[Dovecot] questions about process_limit

[Jochen Bern]

On -10.01.-28163 20:59, Andreas Meyer wrote:
> What is the best way to avoid this process_limit errors and configure
> dovecot the best way?

Which limits exactly your users' activities count against depends on
what protocols they're using. (Example: N parallel IMAPS connections
with (default setting) *individual* imap-login processes require the
process_limit of the imap and imap-login services to be at least N,
occupy 2xN in the client_limit of the auth service, and need the
client_limit of the anvil service to be at least about N+100.) Your "fd
limit (ulimit -n)" warning is about an adjustment you must make in the
OS' config (the exact place/method, in turn, being distrib dependent).
Note that a single client may well hold *several* IMAP(S) connections
open in parallel, too. And that your server will need to have the CPU
and RAM to run that many processes ...

How much overhead you're willing to provide beyond the current (or
expected, or theoretical-max) needs of your users is up to you to
decide, but since there's always the possibility of some malfunction or
attack tearing into your limited ressources, you should *monitor* the
usage, anyway.

Kind regards,
								J. Bern
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