Trying To Find The Bottleneck, Is This IO Issue
Nov 16, 2008
Trying to find the bottleneck, is this IO issue?
Quote:
[~]# vmstat
procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu----- -
r b swpd free buff cache si so bi bo in cs us sy id wa st
2 0 78964 298804 252632 1228020 0 1 124 196 2 4 19 4 76 2 0
[~]# vmstat
procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------
r b swpd free buff cache si so bi bo in cs us sy id wa st
1 0 78964 298184 252648 1228084 0 1 124 196 2 4 19 4 76 2 0
[~]# iostat
Linux 2.6.18-92.el5 (server.net) 11/16/2008
avg-cpu: %user %nice %system %iowait %steal %idle
0.34 18.53 3.59 1.84 0.00 75.70
Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
sda 25.91 496.60 777.66 567980120 889443028
dm-0 105.74 495.16 772.46 566336450 883492896
dm-1 0.83 1.43 5.20 1640448 5950128
Server has a 1.85 load. I am trying to find if its an IO issue or not.
Any Linux tools that will help me find processes using up resources besides top? - It might be mysql as all invoked processes are PHP (suexec).
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Sep 4, 2008
Response time from my web server (running LAMP) was really slow this evening. mpstat showed nothing, CPU hovered under 5%, mem usage around 25%, iowait minimal. mysql processlist was mostly idle, no slow queries logged. Only other thing I can think of is the connection from the host itself? (Not my local connection as multiple users complained about slow performance.)
Concurrent users was higher than average, but shouldnt this manifest itself in higher CPU util?
My question was, is there something besides network latency I could be looking at? If it is network latency, what's the easiest way for me to confirm this? A simple ping?
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Apr 9, 2004
Someone posted some code similar to below, I made modifications or two after trying to detect PHP "nobody" users, after dumping a few printenv I found PHP exports PWD when calling an external program such sendmail. Basically the PWD will show the user directory that is coming from, which is enough to detect who is sending SPAM even as nobody! It's not 100% secure in that they could wipe /var/log/formmail but I don't imagine any spam will notice the logger, they presume any cPanel server (or other CP for that matter) is the same.
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pico /usr/bin/sendmail (paste the below code into it)
chmod +x /usr/bin/sendmail
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#!/usr/local/bin/perl
# use strict;
use Env;
my $date = `date`;
chomp $date;
open (INFO, ">>/var/log/formmail.log") || die "Failed to open file ::$!";
my $uid = $>;
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}
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}
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foreach (@ARGV) {
$arg="$arg" . " $_";
}
open (MAIL,"|$mailprog $arg") || die "cannot open $mailprog: $!";
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}
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close (MAIL);
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Here's my situation:
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Do you subscribe to newsletters or web host magazines?
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waht i do ?
Code:
root@server [~]# service exim restart
Shutting down clamd: [ OK ]
Shutting down exim: [ OK ]
Shutting down antirelayd: [FAILED]
Shutting down spamd: [ OK ]
Starting clamd: [ OK ]
Starting exim-26: [ OK ]
Starting exim: [ OK ]
Starting exim-smtps: [ OK ]
Starting antirelayd: Cannot find the maillog at /usr/sbin/antirelayd line 26.
[FAILED]
Starting spamd: [ OK ]
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