28 articles
DNS translates domain names into IP addresses in milliseconds. Trace the full resolution chain step by step, learn every record type, and debug common failures like NXDOMAIN and SERVFAIL.
eBPF enables kernel-level observability without application code changes. Learn how Cilium, Pixie, Falco, and bpftrace use eBPF for network monitoring, security, profiling, and tracing in production Kubernetes environments.
Trace a packet through the entire Linux networking stack: socket buffers, the TCP state machine, IP routing, netfilter/iptables, traffic control, and NIC drivers with practical diagnostic tools.
Learn the USE method for systematic Linux performance analysis. Master vmstat, iostat, sar, ss, strace, and perf with three real-world troubleshooting scenarios for CPU, memory, and disk bottlenecks.
Understand Linux process fundamentals: fork() and exec() for process creation, the parent-child tree, signals like SIGTERM and SIGKILL, zombie processes, the /proc filesystem, and essential debugging tools.
Master systemd unit files, dependency ordering with Wants/Requires/After, timer units as cron replacements, socket activation, and diagnostic tools like journalctl and systemd-analyze blame.
A comprehensive guide to BGP covering autonomous systems, route selection, BGP hijacking, RPKI, anycast routing, and how 75,000 independent networks form a single navigable internet.
A practical comparison of TCP and UDP covering connection overhead, head-of-line blocking, congestion control, and exactly when to choose speed over reliability in your applications.
Build the mental model for Linux file permissions from scratch. Learn chmod octal and symbolic notation, chown, umask, setuid/setgid/sticky bits, and POSIX ACLs with real-world scenarios.
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