Introduction: The 7.6 GB VPS Swap Fire with Docker This morning, as I sat down at my computer, I was met with an unexpected performance drop on one of my servers. The Docker containers running on a relatively modest VPS with 7.6 GB of RAM suddenly became sluggish, and some services even became inaccessible. A quick inspection revealed that the root cause of the problem was aggressive swap usage. Swap usage with Docker on a small VPS is a serious issue that can lead to performance problems and system instability. These issues can become even more profound, especially when certain kernel modules are missing or misconfigured. In this post, I will detail the steps I took in such a scenario, how I found the root cause of the problem, and how I ultimately reached a solution with a kernel patch. My goal is to provide a practical guide for system administrators and developers facing similar issues.…