Apache Server status page shows uneven number of requests across load

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Hello All,



We have apache servers running on RedHat Linux physical servers, all 4
servers are balanced by Citrix Netscaler 8.1 load balancer with round robin
weight load sharing algorithm.



However when I check the server status page to find the number of requests
are served by each Apache server is showing uneven load / number of requests
being processed by each Apache.



I notice the load always getting processed by two specific Apache instances,
here are the configuration details.



Attached here the server status screen shot page of all 4 web servers.



[root@web bin]# ./apachectl -version

Server version: Apache/2.2.6 (Unix)

Server built: Sep 26 2007 11:18:50

[root@web bin]#



Operating System:



Linux Host1 2.4.21-53.ELsmp #1 SMP Wed Nov 14 03:54:12 EST 2007 i686 i686
i386 GNU/Linux





Hardware configuration are same for all 4 physical Linux servers.



Please advice.



Best Regards,

Arun J

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eta name=3D"ProgId" content=3D"Word.Document"> ent=3D"Microsoft Word 11"> rd 11"> l1%5C01%5Cclip_filelist.xml">

Hello All,

=A0

We have apache servers running on RedHat Linux physi=
cal
servers, all 4 servers are balanced by Citrix Netscaler 8.1 load balancer w=
ith
round robin weight load sharing algorithm.

=A0

However when I check the server status page to find =
the
number of requests are served by each Apache server is showing uneven load =
/
number of requests being processed by each Apache.

=A0

I notice the load always getting processed by two sp=
ecific
Apache instances, here are the configuration details.

=A0

Attached here the server status screen shot page of =
all 4
web servers.

=A0

[root@web bin]# ./apachectl -version

Server version: Apache/2.2.6 (Unix)

Server built:   Sep 26
2007 11:18:50

[root@web bin]#

=A0

Operating System:

=A0

Linux Host1 2.4.21-53.ELsmp #1 SMP Wed Nov 14 03:54:=
12 EST
2007 i686 i686 i386 GNU/Linux

=A0

=A0

Hardware configuration are same for all 4 physical L=
inux
servers.

=A0

Please advice.

=A0

Best Regards,

Arun J

Re: Apache Server status page shows uneven number ofrequests across load balanced web servers

On 01/27/2010 08:06 PM, Arunkumar Janarthanan wrote:
> Hello All,
>
> We have apache servers running on RedHat Linux physical servers, all 4
> servers are balanced by Citrix Netscaler 8.1 load balancer with round
> robin weight load sharing algorithm.
>
> However when I check the server status page to find the number of
> requests are served by each Apache server is showing uneven load /
> number of requests being processed by each Apache.
>
> I notice the load always getting processed by two specific Apache
> instances, here are the configuration details.
>
> Attached here the server status screen shot page of all 4 web servers.
>
> [root@web bin]# ./apachectl -version
>
> Server version: Apache/2.2.6 (Unix)
>
> Server built: Sep 26 2007 11:18:50
>
> [root@web bin]#
>
> Operating System:
>
> Linux Host1 2.4.21-53.ELsmp #1 SMP Wed Nov 14 03:54:12 EST 2007 i686
> i686 i386 GNU/Linux
>
> Hardware configuration are same for all 4 physical Linux servers.
>
> Please advice.
>
> Best Regards,
>
> Arun J
>
>
>
>
> ------------------------------------------------------------ ---------
> The official User-To-User support forum of the Apache HTTP Server Project.
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> To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
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> For additional commands, e-mail: users-help@httpd.apache.org

You're at the wrong place my friend. This is not a Citrix Netscaler
Support list. Check with them. Its rare you'll get any help here.

--
Nilesh Govindarajan
Site & Server Adminstrator
www.itech7.com

------------------------------------------------------------ ---------
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See for more info.
To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
" from the digest: users-digest-unsubscribe@httpd.apache.org
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Re: Apache Server status page shows uneven number of

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Hi Nilesh,

Thanks for your response.

I have already checked this with Load balancer support found the requests
are getting sitributed eventually from Netscaler end.

So was chekcing if this could be an issue or known behaviour with Apache.

Best Regards,
Arun J

On Wed, Jan 27, 2010 at 9:43 AM, Nilesh Govindarajan wrote:

> On 01/27/2010 08:06 PM, Arunkumar Janarthanan wrote:
>
>> Hello All,
>>
>> We have apache servers running on RedHat Linux physical servers, all 4
>> servers are balanced by Citrix Netscaler 8.1 load balancer with round
>> robin weight load sharing algorithm.
>>
>> However when I check the server status page to find the number of
>> requests are served by each Apache server is showing uneven load /
>> number of requests being processed by each Apache.
>>
>> I notice the load always getting processed by two specific Apache
>> instances, here are the configuration details.
>>
>> Attached here the server status screen shot page of all 4 web servers.
>>
>> [root@web bin]# ./apachectl -version
>>
>> Server version: Apache/2.2.6 (Unix)
>>
>> Server built: Sep 26 2007 11:18:50
>>
>> [root@web bin]#
>>
>> Operating System:
>>
>> Linux Host1 2.4.21-53.ELsmp #1 SMP Wed Nov 14 03:54:12 EST 2007 i686
>> i686 i386 GNU/Linux
>>
>> Hardware configuration are same for all 4 physical Linux servers.
>>
>> Please advice.
>>
>> Best Regards,
>>
>> Arun J
>>
>>
>>
>>
>> ------------------------------------------------------------ ---------
>> The official User-To-User support forum of the Apache HTTP Server Project.
>> See for more info.
>> To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
>> " from the digest: users-digest-unsubscribe@httpd.apache.org
>> For additional commands, e-mail: users-help@httpd.apache.org
>>
>
> You're at the wrong place my friend. This is not a Citrix Netscaler Support
> list. Check with them. Its rare you'll get any help here.
>
> --
> Nilesh Govindarajan
> Site & Server Adminstrator
> www.itech7.com
>
> ------------------------------------------------------------ ---------
> The official User-To-User support forum of the Apache HTTP Server Project.
> See for more info.
> To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
> " from the digest: users-digest-unsubscribe@httpd.apache.org
> For additional commands, e-mail: users-help@httpd.apache.org
>
>

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Hi Nilesh,

Thanks for your response.

I have already checked t=
his with Load balancer support found the requests are getting sitributed ev=
entually from Netscaler end.

So was chekcing if this could be an iss=
ue or known behaviour with Apache.


Best Regards,
Arun J

Re: Apache Server status page shows uneven number of requests across load balanced web servers

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On Wed, 2010-01-27 at 09:47 -0500, Arunkumar Janarthanan wrote:
> Hi Nilesh,
>=20
> Thanks for your response.
>=20
> I have already checked this with Load balancer support found the
> requests are getting sitributed eventually from Netscaler end.
>=20
> So was chekcing if this could be an issue or known behaviour with
> Apache.

If the load-balancer is doing true Round Robin, then 1/N requests will
be sent to each server.
If you are not seeing that, then the load-balancer isn't sending the
requests in the first place.

For example, I have an Apache 2.x proxy/balancer here
and /balancer-status is telling me that exactly 1/2 of my requests are
going to each of my 2 back-end servers.


If you could paste some actual numbers, that would help.

Mark.

--=20
Mark Watts BSc RHCE MBCS
Senior Systems Engineer, Managed Services Manpower
www.QinetiQ.com
QinetiQ - Delivering customer-focused solutions
GPG Key: http://www.linux-corner.info/mwatts.gpg

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RE: Apache Server status page shows uneven number ofrequests across load balanced web servers

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Arunkumar,

There is no problem with what I see. The load balancer will balance a requ=
ester to a machine for a period of time. So if my web clients makes a requ=
est to your server, I will probably have a higher probability of getting th=
at same server. It's like iptables connection tracking. Load balance does=
n't necessarily mean equality service. There is also an unfair comparison =
going on here. The servers that are seeing all of the connections were res=
tarted 1.5 days ago and the two that are working fine were started 6 days a=
go. If you are going to restart and then compare, restart all of them to c=
ompare. You mentioned that you are using weight load sharing algorithm. I=
t is possible that when the two servers were restarted that the balancer is=
trying to give them a bigger weighted share to "catch up" to the other ser=
vers. I had a problem with this using ipvsadm some time ago when I would a=
dd a new server and give it the same schedule as the others it would be sla=
mmed for a while.

When you see a lot of connections like that, do an netstat -atunep and see =
what the IP address and states are. Check to see if you have a bunch of du=
plicate IP's. If this is the case, it's because the load balancer is gluin=
g the connections during a session and that the IP's are also making multip=
le requests.

That's a place to start at least.

Gary Smith

From: Arunkumar Janarthanan [mailto:arunkumar.webadmin@gmail.com]
Sent: Wednesday, January 27, 2010 6:36 AM
To: users@httpd.apache.org
Subject: [users@httpd] Apache Server status page shows uneven number of req=
uests across load balanced web servers

Hello All,

We have apache servers running on RedHat Linux physical servers, all 4 serv=
ers are balanced by Citrix Netscaler 8.1 load balancer with round robin wei=
ght load sharing algorithm.

However when I check the server status page to find the number of requests =
are served by each Apache server is showing uneven load / number of request=
s being processed by each Apache.

I notice the load always getting processed by two specific Apache instances=
, here are the configuration details.

Attached here the server status screen shot page of all 4 web servers.

[root@web bin]# ./apachectl -version
Server version: Apache/2.2.6 (Unix)
Server built: Sep 26 2007 11:18:50
[root@web bin]#

Operating System:

Linux Host1 2.4.21-53.ELsmp #1 SMP Wed Nov 14 03:54:12 EST 2007 i686 i686 i=
386 GNU/Linux


Hardware configuration are same for all 4 physical Linux servers.

Please advice.

Best Regards,
Arun J

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Re: Apache Server status page shows uneven number of

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Thanks Gary,

The load balancing method we use is weight based, so apparently the load
balancer suppose to send the traffic to the web server has least number of
connections. However the Netscaler support confirmed they see eventual
number of traffic routed to all 4 web servers.

Regarding the Apache restart time, I restarted all 4 servers same time and
checked could still see the requests on 1 & 3 are being handled. I dont
think we have sticky session enabled at loadbalancer level.

For the same problem we have not before changed the load balancer settings
from sourceIP persistence to Weight based to have the load distributed equa=
l
on all the servers.

IP port Type State Req/s

731-...30_80 x.x.x.x 80 HTTP UP 16/s

731-...31_80 x.x.x.x 80 HTTP UP 16/s

731-...31_80 x.x.x.x 80 HTTP UP 14/s

731-...55_80 x.x.x.x 80 HTTP UP 20/s



Rsp/s Reqb/s Rspb/s ClntConn SvrConn MaxConn SurgeQ

731-...30_80 16/s 12406/s 345117/s 7 285 0 0

731-...31_80 16/s 10956/s 365025/s 7 262 0 0

731-...31_80 14/s 11140/s 368655/s 6 268 0 0

731-...55_80 20/s 14322/s 420105/s 7 272 0 0




However the Apache server status still shows the number of requests being
handled huge difference.


I have attached the balancer-manager page as well with this email.


Best Regards,

Arun J



On Wed, Jan 27, 2010 at 12:25 PM, Gary Smith wrot=
e:

> Arunkumar,
>
>
>
> There is no problem with what I see. The load balancer will balance a
> requester to a machine for a period of time. So if my web clients makes =
a
> request to your server, I will probably have a higher probability of gett=
ing
> that same server. It=92s like iptables connection tracking. Load balanc=
e
> doesn=92t necessarily mean equality service. There is also an unfair
> comparison going on here. The servers that are seeing all of the
> connections were restarted 1.5 days ago and the two that are working fine
> were started 6 days ago. If you are going to restart and then compare,
> restart all of them to compare. You mentioned that you are using weight
> load sharing algorithm. It is possible that when the two servers were
> restarted that the balancer is trying to give them a bigger weighted shar=
e
> to =93catch up=94 to the other servers. I had a problem with this using =
ipvsadm
> some time ago when I would add a new server and give it the same schedule=
as
> the others it would be slammed for a while.
>
>
>
> When you see a lot of connections like that, do an netstat -atunep and se=
e
> what the IP address and states are. Check to see if you have a bunch of
> duplicate IP=92s. If this is the case, it=92s because the load balancer =
is
> gluing the connections during a session and that the IP=92s are also maki=
ng
> multiple requests.
>
>
>
> That=92s a place to start at least.
>
>
>
> Gary Smith
>
>
>
> *From:* Arunkumar Janarthanan [mailto:arunkumar.webadmin@gmail.com]
> *Sent:* Wednesday, January 27, 2010 6:36 AM
> *To:* users@httpd.apache.org
> *Subject:* [users@httpd] Apache Server status page shows uneven number of
> requests across load balanced web servers
>
>
>
> Hello All,
>
>
>
> We have apache servers running on RedHat Linux physical servers, all 4
> servers are balanced by Citrix Netscaler 8.1 load balancer with round rob=
in
> weight load sharing algorithm.
>
>
>
> However when I check the server status page to find the number of request=
s
> are served by each Apache server is showing uneven load / number of reque=
sts
> being processed by each Apache.
>
>
>
> I notice the load always getting processed by two specific Apache
> instances, here are the configuration details.
>
>
>
> Attached here the server status screen shot page of all 4 web servers.
>
>
>
> [root@web bin]# ./apachectl -version
>
> Server version: Apache/2.2.6 (Unix)
>
> Server built: Sep 26 2007 11:18:50
>
> [root@web bin]#
>
>
>
> Operating System:
>
>
>
> Linux Host1 2.4.21-53.ELsmp #1 SMP Wed Nov 14 03:54:12 EST 2007 i686 i686
> i386 GNU/Linux
>
>
>
>
>
> Hardware configuration are same for all 4 physical Linux servers.
>
>
>
> Please advice.
>
>
>
> Best Regards,
>
> Arun J
>

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Thanks Gar=
y,

mily: tahoma,sans-serif;">T=
he load balancing method we use is weight based, so apparently the load bal=
ancer suppose to send the traffic to the web server has least number of con=
nections. However the Netscaler support confirmed they see eventual number =
of traffic routed to all 4 web servers.
homa,sans-serif;">

ahoma,sans-serif;">Regarding the Apache restart time, I restarted all 4 ser=
vers same time and checked could still see the requests on 1 & 3 are be=
ing handled.=A0 I dont think we have sticky session enabled at loadbalancer=
level.


ahoma,sans-serif;">For the same problem we have not before changed the load=
balancer settings from sourceIP persistence to Weight based to have the lo=
ad distributed equal on all the servers.
homa,sans-serif;">

ntent-Type" content=3D"text/html; charset=3Dutf-8"> ntent=3D"Word.Document"> 11"> font-family: tahoma,sans-serif;" rel=3D"File-List" href=3D"file:///C:%5CWIN=
DOWS%5CTEMP%5Cmsohtml1%5C01%5Cclip_filelist.xml">

=3D"2">          =
              =A0 IP     <=
/span>port         Type    =A0=
   State  =A0
Req/s

=3D"2">731-...30_80=A0 x.x.x.x pan>  
80         HTTP      =
     UP     16/s

=3D"2">731-...31_80=A0 x.x.x.x pan>  
80         HTTP      =
     UP     16/s

=3D"2">731-...31_80=A0 x.x.x.x pan>  
80         HTTP      =
     UP     14/s

=3D"2">731-...55_80=A0 x.x.x.x pan>  
80         HTTP      =
     UP     20/s

=3D"2">=A0

=3D"2">          =
     Rsp/s   Reqb/s  
Rspb/s ClntConn=A0 SvrConn=A0 MaxConn >  
SurgeQ

=3D"2">731-...30_80  =A0 16/=
s=A0
12406/s 345117/s      =A0 7  =A0=
   285      =A0
0      =A0 0

=3D"2">731-...31_80  =A0 16/=
s=A0
10956/s 365025/s      =A0 7  =A0=
   262      =A0
0      =A0 0

=3D"2">731-...31_80  =A0 14/=
s=A0
11140/s 368655/s      =A0 6  =A0=
   268      =A0
0      =A0 0

=3D"2">731-...55_80  =A0 20/=
s=A0
14322/s 420105/s      =A0 7  =A0=
   272      =A0
0      =A0 0

=3D"2">

"MsoNormal">=A0

=3D"2">However the Apache server status still shows the number of requests =
being handled huge difference.

ma,sans-serif;" class=3D"MsoNormal">

" class=3D"MsoNormal">I have attached the balancer-manager=
page as well with this email.

a,sans-serif;" class=3D"MsoNormal">

" class=3D"MsoNormal">Best Regards,

MsoNormal"> >Arun J

RE: Apache Server status page shows uneven number of requests across load balanced web servers

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Arun,

This is just a WAG, but I think that the problem still lies in the client s=
ide and how the load balancer is handling the requests. I would still be i=
nterested in seeing the netstat -atunep output from one of he affected mac=
hines when there is a high level of connections in a closed state. Even th=
ough the sessions aren't sticky, is it possible that the load balancer is h=
andling keep alive in such a way that it's sending the back to the original=
server but on in a new state? (that's a little beyond my knowledge though=
).

Gary Smith

From: Arunkumar Janarthanan [mailto:arunkumar.webadmin@gmail.com]
Sent: Wednesday, January 27, 2010 11:37 AM
To: users@httpd.apache.org
Subject: Re: [users@httpd] Apache Server status page shows uneven number of=
requests across load balanced web servers

Thanks Gary,

The load balancing method we use is weight based, so apparently the load ba=
lancer suppose to send the traffic to the web server has least number of co=
nnections. However the Netscaler support confirmed they see eventual number=
of traffic routed to all 4 web servers.

Regarding the Apache restart time, I restarted all 4 servers same time and =
checked could still see the requests on 1 & 3 are being handled. I dont th=
ink we have sticky session enabled at loadbalancer level.

For the same problem we have not before changed the load balancer settings =
from sourceIP persistence to Weight based to have the load distributed equa=
l on all the servers.
IP port Type State Req/s
731-...30_80 x.x.x.x 80 HTTP UP 16/s
731-...31_80 x.x.x.x 80 HTTP UP 16/s
731-...31_80 x.x.x.x 80 HTTP UP 14/s
731-...55_80 x.x.x.x 80 HTTP UP 20/s

Rsp/s Reqb/s Rspb/s ClntConn SvrConn MaxConn SurgeQ
731-...30_80 16/s 12406/s 345117/s 7 285 0 0
731-...31_80 16/s 10956/s 365025/s 7 262 0 0
731-...31_80 14/s 11140/s 368655/s 6 268 0 0
731-...55_80 20/s 14322/s 420105/s 7 272 0 0


However the Apache server status still shows the number of requests being h=
andled huge difference.

I have attached the balancer-manager page as well with this email.

Best Regards,
Arun J



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/schemas.microsoft.com/sharepoint/soap/workflow/" xmlns:dsss=3D"http://sche=
mas.microsoft.com/office/2006/digsig-setup" xmlns:dssi=3D"http://schemas.mi=
crosoft.com/office/2006/digsig" xmlns:mdssi=3D"http://schemas.openxmlformat=
s.org/package/2006/digital-signature" xmlns:mver=3D"http://schemas.openxmlf=
ormats.org/markup-compatibility/2006" xmlns:m=3D"http://schemas.microsoft.c=
om/office/2004/12/omml" xmlns:mrels=3D"http://schemas.openxmlformats.org/pa=
ckage/2006/relationships" xmlns:spwp=3D"http://microsoft.com/sharepoint/web=
partpages" xmlns:ex12t=3D"http://schemas.microsoft.com/exchange/service s/20=
06/types" xmlns:ex12m=3D"http://schemas.microsoft.com/exchange/service s/200=
6/messages" xmlns:pptsl=3D"http://schemas.microsoft.com/sharepoint/soap/ Sli=
deLibrary/" xmlns:spsl=3D"http://microsoft.com/webservices/SharePointPor tal=
Server/PublishedLinksService" xmlns:Z=3D"urn:schemas-microsoft-com:" xmlns:=
st=3D"
" xmlns=3D"http://www.w3.org/TR/REC-html40">

Re: Apache Server status page shows uneven number of

--00151747c356bbb15e047e2b8e29
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Gary,

Here is the netstat output attached from one of the webserver where the
connections are on HIGH numbers. Regarding the load balancer I am trying to
explore more setting options.

Thanks again for looking into this issue.

Best Regards,
Arun J

On Wed, Jan 27, 2010 at 2:49 PM, Gary Smith wrote=
:

> Arun,
>
>
>
> This is just a WAG, but I think that the problem still lies in the client
> side and how the load balancer is handling the requests. I would still b=
e
> interested in seeing the netstat -atunep output from one of he affected
> machines when there is a high level of connections in a closed state. Ev=
en
> though the sessions aren=92t sticky, is it possible that the load balance=
r is
> handling keep alive in such a way that it=92s sending the back to the ori=
ginal
> server but on in a new state? (that=92s a little beyond my knowledge
> though).
>
>
>
> Gary Smith
>
>
>
> *From:* Arunkumar Janarthanan [mailto:arunkumar.webadmin@gmail.com]
> *Sent:* Wednesday, January 27, 2010 11:37 AM
>
> *To:* users@httpd.apache.org
> *Subject:* Re: [users@httpd] Apache Server status page shows uneven numbe=
r
> of requests across load balanced web servers
>
>
>
> Thanks Gary,
>
> The load balancing method we use is weight based, so apparently the load
> balancer suppose to send the traffic to the web server has least number o=
f
> connections. However the Netscaler support confirmed they see eventual
> number of traffic routed to all 4 web servers.
>
> Regarding the Apache restart time, I restarted all 4 servers same time an=
d
> checked could still see the requests on 1 & 3 are being handled. I dont
> think we have sticky session enabled at loadbalancer level.
>
> For the same problem we have not before changed the load balancer setting=
s
> from sourceIP persistence to Weight based to have the load distributed eq=
ual
> on all the servers.
>
> IP port Type State Req/s
>
> 731-...30_80 x.x.x.x 80 HTTP UP 16/s
>
> 731-...31_80 x.x.x.x 80 HTTP UP 16/s
>
> 731-...31_80 x.x.x.x 80 HTTP UP 14/s
>
> 731-...55_80 x.x.x.x 80 HTTP UP 20/s
>
>
>
> Rsp/s Reqb/s Rspb/s ClntConn SvrConn MaxConn Surge=
Q
>
> 731-...30_80 16/s 12406/s 345117/s 7 285 0 =
0
>
> 731-...31_80 16/s 10956/s 365025/s 7 262 0 =
0
>
> 731-...31_80 14/s 11140/s 368655/s 6 268 0 =
0
>
> 731-...55_80 20/s 14322/s 420105/s 7 272 0 =
0
>
>
>
>
>
> However the Apache server status still shows the number of requests being
> handled huge difference.
>
>
>
> I have attached the balancer-manager page as well with this email.
>
>
>
> Best Regards,
>
> Arun J
>
>
>
>

--00151747c356bbb156047e2b8e27
Content-Type: text/html; charset=windows-1252
Content-Transfer-Encoding: quoted-printable

Gary,

Here is the netstat output attached from one of the webserver =
where the connections are on HIGH numbers. Regarding the load balancer I am=
trying to explore more setting options.

Thanks again for looking in=
to this issue.


Best Regards,
Arun J