William Morgan, founder of Linkerd service mesh and CEO of Bouyant, discusses sidecars, service mesh, and Kubernetes. They explore the origin of sidecars, difficulties in running sidecar containers in pods, and Kubernetes Enhancement Proposal (KEP) 753. William shares thoughts on service mesh's relevance and discusses the implementation of Kubernetes Admission Policy (KAP).
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Quick takeaways
Sidecar containers in Kubernetes enable dynamic binding and collaboration between main application and additional containers, providing features like logging and monitoring infrastructure.
Utilizing sidecar containers in Kubernetes allows platform teams to handle security, reliability, and observability features, maintaining a uniform approach across different services and teams.
Deep dives
Introduction to Sidecar Containers for Kubernetes
The podcast episode discusses the concept of sidecar containers in Kubernetes. The speaker explains that a sidecar container is a pattern in which a container is added next to the main application container. This pattern allows for dynamic binding and enables different containers to work together in a system like Kubernetes. The speaker provides examples of sidecar use cases, such as logging and monitoring infrastructure. The episode also covers the history of sidecars and service meshes alongside Kubernetes. The speaker emphasizes the importance of workload identity and communication between the main application container and the sidecar container. The episode concludes by highlighting the recent Kubernetes enhancement proposal (KEP) 753, which introduces a new configuration option for sidecar containers in Kubernetes, solving previous issues with jobs and init containers.
Benefits of Using Sidecar Containers in Kubernetes
This segment of the podcast episode explores the benefits of using sidecar containers in Kubernetes. The speaker explains that sidecar containers provide a way to implement features related to security, reliability, and observability without burdening developers. The sidecar containers handle tasks such as mutual TLS encryption, authorization policies, request retries, load balancing, and metrics reporting. The speaker highlights the advantage of having a uniform approach to these features across different services and teams, regardless of the programming language used. By utilizing sidecar containers, the platform team can own these functionalities, allowing developers to focus on other aspects of the application. The episode also mentions the integration of sidecar containers with Kubernetes' network policies for enhanced security and workload identity.
KEP 753: Sidecar Containers in Kubernetes
This part of the podcast episode focuses on Kubernetes enhancement proposal (KEP) 753, which introduces sidecar containers as a new feature in Kubernetes. The speaker describes the changes implemented in KEP 753, including the addition of a 'restart policy always' flag for init containers, which signifies that the container is a sidecar. This new functionality addresses issues with jobs and ensures that sidecar containers terminate when the regular containers in the pod terminate. The episode explains how Kubernetes manages the lifecycle of sidecar containers and the role of the control plane in restarting them if they fail. The speaker clarifies that the sidecar containers are automatically configured by the mutating admission webhook controller in LinkerD, removing the need for manual configuration. The episode concludes by mentioning that KEP 753 will be in beta starting from Kubernetes version 1.29.
Impact and Future of Sidecar Containers in Kubernetes
In this final segment of the podcast episode, the speaker reflects on the impact and future of sidecar containers in Kubernetes. The speaker highlights the significance of sidecar containers in enabling collaboration between platform teams and development teams. Sidecar containers provide a powerful way to merge functionalities without creating unnecessary dependencies. The episode emphasizes the continuing importance of sidecar containers for security, visibility, and operational aspects within a service mesh architecture. The speaker discusses the ongoing developments and contributions to LinkerD, a service mesh project that heavily utilizes sidecar containers. Overall, the episode concludes with optimism about the future of sidecar containers in enhancing the capabilities and flexibility of Kubernetes-based systems.
William Morgan, founder of the Linkerd service mesh and CEO of Bouyant, joins SE Radio’s Robert Blumen for a discussion of sidecars, service mesh, and a forthcoming enhancement to kubernetes to support sidecars natively. The conversation explores the origin of sidecars, sidecars and service mesh, and migrating service mesh to kubernetes. They take a deep dive into some aspects of running service mesh on kubernetes, the difficulties in running a sidecar container in a pod, and Kubernetes Enhancement Proposal (KEP) 753, which is intended to provide better native support for sidecar containers. William also gives some thoughts on the continuing relevance of service mesh.
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