIndex:        truncindex.NewTruncIndex([]string{}),
		sysInfo:        sysInfo,
		volumes:        volumes,
		config:         config,
		containerGraph: graph,
		driver:         driver,
		sysInitPath:    sysInitPath,
		execDriver:     ed,
		eng:            eng,
		trustStore:     t,
	}
	if err := daemon.restore(); err != nil {
		return nil, err
	}

	// set up filesystem watch on resolv.conf for network changes
	if err := daemon.setupResolvconfWatcher(); err != nil {
		return nil, err
	}

	// Setup shutdown handlers
	// FIXME: can these shutdown handlers be registered closer to their source?
	eng.OnShutdown(func() {
		// FIXME: if these cleanup steps can be called concurrently, register
		// them as separate handlers to speed up total shutdown time
		if err := daemon.shutdown(); err != nil {
			log.Errorf("daemon.shutdown(): %s", err)
		}
		if err := portallocator.ReleaseAll(); err != nil {
			log.Errorf("portallocator.ReleaseAll(): %s", err)
		}
		if err := daemon.driver.Cleanup(); err != nil {
			log.Errorf("daemon.driver.Cleanup(): %s", err.Error())
		}
		if err := daemon.containerGraph.Close(); err != nil {
			log.Errorf("daemon.containerGraph.Close(): %s", err.Error())
		}
	})

	return daemon, nil
}