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Currently the libnetwork function `NewNetwork` does not allow caller to pass a network ID and it is always generated internally. This is sufficient for engine use. But it doesn't satisfy the needs of libnetwork being used as an independent library in programs other than the engine. This enhancement is one of the many needed to facilitate a generic libnetwork. Signed-off-by: Jana Radhakrishnan <mrjana@docker.com>
89 lines
3.3 KiB
Markdown
89 lines
3.3 KiB
Markdown
# libnetwork - networking for containers
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[](https://circleci.com/gh/docker/libnetwork/tree/master) [](https://coveralls.io/r/docker/libnetwork) [](https://godoc.org/github.com/docker/libnetwork)
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Libnetwork provides a native Go implementation for connecting containers
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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.
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#### Design
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Please refer to the [design](docs/design.md) for more information.
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#### Using libnetwork
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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.
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```go
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func main() {
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if reexec.Init() {
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return
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}
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// Select and configure the network driver
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networkType := "bridge"
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// Create a new controller instance
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driverOptions := options.Generic{}
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genericOption := make(map[string]interface{})
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genericOption[netlabel.GenericData] = driverOptions
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controller, err := libnetwork.New(config.OptionDriverConfig(networkType, genericOption))
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if err != nil {
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log.Fatalf("libnetwork.New: %s", err)
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}
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// Create a network for containers to join.
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// NewNetwork accepts Variadic optional arguments that libnetwork and Drivers can use.
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network, err := controller.NewNetwork(networkType, "network1", "")
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if err != nil {
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log.Fatalf("controller.NewNetwork: %s", err)
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}
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// For each new container: allocate IP and interfaces. The returned network
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// settings will be used for container infos (inspect and such), as well as
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// iptables rules for port publishing. This info is contained or accessible
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// from the returned endpoint.
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ep, err := network.CreateEndpoint("Endpoint1")
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if err != nil {
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log.Fatalf("network.CreateEndpoint: %s", err)
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}
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// Create the sandbox for the container.
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// NewSandbox accepts Variadic optional arguments which libnetwork can use.
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sbx, err := controller.NewSandbox("container1",
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libnetwork.OptionHostname("test"),
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libnetwork.OptionDomainname("docker.io"))
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if err != nil {
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log.Fatalf("controller.NewSandbox: %s", err)
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}
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// A sandbox can join the endpoint via the join api.
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err = ep.Join(sbx)
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if err != nil {
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log.Fatalf("ep.Join: %s", err)
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}
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// libnetwork client can check the endpoint's operational data via the Info() API
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epInfo, err := ep.DriverInfo()
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if err != nil {
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log.Fatalf("ep.DriverInfo: %s", err)
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}
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macAddress, ok := epInfo[netlabel.MacAddress]
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if !ok {
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log.Fatalf("failed to get mac address from endpoint info")
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}
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fmt.Printf("Joined endpoint %s (%s) to sandbox %s (%s)\n", ep.Name(), macAddress, sbx.ContainerID(), sbx.Key())
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}
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```
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## Future
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Please refer to [roadmap](ROADMAP.md) for more information.
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## Contributing
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Want to hack on libnetwork? [Docker's contributions guidelines](https://github.com/docker/docker/blob/master/CONTRIBUTING.md) apply.
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## Copyright and license
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Code and documentation copyright 2015 Docker, inc. Code released under the Apache 2.0 license. Docs released under Creative commons.
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