DevOps&SRE Library

Most people interact with Kubernetes through the cloud. They probably are as close to the cluster as they are to their laptop. Using a cluster in the cloud with a web browser or terminal is fine but there is something more intimate or rewarding to deploying a kubernetes cluster on bare metal. And even more rewarding is physically unplugging a node and watch Kubernetes rebalancing the workloads.

In this article, we'll walk through how to build a fully automated CI/CD workflow using Argo CD, Argo CD Image Updater, GitHub, Amazon Elastic Container Registry, Amazon Elastic Kubernetes Service. This setup enables automatic deployment whenever a new container image is pushed to the registry with no manual intervention.

This article explores how Cilium Cluster Mesh simplifies multi-cluster Kubernetes connectivity, covering both the underlying challenges of so-called Mesh solution and how Cilium addresses them. It also provides a hands-on scenario that interconnects a multi-cloud application running on the native Kubernetes services of Amazon Web Services and Google Cloud Platform.

How we took a 5-service Java application from docker-compose up to a production-grade Kubernetes cluster — and every bug we hit along the way.

Stop paying for idle resources. Learn to identify and eliminate the hidden blockers preventing your cluster from scaling down.

Standard migration paths require downtime. At our scale, taking hundreds of disks (backing data stores like ClickHouse, CockroachDB, Kafka, Prometheus) offline was off limits. This blog introduces an in-place PVC re-binding technique that swaps a PersistentVolumeClaim's backing PersistentVolume while keeping the underlying disk intact. It requires only a single pod restart per volume, done entirely using the Kubernetes API natively with no custom software or control plane hacks.

With the retirement of ingress-nginx I've seen a lot of frustrations with Gateway API migrations due to differences in some of the resource models. The common problem is that Ingress users are often running self-service models, where application teams fully own their ingress configuration, including TLS certificates.

At VictoriaMetrics, we built vlagent as a high-performance log collector for VictoriaLogs. To validate its performance and correctness under a real production-like load, we developed a benchmark suite and ran it against 8 popular log collectors. This post covers the methodology, throughput results, resource usage, and delivery correctness.

A fault-tolerant, API-agnostic RPC load balancer for blockchain APIs.

A practical, production-ready cheat sheet to understand certificates, fix TLS handshake errors and debug real-world issues using OpenSSL, curl and Kubernetes.

This cluster runs on a Raspberry Pi 3, inside a normal household network, behind an ISP router that cannot be replaced. The goal was not to build a "homelab". The goal was to design a small, portable, security-focused platform using the same principles I would apply in a professional environment.

We have all been there. You are pushing a hotfix at midnight, you forget to remove a test API key you hardcoded during debugging, and it ends up in the main branch. Secrets leaking into version control is one of the most common and costly security mistakes in software development.

When deploying applications to Kubernetes, one of the first security concerns that arises is secret management. This article chronicles my journey of migrating a Grafana admin password from a hardcoded Helm value to AWS Systems Manager Parameter Store using the External Secrets Operator.

The "should I run databases on Kubernetes?" debate is over. Zalando runs 4,000+ PostgreSQL clusters on Kubernetes. Bloomberg, Apple, and dozens of CNCF end-user companies do the same. The question is no longer whether it works — it is whether your team should do it, and if so, how to do it without losing data or sleep.

Many Kubernetes environments rely on ingress-nginx as the primary entry point for external traffic. With the retirement of Ingress-NGINX in our environment, we needed to migrate to a new ingress solution. Instead of replacing it with another traditional ingress controller, we chose to adopt Istio and explore its service mesh–based traffic management capabilities.

One static binary that takes a freshly created cluster from "API server answers" to "workloads can be deployed" — a declarative, idempotent DAG of helm, apply, wait, and friends. No kubectl, no helm binary, no bash.

ctx treats your entire DevOps environment as a single switchable context. kubectx is great for what it does, but it only solves one piece of the puzzle: Kubernetes contexts. What about AWS/GCP/Azure credentials, SSH tunnels to databases, VPN connections, environment variables, Vault tokens, Git user configs, and browser profiles for SSO?

As announced November 2025, Kubernetes will retire Ingress-NGINX in March 2026. Despite its widespread usage, Ingress-NGINX is full of surprising defaults and side effects that are probably present in your cluster today. This blog highlights these behaviors so that you can migrate away safely and make a conscious decision about which behaviors to keep. This post also compares Ingress-NGINX with Gateway API and shows you how to preserve Ingress-NGINX behavior in Gateway API. The recurring risk pattern in every section is the same: a seemingly correct translation can still cause outages if it does not consider Ingress-NGINX's quirks.

Our ASP.NET Core pods on Kubernetes were OOM-killed every few hours during a pre-launch pilot. The managed heap was clean — 95% of the memory was native, invisible to every .NET diagnostic tool we threw at it.

Sealed Secrets Web is a web interface for Sealed Secrets by Bitnami. The web interface let you encode, decode the keys in the data field of a secret, load existing Sealed Secrets and create Sealed Secrets. Under the hood it uses Sealed Secrets service API to encrypt your secrets. The web interface should be installed to your Kubernetes cluster, so your developers do not need access to your cluster via kubectl.