65 lines
3.7 KiB
Text
65 lines
3.7 KiB
Text
== linkerd Proposal
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*Name of project:* linkerd
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*Description:* Linkerd is an open source service mesh for cloud-native applications. It is a layer 5/7 proxy that provides fully decentralized request-level reliability and optimization to service communication, including latency-aware load balancing, retries, failure handling, circuit breaking, and deadlines. It provides granular metrics (both of itself and of downstream services), distributed tracing, TLS, a powerful logical routing layer, and integration with most common service discovery mechanisms.
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Applications use linkerd by proxying HTTP, gRPC, or Thrift calls through a local linkerd instance. In many cases, integration with linkerd is a config change (e.g. setting an http_proxy environment variable) rather than a code change. Linkerd acts as a transparent proxy, and so a call to (e.g. "http://foo/bar") will be routed to the appropriate cluster, resolved in service discovery, load balanced, retried, and returned without application code being aware.
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Linkerd is built on top of Finagle (https://twitter.github.io/finagle/), the high-concurrency RPC library that powers companies like Twitter, Soundcloud, Pinterest, and ING Bank. By staying close to the Finagle codebase, linkerd takes advantage of Finagle's extensive production usage (https://github.com/twitter/finagle/blob/develop/ADOPTERS.md). Linkerd’s primary author is a core contributor to Finagle.
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*Sponsor / Advisor from TOC*: Jonathan Boulle <jonathan.boulle@coreos.com>
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*Unique Identifier*: linkerd
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*License*: Apache License v2.0
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*Maturity Level*: Inception
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*Source control repositories*:
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* https://github.com/linkerd
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*Initial Committers (leads)*:
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* Oliver Gould (Buoyant) [@olix0r]
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* Alex Leong (Buoyant) [@adleong]
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*Infrastructure requirements*: CI and potentially CNCF Community Cluster access. We run integration tests per commit (e.g. testing Kubernetes API integration) and periodic high-volume stress tests.
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*Issue tracker*: https://github.com/linkerd/issues
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*Mailing lists*: https://groups.google.com/forum/#!forum/linkerd-users
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*Website*: https://linkerd.io/
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*Community*: Active & growing!
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* Primarily focused on https://slack.linkerd.io (~400 members)
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* ~1200 GitHub stars
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* ~25 contributors
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*Release methodology and mechanics*: Code review on all changes. Releases triggered manually by developer team. Using pre-1.0 semver semantics.
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*Social media accounts*: Twitter: @linkerd, Slack: http://slack.linkerd.io/
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*Existing sponsorship*: https://buoyant.io/
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*External Dependencies*: Runtime: JVM. Build-time: Finagle, netty
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*Statement on alignment with CNCF mission*:
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Linkerd directly addresses the communications challenges of running microservices at scale, and integrates directly with orchestrated environments such as Kubernetes and DC/OS. Linkerd integrates with two existing CNCF projects: it can use the Kubernetes API directly as a service discovery mechanism, and it exposes metrics in Prometheus format. See this blog post (https://blog.buoyant.io/2016/10/04/a-service-mesh-for-kubernetes-part-i-top-line-service-metrics/) for an example of linkerd, Kubernetes and Prometheus working together.
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*Production Usage*:
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* Monzo: used in production; k8s-based infra (https://monzo.com/blog/2016/09/19/building-a-modern-bank-backend/)
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* NCBI: used in production w/Consul
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* Quid: used in production
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* Douban: used in production
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* Houghton Mifflin Harcourt: used in production; DC/OS-based infra
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* Olark: used in production; k8s-based infra (https://www.youtube.com/watch?v=r0nhQwbe8OY&index=107&list=PLj6h78yzYM2PqgIGU1Qmi8nY7dqn9PCr4)
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*Other Contributors:*
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Currently ~25; >50% non-Buoyant by headcount: https://github.com/BuoyantIO/linkerd/graphs/contributors?type=a
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