Open source service mesh for cloud-native applications
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adleong 1.4.5 (#2067)
Linkerd 1.4.5 contains some minor bugfixes and introduces two much-requested features. First, it is
now possible to selectively disable Linkerd's admin endpoints, e.g., keep the UI functional but to
disable the shutdown endpoint. A huge thanks to [Robert Panzer]( for
all his hard work on this.

Second, we've added experimental support for the [OpenJ9]( JVM.
Preliminary tests with OpenJ9 exhibit a 3x reduction in startup time, a 40% reduction in memory
footprint, and a 3x reduction in p99 latency. You can find a Linkerd+OpenJ9 Docker image at
`buoyantio/linkerd:1.4.5-openj9-experimental` on
[Docker Hub](

Full release notes:

* Add an OpenJ9 configuration for building a Docker image with the OpenJ9 JVM
* Fix a NullPointerException when using the -validate flag
* Fix an error where diagnostic tracing did not work when receiving a chunk encoded response
* Admin
  * Add a `security` section to the admin config that controls which admin endpoints are enabled
* HTTP/2
  * Fix a memory leak when there are a large number of reset streams
  * Allow HTTP/2 response classifiers to be loaded as plugins
* Namerd
  * Fix a memory leak in the the io.l5d.mesh interpreter when idle services are reaped

Signed-off-by: Alex Leong <>
Latest commit 0280009 Jul 13, 2018
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.circleci Linkerd 1.4.3 (#1987) Jun 13, 2018
.github Add root CODEOWNERS (#1928) May 4, 2018
admin Upgrade Linkerd's Finagle dependency to 18.7.0 (#2063) Jul 12, 2018
ci Add h2load to test script (#1758) Dec 22, 2017
config/src Instrument watches in the io.l5d.namerd interpreter (#1943) May 23, 2018
consul/src Upgrade finagle dependency to 18.6.0 (#2049) Jul 11, 2018
etcd Upgrade finagle dependency to 18.6.0 (#2049) Jul 11, 2018
finagle remove class HTML rendering in comments (#2050) Jul 11, 2018
grpc Improve gRPC cancellation (#2051) Jul 12, 2018
interpreter Improve gRPC cancellation (#2051) Jul 12, 2018
istio-proto/src/main Refactor Istio code before adding Mixer precondition checks (#1403) (#… Oct 12, 2017
istio/src Remove broken links (#1706) Nov 24, 2017
k8s/src Upgrade finagle dependency to 18.6.0 (#2049) Jul 11, 2018
linkerd Pass router param inputs to identifiers (#2056) Jul 13, 2018
marathon/src Upgrade finagle dependency to 18.6.0 (#2049) Jul 11, 2018
mesh Update Delegator interface to return a single value only (#1862) Mar 20, 2018
namer Expose namer state for namers with transformers (#2037) Jul 4, 2018
namerd Upgrade Linkerd's Finagle dependency to 18.7.0 (#2063) Jul 12, 2018
project 1.4.5 (#2067) Jul 13, 2018
router Upgrade to Finagle 18.5.0 and switch from Buf to ByteBuf (#2020) Jul 3, 2018
telemetry Upgrade finagle dependency to 18.6.0 (#2049) Jul 11, 2018
test-util/src/main/scala/io/buoyant/test Install git during circleci setup (#1878) Mar 28, 2018
validator/src/main/scala/io/buoyant/namerd Replace string-interpolation in log messages with sprintf-style loggi… Aug 23, 2017
.gitignore Add protoc script which downloads and runs protoc (#1138) Mar 14, 2017 Add to adopters' list (#2022) Jun 29, 2018 Add buildtime base docker image overwrite guideline (#1867) Mar 16, 2018 1.4.5 (#2067) Jul 13, 2018 Capitalize Linkerd and Namerd in documentation (#1743) Dec 12, 2017
DCO Replace CLA with DCO (#1722) Dec 5, 2017 add and demarcate super-maintainers (#1813) Feb 15, 2018 Capitalize Linkerd and Namerd in documentation (#1743) Dec 12, 2017
LICENSE 🌅 Introducing linkerd 🎈 Jan 13, 2016 Add @ccmtaylor to (#1857) Mar 15, 2018 Capitalize Linkerd and Namerd in documentation (#1743) Dec 12, 2017 fix copyright in README (#1866) Mar 15, 2018
protoc Remove echo statement from protoc script (#1380) Jun 12, 2017
sbt 🌅 Introducing linkerd 🎈 Jan 13, 2016


GitHub license Circle CI Slack Status Docker Pulls CII Best Practices

🎈 Welcome to Linkerd! 👋

Linkerd is a transparent service mesh, designed to make modern applications safe and sane by transparently adding service discovery, load balancing, failure handling, instrumentation, and routing to all inter-service communication.

Linkerd (pronouned "linker-DEE") acts as a transparent HTTP/gRPC/thrift/etc proxy, and can usually be dropped into existing applications with a minimum of configuration, regardless of what language they're written in. It works with many common protocols and service discovery backends, including scheduled environments like Mesos and Kubernetes.

Linkerd is built on top of Netty and Finagle, a production-tested RPC framework used by high-traffic companies like Twitter, Pinterest, Tumblr, PagerDuty, and others.

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

Want to try it?

We distribute binaries which you can download from the Linkerd releases page. We also publish Docker images for each release, which you can find on Docker Hub.

For instructions on how to configure and run Linkerd, see the user documentation on

Working in this repo includes general information on how to work in this repo. Additionally, there are documents on how to build several of the application subprojects:

  • linkerd -- produces linkerd router artifacts
  • namerd -- produces namerd service discovery artifacts
  • grpc -- produces the protoc-gen-io.buoyant.grpc code generator

We ❤️ pull requests! See for info on contributing changes.

Related Repos

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.


Copyright 2018, Linkerd 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.