A progressive journey through Kubernetes, from your first deployment to production operations. https://k8s.bradpenney.io/ Brad Penney en Tue, 01 Sep 2026 01:08:08 -0000 Tue, 01 Sep 2026 01:08:08 -0000 1440 MkDocs RSS plugin - v1.19.0 https://k8s.bradpenney.io/images/exploring_kubernetes.png https://k8s.bradpenney.io/ Beyond single Pods: how the CRI actually runs your containers, how the scheduler picks a Node, and how to put a cluster app on the real internet. https://k8s.bradpenney.io/efficiency/overview/ Thu, 30 Jul 2026 10:00:00 -0300 Exploring Kubernetes https://k8s.bradpenney.io/efficiency/overview/ What CrashLoopBackOff, Pending, ImagePullBackOff, and OOMKilled actually mean in kubectl get pods. And the commands that take you from symptom to cause to fix. https://k8s.bradpenney.io/essentials/pod_failure_states/ Sun, 26 Jul 2026 10:45:00 -0300 Exploring Kubernetes https://k8s.bradpenney.io/essentials/pod_failure_states/ A Pod isn't running anywhere until something decides which Node it belongs on. Filtering, scoring, taints, and affinity. The mechanics of kube-scheduler, and why Pending is a scheduling failure, not a mystery. https://k8s.bradpenney.io/efficiency/scheduler/ Sun, 26 Jul 2026 10:30:00 -0300 Exploring Kubernetes https://k8s.bradpenney.io/efficiency/scheduler/ How Kubernetes Deployments manage ReplicaSets to scale, self-heal, and roll out zero-downtime updates — the resource you actually create in production. https://k8s.bradpenney.io/essentials/deployments/ Sun, 19 Jul 2026 09:00:00 -0300 Exploring Kubernetes https://k8s.bradpenney.io/essentials/deployments/ Run tasks to completion instead of forever — database migrations, scheduled backups, and batch processing with Kubernetes Jobs and CronJobs. https://k8s.bradpenney.io/essentials/jobs_cronjobs/ Sun, 19 Jul 2026 09:00:00 -0300 Exploring Kubernetes https://k8s.bradpenney.io/essentials/jobs_cronjobs/ Liveness, readiness, and startup probes — what each one actually controls, the HTTP/TCP/exec mechanisms behind them, and the classic mistake that turns a database hiccup into a crash loop. https://k8s.bradpenney.io/essentials/probes/ Sun, 19 Jul 2026 09:00:00 -0300 Exploring Kubernetes https://k8s.bradpenney.io/essentials/probes/ What a ReplicaSet actually does, why Deployments manage them instead of Pods directly, and how to debug one when Pod counts don't match what you expect. https://k8s.bradpenney.io/essentials/replicasets/ Sun, 19 Jul 2026 09:00:00 -0300 Exploring Kubernetes https://k8s.bradpenney.io/essentials/replicasets/ Requests and limits explained the way they actually behave in the kernel — including why CPU limits throttle pods whose average usage graph looks perfectly fine. https://k8s.bradpenney.io/essentials/resource_requests_limits/ Sun, 19 Jul 2026 09:00:00 -0300 Exploring Kubernetes https://k8s.bradpenney.io/essentials/resource_requests_limits/ How kubelet talks to containerd or CRI-O through the CRI: the interface, the dockershim history, and the full path from apply to a running container. https://k8s.bradpenney.io/efficiency/container_runtime/ Tue, 14 Jul 2026 09:00:00 -0300 Exploring Kubernetes https://k8s.bradpenney.io/efficiency/container_runtime/ A working mental model of a Kubernetes cluster — the control plane that decides, the nodes that run your Pods, and the reconcile loop that ties them together. https://k8s.bradpenney.io/essentials/architecture/ Tue, 14 Jul 2026 09:00:00 -0300 Exploring Kubernetes https://k8s.bradpenney.io/essentials/architecture/ Issuers, Certificates, and one Gateway annotation: how cert-manager turns TLS issuance into desired state — plus the debug chain for when it won't issue. https://k8s.bradpenney.io/efficiency/networking/cert_manager/ Thu, 09 Jul 2026 12:00:00 -0300 Exploring Kubernetes https://k8s.bradpenney.io/efficiency/networking/cert_manager/ The last manual step, automated: external-dns watches your HTTPRoutes and writes DNS records — to a cloud provider, or to authoritative DNS you run yourself. https://k8s.bradpenney.io/efficiency/networking/external_dns/ Thu, 09 Jul 2026 12:00:00 -0300 Exploring Kubernetes https://k8s.bradpenney.io/efficiency/networking/external_dns/ Stop writing Ingress annotations. How Gateway API's role-split design works — GatewayClass, Gateway, HTTPRoute — wired end to end with Traefik, TLS included. https://k8s.bradpenney.io/efficiency/networking/gateway_api/ Thu, 09 Jul 2026 12:00:00 -0300 Exploring Kubernetes https://k8s.bradpenney.io/efficiency/networking/gateway_api/ Every existing cluster still routes through Ingress. Read rules, pathTypes, TLS, and annotations fluently — and plan the Gateway API migration off ingress-nginx. https://k8s.bradpenney.io/essentials/ingress/ Thu, 09 Jul 2026 12:00:00 -0300 Exploring Kubernetes https://k8s.bradpenney.io/essentials/ingress/ What actually happens when you set type: LoadBalancer — cloud controllers, MetalLB on bare metal, pending IPs, traffic policy, and the one-per-app trap. https://k8s.bradpenney.io/essentials/loadbalancer_services/ Thu, 09 Jul 2026 12:00:00 -0300 Exploring Kubernetes https://k8s.bradpenney.io/essentials/loadbalancer_services/ Install Helm, the Kubernetes package manager, and connect it to your cluster. Step-by-step guide for macOS, Linux, and Windows with troubleshooting tips. https://k8s.bradpenney.io/day_one/helm/access/ Sun, 15 Feb 2026 14:43:00 -0400 Exploring Kubernetes https://k8s.bradpenney.io/day_one/helm/access/ Master daily Helm commands: list, status, get values, upgrade, rollback. Covers when to use Helm vs kubectl, plus a real-world incident rollback walkthrough. https://k8s.bradpenney.io/day_one/helm/commands/ Sun, 15 Feb 2026 14:43:00 -0400 Exploring Kubernetes https://k8s.bradpenney.io/day_one/helm/commands/ Deploy your first Helm chart to Kubernetes. Covers CI/CD pipeline charts and vendor charts with values.yaml customization, upgrades, rollbacks, and cleanup. https://k8s.bradpenney.io/day_one/helm/first_deploy/ Sun, 15 Feb 2026 14:43:00 -0400 Exploring Kubernetes https://k8s.bradpenney.io/day_one/helm/first_deploy/ See how Helm translates values.yaml into running Kubernetes resources. Understand the rendering pipeline, release tracking, and how to troubleshoot each layer. https://k8s.bradpenney.io/day_one/helm/understanding/ Sun, 15 Feb 2026 14:43:00 -0400 Exploring Kubernetes https://k8s.bradpenney.io/day_one/helm/understanding/ Deep dive into Kubernetes architecture. Learn how Deployments, ReplicaSets, and Pods work together when you deploy applications to K8s clusters. https://k8s.bradpenney.io/day_one/kubectl/understanding/ Sun, 15 Feb 2026 14:43:00 -0400 Exploring Kubernetes https://k8s.bradpenney.io/day_one/kubectl/understanding/