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https://github.com/emissary-ingress/emissary

open source Kubernetes-native API gateway for microservices built on the Envoy Proxy
https://github.com/emissary-ingress/emissary

ambassador api-gateway api-management cloud-native docker envoy envoy-proxy gateway-api kubernetes kubernetes-annotations kubernetes-ingress microservice

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open source Kubernetes-native API gateway for microservices built on the Envoy Proxy

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Emissary-ingress

================



[![Version][badge-version-img]][badge-version-link]

[![Docker Repository][badge-docker-img]][badge-docker-link]

[![Join Slack][badge-slack-img]][badge-slack-link]

[![Core Infrastructure Initiative: Best Practices][badge-cii-img]][badge-cii-link]

[![Artifact HUB][badge-artifacthub-img]][badge-artifacthub-link]



[badge-version-img]: https://img.shields.io/docker/v/emissaryingress/emissary?sort=semver

[badge-version-link]: https://github.com/emissary-ingress/emissary/releases

[badge-docker-img]: https://img.shields.io/docker/pulls/emissaryingress/emissary

[badge-docker-link]: https://hub.docker.com/r/emissaryingress/emissary

[badge-slack-img]: https://img.shields.io/badge/slack-join-orange.svg

[badge-slack-link]: https://communityinviter.com/apps/cloud-native/cncf

[badge-cii-img]: https://bestpractices.coreinfrastructure.org/projects/1852/badge

[badge-cii-link]: https://bestpractices.coreinfrastructure.org/projects/1852

[badge-artifacthub-img]: https://img.shields.io/endpoint?url=https://artifacthub.io/badge/repository/emissary-ingress

[badge-artifacthub-link]: https://artifacthub.io/packages/helm/datawire/emissary-ingress



[Emissary-Ingress](https://www.getambassador.io/docs/open-source) is an open-source Kubernetes-native API Gateway +

Layer 7 load balancer + Kubernetes Ingress built on [Envoy Proxy](https://www.envoyproxy.io).

Emissary-ingress is a CNCF incubation project (and was formerly known as Ambassador API Gateway).



Emissary-ingress enables its users to:

* Manage ingress traffic with [load balancing], support for multiple protocols ([gRPC and HTTP/2], [TCP], and [web sockets]), and Kubernetes integration

* Manage changes to routing with an easy to use declarative policy engine and [self-service configuration], via Kubernetes [CRDs] or annotations

* Secure microservices with [authentication], [rate limiting], and [TLS]

* Ensure high availability with [sticky sessions], [rate limiting], and [circuit breaking]

* Leverage observability with integrations with [Grafana], [Prometheus], and [Datadog], and comprehensive [metrics] support

* Enable progressive delivery with [canary releases]

* Connect service meshes including [Consul], [Linkerd], and [Istio]

* [Knative serverless integration]



See the full list of [features](https://www.getambassador.io/docs/emissary) here.



Branches

========



(If you are looking at this list on a branch other than `master`, it

may be out of date.)



- [`master`](https://github.com/emissary-ingress/emissary/tree/master) - branch for Emissary-ingress dev work ( :heavy_check_mark: upcoming release)

- [`release/v3.9`](https://github.com/emissary-ingress/emissary/tree/release/v3.9) - branch for Emissary-ingress 3.9.z work

- [`release/v2.5`](https://github.com/emissary-ingress/emissary/tree/release/v2.5) - branch for Emissary-ingress 2.5.z work ( :heavy_check_mark: maintenance)



Architecture

============



Emissary is configured via Kubernetes CRDs, or via annotations on Kubernetes `Service`s. Internally,

it uses the [Envoy Proxy] to actually handle routing data; externally, it relies on Kubernetes for

scaling and resiliency. For more on Emissary's architecture and motivation, read [this blog post](https://blog.getambassador.io/building-ambassador-an-open-source-api-gateway-on-kubernetes-and-envoy-ed01ed520844).



Getting Started

===============



You can get Emissary up and running in just three steps. Follow the instructions here: https://www.getambassador.io/docs/emissary/latest/tutorials/getting-started/



If you are looking for a Kubernetes ingress controller, Emissary provides a superset of the functionality of a typical ingress controller. (It does the traditional routing, and layers on a raft of configuration options.) This blog post covers [Kubernetes ingress](https://blog.getambassador.io/kubernetes-ingress-nodeport-load-balancers-and-ingress-controllers-6e29f1c44f2d).



For other common questions, view this [FAQ page](https://www.getambassador.io/docs/emissary/latest/about/faq/).



You can also use Helm to install Emissary. For more information, see the instructions in the [Helm installation documentation](https://www.getambassador.io/docs/emissary/latest/topics/install/helm/)



Check out the full [Emissary

documentation](https://www.getambassador.io/docs/emissary/) at

www.getambassador.io/docs/open-source.



Community

=========



Emissary-ingress is a CNCF Incubating project and welcomes any and all

contributors.



Check out the [`Community/`](Community/) directory for information on

the way the community is run, including:



 - the [`CODE_OF_CONDUCT.md`](Community/CODE_OF_CONDUCT.md)

 - the [`GOVERNANCE.md`](Community/GOVERNANCE.md) structure

 - the list of [`MAINTAINERS.md`](Community/MAINTAINERS.md)

 - the [`MEETING_SCHEDULE.md`](Community/MEETING_SCHEDULE.md) of

   regular trouble-shooting meetings and contributor meetings

 - how to get [`SUPPORT.md`](Community/SUPPORT.md).



The best way to join the community is to join the [CNCF Slack](https://communityinviter.com/apps/cloud-native/cncf)

#emissary-ingress channel.



Check out the [`DevDocumentation/`](DevDocumentation/) directory for

information on the technicals of Emissary, most notably the

[`CONTRIBUTING.md`](DevDocumentation/CONTRIBUTING.md) contributor's guide.



If you're interested in contributing, here are some ways:

* Write a blog post for [our blog](https://blog.getambassador.io)

* Investigate an [open issue](https://github.com/emissary-ingress/emissary/issues)

* Add [more tests](https://github.com/emissary-ingress/emissary/tree/master/ambassador/tests)



The Ambassador Edge Stack is a superset of Emissary-ingress that provides additional functionality including OAuth/OpenID Connect, advanced rate limiting, Swagger/OpenAPI support, integrated ACME support for automatic TLS certificate management, and a cloud-based UI. For more information, visit https://www.getambassador.io/editions/.



[authentication]: https://www.getambassador.io/docs/emissary/latest/topics/running/services/auth-service/

[canary releases]: https://www.getambassador.io/docs/emissary/latest/topics/using/canary/

[circuit breaking]: https://www.getambassador.io/docs/emissary/latest/topics/using/circuit-breakers/

[Consul]: https://www.getambassador.io/docs/emissary/latest/howtos/consul/

[CRDs]: https://kubernetes.io/docs/concepts/extend-kubernetes/api-extension/custom-resources/

[Datadog]: https://www.getambassador.io/docs/emissary/latest/topics/running/statistics/#datadog

[Grafana]: https://www.getambassador.io/docs/emissary/latest/topics/running/statistics/#grafana

[gRPC and HTTP/2]: https://www.getambassador.io/docs/emissary/latest/howtos/grpc/

[Istio]: https://www.getambassador.io/docs/emissary/latest/howtos/istio/

[Knative serverless integration]: https://www.getambassador.io/docs/emissary/latest/howtos/knative/

[Linkerd]: https://www.getambassador.io/docs/emissary/latest/howtos/linkerd2/

[load balancing]: https://www.getambassador.io/docs/emissary/latest/topics/running/load-balancer/

[metrics]: https://www.getambassador.io/docs/emissary/latest/topics/running/statistics/

[Prometheus]: https://www.getambassador.io/docs/emissary/latest/topics/running/statistics/#prometheus

[rate limiting]: https://www.getambassador.io/docs/emissary/latest/topics/running/services/rate-limit-service/

[self-service configuration]: https://www.getambassador.io/docs/emissary/latest/topics/using/mappings/

[sticky sessions]: https://www.getambassador.io/docs/emissary/latest/topics/running/load-balancer/#sticky-sessions--session-affinity

[TCP]: https://www.getambassador.io/docs/emissary/latest/topics/using/tcpmappings/

[TLS]: https://www.getambassador.io/docs/emissary/latest/howtos/tls-termination/

[web sockets]: https://www.getambassador.io/docs/emissary/latest/topics/using/tcpmappings/