Linux

Commands Cheatsheet
22 Mar 2026 1,705 words · 9 min read #linux #cli #cheatsheet #commands #reference
A categorized quick reference for core Linux commands, with deprecated tools flagged and modern replacements listed. Covers file operations, text processing, process and user management, networking, archiving, package …
Cron
22 Mar 2026 1,717 words · 9 min read #automation #cron #linux #systemd #scheduling
Reference for the cron job scheduler: expression syntax, crontab management, environment handling, logging, debugging, systemd timer equivalents, and common pitfalls.
DeleteFilesOlderThan.sh
22 Mar 2026 606 words · 3 min read #automation #linux #cron #bash #find
A bash script that finds and deletes files older than 30 days in error and processed subdirectories under a given base path. Includes cron scheduling, a dry-run variant, and simplified single-command alternatives.
Disabling CTRL+ALT+F# Virtual Terminal Switching
22 Mar 2026 997 words · 5 min read #linux #security #xorg #wayland #tips-and-tricks
How to disable switching to Linux virtual terminals (Ctrl+Alt+F1 through F6) at the X11, Wayland, systemd-logind, kernel, and display-manager levels for kiosk and restricted environments.
DNS Encryption
22 Mar 2026 1,627 words · 8 min read #networking #dns #encryption #security #tls #linux
Protocols that encrypt DNS queries and responses: DNS over TLS (DoT), DNS over HTTPS (DoH), and DNS over QUIC (DoQ). Covers transport, ports, RFCs, a protocol comparison, and implementation examples for systemd-resolved, …
DNS Record Types
22 Mar 2026 1,915 words · 9 min read #networking #dns #dnssec #zone-files #bind #linux
Reference for common and specialized DNS resource record types, their syntax, and zone-file usage examples. Covers address, mail, security, service discovery, and DNSSEC records.
Docker CLI
22 Mar 2026 2,603 words · 13 min read #virtualization #docker #containers #linux #networking
Reference for the Docker command-line interface: container lifecycle, image management, builds, volumes, networking, resource constraints, backup, and troubleshooting.
etcd
22 Mar 2026 1,602 words · 8 min read #databases #etcd #kubernetes #raft #key-value-store #linux
Distributed key-value store built on Raft, used as the cluster state store for Kubernetes. Covers install, single-node and three-node cluster setup, TLS, RBAC, backup/restore, tuning, and monitoring.
Filesystem Creation
22 Mar 2026 1,428 words · 7 min read #storage #linux #filesystem #partitioning #fstab
Guide to partitioning disks with fdisk and parted, creating ext4/XFS/Btrfs/FAT32 filesystems, setting up swap and UEFI boot partitions, and configuring persistent mounts via fstab.
FirewallD
22 Mar 2026 1,775 words · 9 min read #networking #linux #firewall #firewalld #nftables
Reference for FirewallD, the dynamic firewall manager for Linux that uses zones and services on top of nftables. Covers zones, services, ports, rich rules, NAT, ICMP filtering, and troubleshooting.