Scaling and Monitoring an Application

Introduction to Kubernetes

Frank Heilmann

Platform Architect and Freelance Instructor

Scaling on Kubernetes

Scaling on Kubernetes

Scaling is a technique to add (scale up) or remove (scale down) resources:
- Scale up: react to increasing load
- Scale down: save resources
Scaling the number of Pods is easy:
- Either change the number of replicas in the Manifest and re-apply,
- Or use the command kubectl scale deployment ...
- with --replicas <number>

Scalability and Cloud Nativeness

An application needs to be designed for scalability
Legacy applications, in particular monoliths, are typically not scalable in the way shown here
Modern, cloud native applications are designed with the the goal to be easily scalable

Monitoring an Application

Monitoring: observing applications in real-time
- Enables reaction to all kind of problems
Examples of modern monitoring application for Kubernetes:
- Prometheus, Grafana, or kubectl
Here, we use kubectl for basic monitoring tasks

Typical command: kubectl get <object to be monitored>
Example 1: kubectl get pods returns all pods
Example 2: kubectl get services returns all services

Let's practice!

Introduction to Kubernetes

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