Weblogic Apache Plugin - Load Balancing

Hi,
I have two Apache servers each with the WLS Apache Plugin installed. These sit in front of two WL servers each having two managed servers.
Each plugin is setup with the list of servers as follows:
<IfModule mod_weblogic.c>
          WebLogicCluster Server_1:7030,Server_1:7040,Server_2:7010Server_2:7020
          Debug           OFF
          WLLogFile logs/cws_proxy.log
          WLTempDir "logs"
          DebugConfigInfo OFF
          WLProxySSL On
          KeepAliveEnabled ON
          KeepAliveSecs 15
          MatchExpression *.xhtml
          MatchExpression *.jsp
     </IfModule>
Look OK so far?
Anyway, looking at the WL access.log I can see that server 1 is only receiving requests from one Apache, and the same goes for the other access.log. So... it's not really load balancing is it?
Can anyone offer any advice or comments on my plugin configuration or why it is not load balancing properly?
Much Appreciated,

I came across this link which says ‘WebLogic Server does not always load balance an object’s method calls.” And has few more details about the load balancing strategy of weblogic.
http://download.oracle.com/docs/cd/E11035_01/wls100/cluster/load_balancing.html#wp1026599
http://download.oracle.com/docs/cd/E11035_01/wls100/cluster/load_balancing.html
This might help.

Similar Messages

Disable Apache Plugin Load Balancing

When proxying requests with the Weblogic Apache Proxy Plugin, can load balancing
be disabled? We do not want to load balance between Weblogic servers since the
Apache server is running on the same box as Weblogic. However, we still very
much want the failover capabilities. Is it possible to disable the load balancing
and preserve the failover capabilities?
Thanks in advance.
Brian Husted

"Brian Husted" <[email protected]> wrote:
>
When proxying requests with the Weblogic Apache Proxy Plugin, can load
balancing
be disabled? We do not want to load balance between Weblogic servers
since the
Apache server is running on the same box as Weblogic. However, we still
very
much want the failover capabilities. Is it possible to disable the load
balancing
and preserve the failover capabilities?
Thanks in advance.
Brian HustedHello!
I have also the same problem. Have you found out anything?
I contact the bea-suppport, but we haven't found a solution yet.
Greetings Hans

About Weblogic-Apache plugin for windows NT

Is there windows NT version of WEBLOGIC-APACHE Plugin? If so where can we get the details about the product?

Last time I checked, the NT version of Apache was still an alpha (or
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Mike Reiche wrote:
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Weblogic Apache Plugins -Put/Delete Method

Hi ,
I need to find out if the weblogic plugin Apache supports the use of http PUT and DELETE operations (instead of GET and POST) and if so I need an example plugin configuration where the clients are using the "PUT" and "DELETE" operations. And, again assuming the plugin supports PUT and DELETE, are there any known issues with there use in conjunction with the plugin.

Hi ,
Here is the details about the HTTP Put/Delete Protocol :-
Supported :-
HTTP Put and Delete Protocol is supported in Weblogic and Weblogic Apache Plugin .
In Apache also these protocols are supported .
Configuration :-
If you want to configure it older version of Apache we have to use the (WebDav) of the apache .But you don't have do anything for newer version
as this module should be there and we have to do only configuration for Apache for this module .
Configuration of WebDab is here in newer version of Apache:-
http://www.serverwatch.com/tutorials/article.php/2176771/Enabling-WebDAV-on-Apache.htm
We don't have to do anything on Weblogic and Apache Weblogic Plugin side .As by default they support these protocols.
Usage :-
I tested this in my environment by sending a Put request to Weblogic Plugin using the Tool called "Fiddler".
I sent a request to Weblogic Plugin using this tool and it works . Even i checked on the Apache plugin log files also that it works.
There is good note from apache how to use the Put/Delete function in Apache .
Please follow this link for usage for Put/Delete for Apache for uploading files to server . How this make life easy .
http://www.apacheweek.com/features/put
http://stackoverflow.com/questions/1051004/how-to-send-put-delete-http-request-in-httpurlconnection
Security Risk :-
Please keep in mind that there is security risk when we use this protocol which is clearly explain in the note when we use this in the example above.
Here is a nice article also which explains the security concerns of Put :-
https://www.golemtechnologies.com/articles/http-put-security
Tested hitting localhost/console
Edited the request header GET /console/login/LoginForm.jsp HTTP/1.1 to PUT /console/login/LoginForm.jsp HTTP/1.1
Got the following in the apache log file
================New Request: [PUT /console/ HTTP/1.1] =================
Wed May 29 19:24:35 2013 <608013698698758> INFO: SSL is not configured
Wed May 29 19:24:35 2013 <608013698698758> Using Uri /console/
Wed May 29 19:24:35 2013 <608013698698758> After trimming path: '/console/'
Wed May 29 19:24:35 2013 <608013698698758> The final request string is '/console/'
Wed May 29 19:24:35 2013 <608013698698758> SEARCHING id=[10.157.153.243:7001] from current ID=[10.157.153.243:7001]
Wed May 29 19:24:35 2013 <608013698698758> The two ids matched
Wed May 29 19:24:35 2013 <608013698698758> @@@FOUND...id=[10.157.153.243:7001], server_name=[localhost], server_port=[80]
Wed May 29 19:24:35 2013 <608013698698758> attempt #0 out of a max of 5
Wed May 29 19:24:35 2013 <608013698698758> Trying a pooled connection for '10.157.153.243/7001/7001'
Wed May 29 19:24:35 2013 <608013698698758> getPooledConn: No more connections in the pool for Host[10.157.153.243] Port[7001] SecurePort[7001]
Wed May 29 19:24:35 2013 <608013698698758> general list: trying connect to '10.157.153.243'/7001/7001 at line 2716 for '/console/'
Wed May 29 19:24:35 2013 <608013698698758> INFO: New NON-SSL URL
Wed May 29 19:24:35 2013 <608013698698758> Connect returns -1, and error no set to 10035, msg 'Unknown error'
Wed May 29 19:24:35 2013 <608013698698758> EINPROGRESS in connect() - selecting
Wed May 29 19:24:35 2013 <608013698698758> Local Port of the socket is 3175
Wed May 29 19:24:35 2013 <608013698698758> Remote Host 10.157.153.243 Remote Port 7001
Wed May 29 19:24:35 2013 <608013698698758> general list: created a new connection to '10.157.153.243'/7001 for '/console/', Local port:3175
Wed May 29 19:24:35 2013 <608013698698758> Hdrs from clnt:[Host]=[localhost]
Wed May 29 19:24:35 2013 <608013698698758> Hdrs from clnt:[Connection]=[keep-alive]
Wed May 29 19:24:35 2013 <608013698698758> Hdrs from clnt:[Accept]=[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
Wed May 29 19:24:35 2013 <608013698698758> Hdrs from clnt:[User-Agent]=[Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/27.0.1453.94 Safari/537.36]
Wed May 29 19:24:35 2013 <608013698698758> Hdrs from clnt:[Accept-Encoding]=[gzip,deflate,sdch]
Wed May 29 19:24:35 2013 <608013698698758> Hdrs from clnt:[Accept-Language]=[en-US,en;q=0.8]
Wed May 29 19:24:35 2013 <608013698698758> Hdrs from clnt:[Cookie]=[ADMINCONSOLESESSION=yQ7GRmLfKBhHdJrQ55t4X2v9y0v1NZCGj5qtfQdshz6w87nPc4nW!419247034]
Wed May 29 19:24:35 2013 <608013698698758> URL::sendHeaders(): meth='PUT' file='/console/' protocol='HTTP/1.1'
Wed May 29 19:24:35 2013 <608013698698758> Hdrs to WLS:[Host]=[localhost]
Wed May 29 19:24:35 2013 <608013698698758> Hdrs to WLS:[Accept]=[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
Wed May 29 19:24:35 2013 <608013698698758> Hdrs to WLS:[User-Agent]=[Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/27.0.1453.94 Safari/537.36]
Wed May 29 19:24:35 2013 <608013698698758> Hdrs to WLS:[Accept-Encoding]=[gzip,deflate,sdch]
Wed May 29 19:24:35 2013 <608013698698758> Hdrs to WLS:[Accept-Language]=[en-US,en;q=0.8]
Wed May 29 19:24:35 2013 <608013698698758> Hdrs to WLS:[Cookie]=[ADMINCONSOLESESSION=yQ7GRmLfKBhHdJrQ55t4X2v9y0v1NZCGj5qtfQdshz6w87nPc4nW!419247034]
Wed May 29 19:24:35 2013 <608013698698758> Hdrs to WLS:[Connection]=[Keep-Alive]
Wed May 29 19:24:35 2013 <608013698698758> Hdrs to WLS:[WL-Proxy-SSL]=[false]
Wed May 29 19:24:35 2013 <608013698698758> Hdrs to WLS:[WL-Proxy-Client-IP]=[127.0.0.1]
Wed May 29 19:24:35 2013 <608013698698758> Hdrs to WLS:[Proxy-Client-IP]=[127.0.0.1]
Wed May 29 19:24:35 2013 <608013698698758> Hdrs to WLS:[X-Forwarded-For]=[127.0.0.1]
Wed May 29 19:24:35 2013 <608013698698758> Hdrs to WLS:[X-WebLogic-KeepAliveSecs]=[30]
Wed May 29 19:24:35 2013 <608013698698758> Hdrs to WLS:[X-WebLogic-Force-JVMID]=[419247034]
Wed May 29 19:24:35 2013 <608013698698758> URL::parseHeaders: CompleteStatusLine set to [HTTP/1.1 302 Moved Temporarily]
Wed May 29 19:24:35 2013 <608013698698758> URL::parseHeaders: StatusLine set to [302 Moved Temporarily]
Wed May 29 19:24:35 2013 <608013698698758> Hdrs from WLS:[Connection]=[close]
Wed May 29 19:24:35 2013 <608013698698758> Hdrs from WLS:[Date]=[Wed, 29 May 2013 23:24:35 GMT]
Wed May 29 19:24:35 2013 <608013698698758> Hdrs from WLS:[Transfer-Encoding]=[chunked]
Wed May 29 19:24:35 2013 <608013698698758> Hdrs from WLS:[Location]=[http://localhost/console/console.portal?_nfpb=true]
Wed May 29 19:24:35 2013 <608013698698758> Hdrs from WLS:[Content-Type]=[text/html; charset=UTF-8]
Wed May 29 19:24:35 2013 <608013698698758> Hdrs from WLS:[X-WebLogic-JVMID]=[419247034]
Wed May 29 19:24:35 2013 <608013698698758> Hdrs from WLS:[X-Powered-By]=[Servlet/2.5 JSP/2.1]
Wed May 29 19:24:35 2013 <608013698698758> parsed all headers OK
Wed May 29 19:24:35 2013 <608013698698758> sendResponse() : r->status = '302'
Wed May 29 19:24:35 2013 <608013698698758> Hdrs to client (add):[Date]=[Wed, 29 May 2013 23:24:35 GMT]
Wed May 29 19:24:35 2013 <608013698698758> Hdrs to client (add):[Location]=[http://localhost/console/console.portal?_nfpb=true]
Wed May 29 19:24:35 2013 <608013698698758> Hdrs to client (add):[X-Powered-By]=[Servlet/2.5 JSP/2.1]
Wed May 29 19:24:35 2013 <608013698698758> canRecycle: conn=1 status=302 isKA=0 clen=-1 isCTE=1
Wed May 29 19:24:35 2013 <608013698698758> closeConn: URL.canRecycle() returns false, deleting URL '10.157.153.243/7001'
Wed May 29 19:24:35 2013 <608013698698758> request [console/] processed successfully..................
Regards
Sahil Soni
------------------------------------------------------------------------------------------------------------------------------

Load Factor for Weblogic Apache plugin

Hi All,
I have a performance testing environment and I am looking to distribute the traffic from the Apache server that we use for caching static content to three Weblogic servers. I haven't been able to find any options for configuring the distribution of requests across the three servers. Apache mod_proxy has a "loadfactor" configuration to weight the traffic toward a particular node. It seems that the plugin only operates using only a simple round-robin algorithm for load balancing.
I have found the Apache plugin configuration documentation and it doesn't look like there is such an option but I am wondering if I am missing something and it is supposed to be configured somewhere else.
Any information regarding this is appreciated.
Thanks,
Kevin

I came across this link which says ‘WebLogic Server does not always load balance an object’s method calls.” And has few more details about the load balancing strategy of weblogic.
http://download.oracle.com/docs/cd/E11035_01/wls100/cluster/load_balancing.html#wp1026599
http://download.oracle.com/docs/cd/E11035_01/wls100/cluster/load_balancing.html
This might help.

Is it possible to use Apache with load-balancer ?

Hello,
I'd like to know if it's possible to set up a load-balancing solution made of: Apache Web Server + Hardware Load Balancer+ Cluster of Weblogic Nodes.
In the documents I see Apache server is used only with the HTTP Proxy plugin. But I'd like to use the hardware load balancer to ditribute load to Weblogic nodes.
Is it possible to do it ?
Thanks
Francesco

Hi,
The configuration you are talking about is possible. All the information is here http://edocs.bea.com/wls/docs81/cluster/load_balancing.html#1026240 , and here http://edocs.bea.com/wls/docs81/cluster/bigip.html#618892
Regards,
LG

Weblogic cluster software load balancer

Hi,
We are currently using Weblogic domain as a Proxy Plug-In for High Availability test as it’s explained in this blog http://andrejusb.blogspot.com/2009/04/weblogic-load-balancing-for-oracle-adf.html.
Its working fine for POC project but what software load balancer would you recommended for production environment on Linux? (Assume that we don’t have a hardware load balancer).
- Oracle active-passive OHS web-tier clustering.
-Using Linux open source Linux Software(e.g. HAProxy and KeepAlived as explained here http://biemond.blogspot.com/2010/04/high-availability-load-balancer- for.html
-Using any other software load Balancer
I would appreciate if anybody can provide some recommendations/links etc.
Thanks
Alex

Hi Alex,
Yes you should never use HttpClusterServlet, not even for fun ;-)
We use mod_wl (Web Server Plug-In) for Apache for several customers and that works fine.
Check this:
http://docs.oracle.com/cd/E23943_01/web.1111/e14395/toc.htm
Regards Peter

Weblogic Apache Plugin

Hello,
I am running Apache 2.2 and WebLogic 10.3 and I am trying to get Apache to listen for server.domain.com on port 80 and load the redirect.html file that will redirect the user to httpS://server.domain.com. But it is trying to proxy the port 80 request to weblogic. Any ideas?
I have setup virtual host in apache as follows:
<VirtualHost x.x.x.x:80>
ServerName server.domain.com
DocumentRoot /usr/local/apache2/htdocs/redirect
DirectoryIndex redirect.html
</VirtualHost>
<VirtualHost x.x.x.x:443>
ServerName server.domain.com
<IfModule mod_weblogic.c>
SetHandler weblogic-handler
WebLogicHost wbapp04.ipaper.com
WebLogicPort 8001
MatchExpression *.jsp
DebugConfigInfo ON
DynamicServerList OFF
HungServerRecoverSecs 900
</IfModule>
SSLEngine On
SSLCertificateFile conf/certs/wbdev.ipaper.com.crt
SSLCertificateKeyFile conf/certs/workbrain.key
DocumentRoot /usr/local/apache2/htdocs/
</VirtualHost>
Thanks,
Keith

Hi,
Weblogic plugin has a log as well and you can try to enable it to see if the connection is working fine from 443 virtual host to weblogic.
To enable it: http://download.oracle.com/docs/cd/E11035_01/wls100/plugins/plugin_params.html#wp1143055
Parameter: Debug
Thanks.

WebLogic Apache plugin giving 404 for 50% of requests

I have the following configuration on my httpd.conf
<IfModule mod_weblogic.c>
RequireSSLHostMatch false
Debug ON
EnforceBasicConstraints OFF
HungServerRecoverSecs 5
ConnectRetrySecs 0
KeepAliveEnabled ON
KeepAliveSecs 15
IdemPotent ON
WLLogFile /var/log/httpd/wlproxy_global.log
DebugConfigInfo On
</IfModule>
And this Location configured:
<Location /FaleConosco>
SetHandler weblogic-handler
WebLogicCluster 10.8.90.147:7006
Debug ON
WLLogFile "/var/log/httpd/wlproxy-faleconosco.log"
</Location>
And this is what's happening:
1 - Half of requests through Apache, get a 404
2 - All requests that go directly to WebLogic, get a 200
Any idea?
Edited by: 938972 on Jun 6, 2012 7:48 AM

It seems that the WebLogic plugin for Apache has a bug (where do I submit bugs?)
If WebLogicCluster is used with only one server, there might be problems with requests being missed.
I changed the above configuration to use the WebLogicHost / WebLogicPort, and now I get 100% of HTTP/1.1 200
<Location /FaleConosco>
SetHandler weblogic-handler
# WebLogicCluster 10.8.90.147:7006
WebLogicHost 10.8.90.147
WebLogicPort 7006
Debug OFF
WLLogFile "/var/log/httpd/wlproxy-faleconosco.log"
</Location>
Hope this thread will help others

Weblogic apache plugin and webservices

Can I use the weblogic plugin on a DMZ based Apache server and use a 3 tier architecture
to implement webservices.
Using this model can a external application contact my webservices running in
my internal network and can my weblogic/webservices server contact an external
application/webservices using the same route i.e through the apache webserver
and weblogic plugin.
Any documentation regarding the architecture?

Hi Anil,
Not sure this is possible, unless you are using it as a proxy and setup
the proper host/port mappings, see:
http://edocs.bea.com/wls/docs81/webserv/client.html#1072224
We have a very responsive security newsgroup, you might ask your
configuration question there:
http://newsgroups.bea.com/cgi-bin/dnewsweb?cmd=xover&group=weblogic.developer.interest.security&utag=
Sorry, not much help (SNMH)
Bruce
Anil Jacob wrote:
>
Can I use the weblogic plugin on a DMZ based Apache server and use a 3 tier architecture
to implement webservices.
Using this model can a external application contact my webservices running in
my internal network and can my weblogic/webservices server contact an external
application/webservices using the same route i.e through the apache webserver
and weblogic plugin.
Any documentation regarding the architecture?

Wlp and apache load balancing

Hi,
          I have been trying to understand webloigc clustering and load balancing capabilities. I have been through the edocs but it does not explain how things work, instead they only emphasis on how to configure.
          Consider the following scenario:
          --------cisco firewall/load balancer------------
          apatche1 apache2 apache3
          -------------------firewall-------------------------
          WLP1 WLP2 WLP3 WLP4
          My questions are:
          (1) how apache servers load balance incoming requests amongst the four portal instances? I understand that it will use weblogic proxy plug-in. the httpd.config also should be configured to proxy requests to WLP instances by adding the corresponding address:prot entries for each instance, using WebLogicCluster keyword.
          (2) Weblogic cluster will have nothing to do with load balancing? The only benefit I get of configuring weblogic cluster is session replication, right?
          (3) even failover is going to be handled by apache servers?
          (4) if I need to use SSL and I need to have my SSL encryption/decryption to be done on WLP instances; apache servers will only forward requests, no encryption/decryption to be done on the web tier. Is this possible?
          See in WebSphere the edge component will handle the load balancing and through it I can assign load weights for each appserver instance.
          (5) Are there any best practice to implement load balancing and failover on weblogic portal?
          I appreciate any input in this regards.

1. yes, configure the apache plugin. put your 4 servers in the WeblogicCluster property (host:port,host:port...). The proxy will round robin requests between the servers in the cluster, although sessions are pinned to a single server. So if a request with a session (jsessionid cookie) comes in, it will read the primary server from the cookie and route it to that server.
note that we have had trouble with keep alives ON and load balancing. we had to turn keep alives off to get load balancing working.
2. right, the cluster allows failover by replication. apache plugin will perform the failover.
3. the plugin will keep a dynamic server list so if a server goes down, it will update the cluster list and not route to it. it will also retry requests on another server on an error or timeout connecting. you can tweak timeout settings like WLSocketTimeoutSecs and ConnectTimeoutSecs. and keep idempotent ON which allows failover, unless you aplpication can't handle this.

Apache Plugin is not working with Cluster Entry in httpd.conf

Hi Guys,
We have a very particular issue that is happening here in our production environments. Before explaining the issue to you, I will just give a brief of our architecture.
We are using Weblogic Portal Platform SP4.
Our current Production Domain Consists of 1 Admin Server and 2 Managed Servers. The managed servers are in a cluster.
We have two Linux boxes on which the weblogic servers are running. These two machines have IPs: x.x.x.58 and x.x.x.59. Now, the Admin Server and managed Server 1 are started on the machine x.x.x.58 and managed server 2 is started on the machine x.x.x.59. Both the managedServers listen on port 8007.
This entire setup mentioned in the above paragraph is at a location A (lets say).
Now, the requests are proxied to the managed server cluster using BEA's Apache plugin residing on Apache. Apache is running on two Linux boxes that are present at a location B.
Location B is connected to Location A by a dedicated WAN Link.
Now, before the two Apache servers there is a physical Load Balancer that balances the requests between the two Apache boxes.
This means that whenever there is a request from the Internet to the weblogic cluster, the load balancer first sends it to either of the Apache servers and then the BEA Apache plugin on that Apache forwards the request via the 2 mbps WAN link to the weblogic cluster.
Now following is the description of the issue we are facing. We donot know whether the issue is with the plugin or with weblogic server.
In order that the plugin load balances the requests between the servers in the cluster and for failover, the following entry was put in httpd.conf on both the Apache Servers.
WebLogicCluster y.y.y.11:8007,y.y.y.13:8007
Note: Because of the WAN link there is natting used. This implies y.y.y.11 is natted to x.x.x.58 and y.y.y.13 is natted to x.x.x.59.
Here in lies the issue. When we use this plugin entry the following issue occurs.
1.     First we go to the home page and login.
2.     The user is then redirected to a Portal Desktop fitting those credentials.
3.     Now on this Portal Desktop, invariably whenever we click any of the desktop's links, an HTTP 403 is thrown. This error is thrown because on the desktop there are entitlements so that it cannot be accessed without a user logging in with credentials. But this error indicates that the server is losing the session and entitlement details.
Why does this happen?
As a result, we cannot use that plugin entry. The current entry we have is
WebLogicHost y.y.y.11
WebLogicPort 8007
As you can see, here we are only redirecting to one managed server. This entry is not what we want, obviously because if that server fails, the plugin wont know which other server to pass the request on to. Also in this case there is no load balancing.
Our issues our,
1. How to resolve this plugin entry issue. How can we use the cluster entry without encountering this HTTP 403 Error?
3. Consider the following sequence of steps.
- Request for the home page is served by Apache Server 1
- User logins in, the login request is sent by the Load Balancer to Apache Server 1 and plugin on Apache Server 1 sends it to the cluster via WAN l ink. Then the internal mechanism works with creating the session id and primary server and secondary server and logs the user in and sends the response via Apache Server 1.
- Now, the user clicks a link on the desktop. The request now goes to the load balancer and it sends it to Apache Server 2.
The question is now does the plugin on Apache server 2 correctly understand and send the request to the primary server of that session.
Pls help me as to giving me some direction in resolving this issue

From your Xorg.0.log:
(II) fglrx(0): DRIScreenInit done
(II) fglrx(0): Kernel Module Version Information:
(II) fglrx(0): Name: fglrx
(II) fglrx(0): Version: 8.49.7
(II) fglrx(0): Date: May 12 2008
(II) fglrx(0): Desc: ATI FireGL DRM kernel module
(WW) fglrx(0): Kernel Module version does *not* match driver.
(EE) fglrx(0): incompatible kernel module detected - HW accelerated OpenGL will not work
You have to quit X, then rmmod and modprobe the kernel module - you're still using the old one. (a reboot would technically fix it too)
# rmmod fglrx
# modprobe fglrx
# dmesg | tail
The dmesg output should say you've successfully loaded the 8.501 driver.

Load-balancing using ServerIrons or NetApp Netcaches

          Dear all,
          From a cursory search, this one has been asked loads of times, but I can't find
          an answer....
          We're adding a Weblogic cluster into a resilient environment which has Netcache
          boxes doing reverse proxy and content caching, and Foundry ServerIrons doing the
          load-balancing. We could add in a pair of Apache servers load-balanced by the
          serverIrons and a pair of weblogic boxes in a cluster. However, this is not only
          a bit of overkill, but also adds quite a bit of latency to requests. We also
          already have the Netcache boxes. So, we want to get rid of Apache, and use a
          proposed 3 tier environment:
          Netcache
          |
          | (possibly via a serverIron)
          v
          Weblogic Cluster
          |
          |
          v
          Oracle
          Will this work? Does anyone have any experience extracting the session ID on
          a serverIron (or even on a netcache itself)? Has anyone found a way of doing
          session failover using a serverIron?
          Words of wisdom are needed for a flagging technical consultant...
          Thanks
          Simon Redding
          Technical Specialist
          Environment Agency


Good day Simon,
          We have the same setup and have the same questions. Did you find how to implement this?
          Any help would be great!
          Cheers

Best way for HTTP load balancing in OSB

Hi everybody,
We have setup an OSB cluster and we need to load balance HTTP requests across managed servers. Looking for info about load balancing in OSB I found that there are mainly two options: using a hardware load balancer or a software solution like Weblogic HttpClusterServlet. At the moment we have no hardware balancer available so we will have to take the software option. I found some articles about configuring HttpClusterServlet like http://redstack.wordpress.com/2010/12/20/using-weblogic-as-a-load-balancer.
But I have a question about this configuration. If we use a managed server as an HTTP proxy that balances requests between OSB managed servers, what would happen if this server goes down? I think one of the main goals of a clustered deployment is avoiding a single point of failure but with that setup all requests would depend on the availability of the proxy managed server.
Could you recommend us a setup for implementing load balancing in OSB?
Thank you in advance,
Daniel.

Load balancing in a cluster for http requests can be achieved using atleast 4 different ways:
(1)- use a hardware load balancer like F5 BigIP LTM
(2)- use a web server with weblogic plugin to frontend the cluster
(3)- use weblogic with HTTPClusterServlet
(4)- use DNS round robin - this works if you have managed servers running on 2 machines (say mach1, mach2) but on the same port. HTTP clients use hostname 'mach' to access the URL's and the dns does a round robin name resolution of mach to mach 1 and mach2 IP addresses..
All the options except (1) achieve only load balancing and not auto failover on all instances.. Hardware load balancers has the extra feature of probing [ sending periodic pings to the targets] , by which it can detect whether the target resource is alive and if not send the traffic to other nodes which are alive.. this is why hardware load balancers are worth their investment..
other options may work if client is coded to do retrying on failure.. so on 2nd or subsequent attempt, the routing is done to the machine which is alive..
For options (1),(2) and (3), you also need some redundancy of load balancing device ( web server, weblogic or hardware load balancer) to prevent single point of failure.. Hardware load balancers are usually deployed in redundant pairs to achieve this..
Edited by: atheek1 on 22/11/2011 15:31

Load balancing is not working correctly during server fail-over

Hi,
          We have 4 weblogic instances in a cluster with proxy-plugin load balancing the requests. When instance 1 is shutdown, all the subsequent requests from users whose sessions were at instance1 are sent over to instance2 only. They are not divided between instance2, instance3 and instance4.
          Can somebody, please, tell if there is any solution to this so that sessions for users who were being redirected to instance1 will be divided between instances 2,3 and 4.
          Thanks,
          Prasad

It is not possible because in a cluster server1 always chooses the same secondary server (with some algorithm)
          So all sessions with primaries on server1 will have secondaries on same secondary server.
          So if primary is down, all the requests(that has primaries on server1) will be routed to the same secondary server.
          -Vijay

Weblogic Apache Plugin - Load Balancing

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