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Error messages for postfix monitor

From: Alexandre Carlos Vilarinho de Oliveira
Subject: Error messages for postfix monitor
Date: Fri, 11 May 2012 12:05:38 -0300

Hello all,

I’m using monit to monit postfix services, but constantly I’m receiving alert messages that it cannot connect to postfix smtp port 25, as you can see the log message below.


failed protocol test [SMTP] at INET[localhost:25] via TCP -- SMTP: error receiving data -- Resource temporarily unavailable


connection succeeded to INET[localhost:25] via TCP


Is this normal? Why does it happen?


Follow the recent conf to monit postfix.


# postfix

check process postfix with pidfile /var/spool/postfix/pid/

    group mail

    start program = "/etc/init.d/postfix start"

    stop program  = "/etc/init.d/postfix stop"

    if cpu > 60% for 2 cycles then alert

    if cpu > 80% for 5 cycles then restart

    if totalmem > 200.0 MB for 5 cycles then restart

    if children > 250 then restart

    if loadavg(5min) greater than 10 for 8 cycles then stop

    if failed port 25 type tcp protocol smtp

       with timeout 15 seconds then alert

    if 3 restarts within 5 cycles then timeout

       depends on postfix_rc


 check file postfix_rc with path /etc/init.d/postfix

   group mail

   if failed checksum then unmonitor

   if failed permission 755 then unmonitor

   if failed uid root then unmonitor

   if failed gid root then unmonitor


Am I doing something wrong? I’ve base it on Monit’s wiki website conf.



Alexandre Vilarinho
Gerente de Engenharia de Rede IP/TI
Tel.: (55 11) 3017-4683
Cel.: (55 11) 7757-8388
Fax: (55 11) 3017-4464



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