Too many open files

    While running apt commands or restarting the service,  getting a Failed to allocate directory watch: Too many open files error.

    You can see the current limits with sysctl fs.inotify. On debian , with the defaults, these are as follows:

    fs.inotify.max_queued_events = 16384
    fs.inotify.max_user_instances = 128
    fs.inotify.max_user_watches = 65536

    To fix the problem,  create a conf file /etc/sysctl.d/60-fs-inotify.conf with the following contents:

    fs.inotify.max_queued_events = 32768
    fs.inotify.max_user_instances = 512
    fs.inotify.max_user_watches = 524288

    To reload the new settings, you need to run :

    sudo sysctl --system


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