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Top Forums UNIX for Dummies Questions & Answers getting postfix tyo start automatically Post 21635 by killerserv on Monday 20th of May 2002 08:07:46 PM
Old 05-20-2002
When you increase the number of Postfix processes into the hundreds, the kernel will eventually run out of file handles; after that it is likely to run out of process slots.
The following information is kernel version dependent.

To set parameters at boot time on Linux systems that have /etc/sysctl.conf, add the following lines:

fs.file-max = 16384
kernel.threads-max = 2048

To set kernel parameters at run time, execute the following commands as root:

# echo 16384 > /proc/sys/fs/file-max
# echo 2048 > /proc/sys/kernel/threads-max

Hope this helps.

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POSTQUEUE(1)						      General Commands Manual						      POSTQUEUE(1)

postqueue - Postfix queue control SYNOPSIS
postqueue [-c config_dir] -f postqueue [-c config_dir] -p postqueue [-c config_dir] -s site DESCRIPTION
The postqueue program implements the Postfix user interface for queue management. It implements all the operations that are traditionally available via the sendmail(1) command. The following options are recognized: -c config_dir The main.cf configuration file is in the named directory instead of the default configuration directory. See also the MAIL_CONFIG environment setting below. -f Flush the queue: attempt to deliver all queued mail. This option implements the traditional sendmail -q command, by contacting the Postfix qmgr(8) daemon. -p Produce a traditional sendmail-style queue listing. This option implements the traditional mailq command, by contacting the Postfix showq(8) daemon. -s site Schedule immediate delivery of all mail that is queued for the named site. The site must be eligible for the "fast flush" service. See flush(8) for more information about the "fast flush" service. This option implements the traditional sendmail -qRsite command, by contacting the Postfix flush(8) daemon. -v Enable verbose logging for debugging purposes. Multiple -v options make the software increasingly verbose. SECURITY
This program is designed to run with set-group ID privileges, so that it can connect to Postfix daemon processes. DIAGNOSTICS
Problems are logged to syslogd(8) and to the standard error stream. ENVIRONMENT
MAIL_CONFIG Directory with the main.cf file. In order to avoid exploitation of set-group ID privileges, it is not possible to specify arbitrary directory names. A non-standard directory is allowed only if the name is listed in the standard main.cf file, in the alternate_config_directories configuration parameter value. Only the super-user is allowed to specify arbitrary directory names. FILES
/var/spool/postfix, mail queue /etc/postfix, configuration files CONFIGURATION PARAMETERS
import_environment List of names of environment parameters that can be imported from non-Postfix processes. queue_directory Top-level directory of the Postfix queue. This is also the root directory of Postfix daemons that run chrooted. fast_flush_domains List of domains that will receive "fast flush" service (default: all domains that this system is willing to relay mail to). This list specifies the domains that Postfix accepts in the SMTP ETRN request and in the sendmail -qR command. SEE ALSO
sendmail(8) sendmail-compatible user interface qmgr(8) queue manager showq(8) list mail queue flush(8) fast flush service LICENSE
The Secure Mailer license must be distributed with this software. AUTHOR(S) Wietse Venema IBM T.J. Watson Research P.O. Box 704 Yorktown Heights, NY 10598, USA POSTQUEUE(1)

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