Notes on Kubernetes, DevOps, automation, and occasional personal posts.https://marcwilnauer.de/en-gbhttps://marcwilnauer.de/blog/openshift-day-two-operations/https://marcwilnauer.de/blog/openshift-day-two-operations/Upgrades, monitoring, logging, quotas, backup mindset, and when to escalate to the platform team — the work that starts after the first deploy succeeds.Wed, 11 Nov 2026 00:00:00 GMTKubernetesDevOpsOpenShifthttps://marcwilnauer.de/blog/openshift-gitops-practical-guide/https://marcwilnauer.de/blog/openshift-gitops-practical-guide/Argo CD on OCP, the OpenShift GitOps operator, app-of-apps cautions, sync versus platform guardrails, and drift on managed clusters — without pretending Git is the whole story.Wed, 04 Nov 2026 00:00:00 GMTKubernetesDevOpsOpenShifthttps://marcwilnauer.de/blog/openshift-imagestreams-builds-intro/https://marcwilnauer.de/blog/openshift-imagestreams-builds-intro/What ImageStreams are for, how BuildConfigs produce tags, S2I vs Dockerfile builds, and when to skip in-cluster builds and pull from an external registry instead.Wed, 28 Oct 2026 00:00:00 GMTKubernetesDevOpsOpenShifthttps://marcwilnauer.de/blog/oc-cli-essentials-openshift/https://marcwilnauer.de/blog/oc-cli-essentials-openshift/The oc commands worth learning first on OpenShift: login and projects, how oc relates to kubectl, common platform verbs, and a calm debugging order.Wed, 21 Oct 2026 00:00:00 GMTKubernetesDevOpsOpenShifthttps://marcwilnauer.de/blog/openshift-projects-rbac-basics/https://marcwilnauer.de/blog/openshift-projects-rbac-basics/How Projects relate to Namespaces, what view/edit/admin mean, ServiceAccounts, oc adm policy, and how to test permissions before they become incident surprises.Wed, 14 Oct 2026 00:00:00 GMTKubernetesDevOpsOpenShifthttps://marcwilnauer.de/blog/openshift-security-context-constraints/https://marcwilnauer.de/blog/openshift-security-context-constraints/Why OpenShift uses SCCs, how restricted and anyuid differ, common Pod failures, and a practical path to debug denials without reaching for cluster-admin.Wed, 07 Oct 2026 00:00:00 GMTKubernetesDevOpsOpenShifthttps://marcwilnauer.de/blog/openshift-routes-explained/https://marcwilnauer.de/blog/openshift-routes-explained/A practical guide to OpenShift Routes for people who know Services and Ingress: how Routes differ, edge TLS, hostnames, oc get route, and debugging traffic from the edge to the Pod.Wed, 30 Sep 2026 00:00:00 GMTKubernetesDevOpsOpenShifthttps://marcwilnauer.de/blog/openshift-vs-kubernetes-whats-different/https://marcwilnauer.de/blog/openshift-vs-kubernetes-whats-different/A practical comparison for Kubernetes users meeting OpenShift: same core API, vendor packaging, Routes, SCCs, Projects, Operators, where skills transfer, and honest limits.Wed, 23 Sep 2026 00:00:00 GMTKubernetesDevOpsOpenShifthttps://marcwilnauer.de/blog/k9s-kubernetes-terminal-ui/https://marcwilnauer.de/blog/k9s-kubernetes-terminal-ui/k9s is a terminal-based UI for Kubernetes that makes navigating, debugging, and managing cluster resources faster than any kubectl command you can type.Sat, 30 May 2026 00:00:00 GMTKubernetesDevOpsToolshttps://marcwilnauer.de/blog/kubectl-neat-clean-yaml-output/https://marcwilnauer.de/blog/kubectl-neat-clean-yaml-output/kubectl neat removes the noise from Kubernetes YAML output — no more wading through auto-generated fields, timestamps, and status blocks to find what you actually need.Sat, 30 May 2026 00:00:00 GMTKubernetesDevOpsToolshttps://marcwilnauer.de/blog/kubectl-node-shell-debug-nodes/https://marcwilnauer.de/blog/kubectl-node-shell-debug-nodes/kubectl node-shell gives you direct shell access to any Kubernetes node without SSH — essential for low-level debugging that pod-level access cannot reach.Sat, 30 May 2026 00:00:00 GMTKubernetesDevOpsToolshttps://marcwilnauer.de/blog/kubectl-tree-visualize-object-hierarchies/https://marcwilnauer.de/blog/kubectl-tree-visualize-object-hierarchies/Use the kubectl tree plugin to follow ownerReferences and see which Deployment owns which ReplicaSet and Pod — without spelunking YAML.Sat, 30 May 2026 00:00:00 GMTKubernetesDevOpsToolshttps://marcwilnauer.de/blog/kubectx-kubens-switch-contexts-namespaces/https://marcwilnauer.de/blog/kubectx-kubens-switch-contexts-namespaces/Stop typing long kubectl config commands. kubectx and kubens let you switch between clusters and namespaces instantly — a must-have for multiple environments.Sat, 30 May 2026 00:00:00 GMTKubernetesDevOpsToolshttps://marcwilnauer.de/blog/kubekosh-learn-kubernetes-hands-on/https://marcwilnauer.de/blog/kubekosh-learn-kubernetes-hands-on/KubeKosh runs a real Kubernetes cluster inside a single Docker container with a browser terminal and scenario validation. Build kubectl muscle memory locally, for free.Sat, 30 May 2026 00:00:00 GMTKubernetesDevOpsToolshttps://marcwilnauer.de/blog/stern-tail-logs-multiple-pods/https://marcwilnauer.de/blog/stern-tail-logs-multiple-pods/stern lets you stream logs from multiple pods and containers simultaneously, with color-coded output and powerful filtering — the tool kubectl logs should have been.Sat, 30 May 2026 00:00:00 GMTKubernetesDevOpsToolshttps://marcwilnauer.de/blog/life-of-a-kubernetes-pod/https://marcwilnauer.de/blog/life-of-a-kubernetes-pod/A stable app enters the cluster — told from the Pod's perspective: who creates me, who talks to me, who keeps me alive, and how my life ends.Fri, 29 May 2026 00:00:00 GMTKubernetesDevOpshttps://marcwilnauer.de/blog/kubernetes-helm-basics-beginners/https://marcwilnauer.de/blog/kubernetes-helm-basics-beginners/A practical introduction to Helm charts, releases, and values — when Helm helps, how install upgrade and rollback work, and when plain YAML is enough.Thu, 28 May 2026 00:00:00 GMTKubernetesDevOpshttps://marcwilnauer.de/blog/kubernetes-liveness-readiness-probes-beginners/https://marcwilnauer.de/blog/kubernetes-liveness-readiness-probes-beginners/A practical guide to startup, readiness, and liveness probes: what each one does, how to configure HTTP, TCP, and exec checks, and how they connect to Services.Wed, 27 May 2026 00:00:00 GMTKubernetesDevOpshttps://marcwilnauer.de/blog/kubectl-essentials-for-beginners/https://marcwilnauer.de/blog/kubectl-essentials-for-beginners/The kubectl commands and flags worth learning first: get, describe, logs, contexts, apply, explain, dry-run, and a calm debugging order.Tue, 26 May 2026 00:00:00 GMTKubernetesDevOpshttps://marcwilnauer.de/blog/from-docker-compose-to-kubernetes/https://marcwilnauer.de/blog/from-docker-compose-to-kubernetes/A practical map from docker-compose.yml to Deployments, Services, volumes, and env vars — plus what gets harder and how to migrate incrementally.Mon, 25 May 2026 00:00:00 GMTKubernetesDevOpshttps://marcwilnauer.de/blog/statefulsets-for-beginners/https://marcwilnauer.de/blog/statefulsets-for-beginners/A practical beginner guide to StatefulSets: stable pod identity, ordered rollouts, headless Services, volumeClaimTemplates, and when Deployments are not enough.Sun, 24 May 2026 00:00:00 GMTKubernetesDevOpshttps://marcwilnauer.de/blog/kubernetes-jobs-cronjobs-beginners/https://marcwilnauer.de/blog/kubernetes-jobs-cronjobs-beginners/A practical beginner guide to Kubernetes Jobs and CronJobs: when to use them instead of Deployments, how schedules and backoff work, and how to debug failed runs.Sat, 23 May 2026 00:00:00 GMTKubernetesDevOpshttps://marcwilnauer.de/blog/kubernetes-ingress-for-beginners/https://marcwilnauer.de/blog/kubernetes-ingress-for-beginners/A practical guide to Ingress rules, how they differ from Services, why you need an Ingress controller, TLS basics, and how to debug empty backends.Fri, 22 May 2026 00:00:00 GMTKubernetesDevOpshttps://marcwilnauer.de/blog/first-kubernetes-cluster-kind-minikube/https://marcwilnauer.de/blog/first-kubernetes-cluster-kind-minikube/A practical guide to running a local Kubernetes cluster with kind or minikube, connecting kubectl, deploying your first workload, and cleaning up without surprises.Thu, 21 May 2026 00:00:00 GMTKubernetesDevOpshttps://marcwilnauer.de/blog/namespaces-rbac-security-basics/https://marcwilnauer.de/blog/namespaces-rbac-security-basics/A beginner-friendly guide to Kubernetes boundaries, permissions, and the security habits that prevent small mistakes from becoming cluster-wide problems.Wed, 20 May 2026 00:00:00 GMTKubernetesDevOpshttps://marcwilnauer.de/blog/debugging-kubernetes-workloads-beginners/https://marcwilnauer.de/blog/debugging-kubernetes-workloads-beginners/A practical first debugging path for Pods, Deployments, Services, and the small signals Kubernetes gives before things fail loudly.Tue, 19 May 2026 00:00:00 GMTKubernetesDevOpshttps://marcwilnauer.de/blog/resource-requests-limits-scheduling-basics/https://marcwilnauer.de/blog/resource-requests-limits-scheduling-basics/A beginner-friendly guide to how Kubernetes uses CPU and memory requests, limits, QoS classes, and scheduling events when placing Pods.Mon, 18 May 2026 00:00:00 GMTKubernetesDevOpshttps://marcwilnauer.de/blog/kubernetes-storage-persistent-volumes/https://marcwilnauer.de/blog/kubernetes-storage-persistent-volumes/A practical beginner guide to Kubernetes storage, PersistentVolumes, PersistentVolumeClaims, StorageClasses, and the checks that make storage problems less mysterious.Sun, 17 May 2026 00:00:00 GMTKubernetesDevOpshttps://marcwilnauer.de/blog/configmaps-secrets-environment-configuration/https://marcwilnauer.de/blog/configmaps-secrets-environment-configuration/A beginner-friendly guide to putting configuration in the right place, using ConfigMaps and Secrets safely, and checking what Pods actually receive.Sat, 16 May 2026 00:00:00 GMTKubernetesDevOpshttps://marcwilnauer.de/blog/kubernetes-services-networking-dns/https://marcwilnauer.de/blog/kubernetes-services-networking-dns/A practical beginner guide to how Pods get stable addresses, how Services route traffic, and what Kubernetes DNS really resolves.Fri, 15 May 2026 00:00:00 GMTKubernetesDevOpshttps://marcwilnauer.de/blog/pods-deployments-replicasets-explained/https://marcwilnauer.de/blog/pods-deployments-replicasets-explained/A practical beginner explanation of how Pods, ReplicaSets, and Deployments relate, why each exists, and how to inspect them with kubectl.Thu, 14 May 2026 00:00:00 GMTKubernetesDevOpshttps://marcwilnauer.de/blog/kubernetes-supermarket-chain-analogy/https://marcwilnauer.de/blog/kubernetes-supermarket-chain-analogy/A beginner-friendly explanation of the Kubernetes Control Plane, Kubelets, Pods, Services, and more through the lens of a nationwide supermarket chain.Wed, 13 May 2026 00:00:00 GMTKubernetesDevOpsOpenShifthttps://marcwilnauer.de/blog/kubernetes-mental-models-for-beginners/https://marcwilnauer.de/blog/kubernetes-mental-models-for-beginners/A beginner-friendly way to think about Kubernetes before memorising commands: desired state, controllers, scheduling, services, and debugging.Tue, 12 May 2026 00:00:00 GMTKubernetesDevOpshttps://marcwilnauer.de/blog/on-call-fatigue-and-rest/https://marcwilnauer.de/blog/on-call-fatigue-and-rest/Pagers do not care about duty time limits — what aviation rest rules taught me about sustainable on-call rotations and tired humans making tired mistakes.Tue, 12 May 2026 00:00:00 GMTDevOpsPersonalKuberneteshttps://marcwilnauer.de/blog/kubernetes-incident-checklist/https://marcwilnauer.de/blog/kubernetes-incident-checklist/What I try to do first when a cluster or workload looks wrong — before random kubectl and hoping.Sun, 15 Mar 2026 00:00:00 GMTKubernetesOpenShiftDevOpshttps://marcwilnauer.de/blog/network-policies-one-rule-at-a-time/https://marcwilnauer.de/blog/network-policies-one-rule-at-a-time/Zero trust in Kubernetes sounds right until you lock yourself out of DNS — how I roll out NetworkPolicy without turning Friday into a outage.Sun, 08 Mar 2026 00:00:00 GMTKubernetesDevOpsOpenShifthttps://marcwilnauer.de/blog/resource-requests-limits-honest-capacity/https://marcwilnauer.de/blog/resource-requests-limits-honest-capacity/Kubernetes schedules on promises and kills on limits — why copying YAML from a tutorial is not a sizing strategy, and what I do instead.Thu, 22 Jan 2026 00:00:00 GMTKubernetesDevOpsPersonalhttps://marcwilnauer.de/blog/aviation-devops-reliability/https://marcwilnauer.de/blog/aviation-devops-reliability/A personal note on habits from the cockpit that still show up when a cluster misbehaves.Thu, 08 Jan 2026 00:00:00 GMTPersonalDevOpshttps://marcwilnauer.de/blog/rolling-vs-blue-green-vs-canary/https://marcwilnauer.de/blog/rolling-vs-blue-green-vs-canary/Rolling, Blue-Green and Canary are different ways to handle risk — not just synonyms for zero-downtime deploy.Wed, 12 Nov 2025 00:00:00 GMTKubernetesDevOpshttps://marcwilnauer.de/blog/degraded-mode-minimum-equipment/https://marcwilnauer.de/blog/degraded-mode-minimum-equipment/You don't need every system green to operate safely — you need to know what's deferred, what's compensating, and when to stop.Mon, 03 Nov 2025 00:00:00 GMTKubernetesDevOpsPersonalhttps://marcwilnauer.de/blog/gitops-trust-but-verify/https://marcwilnauer.de/blog/gitops-trust-but-verify/Argo CD, drift, and the honest cases where Git as source of truth helps — or makes things worse.Mon, 22 Sep 2025 00:00:00 GMTGitOpsKubernetesDevOpsArgo CDhttps://marcwilnauer.de/blog/alert-fatigue-radio-discipline/https://marcwilnauer.de/blog/alert-fatigue-radio-discipline/When every ping is an emergency, none of them are — what aviation radio habits taught me about paging on-call engineers.Thu, 07 Aug 2025 00:00:00 GMTDevOpsPersonalKuberneteshttps://marcwilnauer.de/blog/staging-environments-flight-simulator/https://marcwilnauer.de/blog/staging-environments-flight-simulator/Why a staging cluster earns its keep when you treat it like recurrent training — not a cheaper copy of production you never fly.Mon, 12 May 2025 00:00:00 GMTDevOpsKubernetesPersonalhttps://marcwilnauer.de/blog/aborting-a-deploy-go-around/https://marcwilnauer.de/blog/aborting-a-deploy-go-around/Rolling back or stopping a release mid-flight is a trained maneuver — not an admission that the team is bad at their jobs.Wed, 12 Mar 2025 00:00:00 GMTKubernetesDevOpsPersonalhttps://marcwilnauer.de/blog/cross-checking-config-before-apply/https://marcwilnauer.de/blog/cross-checking-config-before-apply/Two-person review and a preflight checklist mindset for kubectl, Helm, and GitOps — borrowed from aviation, adapted for YAML.Wed, 12 Mar 2025 00:00:00 GMTKubernetesDevOpsGitOpsPersonalhttps://marcwilnauer.de/blog/capacity-planning-fuel-reserves/https://marcwilnauer.de/blog/capacity-planning-fuel-reserves/Running a cluster at 100% utilisation is like planning a flight with zero alternate fuel — workable on paper until the weather shifts.Mon, 18 Nov 2024 00:00:00 GMTKubernetesDevOpsPersonalhttps://marcwilnauer.de/blog/learning-kubernetes-after-aviation/https://marcwilnauer.de/blog/learning-kubernetes-after-aviation/Notes from a Lufthansa pilot who started over in DevOps — no shortcut story, just what actually helped.Fri, 08 Nov 2024 00:00:00 GMTPersonalKubernetesDevOpshttps://marcwilnauer.de/blog/readiness-probes-preflight-checks/https://marcwilnauer.de/blog/readiness-probes-preflight-checks/Kubernetes will send traffic to a Pod that looks "running" but isn't ready to work.Thu, 03 Oct 2024 00:00:00 GMTKubernetesDevOpshttps://marcwilnauer.de/blog/crew-resource-management-incident-bridges/https://marcwilnauer.de/blog/crew-resource-management-incident-bridges/Who speaks, who listens, who decides — lessons from the cockpit for noisy war rooms.Thu, 22 Aug 2024 00:00:00 GMTDevOpsPersonalhttps://marcwilnauer.de/blog/sterile-cockpit-production-changes/https://marcwilnauer.de/blog/sterile-cockpit-production-changes/Below ten thousand feet, pilots limit conversation to essentials — production deserves the same focus when the blast radius is real.Sat, 15 Jun 2024 00:00:00 GMTDevOpsKubernetesPersonalhttps://marcwilnauer.de/blog/runbooks-like-flight-manuals/https://marcwilnauer.de/blog/runbooks-like-flight-manuals/Procedures don't replace thinking — but they buy you time when the adrenaline kicks in.Fri, 14 Jun 2024 00:00:00 GMTDevOpsPersonalKubernetes