6 — DNS

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 — Linux Internals Every SRE Must Know

The kernel-level mental model — syscalls, the VFS, the scheduler — that turns 'the server is slow' from a guess into a diagnosable claim.

10 — gRPC

Why internal service-to-service calls increasingly run on gRPC instead of REST, and the deadline propagation and streaming semantics that change how you debug a slow call chain.

11 — TLS and Certificates

The handshake, cipher negotiation, and certificate chain validation that fail silently until an expiry takes down a service nobody remembered depended on it.

12 — Load Balancers

L4 vs L7 load balancing, health check design, and why a load balancer's own failure mode is often the single biggest blast radius in the stack.