https://elijahu.me/portfolio/tags/automation/Infrastructure & Cloud Engineering portfolio by Elijah Udom (elijahu) — AWS, Kubernetes, eBPF Security, AI/ML Infrastructure, and Platform Engineering projects.Hugo -- gohugo.ioenWed, 17 Dec 2025 00:00:00 +0000https://elijahu.me/portfolio/projects/kodekloud-days-9-12/Wed, 17 Dec 2025 00:00:00 +0000https://elijahu.me/portfolio/projects/kodekloud-days-9-12/“Every K8s node is a Linux host. Every database that won’t start has a reason in the logs. Every ’no route to host’ is a firewall issue until proven otherwise.” Context: This series is a deliberate return to Linux fundamentals before going deeper into kernel-level work — CentOS, MariaDB, SELinux, Ansible. The stuff that runs silently under every K8s cluster and eBPF probe. Owning it isn’t optional. Four problems this week: a MariaDB instance that wouldn’t start due to a corrupted data directory, a backup automation task requiring passwordless SSH, a Tomcat WAR deployment with a custom port, and a two-layer port conflict that required both evicting a rogue Sendmail process and adding an iptables rule before Apache was reachable.https://elijahu.me/portfolio/projects/kodekloud-days-5-8/Tue, 16 Dec 2025 00:00:00 +0000https://elijahu.me/portfolio/projects/kodekloud-days-5-8/“Before going deeper into kernel-level work, I went back to Linux fundamentals. This is what runs under every K8s cluster and eBPF probe — owning it isn’t optional.” This series is a deliberate return to Linux fundamentals before going deeper into kernel-level work — CentOS, SELinux, Ansible, SSH. The stuff that runs silently under every K8s cluster and eBPF probe. Owning it isn’t optional. Four problems this week: SELinux configuration on a RHEL-based system, cron job automation, passwordless SSH across multiple servers, and Ansible version management for global availability.https://elijahu.me/portfolio/projects/kodekloud-days-1-4/Mon, 15 Dec 2025 00:00:00 +0000https://elijahu.me/portfolio/projects/kodekloud-days-1-4/“Before going deeper into kernel-level work, I went back to Linux fundamentals. This is what runs under every K8s cluster and eBPF probe — owning it isn’t optional.” This series is a deliberate return to Linux fundamentals before going deeper into kernel-level work — CentOS, user management, SSH hardening, permissions. The stuff that runs silently under every K8s cluster and eBPF probe. Owning it isn’t optional. Four problems this week: non-interactive user creation, temporary account expiry, disabling root SSH across multiple servers, and file permission management.