Step-by-step Linux, Kubernetes and cloud tutorials drawn from over 10 years of keeping production environments running. Every command tested, nothing hand-waved.
Set up a self-hosted GitHub Actions runner on Ubuntu and AlmaLinux, register it, run a real job, and watch it survive a reboot. Includes a real AlmaLinux 10 bug.
Continue Reading →Set up nginx as a load balancer with real config and real output: round robin, weighted round robin, least_conn, ip_hash sticky sessions, passive health checks, SSL termination, WebSocket proxying and per-backend logging.
Continue Reading →The full progression from Let’s Encrypt and Certbot on Nginx with automatic renewal, to cert-manager and Kubernetes Ingress. Real terminal output, including the two failures beginners actually hit.
Continue Reading →How to read ping, traceroute and mtr output on Linux: packet loss, jitter, path MTU with ping -M do, why traceroute asterisks are often a false alarm, and a real troubleshooting workflow on Ubuntu 24.04 and RHEL 9.
Continue Reading →How to search Linux logs fast with grep, zgrep, journalctl and ripgrep: rotated .gz files, time windows, top-IP reports and the traps, on Ubuntu 24.04 and RHEL 9.
Continue Reading →A bottom-up method for Linux network troubleshooting: link and ARP, routing, then a live demo of refused versus firewall-filtered connections, then DNS. Real output on Ubuntu 24.04 and RHEL 9.
Continue Reading →CIDR notation, subnet masks, the block-size trick, VLSM and supernetting, worked with real ipcalc, sipcalc, Python and ip route output on Ubuntu 24.04 and RHEL 9.
Continue Reading →What an AWS VPC is made of: CIDR blocks, public and private subnets, route tables, internet and NAT gateways, security groups vs NACLs, endpoints, peering and what it all costs, with real CLI output.
Continue Reading →A hands-on Linux server hardening checklist for Ubuntu 24.04 and RHEL 10: SSH, sudo, firewall, sysctl, auditd, AIDE and CIS scans, with real output.
Continue Reading →The journalctl commands worth knowing: filter by unit, time and priority, follow logs live, and why your logs vanish after a reboot.
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