DevopsCube

👋 Hi! I’m Bibin Wilson. In each edition, I share practical tips, guides, and the latest trends in DevOps and MLOps to make your day-to-day DevOps tasks more efficient. If someone forwarded this email to you, you can subscribe here to never miss out! ✉️ In Today’s Newsletter In todays deep dive, I break down everything about Kubernetes Swap.

If you want to know about the best DevOps tools in one place, then you’ll love this (updated) listicle. As DevOps engineers, it is very important to know about the DevOps tools landscape. Each project has different requirements, and the right set of tools should be used for a better DevOps implementation. I have organized the tools under different categories. Also, don't feel overwhelmed with 145 tools.

In this podman tutorial for beginners, I will walk you through step-by-step guides to get started with podman and explore all Podman functionalities. When we talk about containers, the default tool which comes to our mind is Docker. But there have been so many developments in container space after the inception of Docker, particularly on container security. And one of the projects which address the security concerns is Podman. Here is what you will learn from this guide. What is Podman?

I had a use case to create a Docker image that supports multiple architectures. In this blog I have added steps to build the image for multiple architectures (amd64 , arm etc) using simple buildx method. Issue If you try to pull the Docker image that doesn't support all architectures, you will get the following error.

In this comprehensive blog, I have shared detailed Terraform module development best practices. Whether you're creating modules for your team or contributing to open-source projects, these tips will help you write clean, reusable, and easy-to-maintain infrastructure code. By the end of this guide, you will have learned: How to build reusable and well-structured Terraform modules. Best practices for naming, inputs, outputs, and file organization.

In this step-by-step guide, you will learn to setup a self-hosted Pritunl VPN in an AWS EC2 instance. By the end of this guide, you will learn: How to install and configure Pritunl How to create and set up VPN users (clients) How to connect and authenticate users using a VPN client app How to configure split tunneling to route only AWS traffic through the VPN 💡 Pritunl is a free, open-source VPN (Virtual Private Network) server that helps you create secure client to site self-hosted VPN solution.

In this blog, we will look into AppArmor, a key Linux security concept. We will look at, What is AppArmor? Example Use case AppArmor & Mandatory Access Control (MAC) How Does AppArmor Work (Hands on Example) AppArmor in Container Runtimes AppArmor is widely used in containers and Kubernetes. Also an important topic for the CKS certification. We'll break it down with a practical example to help you understand how it works. What is AppArmor?

In this blog, we will look into Linux System Calls, frequently discussed in DevOps and SRE interviews, especially in top product companies. Not everyone in DevOps gets to work with system internals or troubleshoot performance issues daily. Even in my 12+ years of DevOps career, I spent 80% of the time in design and implementation and 20% in troubleshooting issues. It totally depends on the job nature and the projects you choose to work on.

In this blog, we will look a little deeper into Linux Capabilities to understand how they relate to containers and Kubernetes using practical examples. By the end of the guide, you will understand What Are Linux Capabilities? Linux Capabilities in Containers Adding Linux Capabilities in Kubernetes pods Anaalyzing Capabilities using systemd In our container non-root blog, I mentioned the concepts of Linux Capabilities.

In this blog, we’ll explore split-brain scenario with real world practical examples. We will look at quorum concepts, and a practical example of how etcd prevents split brain scenario using the Raft consensus algorithm. I’ll also share a real-world experience with GlusterFS split-brain and the lessons learned.