Tag: #operator

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• Spinning Up and Killing Postgres on Kubernetes with CloudNativePG — Failover Measured at 23 Seconds

  On a real 8-node Kubernetes cluster, I installed CloudNativePG (CNPG) v1.30.0, brought up a 3-instance Postgres cluster, and then actually killed the primary. From bootstrap through replication checks, to failover after

  2026-07-11 · 5 min read #cloudnativepg#postgresql#kubernetes#operator#database

• Building a Kubernetes GPU Operator in Rust — Diagnosing a Real Cluster with kube-rs

  Against a production 8-node homelab cluster (k8s v1.32.5), I used kube-rs to build and run a GPU operator in Rust myself. I defined a GpuInventory custom resource and launched two controllers (node scan → record CR statu

  2026-07-11 · 6 min read #rust#kubernetes#operator#gpu#kube-rs

• Building a Kubernetes Operator in Rust (kube-rs)

  A Kubernetes Operator is a controller that encodes operational knowledge as code. This post covers the Operator pattern (CRD + controller + reconcile loop) from first principles, then how to build a real operator with ku

  2026-06-25 · 12 min read #rust#kubernetes#operator#kube-rs

• Operator vs Helm vs GitOps — Which to Use When

  These three operational tools look similar but solve different problems. Helm is packaging, GitOps is declarative synchronization, and an Operator is an active controller. We dig into static deployment versus continuous

  2026-06-15 · 19 min read #kubernetes#operator#helm#gitops#argocd

• Operator Security — Least-Privilege RBAC, Multi-Tenancy, Supply Chain

  An Operator runs cluster-wide with powerful privileges, so a single compromise can endanger the whole cluster. This article covers Operator security end to end — generating least-privilege RBAC with markers, choosing Rol

  2026-06-15 · 21 min read #kubernetes#operator#rbac#security#supply-chain

• Operator Observability — Metrics, Events, Logging, and SLOs

  A deep dive into observability for Kubebuilder-based Operators across metrics, events, logging, tracing, status/conditions, and SLOs. From the meaning of controller-runtime default metrics to adding custom metrics, wirin

  2026-06-15 · 19 min read #kubernetes#operator#observability#prometheus#controller-runtime

• CRD Design and Versioning — Schema, Validation, and Conversion Webhooks

  A CustomResourceDefinition is an API contract that outlives the code around it. This deep dive walks through OpenAPI v3 schema design and CEL validation, multi-version strategy and storage versions, conversion webhook im

  2026-06-15 · 16 min read #kubernetes#operator#crd#versioning#conversion-webhook

• Operator Testing and Distribution — envtest, e2e, OLM, and Bundle Packaging

  A deep dive into testing and distributing Kubernetes Operators safely. Covers the test pyramid (unit reconcile, envtest, e2e), OLM concepts (CSV, bundle, catalog), upgrade graphs, least-privilege RBAC, multi-tenant insta

  2026-06-15 · 15 min read #kubernetes#operator#testing#envtest#olm

• What You Can Build with Operators — A Real-World Catalog

  A catalog of where Operators shine — databases, messaging, caching, monitoring, certificates, secrets, GitOps, backup, service mesh, and ML. For each case we cover how it works, a representative CRD example, a comparison

  2026-06-15 · 12 min read #kubernetes#operator#crd#cncf#platform-engineering

• Advanced Operators — Finalizers, Admission Webhooks, and Status/Conditions Design

  This post covers the three topics that move a Kubernetes Operator from a demo to production: cleaning up external resources with Finalizers, Validating and Mutating Admission Webhooks, and designing the Status subresourc

  2026-06-15 · 14 min read #kubernetes#operator#finalizer#webhook#kubebuilder

• Understanding the Kubernetes Operator Pattern — Controllers, Reconciliation, and Codifying Operational Knowledge

  A deep, operations-focused look at what the Operator pattern solves, how the control loop and reconciliation work, how CRDs and controllers combine, control plane extension mechanisms, Capability Levels, and when to use

  2026-06-15 · 20 min read #kubernetes#operator#controller#reconcile#crd

• Building a Database Operator — Backup, Failover, and Scale as Code

  A code-driven walkthrough of solving the hard parts of stateful database operations with a reconcile loop. We cover CR spec design, reconciling StatefulSet/Service/PVC, periodic backups, failover and leader-election conc

  2026-06-15 · 14 min read #kubernetes#operator#database#kubebuilder#controller-runtime

• Production Operator Upgrades and Migration — Evolving Without Downtime

  A complete walkthrough of safely upgrading an Operator in production. It covers rolling the controller Deployment with leader election, multi-version CRDs and conversion webhooks, phased rollout of managed workloads, rol

  2026-06-15 · 22 min read #kubernetes#operator#kubebuilder#controller-runtime#crd

• The Reconcile Loop in Depth — Idempotency, Error Handling, Queues, and Performance

  A deep dissection of the reconcile loop: the request flow (informer to workqueue to reconcile), Result and requeue, idempotency patterns, status and conditions, predicate event filters, rate limiting and concurrency, cac

  2026-06-15 · 18 min read #kubernetes#operator#reconcile#controller-runtime#performance

• Not Just Go — Building Operators With Kopf, Metacontroller, and Shell Operator

  We break the myth that an Operator must be built with Go and kubebuilder. We compare non-Go options with code: Python Kopf, the declarative-hook approach of Metacontroller, and shell-operator and Ansible Operator. We cov

  2026-06-15 · 19 min read #kubernetes#operator#kopf#metacontroller#python

• Operator Best Practices and Anti-Patterns

  A code-level rundown of what makes a good Operator and the common anti-patterns. From principles like a small API, idempotent reconcile, observability, and safe upgrades, through pitfalls like side-effect spam, status mi

  2026-06-15 · 14 min read #kubernetes#operator#best-practices#reconcile#rbac

• Building Your First Operator with Kubebuilder — From Project Creation to Deployment

  Build a working Operator end to end with Kubebuilder. Covers prerequisites, the init/create api flow, defining API types, the full reconcile code that manages a Deployment and Service, RBAC markers, CRD generation, local

  2026-06-15 · 10 min read #kubernetes#kubebuilder#operator#controller-runtime#go

• Kubernetes Database Deep Dive 2025: Operator Patterns, HA Configuration, Backup/Recovery, Performance Tuning

  K8s DB operations deep dive! CloudNativePG vs Percona Operator comparison, Primary-Replica automatic Failover, pgBackRest/Velero backup, WAL archiving, Connection Pooling (PgBouncer), resource tuning (CPU/Memory/IOPS), A

  2026-04-13 · 20 min read #kubernetes#database#operator#cloudnativepg#percona

• Running Databases on K8s -- Complete Guide to CNPG, Percona, Vitess, and Helm Charts

  A comprehensive overview of running databases in Kubernetes environments. We compare CloudNativePG, Percona Operator, Vitess, and major Helm charts, and share practical operational know-how.

  2026-04-11 · 15 min read #database#kubernetes#cnpg#postgresql#mysql

• Running Databases on Kubernetes Complete Guide: StatefulSet, Operators, Backup and Recovery

  Everything about running DBs on K8s! StatefulSet vs Deployment, PV/PVC/StorageClass, DB Operators (CloudNativePG/Percona/MongoDB), Backup/Recovery (Velero/pgBackRest), Monitoring (PMM), HA/Failover, Performance Tuning, P

  2026-03-24 · 17 min read #kubernetes#database#statefulset#operator#postgresql