Category: IT Security

“Docker is dead!” In late 2020, when this news spread, the community fell into a panic. But what actually happened? > 🎯 What this article covers Why Kubernetes excluded Docker (the real reasons) What dockershim is and why it became a problem What alternative runtimes like containerd, CRI-O are Whether Docker images (docker build) can…

If your monthly bill makes your eyes pop, you’re not alone. Token waste is everyone’s problem. > 🎯 What This Article Covers How tokens are precisely billed (input vs. output differences) How to reduce costs by up to 90% with Prompt Caching Model selection strategy — When to use Haiku vs. Sonnet vs. Opus Practical…

iptables couldn’t handle the scale to change the world. eBPF changed the kernel itself. > 🎯 What this article covers The history of Kubernetes CNI: The generational shift from Flannel → Calico → Cilium The fundamental limitations of iptables and how eBPF overcame them The real reasons Google, AWS, Azure, and Alibaba chose Cilium How…

If clients receive errors every time you scale-in, it’s not a design problem, but a termination strategy problem. > > The narrative of Graceful Shutdown, completing all tasks just before termination and safely concluding — the heart of a sailor tidying up and departing orderly amidst chaos. 🎯 What this article covers What happens to…

“It’s great that AI writes code… But if you just tell it to, it’ll dump everything into a single main.tf, and make all IAM policies ‘*’.” — A common experience for all DevOps engineers > 🎯 What this article covers Why Agent Skills are necessary when using Terraform with Claude Code 5 Skill/Agents that are…

“I want to build an agent, but what should I use?” This article will solve that dilemma. > 🎯 What This Article Covers 10 open-source agents/frameworks that can utilize the Claude API as a backend Summary of each tool’s key features, architecture, and pros & cons Optimal recommendation guide by use case Includes actual installation…

As of 2026, for AI to properly understand HCL, an “official textbook” is needed. HashiCorp’s self-developed Agent Skills is precisely that. > 🎯 What This Article Covers Why HashiCorp Agent Skills were created and how they differ from MCP Two ways to install them in Claude Code and Antigravity List of included Skills and their…

A server created with a single console click, no one knows who made it. If you don’t leave it as code, that infrastructure will soon become a ghost. > > Expressing the consistency and control of IaC, which repeatedly deploys the same infrastructure with a single piece of code, as ‘a city built simultaneously from…

The era of SSHing into each node to modify configs is over. Control the entire cluster with a single ConfigMap. > > The narrative of uniformly controlling the certificate renewal cycle for all worker nodes in a cluster with a single ConfigMap — the precision of a watchmaker synchronizing dozens of clocks (nodes) simultaneously. 🎯…

“Our team can just write it, can’t we?” — This one sentence can cost an organization three months. > 🎯 What this article covers The real reasons behind the Terraform code ownership debate Advantages and limitations when the infrastructure team is responsible Advantages and limitations when the development team (including DevOps) is responsible 3 practical…