Practical IT infrastructure, Linux server management, DevOps, and system administration guides.https://dowithsudo.com/en-ushttps://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. A case study on how a compromised VM can attack the hypervisor host from inside 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 experience facing a DDoS attack that crippled an office network and how MikroTik RouterOS became the defense weapon 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 response is very slow. Investigation process from 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/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/linux-server-hardening-best-practices/https://dowithsudo.com/blog/linux-server-hardening-best-practices/A detailed, practical guide to securing your production Linux servers. Learn SSH hardening, firewall management, user security, and intrusion prevention strategies.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-ansible-from-scratch/https://dowithsudo.com/blog/learning-ansible-from-scratch/A comprehensive guide to Ansible automation for IT pros. Learn how to manage servers at scale using inventories, playbooks, and roles for efficient operations.Thu, 22 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/learning-docker-from-scratch/https://dowithsudo.com/blog/learning-docker-from-scratch/A friendly guide to mastering Docker. From basic concepts to Dockerfiles and Docker Compose. No more 'It works on my machine' drama! Find a concise.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 resource deployment. Simple, practical, and repeatable.Thu, 22 Jan 2026 00:00:00 GMT