Modern applications run on complex stacks like containers, orchestration layers, cloud instances, microservices,all competing for memory. When memory pressure becomes critical, Linux activates a last-resort mechanism called the Kernal OOM Killer (Out-Of-Memory Killer). In production, this often shows up as a sudden crash with little warning, leaving engineers scrambling to understand what went wrong. Let’s break down what the Kernal OOM Killer really is, why it triggers, and how to prevent it. What Is the Kernal OOM Killer? The Linux kernel manages system memory. When available RAM and swap are …
