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If you run Linux in production for any significant amount of time, you have likely run into the "Linux Assassin" that is, the OOM (out-of-memory) killer. When Linux detects that the system is using too much memory, it will identify processes for termination and, well, assassinate them. The OOM killer has a noble role in ensuring a system does not run out of memory, but this can lead to unintended consequences.
For years the PostgreSQL community has made recommendations on how to set up Linux systems to keep the Linux Assassin away from PostgreSQL processes, which I will describe below. These recommendations carried forward from bare metal machines to virtual machines, but what about containers and Kubernetes?
Below is an explanation of experiments and observations I've made on how the Linux Assassin works in conjunction with containers and Kubernetes, and methods to keep it away from PostgreSQL clusters in your environment.
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