rails - rails 6 由于gem listen 报错 Listen error: unable to monitor directories for changes
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参考: https://stackoverflow.com/questions/42225677/listen-error-unable-to-monitor-directories-for-changes
echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p
就可以了.