libnetwork

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Version: v0.1.0 Latest Latest
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Published: Jul 8, 2015 License: Apache-2.0, BSD-2-Clause Imports: 31 Imported by: 0

README

libnetwork - networking for containers

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Libnetwork provides a native Go implementation for connecting containers

The goal of libnetwork is to deliver a robust Container Network Model that provides a consistent programming interface and the required network abstractions for applications.

NOTE: libnetwork project is under heavy development and is not ready for general use.

Design

Please refer to the design for more information.

Using libnetwork

There are many networking solutions available to suit a broad range of use-cases. libnetwork uses a driver / plugin model to support all of these solutions while abstracting the complexity of the driver implementations by exposing a simple and consistent Network Model to users.

        // Create a new controller instance
        controller := libnetwork.New()

        // Select and configure the network driver
        networkType := "bridge"

        driverOptions := options.Generic{}
        genericOption := make(map[string]interface{})
        genericOption[netlabel.GenericData] = driverOptions
        err := controller.ConfigureNetworkDriver(networkType, genericOption)
        if err != nil {
                return
        }

        // Create a network for containers to join.
        // NewNetwork accepts Variadic optional arguments that libnetwork and Drivers can make of
        network, err := controller.NewNetwork(networkType, "network1")
        if err != nil {
                return
        }

        // For each new container: allocate IP and interfaces. The returned network
        // settings will be used for container infos (inspect and such), as well as
        // iptables rules for port publishing. This info is contained or accessible
        // from the returned endpoint.
        ep, err := network.CreateEndpoint("Endpoint1")
        if err != nil {
                return
        }

        // A container can join the endpoint by providing the container ID to the join
        // api.
        // Join accepts Variadic arguments which will be made use of by libnetwork and Drivers
        err = ep.Join("container1",
                libnetwork.JoinOptionHostname("test"),
                libnetwork.JoinOptionDomainname("docker.io"))
        if err != nil {
                return
        }

		// libnetwork client can check the endpoint's operational data via the Info() API
		epInfo, err := ep.DriverInfo()
		mapData, ok := epInfo[netlabel.PortMap]
		if ok {
			portMapping, ok := mapData.([]netutils.PortBinding)
			if ok {
				fmt.Printf("Current port mapping for endpoint %s: %v", ep.Name(), portMapping)
			}
		}

Current Status

Please watch this space for updates on the progress.

Currently libnetwork is nothing more than an attempt to modularize the Docker platform's networking subsystem by moving it into libnetwork as a library.

Future

Please refer to roadmap for more information.

Contributing

Want to hack on libnetwork? Docker's contributions guidelines apply.

Code and documentation copyright 2015 Docker, inc. Code released under the Apache 2.0 license. Docs released under Creative commons.

Documentation

Overview

Package libnetwork provides the basic functionality and extension points to create network namespaces and allocate interfaces for containers to use.

// Create a new controller instance
controller, _err := libnetwork.New(nil)

// Select and configure the network driver
networkType := "bridge"

driverOptions := options.Generic{}
genericOption := make(map[string]interface{})
genericOption[netlabel.GenericData] = driverOptions
err := controller.ConfigureNetworkDriver(networkType, genericOption)
if err != nil {
	return
}

// Create a network for containers to join.
// NewNetwork accepts Variadic optional arguments that libnetwork and Drivers can make of
network, err := controller.NewNetwork(networkType, "network1")
if err != nil {
	return
}

// For each new container: allocate IP and interfaces. The returned network
// settings will be used for container infos (inspect and such), as well as
// iptables rules for port publishing. This info is contained or accessible
// from the returned endpoint.
ep, err := network.CreateEndpoint("Endpoint1")
if err != nil {
	return
}

// A container can join the endpoint by providing the container ID to the join
// api.
// Join accepts Variadic arguments which will be made use of by libnetwork and Drivers
err = ep.Join("container1",
	libnetwork.JoinOptionHostname("test"),
	libnetwork.JoinOptionDomainname("docker.io"))
if err != nil {
	return
}

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

This section is empty.

Types

type ActiveContainerError

type ActiveContainerError struct {
	// contains filtered or unexported fields
}

ActiveContainerError is returned when an endpoint is deleted which has active containers attached to it.

func (*ActiveContainerError) Error

func (ace *ActiveContainerError) Error() string

func (*ActiveContainerError) Forbidden

func (ace *ActiveContainerError) Forbidden()

Forbidden denotes the type of this error

type ActiveEndpointsError

type ActiveEndpointsError struct {
	// contains filtered or unexported fields
}

ActiveEndpointsError is returned when a network is deleted which has active endpoints in it.

func (*ActiveEndpointsError) Error

func (aee *ActiveEndpointsError) Error() string

func (*ActiveEndpointsError) Forbidden

func (aee *ActiveEndpointsError) Forbidden()

Forbidden denotes the type of this error

type ContainerData

type ContainerData struct {
	SandboxKey string
}

ContainerData is a set of data returned when a container joins an endpoint.

type ContainerInfo

type ContainerInfo interface {
	// ID returns the ID of the container
	ID() string
	// Labels returns the container's labels
	Labels() map[string]interface{}
}

ContainerInfo provides an interface to retrieve the info about the container attached to the endpoint

type Endpoint

type Endpoint interface {
	// A system generated id for this endpoint.
	ID() string

	// Name returns the name of this endpoint.
	Name() string

	// Network returns the name of the network to which this endpoint is attached.
	Network() string

	// Join creates a new sandbox for the given container ID and populates the
	// network resources allocated for the endpoint and joins the sandbox to
	// the endpoint.
	Join(containerID string, options ...EndpointOption) error

	// Leave removes the sandbox associated with  container ID and detaches
	// the network resources populated in the sandbox
	Leave(containerID string, options ...EndpointOption) error

	// Return certain operational data belonging to this endpoint
	Info() EndpointInfo

	// DriverInfo returns a collection of driver operational data related to this endpoint retrieved from the driver
	DriverInfo() (map[string]interface{}, error)

	// ContainerInfo returns the info available at the endpoint about the attached container
	ContainerInfo() ContainerInfo

	// Delete and detaches this endpoint from the network.
	Delete() error

	// Retrieve the interfaces' statistics from the sandbox
	Statistics() (map[string]*sandbox.InterfaceStatistics, error)
}

Endpoint represents a logical connection between a network and a sandbox.

type EndpointInfo

type EndpointInfo interface {
	// InterfaceList returns an interface list which were assigned to the endpoint
	// by the driver. This can be used after the endpoint has been created.
	InterfaceList() []InterfaceInfo

	// Gateway returns the IPv4 gateway assigned by the driver.
	// This will only return a valid value if a container has joined the endpoint.
	Gateway() net.IP

	// GatewayIPv6 returns the IPv6 gateway assigned by the driver.
	// This will only return a valid value if a container has joined the endpoint.
	GatewayIPv6() net.IP

	// SandboxKey returns the sanbox key for the container which has joined
	// the endpoint. If there is no container joined then this will return an
	// empty string.
	SandboxKey() string
}

EndpointInfo provides an interface to retrieve network resources bound to the endpoint.

type EndpointOption

type EndpointOption func(ep *endpoint)

EndpointOption is a option setter function type used to pass varios options to Network and Endpoint interfaces methods. The various setter functions of type EndpointOption are provided by libnetwork, they look like <Create|Join|Leave>Option[...](...)

func CreateOptionExposedPorts

func CreateOptionExposedPorts(exposedPorts []types.TransportPort) EndpointOption

CreateOptionExposedPorts function returns an option setter for the container exposed ports option to be passed to network.CreateEndpoint() method.

func CreateOptionPortMapping

func CreateOptionPortMapping(portBindings []types.PortBinding) EndpointOption

CreateOptionPortMapping function returns an option setter for the mapping ports option to be passed to network.CreateEndpoint() method.

func EndpointOptionGeneric

func EndpointOptionGeneric(generic map[string]interface{}) EndpointOption

EndpointOptionGeneric function returns an option setter for a Generic option defined in a Dictionary of Key-Value pair

func JoinOptionDNS

func JoinOptionDNS(dns string) EndpointOption

JoinOptionDNS function returns an option setter for dns entry option to be passed to endpoint Join method.

func JoinOptionDNSSearch

func JoinOptionDNSSearch(search string) EndpointOption

JoinOptionDNSSearch function returns an option setter for dns search entry option to be passed to endpoint Join method.

func JoinOptionDomainname

func JoinOptionDomainname(name string) EndpointOption

JoinOptionDomainname function returns an option setter for domainname option to be passed to endpoint Join method.

func JoinOptionExtraHost

func JoinOptionExtraHost(name string, IP string) EndpointOption

JoinOptionExtraHost function returns an option setter for extra /etc/hosts options which is a name and IP as strings.

func JoinOptionGeneric

func JoinOptionGeneric(generic map[string]interface{}) EndpointOption

JoinOptionGeneric function returns an option setter for Generic configuration that is not managed by libNetwork but can be used by the Drivers during the call to endpoint join method. Container Labels are a good example.

func JoinOptionHostname

func JoinOptionHostname(name string) EndpointOption

JoinOptionHostname function returns an option setter for hostname option to be passed to endpoint Join method.

func JoinOptionHostsPath

func JoinOptionHostsPath(path string) EndpointOption

JoinOptionHostsPath function returns an option setter for hostspath option to be passed to endpoint Join method.

func JoinOptionParentUpdate

func JoinOptionParentUpdate(eid string, name, ip string) EndpointOption

JoinOptionParentUpdate function returns an option setter for parent container which needs to update the IP address for the linked container.

func JoinOptionPriority

func JoinOptionPriority(prio int) EndpointOption

JoinOptionPriority function returns an option setter for priority option to be passed to endpoint Join method.

func JoinOptionResolvConfPath

func JoinOptionResolvConfPath(path string) EndpointOption

JoinOptionResolvConfPath function returns an option setter for resolvconfpath option to be passed to endpoint Join method.

func JoinOptionUseDefaultSandbox

func JoinOptionUseDefaultSandbox() EndpointOption

JoinOptionUseDefaultSandbox function returns an option setter for using default sandbox to be passed to endpoint Join method.

type EndpointWalker

type EndpointWalker func(ep Endpoint) bool

EndpointWalker is a client provided function which will be used to walk the Endpoints. When the function returns true, the walk will stop.

type ErrInvalidConfigFile

type ErrInvalidConfigFile string

ErrInvalidConfigFile type is returned when an invalid LibNetwork config file is detected

func (ErrInvalidConfigFile) Error

func (cf ErrInvalidConfigFile) Error() string

type ErrInvalidID

type ErrInvalidID string

ErrInvalidID is returned when a query-by-id method is being invoked with an empty id parameter

func (ErrInvalidID) BadRequest

func (ii ErrInvalidID) BadRequest()

BadRequest denotes the type of this error

func (ErrInvalidID) Error

func (ii ErrInvalidID) Error() string

type ErrInvalidJoin

type ErrInvalidJoin struct{}

ErrInvalidJoin is returned if a join is attempted on an endpoint which already has a container joined.

func (ErrInvalidJoin) BadRequest

func (ij ErrInvalidJoin) BadRequest()

BadRequest denotes the type of this error

func (ErrInvalidJoin) Error

func (ij ErrInvalidJoin) Error() string

type ErrInvalidName

type ErrInvalidName string

ErrInvalidName is returned when a query-by-name or resource create method is invoked with an empty name parameter

func (ErrInvalidName) BadRequest

func (in ErrInvalidName) BadRequest()

BadRequest denotes the type of this error

func (ErrInvalidName) Error

func (in ErrInvalidName) Error() string

type ErrInvalidNetworkDriver

type ErrInvalidNetworkDriver string

ErrInvalidNetworkDriver is returned if an invalid driver name is passed.

func (ErrInvalidNetworkDriver) BadRequest

func (ind ErrInvalidNetworkDriver) BadRequest()

BadRequest denotes the type of this error

func (ErrInvalidNetworkDriver) Error

func (ind ErrInvalidNetworkDriver) Error() string

type ErrNoContainer

type ErrNoContainer struct{}

ErrNoContainer is returned when the endpoint has no container attached to it.

func (ErrNoContainer) Error

func (nc ErrNoContainer) Error() string

func (ErrNoContainer) Maskable

func (nc ErrNoContainer) Maskable()

Maskable denotes the type of this error

type ErrNoSuchEndpoint

type ErrNoSuchEndpoint string

ErrNoSuchEndpoint is returned when a endpoint query finds no result

func (ErrNoSuchEndpoint) Error

func (nse ErrNoSuchEndpoint) Error() string

func (ErrNoSuchEndpoint) NotFound

func (nse ErrNoSuchEndpoint) NotFound()

NotFound denotes the type of this error

type ErrNoSuchNetwork

type ErrNoSuchNetwork string

ErrNoSuchNetwork is returned when a network query finds no result

func (ErrNoSuchNetwork) Error

func (nsn ErrNoSuchNetwork) Error() string

func (ErrNoSuchNetwork) NotFound

func (nsn ErrNoSuchNetwork) NotFound()

NotFound denotes the type of this error

type InterfaceInfo

type InterfaceInfo interface {
	// MacAddress returns the MAC address assigned to the endpoint.
	MacAddress() net.HardwareAddr

	// Address returns the IPv4 address assigned to the endpoint.
	Address() net.IPNet

	// AddressIPv6 returns the IPv6 address assigned to the endpoint.
	AddressIPv6() net.IPNet
}

InterfaceInfo provides an interface to retrieve interface addresses bound to the endpoint.

type InvalidContainerIDError

type InvalidContainerIDError string

InvalidContainerIDError is returned when an invalid container id is passed in Join/Leave

func (InvalidContainerIDError) BadRequest

func (id InvalidContainerIDError) BadRequest()

BadRequest denotes the type of this error

func (InvalidContainerIDError) Error

func (id InvalidContainerIDError) Error() string

type Network

type Network interface {
	// A user chosen name for this network.
	Name() string

	// A system generated id for this network.
	ID() string

	// The type of network, which corresponds to its managing driver.
	Type() string

	// Create a new endpoint to this network symbolically identified by the
	// specified unique name. The options parameter carry driver specific options.
	// Labels support will be added in the near future.
	CreateEndpoint(name string, options ...EndpointOption) (Endpoint, error)

	// Delete the network.
	Delete() error

	// Endpoints returns the list of Endpoint(s) in this network.
	Endpoints() []Endpoint

	// WalkEndpoints uses the provided function to walk the Endpoints
	WalkEndpoints(walker EndpointWalker)

	// EndpointByName returns the Endpoint which has the passed name. If not found, the error ErrNoSuchEndpoint is returned.
	EndpointByName(name string) (Endpoint, error)

	// EndpointByID returns the Endpoint which has the passed id. If not found, the error ErrNoSuchEndpoint is returned.
	EndpointByID(id string) (Endpoint, error)
}

A Network represents a logical connectivity zone that containers may join using the Link method. A Network is managed by a specific driver.

type NetworkController

type NetworkController interface {
	// ConfigureNetworkDriver applies the passed options to the driver instance for the specified network type
	ConfigureNetworkDriver(networkType string, options map[string]interface{}) error

	// Config method returns the bootup configuration for the controller
	Config() config.Config

	// Create a new network. The options parameter carries network specific options.
	// Labels support will be added in the near future.
	NewNetwork(networkType, name string, options ...NetworkOption) (Network, error)

	// Networks returns the list of Network(s) managed by this controller.
	Networks() []Network

	// WalkNetworks uses the provided function to walk the Network(s) managed by this controller.
	WalkNetworks(walker NetworkWalker)

	// NetworkByName returns the Network which has the passed name. If not found, the error ErrNoSuchNetwork is returned.
	NetworkByName(name string) (Network, error)

	// NetworkByID returns the Network which has the passed id. If not found, the error ErrNoSuchNetwork is returned.
	NetworkByID(id string) (Network, error)

	// LeaveAll accepts a container id and attempts to leave all endpoints that the container has joined
	LeaveAll(id string) error

	// GC triggers immediate garbage collection of resources which are garbage collected.
	GC()
}

NetworkController provides the interface for controller instance which manages networks.

func New

func New(cfgOptions ...config.Option) (NetworkController, error)

New creates a new instance of network controller.

type NetworkNameError

type NetworkNameError string

NetworkNameError is returned when a network with the same name already exists.

func (NetworkNameError) Error

func (nnr NetworkNameError) Error() string

func (NetworkNameError) Forbidden

func (nnr NetworkNameError) Forbidden()

Forbidden denotes the type of this error

type NetworkOption

type NetworkOption func(n *network)

NetworkOption is a option setter function type used to pass varios options to NewNetwork method. The various setter functions of type NetworkOption are provided by libnetwork, they look like NetworkOptionXXXX(...)

func NetworkOptionGeneric

func NetworkOptionGeneric(generic map[string]interface{}) NetworkOption

NetworkOptionGeneric function returns an option setter for a Generic option defined in a Dictionary of Key-Value pair

type NetworkTypeError

type NetworkTypeError string

NetworkTypeError type is returned when the network type string is not known to libnetwork.

func (NetworkTypeError) Error

func (nt NetworkTypeError) Error() string

func (NetworkTypeError) NotFound

func (nt NetworkTypeError) NotFound()

NotFound denotes the type of this error

type NetworkWalker

type NetworkWalker func(nw Network) bool

NetworkWalker is a client provided function which will be used to walk the Networks. When the function returns true, the walk will stop.

type UnknownEndpointError

type UnknownEndpointError struct {
	// contains filtered or unexported fields
}

UnknownEndpointError is returned when libnetwork could not find in it's database an endpoint with the same name and id.

func (*UnknownEndpointError) Error

func (uee *UnknownEndpointError) Error() string

func (*UnknownEndpointError) NotFound

func (uee *UnknownEndpointError) NotFound()

NotFound denotes the type of this error

type UnknownNetworkError

type UnknownNetworkError struct {
	// contains filtered or unexported fields
}

UnknownNetworkError is returned when libnetwork could not find in it's database a network with the same name and id.

func (*UnknownNetworkError) Error

func (une *UnknownNetworkError) Error() string

func (*UnknownNetworkError) NotFound

func (une *UnknownNetworkError) NotFound()

NotFound denotes the type of this error

Directories

Path Synopsis
Package bitseq provides a structure and utilities for representing long bitmask as sequence of run-lenght encoded blocks.
Package bitseq provides a structure and utilities for representing long bitmask as sequence of run-lenght encoded blocks.
cmd
drivers
Package idm manages resevation/release of numerical ids from a configured set of contiguos ids
Package idm manages resevation/release of numerical ids from a configured set of contiguos ids
Package ipallocator defines the default IP allocator.
Package ipallocator defines the default IP allocator.
Package ipam that specifies the contract the IPAM plugin need to satisfy, decoupling IPAM interface and implementation.
Package ipam that specifies the contract the IPAM plugin need to satisfy, decoupling IPAM interface and implementation.
Package options provides a way to pass unstructured sets of options to a component expecting a strongly-typed configuration structure.
Package options provides a way to pass unstructured sets of options to a component expecting a strongly-typed configuration structure.
Package resolvconf provides utility code to query and update DNS configuration in /etc/resolv.conf
Package resolvconf provides utility code to query and update DNS configuration in /etc/resolv.conf
dns
Package types contains types that are common across libnetwork project
Package types contains types that are common across libnetwork project

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