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A service mesh for Kubernetes and beyond. Proxy repo for Linkerd 2.x.
Branch: master
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olix0r metrics: Classify response errors (#269)
The metrics layer did not properly count response errors.

This change makes a response status code optional so that response
errors may be counted when no status code is present.

Fixes linkerd/linkerd2#2934
Latest commit 35df8ab Jun 13, 2019


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This repo contains the transparent proxy component of Linkerd2. While the Linkerd2 proxy is heavily influenced by the Linkerd 1.X proxy, it comprises an entirely new codebase implemented in the Rust programming language.

This proxy's features include:

  • Transparent, zero-config proxying for HTTP, HTTP/2, and arbitrary TCP protocols.
  • Automatic Prometheus metrics export for HTTP and TCP traffic;
  • Transparent, zero-config WebSocket proxying;
  • Automatic, latency-aware, layer-7 load balancing;
  • Automatic layer-4 load balancing for non-HTTP traffic;
  • Automatic TLS (experimental);
  • An on-demand diagnostic tap API.

This proxy is primarily intended to run on Linux in containerized environments like Kubernetes, though it may also work on other Unix-like systems (like macOS).

The proxy supports service discovery via DNS and the linkerd2 Destination gRPC API.

The Linkerd project is hosted by the Cloud Native Computing Foundation (CNCF).

Building the project

A Makefile is provided to automate most build tasks. It provides the following targets:

  • make build -- Compiles the proxy on your local system using cargo
  • make clean -- Cleans the build target on the local system using cargo clean
  • make test -- Runs unit and integration tests on your local system using cargo
  • make test-flakey -- Runs all tests, including those that may fail spuriously
  • make package -- Builds a tarball at target/release/linkerd2-proxy-${PACKAGE_VERSION}.tar.gz. If PACKAGE_VERSION is not set in the environment, the local git SHA is used.
  • make docker -- Builds a Docker container image that can be used for testing. If the DOCKER_TAG environment variable is set, the image is given this name. Otherwise, the image is not named.


Usually, Cargo, Rust's package manager, is used to build and test this project. If you don't have Cargo installed, we suggest getting it via


Each version of the master branch is published to$PACKAGE_VERSION.tar.gz. The most recent version (and the package's SHA256 sum) can be discovered via:

:; curl

The SHA256 sum of each package version is found at:


Code of conduct

This project is for everyone. We ask that our users and contributors take a few minutes to review our code of conduct.


linkerd2-proxy is copyright 2018 the linkerd2-proxy authors. All rights reserved.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use these files except in compliance with the License. You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

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