Re: ulimit -n vs client_limit vs process_limit

[Joseph Tam]

On Thu, 17 Dec 2020, Aki Tuomi wrote:

What should I set "ulimit -n" relative to client_limit? Or perhaps I've roofed

You need to adjust LimitNOFiles (or ulimit -n).  Dovecot needs more
file descriptors than just the ones used by imap-login process, so it
is a good idea to consider setting it to at least 3x time the value.

Thanks, good to know.

Out of curiosity, I did a snapshot of FD usage for dovecot's supervisory
processes:

        # for p in imap-login config log auth pop3-login stats dovecot anvil; do
        #       echo "$p \c"; ls /proc/`pgrep -f /$p`/fd | wc -l
        # done

        imap-login     357
        config      14
        log      38
        auth      22
        pop3-login      20
        stats     193
        dovecot     221
        anvil      18

I guess "dovecot" or "stat" are the particular processes that needs to
have FD limits set larger than to the sum of client_limits.

Joseph Tam <jtam.h...@gmail.com>