Summary

In today’s IT landscape, HA and reliability are critical for keeping systems operational. In this chapter, we explored how Kubernetes ensures HA, reliability, and resiliency at both the infrastructure and application levels.

HA ensures your system remains up even when parts of the infrastructure fail. Techniques such as using multi-control-plane control planes, etcd clustering, and load balancing ensure continuous operation. Reliability, on the other hand, focuses on consistent performance over time, ensuring that applications avoid slowdowns or errors under load. Resiliency is about recovering quickly from failures using self-healing mechanisms such as automatic Pod restarts and fallback systems.

We also covered node pools, autoscaling, Pod affinity/anti-affinity, taints and tolerations, and PDBs to ensure efficient resource distribution, avoid disruptions, and maintain high performance during maintenance and scaling events.

However, none of these strategies...