Noel Jones said the following on 01/08/2009 10:34 AM:
Postfix keeps idle processes around for $max_idle (default 100s), so
the process count is only an approximation of the number of
connections. Idle processes are reused $max_use (default 100) times
before they are retired. The number of processes will change with the
number of connections until the maximum number of configured
connections is reached. I suspect this is similar to what you get
when counting "sendmail" processes.
To get an accurate connection count, you will need to parse "netstat"
or "lsof" output to count established connections. Even this may give
an inaccurate number if there are more connections than available
smtpd processes.
I use this perl "one liner" on FreeBSD, you may need to adjust it for
another OS.
netstat -an 2>/dev/null | perl -lne '
$in = "0" if $in == undef;
$out = "0" if $out == undef;
++$in if (/ESTABLISHED/
&&
/(?:^|\s)\d+\.\d+\.\d+\.\d+[.:](\d+)\s+\d+\.\d+\.\d+\.\d+[.:]\d+/
&& $1 eq "25");
++$out if (/ESTABLISHED/
&&
/(?:^|\s)\d+\.\d+\.\d+\.\d+[.:]\d+\s+\d+\.\d+\.\d+\.\d+[.:](\d+)/
&& $1 eq "25");
END {print $ARGV[0], "Port 25 status: ", $in, " Established
incoming, ", $out, " Established outgoing"};
'
Parsing netstat seems to work. It doesn't need to be 100% accurate for
what I'm doing.
Thanks!
~Cory Coager
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