[Dovecot] fd limit 1024 is lower in dovecot-1.1.1

[Zhang Huangbin]

Jack Stewart wrote:
>
>
> Zhang Huangbin wrote:
>> Daniel L. Miller wrote:
>>> Zhang Huangbin wrote:
>>>> Hi, all.
>>>>
>>>> I just upgrade from 1.0.15 to 1.1.1 in a test box(RHEL 5.2, x86_64).
>>>>
>>>> after upgrade, i got this warning msg:
>>>>
>>>> ----8< ----
>>>> # /etc/init.d/dovecot restart
>>>> Stopping Dovecot Imap:                                     [  OK  ]
>>>> Starting Dovecot Imap: Warning: fd limit 1024 is lower than what 
>>>> Dovecot can use under full load (more than 1280). Either grow the 
>>>> limit or change login_max_processes_count and max_mail_processes 
>>>> settings
>
>>> I'm just guessing - but reading that warning it appears to me that 
>>> Dovecot is saying that as it is configured, it can consume more O/S 
>>> resources (I assume fd is "file descriptors") than the O/S is 
>>> currently configured for.  So you need to DECREASE your dovecot max 
>>> processes to decrease the (potential) system demands - or increase 
>>> your O/S settings.
>>>
>>> Daniel
>>>
>>
>> I think so.
>>
>> I just decrease the processes, it works now.
>>
>
> Hi,
>
> Just as an FYI, for some versions of linux (i.e. RHE) you need to set 
> the process limit - ulimit unlimited is not enough. 1024 is the 
> default number of open file descriptors.
>
> One of the ways to solve this is by running 'ulimit -n X' in your init 
> script before starting the program. Within RHE, another way is to 
> configure /etc/security/limits.conf by putting something like this 
> into the file:
>
> *    hard    locks     8192
> *    hard    nofile    8192
> *    soft    locks     4096
> *    soft    nofile    4096
>
> This allows for processes to run with 4096 file descriptors by default 
> and the user process can increase it to 8192 via ulimit. 
> /etc/security/limits.conf can also be configured on a per user basis 
> which is also nice.
>
Thanks Jack. I will test it later. ^_^

I just comment the 'max_processes' variable in dovecot.conf now.

-- 
Best Regards.

Zhang Huangbin

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