Practical IT infrastructure, Linux server management, DevOps, and system administration guides.https://dowithsudo.com/en-ushttps://dowithsudo.com/blog/docker-vs-kubernetes/https://dowithsudo.com/blog/docker-vs-kubernetes/Docker vs Kubernetes compared with honest trade-offs. Learn when Docker Compose is enough, when Kubernetes earns its complexity, and how to choose.Mon, 10 Aug 2026 00:00:00 GMThttps://dowithsudo.com/blog/aws-free-tier-status/https://dowithsudo.com/blog/aws-free-tier-status/How to check your AWS free tier status and eligibility. Track usage, read the free tier dashboard, and avoid surprise charges.Mon, 10 Aug 2026 00:00:00 GMThttps://dowithsudo.com/blog/docker-complete-guide/https://dowithsudo.com/blog/docker-complete-guide/The complete Docker guide: containers, images, Dockerfiles, volumes, networks, Compose, and production best practices from a 15-year sysadmin.Mon, 10 Aug 2026 00:00:00 GMThttps://dowithsudo.com/blog/build-docker-container-from-scratch/https://dowithsudo.com/blog/build-docker-container-from-scratch/Step-by-step guide to building a Docker container from scratch using scratch images and multi-stage builds. Create minimal, secure, production-ready images.Mon, 10 Aug 2026 00:00:00 GMThttps://dowithsudo.com/blog/how-long-does-it-take-to-learn-docker/https://dowithsudo.com/blog/how-long-does-it-take-to-learn-docker/How long does it take to learn Docker? A realistic week-by-week timeline for beginners, developers, and sysadmins, plus the fastest path to production skills.Mon, 10 Aug 2026 00:00:00 GMThttps://dowithsudo.com/blog/lvm-pvscan-not-finding-disk/https://dowithsudo.com/blog/lvm-pvscan-not-finding-disk/pvscan not finding disk? Diagnose why LVM misses a physical volume and recover your volume group with this practical troubleshooting guide.Mon, 10 Aug 2026 00:00:00 GMThttps://dowithsudo.com/blog/proxmox-security-cves-patching/https://dowithsudo.com/blog/proxmox-security-cves-patching/Proxmox security matters. Learn which CVEs hit Proxmox VE, how to check your exposure, and how to patch safely without downtime.Mon, 10 Aug 2026 00:00:00 GMThttps://dowithsudo.com/blog/terraform-vs-ansible/https://dowithsudo.com/blog/terraform-vs-ansible/Terraform vs Ansible compared. Understand the difference between provisioning and configuration management, and which one to learn first.Mon, 10 Aug 2026 00:00:00 GMThttps://dowithsudo.com/blog/hybrid-cloud-migration-case-study/https://dowithsudo.com/blog/hybrid-cloud-migration-case-study/A real case study migrating production workloads from legacy on-premise to hybrid-cloud with zero downtime. Step-by-step strategy, architecture, and lessons.Thu, 23 Jul 2026 00:00:00 GMThttps://dowithsudo.com/blog/email-deliverability-spf-dkim-dmarc-case-study/https://dowithsudo.com/blog/email-deliverability-spf-dkim-dmarc-case-study/A real case study fixing email deliverability where SPF, DKIM, and DMARC passed but emails still landed in spam. Root cause analysis and step-by-step solution.Thu, 23 Jul 2026 00:00:00 GMThttps://dowithsudo.com/blog/proxmox-vm-attack-hypervisor/https://dowithsudo.com/blog/proxmox-vm-attack-hypervisor/VM isolation is the key to Proxmox security. How a compromised VM attacks the hypervisor from the local network, and how to prevent it.Sun, 01 Feb 2026 00:00:00 GMThttps://dowithsudo.com/blog/server-linux-pivot-attack/https://dowithsudo.com/blog/server-linux-pivot-attack/A real-world case study tracing a seemingly normal Linux server quietly hijacked as a pivot point for cyberattacks. Learn detection and mitigation strategies.Sun, 01 Feb 2026 00:00:00 GMThttps://dowithsudo.com/blog/cloud-learning-tips-beginner/https://dowithsudo.com/blog/cloud-learning-tips-beginner/A practical guide to starting your cloud computing journey. From choosing a provider, understanding core concepts, to building an attractive portfolio.Sun, 25 Jan 2026 00:00:00 GMThttps://dowithsudo.com/blog/ddos-mikrotik-case-study/https://dowithsudo.com/blog/ddos-mikrotik-case-study/A real DDoS attack that crippled an office network, and how MikroTik RouterOS became the defense with firewall rules and traffic shaping.Sun, 25 Jan 2026 00:00:00 GMThttps://dowithsudo.com/blog/aws-free-tier-billing-trap/https://dowithsudo.com/blog/aws-free-tier-billing-trap/A real experience with AWS bills exploding due to free tier misconfiguration. Learn how to avoid hidden cost traps and tips for effective budget monitoring.Sun, 25 Jan 2026 00:00:00 GMThttps://dowithsudo.com/blog/cloudflare-tunnel-vs-port-forwarding/https://dowithsudo.com/blog/cloudflare-tunnel-vs-port-forwarding/An in-depth comparison between Cloudflare Tunnel and traditional port forwarding. Learn why zero-trust networking is more secure and how to implement it.Sun, 25 Jan 2026 00:00:00 GMThttps://dowithsudo.com/blog/mern-migration-digitalocean/https://dowithsudo.com/blog/mern-migration-digitalocean/A real experience moving a MERN application from an office server to DigitalOcean. Step by step process, challenges faced, and lessons learned.Sun, 25 Jan 2026 00:00:00 GMThttps://dowithsudo.com/blog/monitoring-importance-tools-comparison/https://dowithsudo.com/blog/monitoring-importance-tools-comparison/A real experience about the importance of IT infrastructure monitoring. Comparison of popular monitoring tools and a guide to choosing what fits your needs.Sun, 25 Jan 2026 00:00:00 GMThttps://dowithsudo.com/blog/webserver-cloud-intermittent-slow/https://dowithsudo.com/blog/webserver-cloud-intermittent-slow/A debugging experience with a web server experiencing intermittent downtime. Load looks normal but responses are very slow. Investigation start to resolution.Sun, 25 Jan 2026 00:00:00 GMThttps://dowithsudo.com/blog/basic-linux-system-administrator/https://dowithsudo.com/blog/basic-linux-system-administrator/A practical basic Linux guide for system administrators: permissions, processes, logs, disk, networking, and a safe troubleshooting mindset for production.Sat, 24 Jan 2026 00:00:00 GMThttps://dowithsudo.com/blog/docker-container-crash-case-study/https://dowithsudo.com/blog/docker-container-crash-case-study/A real-world account of handling a critical server incident where Docker containers kept crashing. Learn deep-dive diagnostics for OOMKilled errors, startup.Thu, 22 Jan 2026 00:00:00 GMThttps://dowithsudo.com/blog/it-support-comfort-zone-reflection/https://dowithsudo.com/blog/it-support-comfort-zone-reflection/A brutally honest reflection on becoming 'too comfortable' in IT Support, the danger of being a forever-generalist, and knowing when it's time to level up.Thu, 22 Jan 2026 00:00:00 GMThttps://dowithsudo.com/blog/learning-docker-from-scratch/https://dowithsudo.com/blog/learning-docker-from-scratch/Install Docker, run your first container, and build your first image in 30 minutes. A hands-on on-ramp for developers new to containerization.Thu, 22 Jan 2026 00:00:00 GMThttps://dowithsudo.com/blog/learning-ansible-from-scratch/https://dowithsudo.com/blog/learning-ansible-from-scratch/Practical Ansible guide for IT pros. Learn how to manage servers at scale with inventories, playbooks, and roles for efficient operations.Thu, 22 Jan 2026 00:00:00 GMThttps://dowithsudo.com/blog/linux-server-hardening-best-practices/https://dowithsudo.com/blog/linux-server-hardening-best-practices/A practical guide to securing production Linux servers. SSH hardening, firewall management, user security, and intrusion prevention.Thu, 22 Jan 2026 00:00:00 GMThttps://dowithsudo.com/blog/lvm-error-case-study-pvs-lvs/https://dowithsudo.com/blog/lvm-error-case-study-pvs-lvs/A real-world account of recovering a production server with failed LVM storage. Step-by-step guide to diagnosing unknown device errors and restoring access.Thu, 22 Jan 2026 00:00:00 GMThttps://dowithsudo.com/blog/learning-terraform-from-scratch/https://dowithsudo.com/blog/learning-terraform-from-scratch/A complete guide to learning Infrastructure as Code (IaC) with Terraform. From basic concepts to your first deployment. Simple, practical, repeatable.Thu, 22 Jan 2026 00:00:00 GMT