Fixing qBittorrent in Docker, swallowing RAM and locking up the host

IntroI’ve had qBittorrent running happily in Docker for over a year now, using the linuxserver/qbittorrent image. I run the docker container and others on an Ubuntu Server host. Recently, the host regularly becomes unresponsive. SSH doesn’t work, and the only way to recover is to power cycle the server (running on a small NUC). The symptoms were: RAM usage would climb and climb, the server would become sluggish, and then it would completely lock up.

• #docker
• #fixing