smtpd process limit

Discussion in 'Server Operation' started by jonash, Oct 30, 2009.

  1. jonash

    jonash New Member

    I'm having a problem increasing the Postfix 2.5 smtpd process limit to 200. Here's what I have tried so far:

    default_process_limit = 200
    smtp      inet  n       -       -       -       200       smtpd
    smtp      inet  n       -       -       -       -       smtpd
       -o default_process_limit=200
    During heavy traffic or simulation (stress test), the number of smtpd processes reaches the default limit, whereupon the server stops accepting new connections:

    $ ps -u postfix | wc -l

    N.B. There are no other bottlenecks in this state (according to atop).

    Error messages:
    warning: process /usr/lib/postfix/smtpd pid 25834 exit status 1
    warning: /usr/lib/postfix/smtpd: bad command startup -- throttling
    setuid(105): Resource temporarily unavailable

    postfix        soft    nproc   200
    postfix        hard    nproc   300
    Could any of you give me a hint, please?
  2. jonash

    jonash New Member

    smtpd process limit [SOLVED]

    Well, evidently the directives in limits.conf are completely ignored in our distribution/setup.

    As a temporary solution, I placed "ulimit -u 300" in the Postfix init script.
    300 smtpd processes can now be spawned, even though the process limit in master is only 200 (!).

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