Golang NetworkController.NetworkByName方法代码示例

func createDefaultNetwork(c libnetwork.NetworkController) {
	nw := c.Config().Daemon.DefaultNetwork
	d := c.Config().Daemon.DefaultDriver
	createOptions := []libnetwork.NetworkOption{}
	genericOption := options.Generic{}

	if nw != "" && d != "" {
		// Bridge driver is special due to legacy reasons
		if d == "bridge" {
			genericOption[netlabel.GenericData] = map[string]string{
				"BridgeName":    "docker0",
				"DefaultBridge": "true",
			}
			createOptions = append(createOptions,
				libnetwork.NetworkOptionGeneric(genericOption),
				ipamOption(nw))
		}

		if n, err := c.NetworkByName(nw); err == nil {
			logrus.Debugf("Default network %s already present. Deleting it", nw)
			if err = n.Delete(); err != nil {
				logrus.Debugf("Network could not be deleted: %v", err)
				return
			}
		}

		_, err := c.NewNetwork(d, nw, createOptions...)
		if err != nil {
			logrus.Errorf("Error creating default network : %s : %v", nw, err)
		}
	}
}

func initBridgeDriver(controller libnetwork.NetworkController, config *Config) error {
	if _, err := controller.NetworkByName(runconfig.DefaultDaemonNetworkMode().NetworkName()); err == nil {
		return nil
	}

	netOption := map[string]string{
		winlibnetwork.NetworkName: runconfig.DefaultDaemonNetworkMode().NetworkName(),
	}

	ipamV4Conf := libnetwork.IpamConf{}
	if config.bridgeConfig.FixedCIDR == "" {
		ipamV4Conf.PreferredPool = defaultNetworkSpace
	} else {
		ipamV4Conf.PreferredPool = config.bridgeConfig.FixedCIDR
	}

	v4Conf := []*libnetwork.IpamConf{&ipamV4Conf}
	v6Conf := []*libnetwork.IpamConf{}

	_, err := controller.NewNetwork(string(runconfig.DefaultDaemonNetworkMode()), runconfig.DefaultDaemonNetworkMode().NetworkName(),
		libnetwork.NetworkOptionGeneric(options.Generic{
			netlabel.GenericData: netOption,
		}),
		libnetwork.NetworkOptionIpam("default", "", v4Conf, v6Conf, nil),
	)

	if err != nil {
		return fmt.Errorf("Error creating default network: %v", err)
	}
	return nil
}

func initBridgeDriver(controller libnetwork.NetworkController, config *Config) error {
	if _, err := controller.NetworkByName(runconfig.DefaultDaemonNetworkMode().NetworkName()); err == nil {
		return nil
	}

	netOption := map[string]string{
		winlibnetwork.NetworkName: runconfig.DefaultDaemonNetworkMode().NetworkName(),
	}

	var ipamOption libnetwork.NetworkOption
	var subnetPrefix string

	if config.bridgeConfig.FixedCIDR != "" {
		subnetPrefix = config.bridgeConfig.FixedCIDR
	} else {
		// TP5 doesn't support properly detecting subnet
		osv := system.GetOSVersion()
		if osv.Build < 14360 {
			subnetPrefix = defaultNetworkSpace
		}
	}

	if subnetPrefix != "" {
		ipamV4Conf := libnetwork.IpamConf{}
		ipamV4Conf.PreferredPool = subnetPrefix
		v4Conf := []*libnetwork.IpamConf{&ipamV4Conf}
		v6Conf := []*libnetwork.IpamConf{}
		ipamOption = libnetwork.NetworkOptionIpam("default", "", v4Conf, v6Conf, nil)
	}

	_, err := controller.NewNetwork(string(runconfig.DefaultDaemonNetworkMode()), runconfig.DefaultDaemonNetworkMode().NetworkName(), "",
		libnetwork.NetworkOptionGeneric(options.Generic{
			netlabel.GenericData: netOption,
		}),
		ipamOption,
	)

	if err != nil {
		return fmt.Errorf("Error creating default network: %v", err)
	}

	return nil
}

func findNetwork(c libnetwork.NetworkController, s string, by int) (libnetwork.Network, *responseStatus) {
	var (
		nw  libnetwork.Network
		err error
	)
	switch by {
	case byID:
		nw, err = c.NetworkByID(s)
	case byName:
		nw, err = c.NetworkByName(s)
	default:
		panic(fmt.Sprintf("unexpected selector for network search: %d", by))
	}
	if err != nil {
		if _, ok := err.(libnetwork.ErrNoSuchNetwork); ok {
			return nil, &responseStatus{Status: "Resource not found: Network", StatusCode: http.StatusNotFound}
		}
		return nil, &responseStatus{Status: err.Error(), StatusCode: http.StatusBadRequest}
	}
	return nw, &successResponse
}

func initBridgeDriver(controller libnetwork.NetworkController, config *Config) error {
	if n, err := controller.NetworkByName("bridge"); err == nil {
		if err = n.Delete(); err != nil {
			return fmt.Errorf("could not delete the default bridge network: %v", err)
		}
	}

	bridgeName := bridge.DefaultBridgeName
	if config.Bridge.Iface != "" {
		bridgeName = config.Bridge.Iface
	}
	netOption := map[string]string{
		bridge.BridgeName:         bridgeName,
		bridge.DefaultBridge:      strconv.FormatBool(true),
		netlabel.DriverMTU:        strconv.Itoa(config.Mtu),
		bridge.EnableIPMasquerade: strconv.FormatBool(config.Bridge.EnableIPMasq),
		bridge.EnableICC:          strconv.FormatBool(config.Bridge.InterContainerCommunication),
	}

	// --ip processing
	if config.Bridge.DefaultIP != nil {
		netOption[bridge.DefaultBindingIP] = config.Bridge.DefaultIP.String()
	}

	ipamV4Conf := libnetwork.IpamConf{}

	ipamV4Conf.AuxAddresses = make(map[string]string)

	if nw, _, err := ipamutils.ElectInterfaceAddresses(bridgeName); err == nil {
		ipamV4Conf.PreferredPool = nw.String()
		hip, _ := types.GetHostPartIP(nw.IP, nw.Mask)
		if hip.IsGlobalUnicast() {
			ipamV4Conf.Gateway = nw.IP.String()
		}
	}

	if config.Bridge.IP != "" {
		ipamV4Conf.PreferredPool = config.Bridge.IP
		ip, _, err := net.ParseCIDR(config.Bridge.IP)
		if err != nil {
			return err
		}
		ipamV4Conf.Gateway = ip.String()
	} else if bridgeName == bridge.DefaultBridgeName && ipamV4Conf.PreferredPool != "" {
		logrus.Infof("Default bridge (%s) is assigned with an IP address %s. Daemon option --bip can be used to set a preferred IP address", bridgeName, ipamV4Conf.PreferredPool)
	}

	if config.Bridge.FixedCIDR != "" {
		_, fCIDR, err := net.ParseCIDR(config.Bridge.FixedCIDR)
		if err != nil {
			return err
		}

		ipamV4Conf.SubPool = fCIDR.String()
	}

	if config.Bridge.DefaultGatewayIPv4 != nil {
		ipamV4Conf.AuxAddresses["DefaultGatewayIPv4"] = config.Bridge.DefaultGatewayIPv4.String()
	}

	var (
		ipamV6Conf     *libnetwork.IpamConf
		deferIPv6Alloc bool
	)
	if config.Bridge.FixedCIDRv6 != "" {
		_, fCIDRv6, err := net.ParseCIDR(config.Bridge.FixedCIDRv6)
		if err != nil {
			return err
		}

		// In case user has specified the daemon flag --fixed-cidr-v6 and the passed network has
		// at least 48 host bits, we need to guarantee the current behavior where the containers'
		// IPv6 addresses will be constructed based on the containers' interface MAC address.
		// We do so by telling libnetwork to defer the IPv6 address allocation for the endpoints
		// on this network until after the driver has created the endpoint and returned the
		// constructed address. Libnetwork will then reserve this address with the ipam driver.
		ones, _ := fCIDRv6.Mask.Size()
		deferIPv6Alloc = ones <= 80

		if ipamV6Conf == nil {
			ipamV6Conf = &libnetwork.IpamConf{AuxAddresses: make(map[string]string)}
		}
		ipamV6Conf.PreferredPool = fCIDRv6.String()
	}

	if config.Bridge.DefaultGatewayIPv6 != nil {
		if ipamV6Conf == nil {
			ipamV6Conf = &libnetwork.IpamConf{AuxAddresses: make(map[string]string)}
		}
		ipamV6Conf.AuxAddresses["DefaultGatewayIPv6"] = config.Bridge.DefaultGatewayIPv6.String()
	}

	v4Conf := []*libnetwork.IpamConf{&ipamV4Conf}
	v6Conf := []*libnetwork.IpamConf{}
	if ipamV6Conf != nil {
		v6Conf = append(v6Conf, ipamV6Conf)
	}
	// Initialize default network on "bridge" with the same name
	_, err := controller.NewNetwork("bridge", "bridge",
		libnetwork.NetworkOptionGeneric(options.Generic{
//.........这里部分代码省略.........

func initBridgeDriver(controller libnetwork.NetworkController, config *Config) error {
	if n, err := controller.NetworkByName("bridge"); err == nil {
		if err = n.Delete(); err != nil {
			return fmt.Errorf("could not delete the default bridge network: %v", err)
		}
	}

	bridgeName := bridge.DefaultBridgeName
	if config.bridgeConfig.Iface != "" {
		bridgeName = config.bridgeConfig.Iface
	}
	netOption := map[string]string{
		bridge.BridgeName:    bridgeName,
		bridge.DefaultBridge: strconv.FormatBool(true),
		netlabel.DriverMTU:   strconv.Itoa(config.Mtu),
		bridge.EnableICC:     strconv.FormatBool(config.bridgeConfig.InterContainerCommunication),
	}

	// --ip processing
	if config.bridgeConfig.DefaultIP != nil {
		netOption[bridge.DefaultBindingIP] = config.bridgeConfig.DefaultIP.String()
	}

	var ipamV4Conf *libnetwork.IpamConf

	ipamV4Conf = &libnetwork.IpamConf{AuxAddresses: make(map[string]string)}

	nwList, _, err := netutils.ElectInterfaceAddresses(bridgeName)
	if err != nil {
		return errors.Wrap(err, "list bridge addresses failed")
	}

	nw := nwList[0]
	if len(nwList) > 1 && config.bridgeConfig.FixedCIDR != "" {
		_, fCIDR, err := net.ParseCIDR(config.bridgeConfig.FixedCIDR)
		if err != nil {
			return errors.Wrap(err, "parse CIDR failed")
		}
		// Iterate through in case there are multiple addresses for the bridge
		for _, entry := range nwList {
			if fCIDR.Contains(entry.IP) {
				nw = entry
				break
			}
		}
	}

	ipamV4Conf.PreferredPool = lntypes.GetIPNetCanonical(nw).String()
	hip, _ := lntypes.GetHostPartIP(nw.IP, nw.Mask)
	if hip.IsGlobalUnicast() {
		ipamV4Conf.Gateway = nw.IP.String()
	}

	if config.bridgeConfig.IP != "" {
		ipamV4Conf.PreferredPool = config.bridgeConfig.IP
		ip, _, err := net.ParseCIDR(config.bridgeConfig.IP)
		if err != nil {
			return err
		}
		ipamV4Conf.Gateway = ip.String()
	} else if bridgeName == bridge.DefaultBridgeName && ipamV4Conf.PreferredPool != "" {
		logrus.Infof("Default bridge (%s) is assigned with an IP address %s. Daemon option --bip can be used to set a preferred IP address", bridgeName, ipamV4Conf.PreferredPool)
	}

	if config.bridgeConfig.FixedCIDR != "" {
		_, fCIDR, err := net.ParseCIDR(config.bridgeConfig.FixedCIDR)
		if err != nil {
			return err
		}

		ipamV4Conf.SubPool = fCIDR.String()
	}

	if config.bridgeConfig.DefaultGatewayIPv4 != nil {
		ipamV4Conf.AuxAddresses["DefaultGatewayIPv4"] = config.bridgeConfig.DefaultGatewayIPv4.String()
	}

	v4Conf := []*libnetwork.IpamConf{ipamV4Conf}
	v6Conf := []*libnetwork.IpamConf{}

	// Initialize default network on "bridge" with the same name
	_, err = controller.NewNetwork("bridge", "bridge", "",
		libnetwork.NetworkOptionDriverOpts(netOption),
		libnetwork.NetworkOptionIpam("default", "", v4Conf, v6Conf, nil),
		libnetwork.NetworkOptionDeferIPv6Alloc(false))
	if err != nil {
		return fmt.Errorf("Error creating default 'bridge' network: %v", err)
	}
	return nil
}

func initBridgeDriver(controller libnetwork.NetworkController, config *Config) error {
	if n, err := controller.NetworkByName("bridge"); err == nil {
		if err = n.Delete(); err != nil {
			return fmt.Errorf("could not delete the default bridge network: %v", err)
		}
	}

	bridgeName := bridge.DefaultBridgeName
	if config.Bridge.Iface != "" {
		bridgeName = config.Bridge.Iface
	}
	netOption := map[string]string{
		bridge.BridgeName:         bridgeName,
		bridge.DefaultBridge:      strconv.FormatBool(true),
		netlabel.DriverMTU:        strconv.Itoa(config.Mtu),
		bridge.EnableIPMasquerade: strconv.FormatBool(config.Bridge.EnableIPMasq),
		bridge.EnableICC:          strconv.FormatBool(config.Bridge.InterContainerCommunication),
	}

	// --ip processing
	if config.Bridge.DefaultIP != nil {
		netOption[bridge.DefaultBindingIP] = config.Bridge.DefaultIP.String()
	}

	ipamV4Conf := libnetwork.IpamConf{}

	ipamV4Conf.AuxAddresses = make(map[string]string)

	if nw, _, err := ipamutils.ElectInterfaceAddresses(bridgeName); err == nil {
		ipamV4Conf.PreferredPool = nw.String()
		hip, _ := types.GetHostPartIP(nw.IP, nw.Mask)
		if hip.IsGlobalUnicast() {
			ipamV4Conf.Gateway = nw.IP.String()
		}
	}

	if config.Bridge.IP != "" {
		ipamV4Conf.PreferredPool = config.Bridge.IP
		ip, _, err := net.ParseCIDR(config.Bridge.IP)
		if err != nil {
			return err
		}
		ipamV4Conf.Gateway = ip.String()
	}

	if config.Bridge.FixedCIDR != "" {
		_, fCIDR, err := net.ParseCIDR(config.Bridge.FixedCIDR)
		if err != nil {
			return err
		}

		ipamV4Conf.SubPool = fCIDR.String()
	}

	if config.Bridge.DefaultGatewayIPv4 != nil {
		ipamV4Conf.AuxAddresses["DefaultGatewayIPv4"] = config.Bridge.DefaultGatewayIPv4.String()
	}

	var ipamV6Conf *libnetwork.IpamConf
	if config.Bridge.FixedCIDRv6 != "" {
		_, fCIDRv6, err := net.ParseCIDR(config.Bridge.FixedCIDRv6)
		if err != nil {
			return err
		}
		if ipamV6Conf == nil {
			ipamV6Conf = &libnetwork.IpamConf{}
		}
		ipamV6Conf.PreferredPool = fCIDRv6.String()
	}

	if config.Bridge.DefaultGatewayIPv6 != nil {
		if ipamV6Conf == nil {
			ipamV6Conf = &libnetwork.IpamConf{}
		}
		ipamV6Conf.AuxAddresses["DefaultGatewayIPv6"] = config.Bridge.DefaultGatewayIPv6.String()
	}

	v4Conf := []*libnetwork.IpamConf{&ipamV4Conf}
	v6Conf := []*libnetwork.IpamConf{}
	if ipamV6Conf != nil {
		v6Conf = append(v6Conf, ipamV6Conf)
	}
	// Initialize default network on "bridge" with the same name
	_, err := controller.NewNetwork("bridge", "bridge",
		libnetwork.NetworkOptionGeneric(options.Generic{
			netlabel.GenericData: netOption,
			netlabel.EnableIPv6:  config.Bridge.EnableIPv6,
		}),
		libnetwork.NetworkOptionIpam("default", "", v4Conf, v6Conf))
	if err != nil {
		return fmt.Errorf("Error creating default \"bridge\" network: %v", err)
	}
	return nil
}

//Bridge网桥的初始化，以这个为重点分析。
func initBridgeDriver(controller libnetwork.NetworkController, config *Config) error {
	if n, err := controller.NetworkByName("bridge"); err == nil {
		if err = n.Delete(); err != nil {
			return fmt.Errorf("could not delete the default bridge network: %v", err)
		}
	}

	//配置默认网桥模式的interface的名称，默认为dockerO
	bridgeName := bridge.DefaultBridgeName
	if config.bridgeConfig.Iface != "" {
		bridgeName = config.bridgeConfig.Iface
	}
	//bridge网络的默认配置。
	netOption := map[string]string{
		bridge.BridgeName:         bridgeName,
		bridge.DefaultBridge:      strconv.FormatBool(true),
		netlabel.DriverMTU:        strconv.Itoa(config.Mtu),
		bridge.EnableIPMasquerade: strconv.FormatBool(config.bridgeConfig.EnableIPMasq),
		bridge.EnableICC:          strconv.FormatBool(config.bridgeConfig.InterContainerCommunication),
	}

	//配置docker0的默认IP地址。
	if config.bridgeConfig.DefaultIP != nil {
		netOption[bridge.DefaultBindingIP] = config.bridgeConfig.DefaultIP.String()
	}

	var (
		ipamV4Conf *libnetwork.IpamConf
		ipamV6Conf *libnetwork.IpamConf
	)

	ipamV4Conf = &libnetwork.IpamConf{AuxAddresses: make(map[string]string)}

	nw, nw6List, err := ipamutils.ElectInterfaceAddresses(bridgeName)
	if err == nil {
		ipamV4Conf.PreferredPool = lntypes.GetIPNetCanonical(nw).String()
		hip, _ := lntypes.GetHostPartIP(nw.IP, nw.Mask)
		if hip.IsGlobalUnicast() {
			ipamV4Conf.Gateway = nw.IP.String()
		}
	}

	if config.bridgeConfig.IP != "" {
		ipamV4Conf.PreferredPool = config.bridgeConfig.IP
		ip, _, err := net.ParseCIDR(config.bridgeConfig.IP)
		if err != nil {
			return err
		}
		ipamV4Conf.Gateway = ip.String()
	} else if bridgeName == bridge.DefaultBridgeName && ipamV4Conf.PreferredPool != "" {
		logrus.Infof("Default bridge (%s) is assigned with an IP address %s. Daemon option --bip can be used to set a preferred IP address", bridgeName, ipamV4Conf.PreferredPool)
	}

	if config.bridgeConfig.FixedCIDR != "" {
		_, fCIDR, err := net.ParseCIDR(config.bridgeConfig.FixedCIDR)
		if err != nil {
			return err
		}

		ipamV4Conf.SubPool = fCIDR.String()
	}

	if config.bridgeConfig.DefaultGatewayIPv4 != nil {
		ipamV4Conf.AuxAddresses["DefaultGatewayIPv4"] = config.bridgeConfig.DefaultGatewayIPv4.String()
	}

	var deferIPv6Alloc bool
	if config.bridgeConfig.FixedCIDRv6 != "" {
		_, fCIDRv6, err := net.ParseCIDR(config.bridgeConfig.FixedCIDRv6)
		if err != nil {
			return err
		}

		// In case user has specified the daemon flag --fixed-cidr-v6 and the passed network has
		// at least 48 host bits, we need to guarantee the current behavior where the containers'
		// IPv6 addresses will be constructed based on the containers' interface MAC address.
		// We do so by telling libnetwork to defer the IPv6 address allocation for the endpoints
		// on this network until after the driver has created the endpoint and returned the
		// constructed address. Libnetwork will then reserve this address with the ipam driver.
		ones, _ := fCIDRv6.Mask.Size()
		deferIPv6Alloc = ones <= 80

		if ipamV6Conf == nil {
			ipamV6Conf = &libnetwork.IpamConf{AuxAddresses: make(map[string]string)}
		}
		ipamV6Conf.PreferredPool = fCIDRv6.String()

		// In case the --fixed-cidr-v6 is specified and the current docker0 bridge IPv6
		// address belongs to the same network, we need to inform libnetwork about it, so
		// that it can be reserved with IPAM and it will not be given away to somebody else
		for _, nw6 := range nw6List {
			if fCIDRv6.Contains(nw6.IP) {
				ipamV6Conf.Gateway = nw6.IP.String()
				break
			}
		}
	}

	if config.bridgeConfig.DefaultGatewayIPv6 != nil {
//.........这里部分代码省略.........