Architecure Evolution & DevOpts

  In the rapidly evolving world of container orchestration, Kubernetes has emerged as the go-to platform for deploying, scaling, and managing containerized applications. One of the unsung heroes enabling the seamless operation of these containers is the Overlay filesystem (OverlayFS). In this blog post, we will explore the role and importance of the Overlay filesystem in the Kubernetes context. What is OverlayFS? OverlayFS is a type of union filesystem that allows multiple filesystems to be overlaid, creating a single, unified view. It enables efficient storage management by stacking layers of filesystems, where changes can be written to an upper layer while the lower layers remain unchanged. This mechanism is particularly beneficial in containerized environments where applications often share common base images. Why OverlayFS Matters in Kubernetes Kubernetes, as a container orchestration platform, relies on container runtimes like Docker, containerd, and CRI-O to manage the lifecy...

Kubernetes has revolutionized the way we deploy, scale, and manage containerized applications. A critical aspect of this orchestration platform is its robust networking capabilities, which ensure seamless communication between containers, services, and external systems. One of the key components enabling these networking features is the br_netfilter kernel module. In this blog post, we'll dive into what br_netfilter is, its role in Kubernetes, and why it is essential for maintaining secure and efficient network operations in a Kubernetes cluster. What is br_netfilter? br_netfilter is a kernel module that enables packet filtering on network bridge devices. It integrates with the netfilter framework, which provides hooks to manage and manipulate network packets in the Linux kernel. Essentially, br_netfilter allows the iptables rules to be applied to traffic that is passing through a Linux bridge, enabling enhanced network security and traffic management. Netfilter ships with 5 ho...

  Microservices have become a popular architecture pattern, enabling developers to build and deploy small, independent services that can communicate with each other. Spring Boot is an excellent framework for developing microservices due to its simplicity and ease of use. Coupling Spring Boot with Swagger allows you to create robust APIs that are well-documented and easy to test. In this article, we'll walk through the steps to create a simple microservice with Spring Boot and Swagger. springdoc-openapi-javadoc and Swagger are closely related in the context of API documentation for Spring Boot applications. Here's a breakdown of their relationship and how they work together: Swagger and OpenAPI Swagger : Originally developed by SmartBear, Swagger is a set of open-source tools built around the OpenAPI Specification (OAS), which allows developers to design, build, document, and consume REST APIs. OpenAPI : The OpenAPI Specification is a standard for defining APIs, which was based...