Learn how to securely verify Elasticsearch snapshots without using manage_snapshot, using a minimal API key, Prometheus-compatible script, and hardened monitoring practices. Includes a GitHub tools repo for automation.

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.