Contents - ethernetdude - Kapil Kanth

Kubernetes

Article 16 – Services – LoadBalancer: Moving to the Cloud

The Limitations of Raw NodePorts in Cloud Environments If you deploy your applications in a public cloud environment (such as AWS, GCP, or Azure) and expose them using NodePort services on high-range ports like 30008, you run into production limitations.…

Kubernetes

Article 17 – Namespaces: Logical Multi-Tenancy and Resource Quotas

The Security and Resource Risks of a Flat Cluster If you run different environments (like Development, Testing, and Production) on a single cluster without boundaries, you face operational risks. For instance, developers might choose conflicting resource names, preventing workloads from…

Kubernetes

Article 15 – Services – ClusterIP: Internal Cluster Communication

Tracking Ephemeral Pod IPs Internally In a multi-tier application architecture, internal service discovery is a primary concern. The frontend web server needs to talk to the backend API, and the API needs to query the database. However, pods are temporary.…

Kubernetes

Article 14 – Services – NodePort: Exposing Apps to the Outside

The Isolated Overlay Network Every pod in your CNI network receives an IP address. However, these IPs are assigned from a private overlay network managed by the Container Network Interface (CNI). While pods can communicate with each other using these…

Kubernetes

Article 13 – Deployments: Declarative Application Lifecycles

The Downtime Risks of Manual Upgrades Suppose you have a running ReplicaSet managing three instances of your application at version 1.0. Your development team releases version 2.0. If you only use a standard ReplicaSet, updating the application is a manual…

Kubernetes

Article 11 – Declarative Pods with YAML: Writing Your First Spec

The Friction of Command-Line Infrastructure When starting out with containers, you often configure everything using CLI flags. You run commands like: docker run -d –name my-app -p 80:80 -v /var/data:/data –restart=always my-image:v2 While this is quick for local testing, it…

Kubernetes

Article 10 – Pods: The Smallest Atom of Compute

The Isolation Friction of Multi-Container Apps If you are used to working with standalone containers, you treat a single container as your basic unit of deployment. You run a container for your app, and you scale it by spinning up…

Kubernetes

Article 09 – Kube Proxy: The Traffic Director

Routing Traffic to Transient Targets In Kubernetes, pods are temporary. They are created, scale up, crash, and get replaced. Each time a pod is recreated, it receives a new IP address. If you configure your application to talk to backend…