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🌅 Introducing linkerd 🎈
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linkerd is a dynamic linker for distributed applications (aka
"microservices").  In the same way that `ld(1)` binds software
components (libraries), linkerd binds services by mediating
inter-service communication (RPC).

linkerd builds upon finagle & netty--Twitter's JVM networking
stack--and it exposes many of the advanced operational features
developed by Twitter, Soundcloud, and other large internet
applications.

linkerd provides a minimal configuration structure that describes
general rules for linking RPC requests to a service discovery system
(i.e. _namers_).  This configuration system, built on Jackson, exposes
a module system so that additional functionality may be instrumented
at package- or deploy-time.

This repository currently includes only _libraries_ for building
linkerd.  The `linkerd-daemon` package provides a Main that is capable
of initializing linkerd; however, because it does not depend on any of
the protocol or namer modules, it is not suitable to execute this main
without additional build configuration (TBD).

Current protocol support:
- http
- thrift [experimental]
- mux [experimental]

Current namer support:
- file-system based discovery
- kubernetes master [experimental]

linkerd is under active development, and so current APIs should not be
considered stable until the project reaches version 1.0.0.
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70 changes: 70 additions & 0 deletions README.md
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# linkerd #

linkerd is an open-source dynamic linker for microservices. In an
operating system, a dynamic linker handles everything an executable
needs to make library calls. Similarly, for microservice applications,
linkerd handles everything needed to make RPC calls.

linkerd is designed not just to make multi-service applications fast
and reliable (even under extreme traffic) but to decouple application
code from the mechanics of how it’s operationalized.

## Projects ##

### linkerd ###

The _linkerd_ project provides a configuration engine and runtime
harness for routers. `linkerd/core` provides basic public APIs for
configuring and initializing a linker. `linkerd/main` provides a
runtime harness that reads linker configuration from a file.

There are a number of protocol-specific modules that may be
auto-loaded by `linkerd/main`.

### router ###

The _router_ project provides a routing library on top of
[Finagle][0]. The `Router` and `StackRouter` types are much like
Finagle's `Client` and `StackClient` types, except that routers are
not initialized against a specific destination. Instead, a
destination is identified for each request, and this destination may
be refined through finagle's `Namer` API in order to dispatch the
request to a downstream service.

### auxiliary ###

#### k8s ####

The _k8s_ project implements a client for a subset of the
[Kubernetes][1] master API. This package provides the
`io.buoyant.k8s.endpoints` namer that may be used with finagle clients
or routers, independently of _linkerd_.

#### test-util ####

Provides some helpers for writing tests against Finagle's asynchronous
APIs.


## Building ##

[sbt](http://www.scala-sbt.org/) is currently used to build linkerd.
Developers should not use a system-installed version of sbt, and
should instead use the `./sbt` script, which ensures that a compatible
version of sbt is available.

`./sbt compile` builds all components. `./sbt "project linkerd"
compile` compiles only the _linkerd_ projects.

`./sbt test` runs all unit tests.

`./sbt e2e:test` runs end-to-end tests. These tests may bind
servers on ephemeral ports, write temporary files to disk, etc.


## License ##

Copyright 2016, Buoyant Inc. All rights reserved.

[0]: https://twitter.github.io/finagle/
[1]: https://k8s.io/
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