Kubernetes Tutorial

What is Kubernetes? Kubernetes (often written k8s) is an open-source platform that automates deploying, scaling and operating containerized applications. You describe the desired ...

Control Plane and Worker Nodes A Kubernetes cluster has two logical parts. The control plane makes cluster-wide decisions; the worker nodes run your application workloads. Control ...

What is a Pod? A pod is the smallest thing you can schedule in Kubernetes. It wraps one or more containers that share the same IP address, network namespace and optional shared ...

Why Deployments? A Deployment is a controller that manages a set of identical pods via a ReplicaSet. It guarantees the desired number of replicas, supports rolling updates and ...

Why Services? Pods come and go and get new IPs constantly. A Service gives a stable virtual IP and DNS name in front of a set of pods, selected by labels. Service Types ClusterIP ...

Separating Config from Containers Hard-coding configuration in the image is a bad idea. Kubernetes offers ConfigMap for non-sensitive config and Secret for sensitive values like ...

Why Storage Needs Special Handling Container filesystems are ephemeral. When a pod dies, its data dies with it. For databases, uploads and logs you need persistent storage ...

What is Ingress? Ingress is the layer-7 (HTTP/HTTPS) way to expose services to the outside world. Instead of giving every service a public IP (LoadBalancer), one Ingress ...

Organising the Cluster A namespace partitions a cluster into logical groups. Teams, environments (dev, staging, prod) and application stacks each get their own namespace so ...

What is Helm? Helm is the package manager for Kubernetes. A chart bundles manifests, defaults and templates; you install it with values instead of hand-editing YAML files. ...

Requests and Limits Every container should declare how much CPU and memory it needs ( requests ) and its hard ceiling ( limits ). The scheduler uses requests; limits protect ...

The Metrics Pipeline Prometheus scrapes metrics from the cluster and applications; Grafana visualises them; Loki collects logs; Alertmanager fires alerts. Getting Cluster Metrics ...

Before You Go Live Set resource requests and limits on every container. Add liveness and readiness probes so Kubernetes restarts or reroutes broken pods. Encrypt Secrets at rest ...