Service Mesh Interface (SMI) is an open source specification for interoperable service meshes on Kubernetes. Launched in May 2019 and donated to the CNCF in March 2020, SMI encourages an open source, vendor-neutral service mesh ecosystem. SMI brings the cloud native community together with a standard which enables innovation by providing a common abstraction that anyone can build against. Join CNCF Ambassador Lachie Evenson (Microsoft) and SMI maintainers Thomas Rampelberg (Buoyant) and Stefan Prodan (Weaveworks) for a conversation on topics like what the spec covers and how it empowers end users to build upon ecosystem tools without needing to re-implement the underlying substrate.
Lachie Evenson, Principal Program Manager @Microsoft
Thomas Rampelberg, Software Engineer @Buoyant
Stefan Prodan, DX Engineer @Weaveworks
Over the last 10 years, the rapid adoption of microservices architecture has resulted in enterprises with hundreds or (sometimes even thousands) of services. With the growth of containerization technologies like Docker and Kubernetes, microservice patterns have seen the strongest growth; resulting in a complex dependency matrix between these micro-services. For teams to monitor, support, and to maintain these services is becoming a challenge so most enterprises have invested in some kind of microservices management tool.
This article will explore some of the common aspects of microservice management. Then we’ll take a closer look at the centralized gateway pattern, as well as its limitations (most enterprises have started with or currently still use this pattern). Then we will look into a new pattern called “Service Mesh” which has gained a lot of attention in the last 3–4 years. Often this pattern is also referred to as the “Side Car Proxy”. So lets get started!
As enterprises start building more and more microservices, it’s becoming clear that some of the aspects of microservices are common across all microservices. So it makes sense to provide a common platform for managing these common aspects. Below are some of the key common aspects:
Service Registration and Discovery: A commonplace to register, document, search and discover microservices
Service Version Management: Ability to run multiple versions of a microservice.
**Authentication and Authorization: **Handle authentication and authorization including Mutual TLS (MTLS) between services.
Service Observability: Ability to monitor end to end traffic between services, response times, and quickly identify failures and bottlenecks.
**Rate Limiting: **Define threshold limits that traffic services can handle.
Circuit Breaker: Ability to configure and introduce a circuit breaker in case of failure scenarios (to avoid flooding downstream services with requests).
**Retry Logic: **Ability to configure and introduce retry logic dynamically in services.
So it’s a good idea to build these concerns as part of a common framework or service management tool. As a result, micro-service development teams don’t have to build these aspects in the service itself.
#service-mesh #istio-service-mesh #microservices #gateway-service #envoy-proxy
Microsoft’s Open Service Mesh is an SMI-compliant, lightweight service mesh being run as an open source project. Backed by service-mesh partners including HashiCorp, Solo.io, and Buoyant, Microsoft introduced the Service Mesh Interface last year with the goal of helping end users and software vendors work with the myriad choices presented by service mesh technology by providing a set of specification standards. OSM can be considered as a reference implementation of SMI, one that builds on existing service mesh components and concepts.
Open Service Mesh data plane is architecturally based on the Envoy proxy and implements the go-control-plane xDS v3 API. However, despite the fact that Envoy comes with OSM by default, using standard interfaces allows it to be integrated with other reverse proxies (compatible with xDS).
SMI follows in the footsteps of existing Kubernetes resources, like Ingress and Network Policy, which also do not provide an implementation where required interfaces to interact with Kubernetes are facilitated for providers to plug their products. The SMI specification instead defines a set of common APIs that allow mesh providers to deliver their own implementations. This means mesh providers can either use SMI APIs directly or build operators to translate SMI to native APIs.
With OSM, users can use SMI and Envoy on Kubernetes and get a simplified service-mesh implementation. The SMI ecosystem already has multiple providers like Istio, Linkerd, Consul Connect, now Open Service Mesh etc. some of them have implemented SMI compatibility using adaptors (Istio, Consul Connect) and others (OSM, Linkerd etc.) consume the SMI APIs directly.
OSM implementation is very similar to Linkerd which also directly consumes SMI APIs without any need for an adaptor like Istio, but one key difference is that OSM uses Envoy for its proxy and communication bus, whereas Linkerd uses linkerd2-proxy (rust based — lighter than Envoy).
OSM control plane comprise four core components. All these four components are implemented as a single controller entity (Kubernetes pod/deployment), this is much lighter in weight when compared with older versions of Istio where there are 4 control plane components (Istio-1.6 introduced istiod which unifies all the control plane components into one binary).
OSM Architecture — Components
OSM Data Plane — Uses Envoy as reverse-proxy by default — similar to most other Service Mesh providers (Linkerd is unique in this case which uses ultralight transparent proxy written in Rust). While by default OSM ships with Envoy, the design utilizes interfaces (An interface type in Go is kind of definition. It defines and describes the exact methods that some other type must have), which enable integrations with any xDS compatible reverse-proxy. The dynamic configuration of all the proxies is handled by OSM controller using Envoy xDS go-control-plane.
#service-mesh #istio-service-mesh #kubernetes #azure #microsoft
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We are pleased to introduce a development release of NGINX Service Mesh (NSM), a fully integrated lightweight service mesh that leverages a data plane powered by NGINX Plus to manage container traffic in Kubernetes environments. NSM is available for free download. We hope you will try it out in your development and test environments, and look forward to your feedback on GitHub.
Adopting microservices methodologies comes with challenges as deployments scale and become more complex. Communication between the services is intricate, debugging problems can be harder, and more services imply more resources to manage.
NSM addresses these challenges by enabling you to centrally provision:
NSM secures applications in a zero‑trust environment by seamlessly applying encryption and authentication to container traffic. It delivers observability and insights into transactions to help organizations deploy and troubleshoot problems quickly and accurately. It also provides fine‑grained traffic control, enabling DevOps teams to deploy and optimize application components while empowering Dev teams to build and easily connect their distributed applications.
NSM consists of a unified data plane for east‑west (service-to-service) traffic and a native integration of the NGINX Plus Ingress Controller for north‑south traffic, managed by a single control plane.
The control plane is designed and optimized for the NGINX Plus data plane and defines the traffic management rules that are distributed to the NGINX Plus sidecars.
#blog #service mesh #nginx service mesh
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