In memory-constrained environments, the Linux OOM Killer decides what lives and what gets killed. This guide shows how to protect critical processes like sshd and mysqld using oom_score_adj values, with a script that applies them reliably and securely. Make memory pressure predictable and survivable.

A 2012 Linux kernel bug caused CPU lockups after 208.5 days of uptime due to an integer overflow in sched_clock(). Affecting RHEL 5 and 6, it exposed the risks of long uptimes, underscoring the importance of timely patching, uptime observability, and operational risk management in DevSecOps.

In 2012, a single leap second triggered global outages across Reddit, Yelp, and more. This retrospective unpacks how fragile timekeeping broke Java apps at scale, and what DevOps, SRE, and distributed systems teams can do today to avoid repeating history.