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·
Linux
Essential Linux skills for developers and sysadmins. File permissions, shell scripting, process management, systemd services, and server hardening best practices.
7 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·
Linux
Linux File Permissions Explained: chmod, chown, and ACLs
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.
12 min read·