October 1, 2023


Technology Room

What Is Envoy Gateway, and Why Is It Required for Kubernetes?

3 min read

Envoy proxy, the information airplane of Istio service mesh, is used for dealing with east-west site visitors ( service-to-service communication inside an information middle). Nevertheless, to make Istio handle a community of multicloud functions, Envoy was configured as a sidecar proxy for dealing with north-south site visitors (site visitors out and in of knowledge facilities).

It was noticed that software builders discovered it tough to configure Envoy proxy as an API gateway and ingress controller. This was time-consuming, which led the neighborhood to make use of Kubernetes Gateway API as part of the Envoy mission and ultimately construct Envoy Gateway.

The mission was began by a number of neighborhood members — Matt Kleint (founding father of Envoy at Lyft), Ambassador Labs, Fidelity Investments, Tetrate, and VMware. The neighborhood has merged a number of CNCF tasks, akin to Contour, Emissary, and K8s Gateway API, into Envoy Gateway to supply seamless onboarding.

Introducing Envoy Gateway

Envoy Gateway empowers builders to increase Envoy proxy as an API or ingress controller for multi-cluster and multi-cloud site visitors dealing with use instances. Envoy Gateway may also act because the management airplane to handle Envoy proxies within the cloud functions.

Options of Envoy Gateway

Six key options of Envoy Gateway are:

  1. An API, primarily based on Gateway API with Envoy extensions, to deal with north-south site visitors.
  2. Superior load balancing and site visitors administration capabilities
  3. XDS management airplane for service discovery.
  4. Provisioning and dynamic configuration updates for Envoy proxy and ingress
  5. Prolonged assist for multi-cloud and VMS
  6. TLS certificates delegation

Envoy Gateway presents a number of options that make it interesting for numerous groups; e.g., builders can use Envoy Gateway as API for lighter use instances. As well as, ops or infrastructure groups can use Envoy Gateway to keep up the fleet of Envoy proxy in a service mesh.

Structure of Envoy Gateway

Envoy gateway supplies a management airplane (similar to Istio) to handle the fleet of Envoy proxies and supplies light-weight API use instances. The varied parts contained in the Envoy Gateway are:

  • Supplier: An infrastructure part that Envoy Gateway calls to determine the runtime (or dynamic) configuration, resolve companies, and many others. At the moment, the supplier solely helps Kubernetes.
  • Useful resource Watcher: A part that watches sources used to determine and keep Envoy Gateway’s dynamic configuration.
  • Useful resource Translator: A part answerable for translating the configuration sources from useful resource watcher into Infrastructure or xDS sources.
  • Intermediate Illustration (IR): Used for outlining inside knowledge fashions that exterior sources are translated into to decouple Envoy Gateway from the exterior sources used for dynamic configuration. It consists of two sub-components — Infra IR and xDS IR. The Infra IR is used because the definition of the managed knowledge airplane and enter for Infra Supervisor. However, xDS IR is used to outline the xDS configurations and as an enter to xDS Translator.
  • xDS Translator: Converts the inputs (configuration) from xDS IR into xDS sources for xDS Server.
  • xDS Server: A management airplane to implement the xDS server protocol and configure the information airplane.
  • Infra Supervisor: Manages all of the infrastructure required to run the Envoy proxies within the knowledge airplane and to implement management airplane functionalities akin to integration of Gateway and managed proxies.

Envoy Gateway architecture

Supply: gateway.envoyproxy.io

Benefits of Envoy Gateway

  • Improved developer expertise: With the flexibility to get began with Envoy as API and ingress controller native to Kubernetes and Istio, builders don’t need to spend any effort growing or extending Envoy. Additionally, builders don’t want one other piece of software program (not native to Istio), akin to NGINX or HAProxy.
  • Much less time to keep up Envoy: Infra and ops workforce can robotically use Envoy Gateway to carry out lifecycle administration performance that provisions controller sources, management airplane sources, proxy situations, and many others.
  • Simple migration from Contour and Emissary: Since Envoy Gateway is constructed on the highest of the open-source mission — Contour and Emissary — the neighborhood will make sure the customers can simply migrate to Envoy Gateway with none trouble.

Video: Implementing Envoy API Gateway in Kubernetes

Watch the next video to see a demo on deploying Envoy API Gateway for a Kubernetes cluster.

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