Load Balance Plug-in VS Reserve Proxy Plug-in

Hi,
We are trying to setup the connectivity between sun java system web server 7.0 to glass fish 2.1.
Which technology of Load Balance Plug-in VS Reserve Proxy Plug-in is better? What is the advantage one over another? Thanks!

It may be helpful to note the lineage of the SAFs:
The GF LoadBalancer SAF is the eldest
The Web Server Reverse Proxy SAF is the next version and is derived from the GF LoadBalancer
The Reverse Proxy feature of WS7 is the third version and is derived from the Web Server Reverse Proxy SAF
The source for the Reverse Proxy SAF in WS7 is visible in the moribund Open Web Server source drop.

Similar Messages

Reverse Proxy plug in and Load Balancer Plug in

Hi,
Can anyone please provide me with an example obj.conf file showing how to combine the reverse proxy plug-in and Load Balancer plug-in.
I would like to use the reverse proxy plug in to detect when static content is requested and provide this from the web server. Requests for dynamic content would then be forwarded to an Application server via the Load balancer plug-in. I have found plenty of documentation on how to configure these plug-in separately but nothing on how to combine the two.

smiking
reverse proxy plugin - its job is to forward the requests to another server for a specific task. you can use the webserver 7 . it does forward and limited load balancing (using round robin ) based on the number of servers you provide in the configuration. i would say this is a poor man's setup.
load balancer plugin - some app servers like sun java system app server or web logic provide this plugin so that you can effectively use the back end app server
with both these setup, you can <if> constructs to determine which requests need to be forwarded to the back end server.
I wonder, why do you need both - if both of them is designed to do the same thing.

How to use the Load Balancer Plug-in to serve multiple domains

In SJSAS8.1 SE/EE the asadmin commands that create and maintain a load balancer configuration operate within a domain. When the load balancer configuration is exported an xml file is created that contains all the information for that domain. To make the load balancer plug-in balance the load for multiple domains, the loadbalancer.xml files can be manually merged to conatin the data that is exported from each domain's load balancer configuration.
For example, 2 domains are created, both having a load balancing configuration. After exporting both configurations using the asadmin export-http-lb-config command, the user would then cut and past the cluster information into the single loadbalancer.xml file that resides under the web server's config directory.
An example of the manually merged loadbalancer.xml file follows:
<?xml version="1.0" encoding="UTF-8"?>
<loadbalancer>
<cluster name="domain1">
<instance disable-timeout-in-minutes="30" enabled="true" listeners="http://localhost:1026 https://localhost:38181" name="i1"/>
<instance disable-timeout-in-minutes="30" enabled="true" listeners="http://localhost:1027 https://localhost:38182" name="i2"/>
<web-module context-root="ab" disable-timeout-in-minutes="30" enabled="true"/>
<health-checker interval-in-seconds="5" timeout-in-seconds="60" url="/"/>
</cluster>
<cluster name="domain2">
<instance disable-timeout-in-minutes="30" enabled="true" listeners="http://localhost:1029 https://localhost:38189" name="i3"/>
<instance disable-timeout-in-minutes="30" enabled="true" listeners="http://localhost:1030 https://localhost:38188" name="i4"/>
<web-module context-root="webservice" disable-timeout-in-minutes="30" enabled="true"/>
<health-checker interval-in-seconds="5" timeout-in-seconds="60" url="/"/>
</cluster>
<property name="response-timeout-in-seconds" value="60"/>
<property name="reload-poll-interval-in-seconds" value="5"/>
<property name="https-routing" value="false"/>
<property name="require-monitor-data" value="false"/>
<property name="route-cookie-enabled" value="true"/>
</loadbalancer>
Hope this helps - Mark

Mark, be my savior, I work for SUN as subcontractor at client site. the only one at site ...so I depend on this forum for solutions........
still having trouble failingover to second instance. I have two AccessManagers behind this loadbalancer.
Here is what I saw......
**************LOGS**********************
[20/Jun/2005:14:22:47] failure (15102): for host 128.114.65.13 trying to GET /amconsole/base/AMA
dminFrame, service-passthrough reports: timed out waiting for request body
[20/Jun/2005:14:22:47] warning (15102): reports: lb.runtime: ROUT1014: Non-idempotent request /
amconsole/base/AMAdminFrame cannot be retried.
So I went and updated the loadbalancer.xml (see at the end of the msg). Now I get a different kind of problem...
**************LOGS******************************
[20/Jun/2005:15:25:18] failure (15295): for host 128.114.65.13 trying to GET /amconsole/base/AMA
dminFrame, service-passthrough reports: timed out waiting for request body
[20/Jun/2005:15:25:18] info (15295): reports: lb.runtime: RNTM3003 : Error servicing the request : NoVal
Here is my loadbalancer.xml file...
<loadbalancer>
<cluster name="cluster1">
<instance name="instance1" enabled="true" disable-timeout-in-minutes="1" listeners="http://idm-test-1.ucsc.
edu:80 "/>
<instance name="instance2" enabled="true" disable-timeout-in-minutes="1" listeners="http://idm-test-2.ucsc.
edu:80 "/>
<web-module context-root="amconsole" disable-timeout-in-minutes="1" enabled="true" error-url="sun-http-lber
ror.html" >
<idempotent-url-pattern url-pattern="/*" no-of-retries="3" />
</web-module>
<web-module context-root="amserver" disable-timeout-in-minutes="1" enabled="true" error-url="sun-http-lberr
or.html" >
<idempotent-url-pattern url-pattern="/*" no-of-retries="3" />
</web-module>
<web-module context-root="ampassword" disable-timeout-in-minutes="1" enabled="true" error-url="sun-http-lb
error.html" />
<web-module context-root="amcommon" disable-timeout-in-minutes="1" enabled="true" error-url="sun-http-lberr
or.html" >
<idempotent-url-pattern url-pattern="/*" no-of-retries="3" />
</web-module>
<health-checker url="/" interval-in-seconds="15" timeout-in-seconds="2" />
</cluster>
<property name="reload-poll-interval-in-seconds" value="60"/>
<property name="response-timeout-in-seconds" value="30"/>
<property name="https-routing" value="false"/>
<property name="require-monitor-data" value="true"/>
<property name="active-healthcheck-enabled" value="true"/>
<property name="number-healthcheck-retries" value="3"/>
<property name="route-cookie-enabled" value="true" />
</loadbalancer>
**************************************************************

Internal load balancer for ADFS, Web Application Proxy join problem

Hello,
we deployed 2 x ADFS (2012 R2) behind a internal Azure load balancer.
In front are two WAP servers, which should be joined to the ADFS farm based on the internal load balancer IP.
Unfortunately the WAPs fail to join and sometimes after 5 tries it works. The problem is (based on the event logs) that the ADFS Servers dont trust the WAP certificate.
It seems, that during the join process the ADFS internal load balancer does not stick to one ADFS server. If we join the WAP directly (without the ILB) to one of the ADFS servers, everything works fine.
As soon as we try to join via the ADFS internal load balancer IP, the abover occurs.
Did anyone experience the same problems? How does the internal load balancer distribute the requests? Seems to be not sticky at all.
Thanks for any Feedback,
Thomas

Thomas -
This article talks (in detail) about a recently updated distribution mode - Source IP affinity.
http://azure.microsoft.com/blog/2014/10/30/azure-load-balancer-new-distribution-mode/
Hope this helps!
/Arvind

Load balancer vs. proxy plug-in

          Using WebLogic 6.1 SP2, the proxy plug-in handles the logic of connecting to
          the secondary server (stored in a cookie) if the primary is down. How does
          this work if you use a hardware load balancer in place of the proxy
          plug-ins?


More info at http://edocs.bea.com/wls/docs61/cluster/alteon.html#591902 and
          http://edocs.bea.com/wls/docs61/cluster/bigip.html#591902.
          Kumar Allamraju wrote:
          > Hi:
          >
          > yeah this was a problem in 5.1
          > We relaxed this restriction in 6.x release. This is the main reason WLS
          > clustering will now
          > work with hardware load balancers.
          >
          > Starting from 6.x, any server can become a primary server when failover
          > happens.
          > For e.g. if S1 and S2 are primary & secondary servers for client1 and when
          > the HW LD detects
          > that the primary is down, it will route the request to any of the servers
          > (can be S3, S4, S5) in the cluster
          > and that server(e.g. S3) will become the primary server for this
          > request(i.e. client1) and get this client's session data
          > from S2. At this point S3 become primary and S3 will nominate another server
          > (e.g. S4) as a secondary server
          > (based on the replication groups, if any)
          > We will only do this for active clients. For e.g if client2 doesn't make a
          > request when S1 is down, we don't try to
          > get it's data and chose a new secondary for him. This is called lazy
          > initialization/replication.
          >
          > Hope it helps.
          >
          > --
          > Kumar
          > "Joe" <[email protected]> wrote in message news:[email protected]...
          > >
          > > Using WebLogic 6.1 SP2, the proxy plug-in handles the logic of connecting
          > to
          > > the secondary server (stored in a cookie) if the primary is down. How
          > does
          > > this work if you use a hardware load balancer in place of the proxy
          > > plug-ins?
          > >
          > >
          > >
          > >
          Rajesh Mirchandani
          Developer Relations Engineer
          BEA Support

Using ACE for proxy server load balancing

Hello groups,
I wanted to know your experiences of using ACE for proxy server load balancing.
I want to load balance to a pool of proxy servers. Note: load-balancing should be based on the HTTP URL (i can't use source or dest. ip address) so that
a certain domain always gets "cached/forwarded" to the same proxy server. I don't really want to put matching
criteria in the configuration (such as /a* to S1, /b* to S2, /c* to S3,etc..), but have this hash calculated automatically.
Can the ACE compute its own hash based on the number of "online" proxy servers ? ie. when 4 servers are online, distribute domains between 1,2,3,4 evenly.
Should server 4 fail, recalculate hash so that the load of S4 gets distributed across the other 3 evenly. Also load-balancing domains of S1 ,S2 and S3 should not change if S4 fails.....
regards,
Geert

This is done with the following predictor command:
Scimitar1/Admin# conf t
Enter configuration commands, one per line. End with CNTL/Z.
Scimitar1/Admin(config)# serverfarm Proxy
Scimitar1/Admin(config-sfarm-host)# predictor hash ?
address         Configure 'hash address' Predictor algorithms
content         Configure 'hash http content' Predictor algorithms
cookie          Configure 'hash cookie' Predictor algorithms
header          Configure 'hash header' Predictor algorithm
layer4-payload Configure 'hash layer4-payload' Predictor algorithms
url             Configure 'hash url' Predictor algorithm
Scimitar1/Admin(config-sfarm-host)# predictor hash url
It does hash the url and the result takes into account the number of active proxies dynamically.
This command has been designed for this kind of scenario that you describe.
Gilles.

Reverse proxy server on top of load balancer

Hi ,
I have seen some customers with setup including Reverse Proxy Server on top of Load balancer with SSL accelerator configured with oracle apps 11i , my query is what is the use of configuring Reverse proxy server on top of Load balancer as load balancer can act as reverse proxy.
Thanks,
Puneeth

Hi;
Pelase see Steven Chan blog entery
In-Depth: Load-Balancing E-Business Suite Environments
http://blogs.oracle.com/stevenChan/2006/06/indepth_loadbalancing_ebusines.html
Also see:
11i Forms LoadBalancing question
Load Balancing for EBS R12
Check notes, i belive those are should gives u some answer
Regard
Helios

Load balancing with JSP

Anyone and everyone,
When configuring load balancing with Weblogic clusters, does load
balancing take effect for all services or just EJB and RMI? Or another
way of saying the same thing, can I setup weighted load balancing for
the JSP engines across 2 weblogic servers.
Thanks in advance,
Mike

The load-balancing documentation you read describing the different algorithms only applies to RMI stubs (e.g., EJB clients). Please see http://www.weblogic.com/docs51/cluster/concepts.html#1026091 for a description of how load-balancing/clustering works with servlets/JSPs.
The short answer is that in using servlet clustering, most people want/need/use in-memory replication for HttpSession objects. In WLS 5.1 (and before), in-memory replication requires one or more proxy servers be set-up in front of the cluster. Typically, most people use something like BigIP to load-balance
across the proxy servers and let the weblogic plug-in for the proxy server handle the routing to the cluster. The plug-in uses round-robin until an HttpSession is established for a user, then it always tries to route to the server where the user's session is located.
Hope this helps,
Robert
Brian Lin wrote:
All,
I have a quesiton here regarding load balancing with DNS round robin. As of Chapter Adminstration of Clustering Weblogic server, Weblogic can be configured to balance by weight. How about Weblogic handle weight based balancing after DNS round robin ip response? or just can choose one way instead of both?
What's the big difference between choosing BigIP and software balancing (WL)?
Brian
"Wei Guan" <[email protected]> wrote:
I don't think you can configure this load balancing in weblogic in current
release. However, if you have Big-IP or LocalDireoctr, you can set up
weighted load-balancing there. Otherwise, weblogic proxy will use DNS round
robin to do the load-balancing between JSP engins.
My 2 cents.
Cheers - Wei
Michael Yakimisky <[email protected]> wrote in message
news:[email protected]...
Anyone and everyone,
When configuring load balancing with Weblogic clusters, does load
balancing take effect for all services or just EJB and RMI? Or another
way of saying the same thing, can I setup weighted load balancing for
the JSP engines across 2 weblogic servers.
Thanks in advance,
Mike

Load Balancing of 2-Tiered vs 3-Tiered Clustering

Hi,
          I was looking at the cluster diagrams on the clustering page:
          http://www.weblogic.com/docs60/cluster/index.html
          And I can't help notice a slight descrepency between the diagram of a 2-Tier
          cluster (WL web cluster + WL app cluster) vs.a 3-Tier cluster (web
          proxy-plugin + WL web cluster + WL app cluster).
          In the 2-Tier diagram, the arrows going from the web nodes to the app nodes
          converges to a single point, indicating that there's load balancing of
          servlet calls to ejbs.
          In the 3-Tier diagram, the arrows from each web node point directly to an
          app node, which seems to indicate that there is a static one-to-one
          relationship, hence no load-balancing. Below the 3-Tier diagram, one of the
          described limitations of using standalone web server and proxy plug-ins is:
          a.. Limited Load Balancing Options: When you use proxy plug-ins or the
          HttpClusterServlet to access clustered servlets, the load balancing
          algorithm is limited to a simple round-robin strategy.
          I believe this is describe load balancing between the fire-wall and the
          proxy web servers. But what about the load balancing between the WL web
          servers and the app servers? Does it exist, or does one web server always
          assigned to one app server?
          Gene Chuang
          Join Kiko.com!


Currently, we only support clusters within the same subnet, as most routers
          can't handle multicast traffic. We are considering designs to relax this
          restriction in a future release.
          -Don
          Cameron Purdy wrote:
          > > 3) In WLAS6.0, you can specify how to pick the secondary server. Most
          > > important of all, pick a secondary server which is on the different
          > physical
          > > box than primary.
          >
          > ... and if you are using two different physical networks, make sure it is on
          > the other physical network. Any hints on how to do that?
          >
          > --
          > Cameron Purdy
          > Tangosol, Inc.
          > http://www.tangosol.com
          > +1.617.623.5782
          > WebLogic Consulting Available
          >
          > "Wei Guan" <[email protected]> wrote in message
          > news:[email protected]...
          > > Here is my understanding:
          > > 1) Proxy will route new sessions based on round-robins. Old sessions will
          > > route to the primary server.
          > > 2) Primary server will pick the secondary server.
          > > 3) In WLAS6.0, you can specify how to pick the secondary server. Most
          > > important of all, pick a secondary server which is on the different
          > physical
          > > box than primary.
          > >
          > >
          > > --
          > > Hope it helps.
          > >
          > > Cheers - Wei
          > >
          > >
          > > "Cameron Purdy" <[email protected]> wrote in message
          > > news:[email protected]...
          > > > Is it true that the proxy can only use round-robin to load-balance the
          > WL
          > > > cluster? I understand that, once selected for a session, the proxy will
          > > > always route requests to the primary server specified in the cookie or
          > URL
          > > > (or secondary), but in the case that no primary or secondary has been
          > > > assigned, can the proxy pick a destination server (which I assume
          > becomes
          > > > the primary) using an algorithm such as "random" (which is theoretically
          > > > superior to round-robin over time)? Also, who picks the secondary
          > server?
          > > > Is it the primary or the proxy?
          > > >
          > > > --
          > > > Cameron Purdy
          > > > Tangosol, Inc.
          > > > http://www.tangosol.com
          > > > +1.617.623.5782
          > > > WebLogic Consulting Available
          > > >
          > > >
          > > > "Don Ferguson" <[email protected]> wrote in message
          > > > news:[email protected]...
          > > > > Hi, comments in line.
          > > > >
          > > > > Gene Chuang wrote:
          > > > > >
          > > > > > Hi,
          > > > > >
          > > > > > I was looking at the cluster diagrams on the clustering page:
          > > > > >
          > > > > > http://www.weblogic.com/docs60/cluster/index.html
          > > > > >
          > > > > > And I can't help notice a slight descrepency between the diagram of
          > a
          > > > 2-Tier
          > > > > > cluster (WL web cluster + WL app cluster) vs.a 3-Tier cluster (web
          > > > > > proxy-plugin + WL web cluster + WL app cluster).
          > > > > >
          > > > > > In the 2-Tier diagram, the arrows going from the web nodes to the
          > app
          > > > nodes
          > > > > > converges to a single point, indicating that there's load balancing
          > of
          > > > > > servlet calls to ejbs.
          > > > > >
          > > > > > In the 3-Tier diagram, the arrows from each web node point directly
          > to
          > > > an
          > > > > > app node, which seems to indicate that there is a static one-to-one
          > > > > > relationship, hence no load-balancing.
          > > > >
          > > > > This is just an artifact of the drawing, not of the architecture. The
          > > > same
          > > > > load balancing would be performed between the web and app tiers
          > > regardless
          > > > > of whether or not there is a front end web server.
          > > > >
          > > > > > Below the 3-Tier diagram, one of the
          > > > > > described limitations of using standalone web server and proxy
          > > plug-ins
          > > > is:
          > > > > >
          > > > > > a.. Limited Load Balancing Options: When you use proxy plug-ins or
          > the
          > > > > > HttpClusterServlet to access clustered servlets, the load balancing
          > > > > > algorithm is limited to a simple round-robin strategy.
          > > > > >
          > > > > > I believe this is describe load balancing between the fire-wall and
          > > the
          > > > > > proxy web servers. But what about the load balancing between the WL
          > > web
          > > > > > servers and the app servers? Does it exist, or does one web server
          > > > always
          > > > > > assigned to one app server?
          > > > >
          > > > > This is not describing the load balancing between the firewall and the
          > > > > proxy web servers; we do not control of how that is performed. It is
          > > > > describing the load balancing between the proxy servers and the web
          > > tier.
          > > > > The diagram should really show that more clearly, as was done in the
          > > > 2-tier
          > > > > example.
          > > > >
          > > > > -Don
          > > > >
          > > > > >
          > > > > > --
          > > > > > Gene Chuang
          > > > > > Join Kiko.com!
          > > >
          > > >
          > >
          > >

Load balancing on iplanet

What are the capabilitiesof the load balancing plug-in "Resonate Command Module" for iplanet? Is this the only load balancing feature that iplanet provides.
Also, if anyone knows of other reasonable (price) load balancing solutions for iplanet web server: preferably, software based only (no load balancing hardware).
I looked at the documentation, and deduced that "resonate" alone cannot provide load balancing for iplanet web servers.
TIA,
Mo

Actually resonate is a sofware based load balancing solution. The confusion is that it doesnt come with the iplanet web server. The command module is only an interface to resonate that will tell it how to react to iplanet internals. So, you would still need to buy Resonate central dispatch for this to be any use to you. Resonate software is expensive. Expect to pay about 60k to start last I checked.
There arent that many other software load balancers that are cheap. I found one open source thing called pen. Check out http://siag.nu/pen
It's really not bad. It supports sticky lb and can actually work for any simple tcp protocol: http,https,ldap,imap,pop,etc....
The only thing is that you need to set up your own failover for pen so that if the pen process goes down another machine will service the requests.

Doubt on Hardware Load Balancing?

Hi Community,
I think there are two ways to perform the load balancing.One of them is proxy and other one is hardware load balancing.I have know something about the Proxy related Load balancing using Apache,oracle HTTP server and others.My question,I don't know about the single bit of Hardware load balancing,i refer the some sites but it is not benefits for me.So please guide me to configure the hardware load balancing for my cluster..
Regards,
Ove..

Hi,
Find the document for configuring the hardware load balancer with Weblogic
1.F5 load balancer
https://www.f5.com/pdf/deployment-guides/bea-bigip45-dg.pdf
2.Cicso
http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Data_Center/App_Networking/weblogicdg.html
http://www.cisco.com/en/US/solutions/ns340/ns517/ns431/ns432/net_design_guidance09186a0080908169.pdf
Additional Info
http://pauldone.blogspot.in/2013/04/load-balancing-t3-initial-context.html
Best Load Balancing Hardware | TechSource
Oracle Weblogic Server Administration: Load Balancing in Weblogic Server
http://www.broadband-testing.co.uk/download/ZeusBEAWebLogic.pdf
http://www.ateam-oracle.com/using-weblogic-as-a-load-balancer/
Hope it helps

TCP SYNSEEN with load balancing Cisco ACE 4710

I have a Cisco ACE 4710 load balancing the traffic to two proxy servers, the configuration is the same since December 2012, but yesterday it stated to show SYNSEEN in the show conn command, and the hosts cannot browse. I think that means that the three-way-handshake is not complete.
If I bypass the ACE the hosts can browse without problems.
I have tested with another ACE appliance and the same configuration but the behaviour is the same.
I need help as soon as possible,
thanks,
I've attached the Show conn, show conn detail and show run.

Hi Cesar,
Thank you for your answer,
The issue was solved,
We were running an A3 software version, it seems to have a Bug so it doesn't show the NAT commands in the "show run", so when we made the configuration backup we didn't noticed it.
The ACE reloaded because an electrical failure so it losted the NAT config.
We just upgraded to an A4 version and also added a NAT/PAT to enable the communication between the Clients and the Proxy.
Regards,

Load Balancing with Reverse Proxy Plug-in in SunOne 6.1

Hello
we are configuring our reverse proxy web server SunOn 6.1 for load balancing and we have some conflicting information that we have found on the internet. The options we have found are the following:
1- In one case, it seems that all we need to do is add the destination servers to the servers parameter (quoted, space-delimited). We have read that the proxy server will simply round-robin requests.
2- In another case, we have seen that we have to use an loadbalancer.xml file with the server names and reference the file from both magnus.conf and obj.conf.
I have doubts about the second option because I really think this is configuration in 7.0 not 6.1.
Also, I also need to configure session stickiness but it is not clear how this works. There is an option for sticky cookies that defaults to JSESSIONID if not configured. Does this mean that I will have session stickiness but simply without the use of cookies?
ANY HELP? We need to solve this in the next day.

HI,
This may work for you.
obj.conf
<Object name="passthrough1">
Service fn="service-passthrough" servers="http://localhost:8080"
</Object>
<Object name="default">
AuthTrans fn="match-browser" browser="MSIE" ssl-unclean-shutdown="true"
NameTrans fn="assign-name" from="/idm(|/*)" name="passthrough1"
NameTrans fn="ntrans-j2ee" name="j2ee"
NameTrans fn="pfx2dir" from="/mc-icons" dir="D:/Sun/WebServer6.1/ns-icons" name="es-internal"
NameTrans fn="document-root" root="$docroot"
PathCheck fn="nt-uri-clean"
PathCheck fn="check-acl" acl="default"
PathCheck fn="find-pathinfo"
PathCheck fn="find-index" index-names="intro.htm,index.html,home.html,index.jsp"
ObjectType fn="type-by-extension"
ObjectType fn="force-type" type="text/plain"
Service method="(GET|HEAD)" type="magnus-internal/imagemap" fn="imagemap"
Service method="(GET|HEAD)" type="magnus-internal/directory" fn="index-common"
Service method="(GET|HEAD|POST)" type="~magnus-internal/" fn="send-file"
Service method="TRACE" fn="service-trace"
Error fn="error-j2ee"
AddLog fn="flex-log" name="access"
</Object>
<Object name="j2ee">
Service fn="service-j2ee" method="*"
</Object>
<Object name="cgi">
ObjectType fn="force-type" type="magnus-internal/cgi"
Service fn="send-cgi"
</Object>
<Object name="es-internal">
PathCheck fn="check-acl" acl="es-internal"
</Object>
============================================
magnus.conf
# The NetsiteRoot, ServerName, and ServerID directives are DEPRECATED.
# They will not be supported in future releases of the Web Server.
NetsiteRoot D:/Sun/WebServer6.1
ServerName abc
ServerID https-www.abc.com
RqThrottle 128
DNS off
Security off
ExtraPath D:/Sun/WebServer6.1/bin/https/bin
Init fn=flex-init access="$accesslog" format.access="%Ses->client.ip% - %Req->vars.auth-user% [%SYSDATE%] \"%Req->reqpb.clf-request%\" %Req->srvhdrs.clf-status% %Req->srvhdrs.content-length%"
Init fn="load-modules" shlib="D:/Sun/WebServer6.1/bin/https/bin/j2eeplugin.dll" shlib_flags="(global|now)"
Init fn="load-modules" shlib="D:/Sun/WebServer6.1/plugins/passthrough/passthrough.dll"

How to make IIS plug-in do STICKY load balancing

There are two classes of scalable services: pure and sticky. A pure service
is one where any instance of the application can respond to client requests.
A sticky service is one where a client sends its requests to the same
instance; those requests are not redirected to other instances.
It seems to me that weblogic IIS proxy plug-in does not support the sticky
load balancing.
Could someone give me some information on how to make the proxy sticky?
Is there configuration parameters for this?
Thanks,
-Lei

I set the cluster.
It seems to me that there is some problem with the Set-Cookie mechanism of
the plug-in.
Sometime it set the cookie in my browser, sometime it is not.
Even from the wlproxy.log, I could set something like
Fri Aug 03 17:56:12 2001 Hdrs to
client:[Set-Cookie]=[AribaNode=O2tII92qHlP2tpZjUV0m5ued1s6X028cUPu24QcGj1Q25
AE5VXOd!1782877802312707887!ltang.ariba.com!8001!7002; domain=ariba.com;
path=/]
But the cookie is not set in my browser, what might be wrong here?
Thanks,
-Lei
"Eric Gross" <[email protected]> wrote in message
news:[email protected]...
I do believe that this will not work since if clustering is not enabled, a
cookie will not be set on the browser that contains the primary and
secondary server.
You are specifying two different ports in your servers. You need to use
clustering in order to get this functionality with the plugin.Furthermore,
you will achieve fail-over.
Regards,
Eric
"Lei Tang" <[email protected]> wrote in message
news:[email protected]...
Here is what I did for the examples under the bea sample directory.
I put the following in test1/WEB-INF/weblogic.xml
<session-descriptor>
<session-param>
<param-name> CookieDomain </param-name>
<param-value> *.ariba.com </param-value>
</session-param>
<session-param>
<param-name> CookieName </param-name>
<param-value> AribaNode </param-value>
</session-param>
<session-param>
<param-name> CookiePath </param-name>
<param-value> /test1 </param-value>
</session-param>
</session-descriptor>
</weblogic-web-app>
I add the following in iisproxy.ini
# This file contains initialization name/value pairs
# for the IIS/WebLogic plug-in.
WebLogicCluster=ltang.ariba.com:8001,achu.ariba.com:7001
ConnectTimeoutSecs=20
ConnectRetrySecs=2
Debug=ALL
WLLogFile=c:\tmp\wlproxy.log
WlForwardPath=/test1
DynamicServerList=OFF
CookieName=AribaNode
I use SesssionServlet.java as an example
When I involk http://proxy/test1/SessionServlet, I always get 1
if I use
http://proxy/test1/SessionServlet:AribaNode=................................
I could see the session becomes sticky.
If I do not want to use URL rewriting, what should I do in order to makethe
session STICKY
for this example.
Thanks,
-Lei
"Eric Gross" <[email protected]> wrote in message
news:[email protected]...
If you leave the CookieName untouched on the WebLogic side, then there
should be no reason to make the change in the plug-in.
But yes, you need to make sure the cookie names are the same.
Regards,
Eric
"Mark Vaughn" <[email protected]> wrote in message
news:[email protected]...
Actually, you also need to make sure you set the "CookieName" in theplugin.
That let's the plugin read the cookie set by WebLogic to determine
who
the
primary and secondary servers are for that session. Otherwise, theplugin
has no
way of knowing if you are establishing a new session or returning to
an
existing
one. The cookie will tell it if you have a current session and who
it
should
send you to for continuing that session, or failing that session
over.
>>>>
Eric Gross wrote:
Without having clustering enabled, you will not get Sticky load
balancing.
You need to have clustering so that a cookie is sent back to the
client
that
contains information about where it's session is located.
Otherwise,
you
are just going to get round-robin each time.
You can refer to the following page for more information:
http://e-docs.beasys.com/wls/docs61/cluster/servlet.html
Regards,
Eric
"Lei Tang" <[email protected]> wrote in message
news:[email protected]...
WebLogicCluster=machine1:7001,machine2:7001
ConnectTimeoutSecs=20
ConnectRetrySecs=2
Debug=ALL
WLLogFile=c:\tmp\wlproxy.log
WlForwardPath=/test,/test1
DynamicServerList=OFF
I run two standone (Admin server) weblogic servers on machine1
machine2.
Then I deploy application test.war on machine1 first, then onmachine2.
Should I make machine2 as a managed server and machine1 as an
admi
n
server?
Will this make the session sticky?
Thanks,
-Lei
"Eric Gross" <[email protected]> wrote in message
news:[email protected]...
It would help us to know how you have iisproxy.ini configured.
Sticky
load
balancing should work fine if you have the plug-in and
WebLogic
Server
setup
correctly.
How have you setup the plug-in?
Thanks,
Eric
"Lei Tang" <[email protected]> wrote in message
news:[email protected]...
There are two classes of scalable services: pure and sticky.
A
pure
service
is one where any instance of the application can respond to
client
requests.
A sticky service is one where a client sends its requests to
the
same
instance; those requests are not redirected to other
instances.
It seems to me that weblogic IIS proxy plug-in does notsupport
the
sticky
load balancing.
Could someone give me some information on how to make the
proxy
sticky?
Is there configuration parameters for this?
Thanks,
-Lei
.-. Mark Vaughn
/V\ 7024 Corona Dr.
// \\ North Richland Hills, TX 76180
/( )\ [email protected]
^^-^^
"Give a man a fish and you feed him for a day;
teach him to use the Net and he won't bother you for weeks."
Ben Woodbridge

Apache plug-in won't load balance requests evenly on cluster

I can't seem to get the Apache plug-in to actually do round-robin load balancing
of HTTP
requests. It does random-robin, as I like to call it, since the plug-in will usually
hit all the
servers in the cluster but in a random fashion.
I've got three managed servers:
192.168.1.5:8001 (WL6 on Linux) 192.168.1.2:8001 (WL6 on Linux) 192.168.1.7:8001
(WL6 on Linux)
Admin server on 192.168.1.7:7000 (WL6 on W2k)
My Apache server is 1.3.9 (RedHat SSL) on 192.168.1.52.
The log file for each servers has something like this:
####<Apr 19, 2001 1:18:54 AM MDT> <Info> <Cluster> <neptune> <cluster1server1>
<main> <system> <> <000102> <Joined cluster cluster1 at address 225.0.0.5 on port
8001>
####<Apr 19, 2001 1:19:31 AM MDT> <Info> <Cluster> <neptune> <cluster1server1>
<ExecuteThread: '9' for queue: 'default'> <> <> <000127> <Adding
3773576126129840579S:192.168.1.2:[8001,8001,7002,7002,8001,7002,-1]:192.168.1.52
to the cluster> ####<Apr 19, 2001 1:19:31 AM MDT> <Info> <Cluster> <neptune>
<cluster1server1> <ExecuteThread: '11' for queue: 'default'> <> <> <000127> <Adding
-6393447100509727955S:192.168.1.5:[8001,8001,7002,7002,8001,7002,-1]:192.168.1.52
to the cluster>
So I believe I have correctly created a cluster, although I did not bother to
assign
replication groups for HTTP session replication (yet).
The Apache debug output indicates it knows about all three servers and I can see
it
doing the "random-robin" load balancing. Here is the output:
Thu Apr 19 00:20:53 2001 Initializing lastIndex=2 for a list of length=3 Thu Apr
19
00:20:53 2001 Init Srvr# [1] = [192.168.1.2:8001] load=1077584792 isGood=1077590272
numSk ip=134940256 Thu Apr 19 00:20:53 2001 Init Srvr# [2] = [192.168.1.5:8001]
load=1077584792 isGood=1077590272 numSk ip=134940256 Thu Apr 19 00:20:53 2001
Init Srvr# [3] = [192.168.1.7:8001] load=1077584792 isGood=1077590272 numSk
ip=134940256 Thu Apr 19 00:20:53 2001 INFO: SSL is not configured Thu Apr 19
00:20:53 2001 Now trying whatever is on the list; ci->canUseSrvrList = 1 Thu Apr
19
00:20:53 2001 INFO: New NON-SSL URL Thu Apr 19 00:20:53 2001 general list: trying
connect to '192.168.1.7'/8001 Thu Apr 19 00:20:53 2001 Connected to 192.168.1.7:8001
Thu Apr 19 00:20:53 2001 INFO: sysSend 320 Thu Apr 19 00:20:53 2001 INFO:
Reader::fill(): first=0 last=0 toRead=4096 Thu Apr 19 00:21:06 2001 parsed all
headers
OK Thu Apr 19 00:21:06 2001 Initializing lastIndex=1 for a list of length=3 Thu
Apr 19
00:21:06 2001 ###Response### : Srvr# [1] = [192.168.1.5:8001] load=1077584792
isGood=1077 546628 numSkip=1077546628 Thu Apr 19 00:21:06 2001 ###Response###
: Srvr# [2] = [192.168.1.2:8001] load=1077584792 isGood=1077 546628
numSkip=1077546628 Thu Apr 19 00:21:06 2001 ###Response### : Srvr# [3] =
[192.168.1.7:8001] load=1077584792 isGood=1077 546628 numSkip=1077546628 Thu Apr
19 00:21:06 2001 INFO: Reader::fill(): first=0 last=0 toRead=4096
Basically, the lastIndex=XXX appears to be random. It may do round-robin for 4
or 5
connections but then always it resorts to randomly directing new connections.
This is what the configuration looks like using the plug-in's
/weblogic?__WebLogicBridgeConfig URL:
Weblogic Apache Bridge Configuration parameters:
WebLogic Cluster List:
1.Host: '192.168.1.2' Port: 8001 Primary
General Server List:
1.Host: '192.168.1.2' Port: 8001
2.Host: '192.168.1.5' Port: 8001
3.Host: '192.168.1.7' Port: 8001
DefaultFileName: ''
PathTrim: '/weblogic'
PathPrepend: '' ConnectTimeoutSecs:
'10' ConnectRetrySecs: '2'
HungServerRecoverSecs: '300'
MaxPostSize: '0'
StatPath: false
CookieName: JSESSIONID
Idempotent:
ON FileCaching:
ON ErrorPage: ''
DisableCookie2Server: OFF
Can someone please help to shed some light on this? I would be really grateful,
thanks!
Jeff

Right - it means that the only configuration which can do perfect round-robin is a
single plugin (non-Apache, or single-process Apache) - all others essentially do random
(sort of, but it can skew test results during first N requests).
Robert Patrick <[email protected]> wrote:
Dimitri,
The way Apache works is that is spawns a bunch of child processes and the parent process
that listens on the port delegates the processing of each request to one of the child
processes. This means that the load-balancing dome by the plugin before the session ID is
assigned does not do perfect round-robining because there are multiple copies of the plugin
loaded in the multiple child processes. This situation is similar to the one you would get
by running multiple proxy servers on different machines with the NES/iPlanet and IIS
plugins.
As I pointed out in my response to Jeff, attempting to address this problem with IPC
machanisms would only solve the single machine problem and most people deploy multiple
proxy servers to avoid a single point of failure...
Hope this helps,
Robert
Dimitri Rakitine wrote:
Hrm. This is strange - I thought that all the information nesessary for a
'sticky' load-balancing (primary/secondary) is contained in the cookie/session info,
so, the particular plug-in implementation should not make any difference. For
load-balancing - statistically, given large enough sampling base, Apache plug-in
should perform just a well as NS one (unless apache is somehow misconfigured and
calls fork() for each new request).
Jeff Calog <[email protected]> wrote:
Robert,
Thanks for the sanity reply, you are definitely right. I used Netscape 3.0 on
Win2k and it did perfect round-robin load balancing to my servers.
<raving>
BEA - ARE YOU LISTENING? STOP TELLING PEOPLE YOUR APACHE PLUG-IN IS A VIABLE
LOAD BALANCING SOLUTION! It's worthless for load balancing!
</raving>
In some tests, as many as 90% of my connections/requests would be sent to a single
server. There should be something in the release notes like "By the way, the
Apache plug-in is only advertised as doing round-robin load balancing, in reality
it doesn't work worth a darn".
I'm surprised they don't used shared memory or some other technique (pipes, sockets,
signals, writing to /tmp, anything) for interprocess communication to fix that.
Jeff
Robert Patrick <[email protected]> wrote:
Yes, the problem lies in the fact that Apache uses multiple processes
instead of
multiple threads to process requests. Therefore, you end up with multiple
processes all
with the WebLogic plugin loaded into them (and they cannot see one another)...
Hopefully, Apache 2.0 when it comes out will allow the plugin to do a
better job...
Jeff Calog wrote:
I can't seem to get the Apache plug-in to actually do round-robin loadbalancing
of HTTP
requests. It does random-robin, as I like to call it, since the plug-inwill usually
hit all the
servers in the cluster but in a random fashion.
I've got three managed servers:
192.168.1.5:8001 (WL6 on Linux) 192.168.1.2:8001 (WL6 on Linux) 192.168.1.7:8001
(WL6 on Linux)
Admin server on 192.168.1.7:7000 (WL6 on W2k)
My Apache server is 1.3.9 (RedHat SSL) on 192.168.1.52.
The log file for each servers has something like this:
####<Apr 19, 2001 1:18:54 AM MDT> <Info> <Cluster> <neptune> <cluster1server1>
<main> <system> <> <000102> <Joined cluster cluster1 at address 225.0.0.5on port
8001>
####<Apr 19, 2001 1:19:31 AM MDT> <Info> <Cluster> <neptune> <cluster1server1>
<ExecuteThread: '9' for queue: 'default'> <> <> <000127> <Adding
3773576126129840579S:192.168.1.2:[8001,8001,7002,7002,8001,7002,-1]:192.168.1.52
to the cluster> ####<Apr 19, 2001 1:19:31 AM MDT> <Info> <Cluster><neptune>
<cluster1server1> <ExecuteThread: '11' for queue: 'default'> <> <><000127> <Adding
-6393447100509727955S:192.168.1.5:[8001,8001,7002,7002,8001,7002,-1]:192.168.1.52
to the cluster>
So I believe I have correctly created a cluster, although I did notbother to
assign
replication groups for HTTP session replication (yet).
The Apache debug output indicates it knows about all three serversand I can see
it
doing the "random-robin" load balancing. Here is the output:
Thu Apr 19 00:20:53 2001 Initializing lastIndex=2 for a list of length=3Thu Apr
19
00:20:53 2001 Init Srvr# [1] = [192.168.1.2:8001] load=1077584792 isGood=1077590272
numSk ip=134940256 Thu Apr 19 00:20:53 2001 Init Srvr# [2] = [192.168.1.5:8001]
load=1077584792 isGood=1077590272 numSk ip=134940256 Thu Apr 19 00:20:532001
Init Srvr# [3] = [192.168.1.7:8001] load=1077584792 isGood=1077590272numSk
ip=134940256 Thu Apr 19 00:20:53 2001 INFO: SSL is not configured ThuApr 19
00:20:53 2001 Now trying whatever is on the list; ci->canUseSrvrList= 1 Thu Apr
19
00:20:53 2001 INFO: New NON-SSL URL Thu Apr 19 00:20:53 2001 generallist: trying
connect to '192.168.1.7'/8001 Thu Apr 19 00:20:53 2001 Connected to192.168.1.7:8001
Thu Apr 19 00:20:53 2001 INFO: sysSend 320 Thu Apr 19 00:20:53 2001INFO:
Reader::fill(): first=0 last=0 toRead=4096 Thu Apr 19 00:21:06 2001parsed all
headers
OK Thu Apr 19 00:21:06 2001 Initializing lastIndex=1 for a list oflength=3 Thu
Apr 19
00:21:06 2001 ###Response### : Srvr# [1] = [192.168.1.5:8001] load=1077584792
isGood=1077 546628 numSkip=1077546628 Thu Apr 19 00:21:06 2001 ###Response###
: Srvr# [2] = [192.168.1.2:8001] load=1077584792 isGood=1077 546628
numSkip=1077546628 Thu Apr 19 00:21:06 2001 ###Response### : Srvr#[3] =
[192.168.1.7:8001] load=1077584792 isGood=1077 546628 numSkip=1077546628Thu Apr
19 00:21:06 2001 INFO: Reader::fill(): first=0 last=0 toRead=4096
Basically, the lastIndex=XXX appears to be random. It may do round-robinfor 4
or 5
connections but then always it resorts to randomly directing new connections.
This is what the configuration looks like using the plug-in's
/weblogic?__WebLogicBridgeConfig URL:
Weblogic Apache Bridge Configuration parameters:
WebLogic Cluster List:
1.Host: '192.168.1.2' Port: 8001 Primary
General Server List:
1.Host: '192.168.1.2' Port: 8001
2.Host: '192.168.1.5' Port: 8001
3.Host: '192.168.1.7' Port: 8001
DefaultFileName: ''
PathTrim: '/weblogic'
PathPrepend: '' ConnectTimeoutSecs:
'10' ConnectRetrySecs: '2'
HungServerRecoverSecs: '300'
MaxPostSize: '0'
StatPath: false
CookieName: JSESSIONID
Idempotent:
ON FileCaching:
ON ErrorPage: ''
DisableCookie2Server: OFF
Can someone please help to shed some light on this? I would be reallygrateful,
thanks!
Jeff
Dimitri--
Dimitri

Load Balance Plug-in VS Reserve Proxy Plug-in

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