Linux
Bash Scripting Best Practices for DevOps Engineers
Write reliable bash scripts with set -euo pipefail, proper quoting, [[ ]] tests, idempotent patterns, cleanup traps, ShellCheck, and knowing when to switch to Python.
10 min read·
Latest Articles
Linux
The Linux Networking Stack: From Socket to NIC
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.
10 min read·
Linux
Linux Performance Troubleshooting: A Systematic Approach
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.
10 min read·
Linux
cgroups and Namespaces: The Building Blocks of Containers
Understand the Linux kernel features behind containers. Learn namespaces for PID, network, and mount isolation, cgroups for CPU and memory limits, and how to build a container by hand with unshare and nsenter.
10 min read·
Linux
How Linux Processes Work: Fork, Exec, Signals, and Zombies
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.
10 min read·
Linux
systemd Demystified: Services, Timers, and Targets
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.
9 min read·
Networking
What is BGP? The Protocol That Runs the Internet
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.
11 min read·
Networking
Understanding CIDR Notation and Subnetting (Without the Pain)
A practical guide to CIDR notation and subnetting covering binary IP math, prefix lengths, private ranges, VPC CIDR carving, and Kubernetes subnet sizing with worked examples.
9 min read·
Networking
Load Balancing Algorithms: Round Robin, Least Connections, and More
A practical guide to load balancing algorithms -- round robin, least connections, IP hash, consistent hashing, and power of two choices -- with nginx and HAProxy configurations.
10 min read·