24-Part Ever-Expanding Series
All Articles in This Series
A structured journey from hardware fundamentals to container orchestration internals — covering Linux, OS internals, networking, cryptography, security, and systems debugging. New parts published regularly.
Part 1
What Is a Computer System?
The layers of computing from hardware to user, CPU and memory internals, I/O, interrupts, and system calls — the mental model every engineer needs.
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Part 2
How Programs Actually Run
From source code to CPU execution — compilation, ELF binaries, dynamic linking, the loader, and how a process comes to life in memory.
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Part 3
Linux Fundamentals — Architecture & Philosophy
Why Linux dominates, kernel architecture, the boot sequence, systemd, the Unix philosophy, and the Filesystem Hierarchy Standard.
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Part 4
Essential Linux Command Line Mastery
Navigation, file operations, text processing with grep/sed/awk, pipelines, redirections, and the tools that make Linux powerful.
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Part 5
Process Management — Lifecycle, Scheduling & IPC
The fork/exec model, process states, the CFS scheduler, signals, and IPC mechanisms from pipes to shared memory.
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Part 6
Memory Management — Virtual Memory, Paging & cgroups
Virtual memory, page tables, the TLB, heap allocation via brk/mmap, the OOM killer, and cgroups memory limits.
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Part 7
File Systems & Storage — inodes, ext4 & OverlayFS
inodes, ext4 on-disk layout, journaling, the VFS layer, OverlayFS for containers, LVM, and mounting.
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Part 8
Linux Permissions & Security Model
Unix permission model, chmod/chown, ACLs, Linux capabilities, seccomp, SELinux/AppArmor, and container security.
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Part 9
Shells & Advanced Bash Scripting
Shell internals, Bash scripting patterns, job control, subshells, process substitution, and production-grade scripts.
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Part 10
Networking Fundamentals — OSI Model & IP Addressing
The OSI model, IP addressing, CIDR subnetting, ARP, the Linux network stack, interfaces, and essential networking tools.
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Part 11
TCP/IP & UDP Deep Dive
The three-way handshake, TCP connection states, flow and congestion control, UDP, and socket programming.
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Part 12
DNS Deep Dive — Resolution & Record Types
Recursive resolution, every DNS record type, caching and TTL, zones, and debugging with dig.
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Part 13
HTTP/HTTPS & TLS — The Web Protocol Stack
HTTP request/response, status codes, headers, HTTP/2 & HTTP/3, the TLS 1.3 handshake, and debugging with curl.
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Part 14
Routing, NAT & Linux Firewalls
Linux routing tables, NAT/masquerading, iptables chains, nftables, and the netfilter packet pipeline.
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Part 15
Load Balancing & Reverse Proxies
L4 vs L7 load balancing, NGINX and HAProxy configs, health checks, and session persistence.
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Part 16
Cryptography Fundamentals
Symmetric and asymmetric encryption, hashing, digital signatures, key exchange, and OpenSSL in practice.
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Part 17
TLS/SSL Deep Dive — PKI & Certificates
Certificate authorities, X.509 certs, chain of trust, mTLS, Let's Encrypt, and OpenSSL workflows.
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Part 18
SSH & Secure Remote Access
Key authentication, SSH config, local/remote/dynamic tunneling, agent forwarding, and hardening.
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Part 19
Authentication & Authorization — Tokens, RBAC & OAuth
OAuth 2.0 flows, JWT anatomy, RBAC models, OIDC, API keys, and the identity stack behind every login.
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Part 20
Secrets Management — Vault & Key Rotation
HashiCorp Vault, cloud KMS, secret rotation, sealed secrets, and why env vars aren't enough.
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Part 21
How Containers Actually Work — Namespaces & cgroups
Linux namespaces, cgroups, OverlayFS, building a container from scratch, and Docker architecture.
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Part 22
Kubernetes Networking Foundations
Pod networking, Services, CNI plugins, Ingress controllers, NetworkPolicies, and CoreDNS.
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Part 23
Linux Debugging & Troubleshooting Tools
strace, lsof, tcpdump, ss, dmesg, journalctl, /proc, and systematic debugging methodology.
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Part 24
Performance Analysis — CPU, Memory, Disk & Network
The USE method, CPU/memory/disk/network profiling, flame graphs, and the 60-second analysis checklist.
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