12 — Immutable Infrastructure

Site Reliability Engineering: From Foundations to Internet-Scale Systems

The complete 184-chapter, 15-part Site Reliability Engineering curriculum — from Linux internals and distributed-systems theory through reliability engineering, observability, incident response, platform engineering, and Staff/Principal-level MAANG interview preparation, ordered the way SRE expertise actually develops rather than as a topic index.

1 — Virtual Machines

The hypervisor-level isolation and resource accounting that containers still inherit assumptions from, and where VM-level failure domains differ from container ones.

10 — Multi-Region Deployments

Active-active vs. active-passive across regions, and the data-replication latency that ultimately caps how 'active' active-active can really be.

11 — Infrastructure as Code

Why declarative infra state, not scripts, is what makes an environment reproducible — and the drift between declared and actual state that erodes that guarantee over time.

13 — GitOps

Git as the single source of truth for cluster state, and the reconciliation loop that makes 'what's actually running' a query instead of a guess.