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List: apache-httpd-users
Subject: Re: [users@httpd] Re: Apache web server devouring resources
From: Darryl Philip Baker <darryl.baker () northwestern ! edu>
Date: 2019-03-28 18:43:51
Message-ID: A4DBBFE8-A279-4568-BC2B-709F8EF562E7 () northwestern ! edu
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Thank you for your response but if this was an ongoing issue, I would have more \
places to look and tools available. After rebooting the system, it just went back to \
normal. The network team reviewed the load balancer and firewall logs. I have \
reviewed the Apache log and system messages. We are reviewing activity using the \
Splunk logs for the network elements but still no gun smoking or not.
Darryl Baker (he/him/his)
Sr. System Administrator
Distributed Application Platform Services
Northwestern University
1800 Sherman Ave.
Suite 6-600 – Box #39
Evanston, IL 60201-3715
darryl.baker@northwestern.edu<mailto:darryl.baker@northwestern.edu>
(847) 467-6674
From: "Muggeridge, Matt" <matt.muggeridge2@hpe.com>
Reply-To: "users@httpd.apache.org" <users@httpd.apache.org>
Date: Thursday, March 28, 2019 at 1:36 PM
To: "users@httpd.apache.org" <users@httpd.apache.org>
Subject: RE: [users@httpd] Re: Apache web server devouring resources
You will need to do some more triaging. Suggestions for things to investigate more \
deeply: http Log files, system log files, system performance monitoring, connection \
statistics, source of traffic, TCP performance tuning, firewall control, protection \
against DOS attacks… and that's just off the top.
You will need to profile the system using a myriad of tools that suit your need (e.g. \
tcpdump, lsof, top, netstat, ss, and a large variety of others, depending on what you \
learn along the way).
Matt.
From: Rose, John B <jbrose@utk.edu>
Sent: Friday, 29 March 2019 3:56 AM
To: users@httpd.apache.org
Subject: Re: [users@httpd] Re: Apache web server devouring resources
I don't think the TCP buffer would be clear if there was a continuing flow of http \
requests during that time, whether the web server software was down, or maxed out
But maybe I am wrong.
________________________________
From: Darryl Philip Baker \
<darryl.baker@northwestern.edu<mailto:darryl.baker@northwestern.edu>>
Sent: Thursday, March 28, 2019 1:22:59 PM
To: users@httpd.apache.org<mailto:users@httpd.apache.org>
Subject: Re: [users@httpd] Re: Apache web server devouring resources
No PHP on the system at all. The web server was down for 15-20 minutes so anything in \
the queue should have cleared, right?
Darryl Baker (he/him/his)
Sr. System Administrator
Distributed Application Platform Services
Northwestern University
1800 Sherman Ave.
Suite 6-600 – Box #39
Evanston, IL 60201-3715
darryl.baker@northwestern.edu<mailto:darryl.baker@northwestern.edu>
(847) 467-6674
From: "Rose, John B" <jbrose@utk.edu<mailto:jbrose@utk.edu>>
Reply-To: "users@httpd.apache.org<mailto:users@httpd.apache.org>" \
<users@httpd.apache.org<mailto:users@httpd.apache.org>>
Date: Thursday, March 28, 2019 at 11:32 AM
To: "users@httpd.apache.org<mailto:users@httpd.apache.org>" \
<users@httpd.apache.org<mailto:users@httpd.apache.org>>
Subject: [users@httpd] Re: Apache web server devouring resources
Regarding the "load increasing quickly after restarting the daemons" ...
I do not believe just restarting the daemons clears the TCP queue. Nor does it \
prevent new TCP requests. If it is an attack, then the load would ramp back up \
immediately. That is why you have to reboot I am guessing.
Do you utilize PHP? PHP-FPM? Do you use TCP or Unix Domain sockets?
Are there a preponderance of http connections or PHP-FPM processes, or both?
If PHP-FPM do you use "static" "dynamic" or "ondemand"?
________________________________
From: Darryl Philip Baker \
<darryl.baker@northwestern.edu<mailto:darryl.baker@northwestern.edu>>
Sent: Thursday, March 28, 2019 12:11:27 PM
To: users@httpd.apache.org<mailto:users@httpd.apache.org>
Subject: [users@httpd] Apache web server devouring resources
Gentlefolk,
I had an incident yesterday where the Apache web server host had a load average of \
over 170 and was performing very slowly. Stopping the web server did fix the issue \
but when I restarted the daemons the load started to increase very quickly. I ended \
up having to reboot the system to fix the issue. I don't like that one bit, this is a \
Linux system not a Windows server. (Editorial remark: I have found that systems need \
reboots to fix stuff much more frequently since the adoption of systemd) I have been \
asked to do a root cause analysis, but I have not found anything as of yet. I am \
reaching out for help in this matter.
The system is a RHEL7 ESX VM with the Red Hat's main line distribution of Apache 2.4 \
as opposed to the RHSCL version. The configuration is quite complex and a bit \
sensitive so I cannot share all of that. What I'm looking for is technics to look at \
what happened rather than being given the answer anyway.
Darryl Baker (he/him/his)
Sr. System Administrator
Distributed Application Platform Services
Northwestern University
1800 Sherman Ave.
Suite 6-600 – Box #39
Evanston, IL 60201-3715
darryl.baker@northwestern.edu<mailto:darryl.baker@northwestern.edu>
(847) 467-6674
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<p class="MsoNormal">Thank you for your response but if this was an ongoing issue, I \
would have more places to look and tools available. After rebooting the system, it \
just went back to normal. The network team reviewed the load balancer and firewall \
logs. I have reviewed the Apache log and system messages. We are reviewing activity \
using the Splunk logs for the network elements but still no gun smoking or \
not.<o:p></o:p></p> <p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal"><b><span \
style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">Darryl \
Baker </span></b><span style="color:black"> (he/him/his)</span><o:p></o:p></p>
<p class="MsoNormal"><span \
style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">Sr. \
System Administrator</span><span \
style="font-size:12.0pt;color:black"><o:p></o:p></span></p> <p \
class="MsoNormal"><span \
style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">Distributed \
Application Platform Services</span><span \
style="font-size:12.0pt;color:black"><o:p></o:p></span></p> <p \
class="MsoNormal"><b><span \
style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#4E2A84">Northwestern \
University</span></b><span \
style="font-size:12.0pt;color:black"><o:p></o:p></span></p> <p \
class="MsoNormal"><span \
style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">1800 \
Sherman Ave.</span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p> \
<p class="MsoNormal"><span \
style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">Suite \
6-600 – Box #39</span><span \
style="font-size:12.0pt;color:black"><o:p></o:p></span></p> <p \
class="MsoNormal"><span \
style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">Evanston, \
IL 60201-3715</span><span \
style="font-size:12.0pt;color:black"><o:p></o:p></span></p> <p \
class="MsoNormal"><u><span \
style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><a \
href="mailto:darryl.baker@northwestern.edu">darryl.baker@northwestern.edu</a></span></u><span \
style="font-size:12.0pt;color:black"><o:p></o:p></span></p> <p \
class="MsoNormal"><span \
style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">(847) \
467-6674</span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p> \
</div> <p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: \
</span></b><span style="font-size:12.0pt;color:black">"Muggeridge, Matt" \
<matt.muggeridge2@hpe.com><br> <b>Reply-To: \
</b>"users@httpd.apache.org" <users@httpd.apache.org><br> <b>Date: \
</b>Thursday, March 28, 2019 at 1:36 PM<br> <b>To: \
</b>"users@httpd.apache.org" <users@httpd.apache.org><br> <b>Subject: \
</b>RE: [users@httpd] Re: Apache web server devouring resources<o:p></o:p></span></p> \
</div> <div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<p class="MsoNormal"><span lang="EN-GB">You will need to do some more triaging. \
Suggestions for things to investigate more deeply: http Log files, system log \
files, system performance monitoring, connection statistics, source of traffic, TCP \
performance tuning, firewall control, protection against DOS attacks… and that's \
just off the top.</span><o:p></o:p></p> <p class="MsoNormal"><span \
lang="EN-GB"> </span><o:p></o:p></p> <p class="MsoNormal"><span lang="EN-GB">You \
will need to profile the system using a myriad of tools that suit your need (e.g. \
tcpdump, lsof, top, netstat, ss, and a large variety of others, depending on what you \
learn along the way).</span><o:p></o:p></p> <p class="MsoNormal"><span \
lang="EN-GB"> </span><o:p></o:p></p> <p class="MsoNormal"><span \
lang="EN-GB">Matt.</span><o:p></o:p></p> <p class="MsoNormal"><span \
lang="EN-GB"> </span><o:p></o:p></p> <div style="border:none;border-left:solid \
blue 1.5pt;padding:0in 0in 0in 4.0pt"> <div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> Rose, John B <jbrose@utk.edu> <br>
<b>Sent:</b> Friday, 29 March 2019 3:56 AM<br>
<b>To:</b> users@httpd.apache.org<br>
<b>Subject:</b> Re: [users@httpd] Re: Apache web server devouring \
resources<o:p></o:p></p> </div>
</div>
<p class="MsoNormal"> <o:p></o:p></p>
<div id="divtagdefaultwrapper">
<p><span style="font-size:12.0pt;color:black">I don't think the TCP buffer would be \
clear if there was a continuing flow of http requests during that time, whether the \
web server software was down, or maxed out</span><o:p></o:p></p> <p><span \
style="font-size:12.0pt;color:black"> </span><o:p></o:p></p> <p><span \
style="font-size:12.0pt;color:black">But maybe I am \
wrong. </span><o:p></o:p></p> <p><span \
style="font-size:12.0pt;color:black"> </span><o:p></o:p></p> <p><span \
style="font-size:12.0pt;color:black"> </span><o:p></o:p></p> </div>
<div class="MsoNormal" align="center" style="text-align:center">
<hr size="0" width="100%" align="center">
</div>
<div id="divRplyFwdMsg">
<p class="MsoNormal"><b><span style="color:black">From:</span></b><span \
style="color:black"> Darryl Philip Baker <<a \
href="mailto:darryl.baker@northwestern.edu">darryl.baker@northwestern.edu</a>><br> \
<b>Sent:</b> Thursday, March 28, 2019 1:22:59 PM<br> <b>To:</b> <a \
href="mailto:users@httpd.apache.org">users@httpd.apache.org</a><br> <b>Subject:</b> \
Re: [users@httpd] Re: Apache web server devouring resources</span> <o:p></o:p></p>
<div>
<p class="MsoNormal"> <o:p></o:p></p>
</div>
</div>
<div>
<div>
<p class="xmsonormal">No PHP on the system at all. The web server was down for 15-20 \
minutes so anything in the queue should have cleared, right?<o:p></o:p></p> <p \
class="xmsonormal"> <o:p></o:p></p> <div>
<p class="xmsonormal"><b><span \
style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">Darryl \
Baker </span></b><span style="color:black"> (he/him/his)</span><o:p></o:p></p>
<p class="xmsonormal"><span \
style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">Sr. \
System Administrator</span><o:p></o:p></p> <p class="xmsonormal"><span \
style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">Distributed \
Application Platform Services</span><o:p></o:p></p> <p class="xmsonormal"><b><span \
style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#4E2A84">Northwestern \
University</span></b><o:p></o:p></p> <p class="xmsonormal"><span \
style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">1800 \
Sherman Ave.</span><o:p></o:p></p> <p class="xmsonormal"><span \
style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">Suite \
6-600 – Box #39</span><o:p></o:p></p> <p class="xmsonormal"><span \
style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">Evanston, \
IL 60201-3715</span><o:p></o:p></p> <p class="xmsonormal"><u><span \
style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><a \
href="mailto:darryl.baker@northwestern.edu">darryl.baker@northwestern.edu</a></span></u><o:p></o:p></p>
<p class="xmsonormal"><span \
style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">(847) \
467-6674</span><o:p></o:p></p> </div>
<p class="xmsonormal"> <o:p></o:p></p>
<p class="xmsonormal"> <o:p></o:p></p>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="xmsonormal"><b><span style="font-size:12.0pt;color:black">From: </span>
</b><span style="font-size:12.0pt;color:black">"Rose, John B" <<a \
href="mailto:jbrose@utk.edu">jbrose@utk.edu</a>><br> <b>Reply-To: </b>"<a \
href="mailto:users@httpd.apache.org">users@httpd.apache.org</a>" <<a \
href="mailto:users@httpd.apache.org">users@httpd.apache.org</a>><br> <b>Date: \
</b>Thursday, March 28, 2019 at 11:32 AM<br> <b>To: </b>"<a \
href="mailto:users@httpd.apache.org">users@httpd.apache.org</a>" <<a \
href="mailto:users@httpd.apache.org">users@httpd.apache.org</a>><br> <b>Subject: \
</b>[users@httpd] Re: Apache web server devouring resources</span><o:p></o:p></p> \
</div> <div>
<p class="xmsonormal"> <o:p></o:p></p>
</div>
<div id="x_divtagdefaultwrapper">
<p><span style="font-size:12.0pt;color:black">Regarding the "load increasing \
quickly after restarting the daemons" ...</span><o:p></o:p></p> <p><span \
style="font-size:12.0pt;color:black"> </span><o:p></o:p></p> <p \
style="margin-bottom:12.0pt"><span style="font-size:12.0pt;color:black">I do not \
believe just restarting the daemons clears the TCP queue. Nor does it prevent \
new TCP requests. If it is an attack, then the load would ramp back up immediately. \
That is why you have to reboot I am guessing.</span><o:p></o:p></p>
<p><span style="font-size:12.0pt;color:black">Do you utilize PHP? PHP-FPM? Do \
you use TCP or Unix Domain sockets?</span><o:p></o:p></p> <p><span \
style="font-size:12.0pt;color:black"> </span><o:p></o:p></p> <p><span \
style="font-size:12.0pt;color:black">Are there a preponderance of http connections or \
PHP-FPM processes, or both?</span><o:p></o:p></p> <p><span \
style="font-size:12.0pt;color:black"> </span><o:p></o:p></p> <p><span \
style="font-size:12.0pt;color:black">If PHP-FPM do you use "static" \
"dynamic" or "ondemand"?</span><o:p></o:p></p> </div>
<div class="MsoNormal" align="center" style="text-align:center">
<hr size="0" width="100%" align="center">
</div>
<div id="x_divRplyFwdMsg">
<p class="xmsonormal"><b><span style="color:black">From:</span></b><span \
style="color:black"> Darryl Philip Baker <<a \
href="mailto:darryl.baker@northwestern.edu">darryl.baker@northwestern.edu</a>><br> \
<b>Sent:</b> Thursday, March 28, 2019 12:11:27 PM<br> <b>To:</b> <a \
href="mailto:users@httpd.apache.org">users@httpd.apache.org</a><br> <b>Subject:</b> \
[users@httpd] Apache web server devouring resources</span> <o:p></o:p></p> <div>
<p class="xmsonormal"> <o:p></o:p></p>
</div>
</div>
<div>
<div>
<p class="xxmsonormal"><span \
style="font-size:11.0pt">Gentlefolk,</span><o:p></o:p></p> <p class="xxmsonormal" \
style="margin-left:.5in"><span style="font-size:11.0pt">I had an incident yesterday \
where the Apache web server host had a load average of over 170 and was performing \
very slowly. Stopping the web server did fix the issue but when I restarted the \
daemons the load started to increase very quickly. I ended up having to reboot the \
system to fix the issue. I don't like that one bit, this is a Linux system not a \
Windows server. (Editorial remark: I have found that systems need reboots to fix \
stuff much more frequently since the adoption of systemd) I have been asked to do a \
root cause analysis, but I have not found anything as of yet. I am reaching out for \
help in this matter.</span><o:p></o:p></p> <p class="xxmsonormal" \
style="margin-left:.5in"><span style="font-size:11.0pt"> </span><o:p></o:p></p> \
<p class="xxmsonormal" style="margin-left:.5in"><span style="font-size:11.0pt">The \
system is a RHEL7 ESX VM with the Red Hat's main line distribution of Apache 2.4 as \
opposed to the RHSCL version. The configuration is quite complex and a bit sensitive \
so I cannot share all of that. What I'm looking for is technics to look at what \
happened rather than being given the answer anyway.</span><o:p></o:p></p> <p \
class="xxmsonormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p> <p \
class="xxmsonormal"><b><span \
style="font-family:"Arial",sans-serif;color:black">Darryl Baker \
</span></b><span style="font-size:11.0pt;color:black"> (he/him/his)</span><o:p></o:p></p>
<p class="xxmsonormal"><span \
style="font-family:"Arial",sans-serif;color:black">Sr. System \
Administrator</span><o:p></o:p></p> <p class="xxmsonormal"><span \
style="font-family:"Arial",sans-serif;color:black">Distributed Application \
Platform Services</span><o:p></o:p></p> <p class="xxmsonormal"><b><span \
style="font-family:"Arial",sans-serif;color:#4E2A84">Northwestern \
University</span></b><o:p></o:p></p> <p class="xxmsonormal"><span \
style="font-family:"Arial",sans-serif;color:black">1800 Sherman \
Ave.</span><o:p></o:p></p> <p class="xxmsonormal"><span \
style="font-family:"Arial",sans-serif;color:black">Suite 6-600 – Box \
#39</span><o:p></o:p></p> <p class="xxmsonormal"><span \
style="font-family:"Arial",sans-serif;color:black">Evanston, IL \
60201-3715</span><o:p></o:p></p> <p class="xxmsonormal"><u><span \
style="font-family:"Arial",sans-serif;color:black"><a \
href="mailto:darryl.baker@northwestern.edu">darryl.baker@northwestern.edu</a></span></u><o:p></o:p></p>
<p class="xxmsonormal"><span \
style="font-family:"Arial",sans-serif;color:black">(847) \
467-6674</span><o:p></o:p></p> <p class="xxmsonormal"> <o:p></o:p></p>
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