DevOps Deep Dives

Focused Linux / DevOps reference documents for interview prep, systems understanding, and production troubleshooting.

Linux Fundamentals

• linux.boot.sequence.md — firmware to userspace boot flow
• linux.memory.management.md — virtual memory, paging, OOM
• linux.network.packet.flow.md — NIC to application packet path
• linux.performance.debugging.md — perf, strace, sysstat toolkit

systemd

• systemd.architecture.md — PID 1, targets, boot ordering, component overview

Containers & Kubernetes

• containers.how.they.really.work.md — namespaces, cgroups, overlayfs
• docker.image.internals.md — layers, manifests, build cache
• kubernetes.pod.lifecycle.md — pod scheduling through termination
• kubernetes.networking.md — CNI, services, kube-proxy, DNS

Infrastructure & Cloud

• terraform.state.internals.md — state file, locking, backends
• ci.cd.pipeline.architecture.md — pipeline design, artifacts, environments

How to use these docs

• Read the "Big picture" section first.
• Use the ASCII flows to build the mental model.
• Use the "Failure modes" and "Debugging workflow" sections for practical troubleshooting.
• Use the "Interview angles" sections to prep answers that sound like you understand the system rather than memorized buzzwords.