The InfoQ Podcast

Oliver Gould on the Three Pillars of Service Mesh, SMI, and Making Technology Bets


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In this podcast we sit down with Oliver Gould, co-founder and CTO of Buoyant. Oliver has a strong background in networking, architecture and observability, and worked on solving associated technical challenges at both Yahoo! and Twitter. Oliver is a regular presenter at cloud and infrastructure conferences, and alongside his co-founder William Morgan, you can often find them in the hallway track, waxing lyrical about service mesh -- a term they practically coined -- and trying to bring others along on the journey.
Service mesh technology is still young, and the ecosystem is still very much a work in progress, but there have been several recent interesting developments within this space. One of these was the announcement of the service mesh interface (SMI) at the recent KubeCon EU in Barcelona. The SMI spec seeks to unlock service mesh integrators and implementers, as this can provide an abstraction that removes the need to bet on any single service mesh implementation. This can be good for both tool makers and enterprise early adopters. Many organisations like Microsoft and HashiCorp are involved with working alongside the community to help define the SMI, including Buoyant.
In this podcast we summarise the evolution of the service mesh concept, with a focus on the three pillars: visibility, security, and reliability. We explore the new traffic “tap” feature within Linkerd that allows near real time in-situ querying of metrics, and discuss how to implement network security by leveraging the primitives like Service Account provided by Kubernetes. We also discuss how reliability features, such as retries, time outs, and circuit-breakers are becoming table stakes for infrastructure platforms.
We also cover the evolution of the service mesh interface, explore how service meses may impact development and platforms in the future, and briefly discuss some of the benefits offered by the Rust language in relation to building a data plane for Linkerd. We conclude the podcast with a discussion of the importance of community building.
Why listen to this podcast:
- A well-implemented service mesh can make a distributed software system more observable. Linkerd 2.0 supports both the emitting of mesh telemetry for offline analysis, and also the ability to “tap” communications and make queries dynamically against the data. The Linkerd UI currently makes use the tap functionality.
- Linkerd aims to make the implementation of secure service-to-service communication easy, and it does this by leveraging existing Kubernetes primitives. For example, Service Accounts are used to bootstrap the notion of identity, which in turn is used as a basis for Linkerd’s mTLS implementation.
- Offering reliability is “table stakes” for any service mesh. A service mesh should make it easy for platform owners to offer fundamental service-to-service communication reliability to application owners.
- The future of software development platforms may move (back) to more PaaS-like offerings. Kubernetes-based function as a service (FaaS) frameworks like OpenFaaS and Knative are providing interesting features in this space. A service mesh may provide some of the glue for this type of platform.
- Working on the service mesh interface (SMI) specification allowed the Buoyant team to sit down with other community members like HashiCorp and Microsoft, and share ideas and identify commonality between existing service mesh implementations.
More on this: Quick scan our curated show notes on InfoQ https://bit.ly/2m5DSJ6
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