# Best Practices (HA, security, cost)

Practical guidance for reliable and efficient clusters.

## High availability 🛡️

* Use **multiple node pools** across zones (if supported)
* Run **≥3 nodes** for production workloads
* Prefer **stateless** services; use readiness/liveness probes

## Security 🔐

* Enforce **RBAC** and least-privilege
* Apply **NetworkPolicies**; restrict egress where possible
* Keep clusters at **N / N-1**; patch base images regularly
* Store secrets in a secure provider; rotate tokens/certs

## Cost 💰

* Right-size requests/limits; use **HPA/VPA**
* Autoscale node pools; scale to zero for dev jobs if supported
* Choose storage **tiers** to match I/O needs


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