Admission Controllers
Mutating and validating admission controllers, request flow, enabling and disabling plugins.
ReadKubernetes Notes
Study notes on Kubernetes — from cluster architecture and networking to workloads, troubleshooting, and day-to-day operations. 27 notes
Cluster Architecture12
API Deprecations
API versioning scheme, deprecation policy, checking and migrating deprecated APIs.
ReadCertificates
PKI certificates, certificate signing requests, checking expiration, and renewal.
ReadCRDs & Operators
Custom Resource Definitions, creating custom resources, and the Operator pattern.
Readetcd Backup & Restore
Backing up and restoring etcd snapshots, configuration, and health checks.
ReadHelm & Kustomize
Helm charts, repositories, releases, and Kustomize overlays for manifest management.
ReadKubeadm Cluster Installation
Prerequisites, installing kubeadm/kubelet/kubectl, initializing control plane, joining workers.
ReadMonitoring
metrics-server installation, kubectl top for node and pod resource usage.
ReadRBAC
Role-based access control, Roles, ClusterRoles, bindings, and permission checking.
ReadKubeadm Cluster Upgrade
Step-by-step cluster upgrade process for control plane and worker nodes using kubeadm.
ReadHA Control Plane
High-availability control plane topologies, load balancer setup, and multi-master kubeadm configuration.
ReadExtension Interfaces (CNI, CSI, CRI)
Container Runtime Interface, Container Storage Interface, and Container Network Interface — Kubernetes extensibility model.
ReadNetworking7
Networking General
Kubernetes networking model, IP ranges, pod networking, veth pairs, and bridges.
ReadServices
ClusterIP, NodePort, LoadBalancer, ExternalName, headless services, and kube-proxy.
ReadDNS
Service and pod DNS records, DNS policies, CoreDNS configuration and troubleshooting.
ReadIngress
Ingress controllers, IngressClass, path/host-based routing, and TLS termination.
ReadGateway API
GatewayClass, Gateway, HTTPRoute, traffic splitting, and TLS — the evolution of Ingress.
ReadNetwork Policies
Ingress/egress rules, pod/namespace selectors, default deny policies, and CIDR blocks.
ReadCNI
Container Network Interface plugins, checking and installing CNI, pod CIDR configuration.
ReadWorkloads3
Troubleshooting3
Debugging Applications
Pod lifecycle, common issues (Pending, CrashLoopBackOff, ImagePullBackOff), and debugging services.
ReadDebugging Clusters
Cluster health checks, node troubleshooting, control plane logs, and failure modes.
ReadDebugging Networking
DNS debugging, service connectivity flow, kube-proxy, network policy, and CNI troubleshooting.
ReadStorage1
Reference1