A Kubernetes service mesh is a dedicated infrastructure layer designed to manage, observe, and control communication between microservices within a Kubernetes cluster. The main goal of a service mesh is to improve the overall reliability, Kubernetes security, and observability of the microservices that make up a complex, distributed application.
There are several popular open source technologies that can be used to implement a service mesh in Kubernetes clusters, including Istio, Linkerd, Consul Connect, and NGINX Service Mesh.
In this article:
Kubernetes is a powerful platform for deploying and managing containerized applications at scale. However, as organizations move towards microservices architectures, the complexity of managing service-to-service communication can become challenging. This is where service mesh can help Kubernetes.
A service mesh can enhance Kubernetes by providing additional capabilities for managing and securing service-to-service communication within the Kubernetes cluster. Here are some ways in which service mesh can help Kubernetes:
Read our blog post: Do You Really Need a Service Mesh?
A Kubernetes service mesh works by providing a dedicated infrastructure layer that manages communication between microservices in a Kubernetes cluster. It uses sidecar proxies, a control plane, and a data plane to enable advanced features like observability, security, and traffic management. Let’s dive deeper into how these components work together.
Each microservice in the Kubernetes cluster is paired with a sidecar proxy, which intercepts and manages all incoming and outgoing network traffic. These proxies are typically implemented using Envoy, a high-performance proxy. When a microservice sends or receives a request, the sidecar proxy handles the communication, abstracting the network complexities away from the microservice itself.
The control plane is responsible for managing the configuration of the sidecar proxies. It provides an API and a set of tools for defining and enforcing policies, such as routing rules, load balancing settings, and security configurations, across the entire service mesh. The control plane also collects telemetry data from the sidecar proxies, allowing operators to monitor and troubleshoot the microservices and their interactions.
The data plane consists of the sidecar proxies that process and forward network traffic between microservices. This layer is responsible for implementing the policies and configurations defined by the control plane, such as routing decisions, load balancing, and security settings.
When a request is made within the Kubernetes cluster, the following steps occur:
By using a service mesh, developers and operators can focus on implementing application logic rather than managing the complexities of inter-service communication. This results in improved observability, security, and resilience for microservices-based applications running on Kubernetes.
The following open source tools can help you implement a service mesh in your Kubernetes clusters.
License: Apache License 2.0
GitHub Repository: https://github.com/istio/istio
Istio is an open-source service mesh platform that helps manage traffic between microservices within a Kubernetes cluster. It provides features such as load balancing, authentication, authorization, rate limiting, and observability.
Istio uses a sidecar proxy (Envoy) that intercepts all incoming and outgoing traffic to handle service-to-service communication. It’s designed to be platform-independent and can be used in various environments like Kubernetes, Mesos, and others.
Read our blog post: How to Build a Service Mesh with Istio and Calico
License: Apache License 2.0
GitHub Repository: https://github.com/linkerd/linkerd2
Linkerd is another open-source service mesh that is focused on simplicity, performance, and security. Developed by Buoyant, Linkerd is designed to be lightweight and easy to use. Like Istio, it utilizes a sidecar proxy model to handle traffic between services.
Linkerd provides features such as load balancing, automatic retries, circuit breaking, and observability. It is part of the Cloud Native Computing Foundation (CNCF) and is built on the Rust-based proxy, Linkerd2-proxy.
License: Mozilla Public License 2.0
GitHub Repository: https://github.com/hashicorp/consul
Consul Connect is a service mesh solution developed by HashiCorp as part of their Consul product, which is a service discovery and configuration tool. Consul Connect extends Consul’s capabilities to provide features such as service segmentation, mutual TLS encryption, and fine-grained access control for microservices.
It can be integrated with Kubernetes, VMs, and bare-metal servers. Consul Connect is designed to be highly scalable and can be used in multi-cloud and multi-platform environments.
License: Apache License 2.0
GitHub Repository: https://github.com/nginxinc/nginx-service-mesh
NGINX Service Mesh is a lightweight, production-ready service mesh solution developed by NGINX (now part of F5 Networks). It’s built on the popular NGINX proxy and is designed to be easy to deploy and manage.
It provides features such as traffic management, security, and observability. NGINX Service Mesh uses a sidecar proxy model and supports integration with other NGINX products, such as NGINX Plus, for additional capabilities.
A service mesh adds operational complexity and introduces an additional control plane for teams to manage. Platform owners, DevOps teams, and SREs have limited resources, so adopting a service mesh is a significant undertaking due to the resources required for configuration and operation.
Calico enables a single-pane-of-glass unified control to address the three most popular service mesh use cases—security, observability, and control—with an operationally simpler approach, while avoiding the complexities associated with deploying a separate, standalone service mesh. With Calico, you can easily achieve full-stack observability and security, deploy highly performant encryption, and tightly integrate with existing security infrastructure like firewalls.
Get updates on blog posts, workshops, certification programs, new releases, and more!