inotify-instances-exhausted-by-docker-shims
Root user hit exactly 128 inotify instances (system default), saturating the limit because each Docker container shim consumes one instance. This surfaces as EMFILE errors when starting Node.js services (not a file descriptor limit). Fix: raise fs.inotify.max_user_instances to 512 via /etc/sysctl.d/99-inotify.conf and sysctl -p.
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