Kubernetes
31 guides tagged “Kubernetes”.
- ImagePullBackOff: What It Means and How to Fix It ImagePullBackOff means Kubernetes cannot download your container image. Learn the causes — bad tag, auth, rate limit, network — and how to diagnose each.
- Why Is My Kubernetes Pod Stuck Pending? A Pending pod has not been scheduled onto a node. Learn the causes — resources, taints, selectors, volumes — and how to diagnose each with describe.
- Kubernetes Security for AI Builders: Hardening the Cluster Your Assistant Configured A default cluster trusts everything inside it. Learn RBAC, network policies, pod security, Secrets, and image hardening — the Kubernetes security work your AI's manifests skip.
- k3s for Vibecoders: Kubernetes on One Cheap Server, Without the Cloud Bill k3s is real Kubernetes in a single binary that runs on a $6 VPS. Learn what it bundles, how to deploy your AI-built app to it, and when a managed cluster is still the better call.
- Kubernetes for AI Builders: Run What Your Assistant Generates Without Wrecking Production Your AI writes Kubernetes manifests it doesn't understand. Learn the objects, the failure modes, the cost traps, and the security gaps — with every linked guide.
- DevOps for AI Builders: What You Need to Know When Your AI Writes the Infra Your AI coding assistant writes CI/CD pipelines, Dockerfiles, and Terraform. Here's every DevOps concept you need to understand so it doesn't burn production down. 60+ linked guides.
- How to Run PostgreSQL on k3s (With Backups That Actually Restore) Run Postgres on a single-node k3s cluster with a StatefulSet, a PersistentVolumeClaim, and a scheduled off-node backup you have restored at least once.
- What Is Kubernetes RBAC (and What Did Your AI Grant Away)? RBAC decides which identities can perform which actions on which resources. Generated manifests routinely over-permission service accounts, and the fix is scoping.
- Kubernetes vs k3s: Which Should You Run for an AI-Built App? Kubernetes and k3s run the same manifests. The difference is packaging, operations, and cost. A decision guide for small apps and solo builders.
- What Is k3s (and When Should You Use It)? k3s is certified Kubernetes in a single binary: same API, bundled ingress and storage, and small enough to run on one cheap server. What it is and when to use it.
- What Is a Service Mesh? A service mesh handles service-to-service traffic — mTLS, retries, observability — via sidecar proxies. Learn what it does and when it's overkill.
- How to Upgrade a Kubernetes Cluster Without Downtime Upgrade a control plane and its nodes in the right order, one minor version at a time, with PodDisruptionBudgets and a tested rollback. Covers managed clusters and k3s.
- How to Set Up GitOps on a Single-Node k3s Cluster Point Argo CD at a Git repository and let it drive a single-node k3s cluster: automatic sync, drift correction, and rollbacks that are git reverts instead of kubectl commands.
- How to Set Up Horizontal Pod Autoscaling (HPA) in Kubernetes Install the metrics server, set resource requests, create an HPA, and load test it until it actually scales — plus the tuning that stops it flapping and the checks that catch a silent failure.
- The Kubernetes Security Checklist for AI-Built Clusters A default cluster trusts everything inside it. Work through the identity, network, workload, secrets, and image checks your AI's manifests left at their permissive defaults.
- Why Is My Kubernetes Bill So High (and How Do I Cut It)? Most Kubernetes cost comes from control planes, idle nodes, and per-service load balancers rather than compute. Learn the line items and how to cut them.
- What Is a Kubernetes Ingress (and Why Is My App Unreachable)? An Ingress routes external HTTP traffic to Services by hostname and path, and usually terminates TLS. What it is, how a request reaches your app, and why it 404s.
- Kubernetes Pod Security: Why Your AI's Container Runs as Root Generated manifests leave containers running as root with default capabilities and a writable filesystem. Pod security settings close that gap, starting with securityContext.
- How to Deploy an App to a Cheap VPS With k3s Install k3s on a single VPS, deploy a containerized app with a Deployment and Service, expose it with an Ingress, and add automatic HTTPS with cert-manager.
- How to Deploy Your First App to Kubernetes A step-by-step tutorial to deploy a containerized app to Kubernetes with a Deployment and Service, using minikube and kubectl.
- Kubernetes Requests vs Limits: Why Your Pod Gets OOMKilled Resource requests tell the scheduler what to reserve; limits tell the runtime when to throttle or kill. Setting them wrong causes OOMKills, throttling, and eviction.
- Kubernetes Deployment vs StatefulSet: Which Does Your Service Need? Deployments treat pods as interchangeable; StatefulSets give each pod a stable identity and its own storage. Choosing wrong for a database loses data.
- Liveness vs Readiness vs Startup Probes in Kubernetes Probes tell Kubernetes whether a container is alive, ready for traffic, or still starting. Get them wrong and you get 502s, restart loops, or both.
- What Is Helm (and Should You Use It for Your App)? Helm packages Kubernetes manifests into reusable charts with configurable values. What charts, values, and releases are, and when the added layer is worth it.
- Kubernetes YAML Explained: Deployments, Services, and What Your AI Writes Kubernetes manifests are four fields deep and highly repetitive. Learn the parts of a Deployment and Service that matter, and how to read the YAML your AI generates.
- Kubernetes Autoscaling Explained: HPA vs VPA vs Cluster Autoscaler Kubernetes has three autoscalers that answer three different questions. Learn which one scales replicas, which resizes pods, which adds nodes, and when autoscaling is the wrong fix.
- How to Set Up GitOps With Argo CD A step-by-step tutorial to install Argo CD, connect it to a Git repo, and deploy an app declaratively — so Git becomes your source of truth.
- Kubernetes vs Docker Compose: When Should You Graduate? Docker Compose runs containers on one machine; Kubernetes runs them across many. A practical comparison of when each is enough, and the concrete signs you have outgrown Compose.
- Are Kubernetes Secrets Actually Secret? A Kubernetes Secret is base64-encoded, not encrypted, and readable by anyone with get on Secrets. Learn what it does and does not protect, and how to harden it.
- What Is Kubernetes and Why Does My App Need It? Kubernetes schedules and runs containerized apps across many machines, handling scaling and self-healing. Learn what it does and when you don't need it.
- What Is a Kubernetes Network Policy? By default every pod can reach every other pod. A network policy restricts that traffic to explicit flows, containing a compromise instead of letting it spread.