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<button id=search-close title="Cancel search" type=reset aria-label="Cancel search"><svg class="icon menu-close"><use xlink:href="/v1.13/img/icons.svg#menu-close"/></svg></button></form></nav></header><div class=banner-container></div><article class=post itemscope itemtype=http://schema.org/BlogPosting><div class=header-content><h1>Extended and Improved WebAssemblyHub to Bring the Power of WebAssembly to Envoy and Istio</h1><p>Community partner tooling of Wasm for Istio by Solo.io.</p></div><p class=post-author>Mar 25, 2020 <span>|</span> By Idit Levine - Solo.io</p><div><p><a href=https://www.solo.io/blog/an-extended-and-improved-webassembly-hub-to-helps-bring-the-power-of-webassembly-to-envoy-and-istio/><em>Originally posted on the Solo.io blog</em></a></p><p>As organizations adopt Envoy-based infrastructure like Istio to help solve challenges with microservices communication, they inevitably find themselves needing to customize some part of that infrastructure to fit within their organization’s constraints. <a href=https://webassembly.org/>WebAssembly (Wasm)</a> has emerged as a safe, secure, and dynamic environment for platform extension.</p><p>In the recent <a href=/v1.13/blog/2020/wasm-announce/>announcement of Istio 1.5</a>, the Istio project lays the foundation for bringing WebAssembly to the popular Envoy proxy. <a href=https://solo.io>Solo.io</a> is collaborating with Google and the Istio community to simplify the overall experience of creating, sharing, and deploying WebAssembly extensions to Envoy and Istio. It wasn’t that long ago that Google and others laid the foundation for containers, and Docker built a great user experience to make it consumable. Similarly, this effort makes Wasm consumable by building the best user experience for WebAssembly on Istio.</p><p>Back in December 2019, Solo.io began an effort to provide a great developer experience for WebAssembly with the announcement of WebAssembly Hub. The WebAssembly Hub allows developers to very quickly spin up a new WebAssembly project in C++ (we’re expanding this language choice, see below), build it using Bazel in Docker, and push it to an OCI-compliant registry. From there, operators had to pull the module, and configure Envoy proxies themselves to load it from disk. Beta support in <a href=https://docs.solo.io/gloo/latest/>Gloo, an API Gateway built on Envoy</a> allows you to declaratively and dynamically load the module, the Solo.io team wanted to bring the same effortless and secure experience to other Envoy-based frameworks as well - like Istio.</p><p>There has been a lot of interest in the innovation in this area, and the Solo.io team has been working hard to further the capabilities of WebAssembly Hub and the workflows it supports. In conjunction with Istio 1.5, Solo.io is thrilled to announce new enhancements to WebAssembly Hub that evolve the viability of WebAssembly with Envoy for production, improve the developer experience, and streamline using Wasm with Envoy in Istio.</p><h2 id=evolving-toward-production>Evolving toward production</h2><p>The Envoy community is working hard to bring Wasm support into the upstream project (right now it lives on a working development fork), with Istio declaring Wasm support an Alpha feature. In <a href=https://www.solo.io/blog/announcing-gloo-1-0-a-production-ready-envoy-based-api-gateway/>Gloo 1.0, we also announced</a> early, non-production support for Wasm. What is Gloo? Gloo is a modern API Gateway and Ingress Controller (built on Envoy Proxy) that supports routing and securing incoming traffic to legacy monoliths, microservices / Kubernetes and serverless functions. Dev and ops teams are able to shape and control traffic patterns from external end users/clients to backend application services. Gloo is a Kubernetes and Istio native ingress gateway.</p><p>Although it’s still maturing in each individual project, there are things that we, as a community, can do to improve the foundation for production support.</p><p>The first area is standardizing what a WebAssembly extension for Envoy looks like. Solo.io, Google, and the Istio community have defined an open specification for bundling and distributing WebAssembly modules as OCI images. This specification provides a powerful model for distributing any type of Wasm module including Envoy extensions.</p><p>This is open to the community - <a href=https://github.com/solo-io/wasm-image-spec>Join in the effort</a></p><p>The next area is improving the experience of deploying Wasm extensions into an Envoy-based framework running in production. In the Kubernetes ecosystem, it is considered a best practice in production to use declarative CRD-based configuration to manage cluster configuration. The new <a href=https://docs.solo.io/web-assembly-hub/latest/tutorial_code/wasme_operator/>WebAssembly Hub Operator</a> adds a single, declarative CRD which automatically deploys and configures Wasm filters to Envoy proxies running inside of a Kubernetes cluster. This operator enables GitOps workflows and cluster automation to manage Wasm filters without human intervention or imperative workflows. We will provide more information about the Operator in an upcoming blog post.</p><p>Lastly, the interactions between developers of Wasm extensions and the teams that deploy them need some kind of role-based access, organization management, and facilities to share, discover, and consume these extensions. The WebAssembly Hub adds team management features like permissions, organizations, user management, sharing, and more.</p><h2 id=improving-the-developer-experience>Improving the developer experience</h2><p>As developers want to target more languages and runtimes, the experience must be kept as simple and as productive as possible. Multi-language support and runtime ABI (Application Binary Interface) targets should be handled automatically in tooling.</p><p>One of the benefits of Wasm is the ability to write modules in many languages. The collaboration between Solo.io and Google provides out-of-the-box support for Envoy filters written in C++, Rust, and AssemblyScript. We will continue to add support for more languages.</p><p>Wasm extensions use the Application Binary Interface (ABI) within the Envoy proxy to which they are deployed. The WebAssembly Hub provides strong ABI versioning guarantees between Envoy, Istio, and Gloo to prevent unpredictable behavior and bugs. All you have to worry about is writing your extension code.</p><p>Lastly, like Docker, the WebAssembly Hub stores and distributes Wasm extensions as OCI images. This makes pushing, pulling, and running extensions as easy as Docker containers. Wasm extension images are versioned and cryptographically secure, making it safe to run extensions locally the same way you would in production. This allows you to build and push as well as trust the source when they pull down and deploy images.</p><h2 id=webassembly-hub-with-istio>WebAssembly Hub with Istio</h2><p>The WebAssembly Hub now fully automates the process of deploying Wasm extensions to Istio, (as well as other Envoy-based frameworks like <a href=https://docs.solo.io/gloo/latest/>Gloo API Gateway</a>) installed in Kubernetes. With this deployment feature, the WebAssembly Hub relieves the operator or end user from having to manually configure the Envoy proxy in their Istio service mesh to use their WebAssembly modules.</p><p>Take a look at the following video to see just how easy it is to get started with WebAssembly and Istio:</p><ul><li><a href="https://www.youtube.com/watch?v=-XPTGXEpUp8">Part 1</a></li><li><a href=https://youtu.be/vuJKRnjh1b8>Part 2</a></li></ul><h2 id=get-started>Get Started</h2><p>We hope that the WebAssembly Hub will become a meeting place for the community to share, discover, and distribute Wasm extensions. By providing a great user experience, we hope to make developing, installing, and running Wasm easier and more rewarding. Join us at the <a href=https://webassemblyhub.io>WebAssembly Hub</a>, share your extensions and <a href=https://slack.solo.io>ideas</a>, and join an <a href=https://solo.zoom.us/webinar/register/WN_i8MiDTIpRxqX-BjnXbj9Xw>upcoming webinar</a>.</p></div><nav class=pagenav><div class=left><a title="Configure the IBM Cloud Kubernetes Service Application Load Balancer to direct traffic to the Istio Ingress gateway with mutual TLS." href=/v1.13/blog/2020/alb-ingress-gateway-iks/ class=next-link><svg class="icon left-arrow"><use xlink:href="/v1.13/img/icons.svg#left-arrow"/></svg>Direct encrypted traffic from IBM Cloud Kubernetes Service Ingress to Istio Ingress Gateway</a></div><div class=right><a title="A mechanism to acquire and share an application certificate and key through mounted files." href=/v1.13/blog/2020/proxy-cert/ class=next-link>Provision a certificate and key for an application without sidecars<svg class="icon right-arrow"><use 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