Load balancing server names

My Application is handled by three load balanced servers.I have a functionality in which first i send a request for a document printing.This request is posted in Database.Then a backend script runs and takes each requets in DB and executes and creates a file and places in server space. This works fine when i have only one server.But when i have load balanced servers user can give request for print from one server(he does know where from he is giving) and backend shell scripts can take the OPEN record from DB and execute in another server.So user is not able to find the document thought his request is processed.I have tried to know the DNS names of teh server whose are taking the print request so that i can track. But when i check with ServletRequest.getServerName() but i always get the application URL not teh specific load balance server name. I am tryong my luck with java.net.InetAddress

Hey i could solve this problem. i have used java.net.InetAddress class and its methods to know the system name on which my code is executing.
Viswanath

Similar Messages

Load Balancing Server Error

Hi Expert's
          I am working on Netweaver BI integrated with EP. while creating JCo destinations for both model and meta data, we have an option of selecting load balancing server and application server. the connection with application server is working fine but when come's to load balancing server it is asking for system group.
         Added to this we are working on single server. Pls let us know is system group is necessary? also let us know where to create system group?
Regards
Subbaraju

Hi Ashok,
           As I already mentioned we are working on BI 7.0 We are facing problem while Configuring JCo destinations In JCo we have maintained Meta and Model Data using load balancing server and application server Now when using Tr.RSPLAN and selecting START MODELER it is routing into local host. But after logging, It is routing to standard SAP host (host=pwdfm101) instead of our local host .
Note: Routing means opening the web Dynpro page.
I hope this makes things clear.
Regards
Subbaraju

Load balance server

Hello all,
I am using Hyperion v11.1.1.1.0.
I want to install FDM 11.1.1.
Will it work fine with hyperion 11.1.1.1.0?
It is written in the documentation that we need to install & configure Load Balance Server
properly prior to installing FDM.
How to install Load balance server and from where will I get the software for Load balance server?
Thanks

As Gilles said you need to make sure that the return traffic from the real server should come back to CSS.
Your routing infrastructure should ensure that flow should be the following for both "real server in the same DC" & "Real Server in Different DC".
1. Client Traffic should hit the VIP configured on CSS.
2. CSS should forward the client request to the Selected Real Server.
3. Real Server's Response should reach CSS. (It should not go to Client directly)
4. CSS should send the response on Real Server's behalf.
As long as the above conditions are met you are fine. Step 3 is the key and becomes could become tricky for Remote Real Servers.
HTH
Syed Iftekhar Ahmed

System with load balancing server

Hi All,
We are having SAP NW 7.0 Portal and back end we have R3 implemented in a cluster environment. The system object in EP have used "System with Load balancing" template; using the LOGON group and the other related parameters.
But we have some problem with the ITS and WAS parameters; since we are using some Transaction iViews.
Let me explain.. for the R3 cluster we have 2 systems PROD1.domain.ext and PROD2.domain.ext. Now in the system object in portal, how to specify the parameters for ITS and WAS parameters? Since the host name in these we need to specify a single server which defeats the basic purpose of having clustered environment.
Can any one please help in resolving this issue.
Thanks,
Sravanthi

Hi Sravanthi,
Please check the below for finding ITS and WAS parameters from backend :
For ITS - Go to SE37 >> Utilities >> Setting >> Click on ICON Right Top Corner in popup window >> Select Internet Transaction Server >> you will find the Standard Path and HTTP URL.
For WAS - Go to SE37 >> Run FM - RSBB_URL_PREFIX_GET >> Execute it >> you will find PRefix and PAth paramter for WAS.
Please refer to this may help step-by-step : How-to create a portal system for using it in Visual Composer
Hope it helps
Regards
Arun

Error in creation of JCO with Load balancing server

Hi,
We are using a ABAP user base for our WEBAS server 6.40 (with ABAP+JAVA). i have created a Public group in concerned ECC 5.0 system. I have already configured SLD, and then i maintain data supplier bridge in SLD and run RZ70 in ECC 5.0 system to load system information.. i can see details in SLD ..
now i am trying to create JCO connections .. here i am unable to create JCO with load balancing option.. i get
com.sap.mw.jco.JCO$Exception: (102) RFC_ERROR_COMMUNICATION: Connect to message server host failed Connect_PM TYPE=B MSHOST=<servername> GROUP=PUBLIC R3NAME=SID MSSERV=sapms<SID> PCS=1 ERROR service 'sapms<SID>' unknown TIME Fri Jun 16 12:41:20 2006 RELEASE 640 COMPONENT NI (network interface) VERSION 37 RC -3 MODULE ninti.c LINE 505 DETAIL NiPGetServByName2: service 'sapms<SID>' not found SYSTEM CALL getservbyname_r COUNTER 1
i am able to create single server JCO, but it fails in load balancing.. is there anything i have missed out in settings...
Thanks and regards,
Sudhir

Thanks, Bogdan Rokosa
I have the same problem,and solved it following the steps provided by Bogdan Rokosa :
you must insert an entry for your R3 system
(like: sapms<SID> 3600/tcp)
in services file
(C:\WINDOWS\system32\drivers\etc\services) on Java WAS.
I test the Jco successful without restart J2EE Engine.

Load Balancing, Server and / or Client ?

Hi
I am experiencing a problem with the connection pooling in odp.net. I have a simple test app that creates a connection, executes a query, populates an object then closes the connection. I have found that when I have client side load balancing on via the odp.net connection string property many connections are made unnecessary (sometime the actual number created reaches the max pool size but the numbers differ randomly). It appears that rather than a free connection in the pool being used more connections are being created which defeats the point of having a connection pool. I do have server side load balancing configured correctly also. Due to this finding can someone possibly answer the following questions.
a) Do I need both server side and client side load balancing set?
b) If I do why is the above behaviour being seen? If not could you give me a short explanation as to why not?
Current set up is 11g (patched to 6, awaiting 7 to be applied) RAC, 2 nodes.
Below is the C# code used while testing this. The table queried is a simple person table containing 16000 rows if data.
OcConnection = "User Id=XXX; Password=XXX; Connection Lifetime = 60; Data Source=(DESCRIPTION=(ADDRESS_LIST=(FAILOVER=on)(LOAD_BALANCE=off)(ADDRESS=(PROTOCOL=tcp)(HOST=XXX)(PORT=1521))(ADDRESS=(PROTOCOL=tcp)(HOST=XXX)(PORT=1521)))(CONNECT_DATA=(SERVICE_NAME=MyFirstTest))); Pooling=true; HA Events = true; Load Balancing = true";
Code:-
Oracle.DataAccess.Client.OracleConnection con;
con = new Oracle.DataAccess.Client.OracleConnection();
con.ConnectionString =OcConnection;
con.Open();
// the command object to use for this test
OracleCommand cmd = con.CreateCommand();
cmd.CommandText = "select * from PERSON";
OracleDataReader rdr = cmd.ExecuteReader();
List<test> listTest = new List<test>();
while (rdr.Read())
test dc = new test();
if (!rdr.IsDBNull(0))
dc.id = Convert.ToInt32(rdr.GetValue(0));
if (!rdr.IsDBNull(1))
dc.forename = rdr.GetString(1);
if (!rdr.IsDBNull(2))
dc.surname = rdr.GetString(2);
if (!rdr.IsDBNull(3))
dc.street = rdr.GetString(3);
if (!rdr.IsDBNull(4))
dc.city = rdr.GetString(4);
if (!rdr.IsDBNull(5))
dc.postcode = rdr.GetString(5);
if (!rdr.IsDBNull(6))
dc.country = rdr.GetString(6);
if (!rdr.IsDBNull(7))
dc.email = rdr.GetString(7);
if (!rdr.IsDBNull(8))
dc.dateadded = rdr.GetDateTime(8);
if (!rdr.IsDBNull(9))
dc.randWords = rdr.GetString(9);
if (!rdr.IsDBNull(10))
dc.uniqueNumber = Convert.ToInt32(rdr.GetValue(10));
listTest.Add(dc);
rdr.Close();
con.Close();
rdr.Dispose();
cmd.Dispose();
con.Dispose();
Thanks for your time
Victoria

Here are the HTTP Headers as monitored on the client side. Notice the good.txt file includes a GET as it's initial request. All works fine in this case. However, the initial request in the bad.txt is a POST. This is odd since the URL was opened using the same shortcut in both incidents and the browser was closed between each trace that was taken. I've also reviewed the shortcut with notepad to verify it does not include unwanted data such as the JSESSIONID info....etc.
Once you have reviewed the HTTP headers, I have these questions.
1. IIS is sending the 100 Continue messages as you mention, but why is the CSS injecting the cookie in a 100 response that is not typically processed by the client? The bad.txt file shows the client receiving two ARPT cookies because the first cookie in the 100 continue response was ignored.
2. I know Cisco is not really in the business of troubleshooting browser behaviour. But do you know why the browser would behave differently....GET in one request and a POST in the next? We do not wish to get into modifying the browser, so I'm hoping we can provide a solution on the server side that will allow the browser to function this way if it chooses to do so. Do you think it would make sence to push the state management up a level to the cookie handed out by JRUN? This way, the cookie would not be handed back in a 100 response from IIS, and we could tell the CSS to monitor the JRUN cookie. Of course this would require we determine how to manage this cookie either by modifying to cookie to have static data for each server, or by using the right method of hashing...etc.
Chris

Webdispatcher SSL load balance server mismatch errors

We are setting up a webdispatcher to access an Enterprise Portal with multiple instances. Currently it is working but we are having to overide host mismatches. in webdispacther log we see
[Thr 4856] Mon Mar 07 11:38:02 2011
[Thr 4856] MatchTargetName("aaa.mycompany.com", "CN=bbb.mycompany.com, OU=xxx, O=ooo, L=ccc, SP=sss, C=US") FAILS
[Thr 4856] SSL NI-sock: local=##.21.13.137:50746 peer=##.21.13.131:51001
[Thr 4856] <<- ERROR: SapSSLSessionStart(sssl_hdl=0000000008565100)==SSSLERR_SERVER_CERT_MISMATCH
The Portal instances are on
aaa.mycompany.com
bbb.mycompany.com
Currently have a CA approved certificate for each server installed in the portal. Dispatcher on aaa uses aaa cert, dispatcher on bbb uses bbb cert.
Message server is on aaa, but it will load balance and place you on either instance.
have following related parameters
wdisp/ssl_encrypt = 2
wdisp/ssl_auth = 2
wdisp/ssl_cred = C:\usr\sap\XXX\W00\sec\XXX.pse
wdisp/ssl_certhost = aaa.mycompany.com
wdisp/ssl_ignore_host_mismatch = TRUE
C:\usr\sap\XXX\W00\sec\XXX.pse has ssl cert of both aaa and bbb servers.
All seems to be working, as users are load balancing. They are not getting certificate mismatches in their browser anymore. We are getting the SSSLERR_SERVER_CERT_MISMATCH errors, but the messages do not seem to cause an issue since we have wdisp/ssl_ignore_host_mismatch set.
Can we eliminate those mismatch errors instead of masking the problem with wdisp/ssl_ignore_host_mismatch?
Should each portal instance have their own ssl cert, or is there a way to use one cert such as the aaa.mycompany.com cert on each portal instance? It seems like that might eliminate the mismatch errors. However, what happens when you go directly to the bbb.mycompany.com portal instance? there is a certificate error if you specify aaa's and you go to bbb. I was wondering if the wdisp/ssl_auth and wdisp/ssl_certhost are valid in the portal system so that each server uses the aaa server and certificate. I could not tell if this parameter is valid for java-only portal systems.
Thanks for your help.
Edited by: Fett Patrick on Mar 7, 2011 8:35 PM

Thank you Martin for your prompt reply. Can you clarify please, can we use the wdisp/ssl_certhost parameter in the instance profiles of the portal instances? I wasn't sure if that is only valid for webdispatchers or can also be used in abap/java systems?
We orginally had the aaa server certificate listed for each dispatcher in the portal under ssl provider runtime server identity. That caused a browser "certificate error" when accessing the bbb server. So we then installed an ssl certificate for bbb for its dispatcher. We could then go to either server with no browser "certificate mismatch" error.
Then when we added the webdispatcher, we started getting the server mismatch errors at the webdispatcher level. If the wdisp/ssl_certhost can be used in the portal profiles, then that would hopefully resolve direct access or via web dispatcher aceess mismatches. I.E. only the aaa ssl certificate would be used and parameters would be set at both the webdispatcher and portal profiles
Thanks, Pat.

Load Balance serve issue

Hi,
We have defined 2 servers (server1,server2)in FDM and also added these servers in Machine profile.
We are executing UPSshell.exe which should place .dat file in server1. The server name is also specified as server1 in Upsshell script. But, the issue we are facing is, on first execution, .dat is placed in openbacth of server1,while on second execution .dat is placed in server2. This is causing issue in our dataload. Batch load script is looking for file in server1 and since the file is in server2, datais not getting loaded. Can anyone let me know wht am I missing here , as the .dat file is saved in server2, even after specifying serever as server1 in upsshell.exe script.
Appreciate early response as this is refraining us from proceeding ahead ..Thanks

You need to have a single FDM application folder share point, such as FDMDATA and then your application sub-folders beneath it.
Then your application path should be specified as UNC path (\\ServerNameFDMDATA\AppName)
You can update the path using <Add Application>
A) Choose <Add Application> at the login form
B) Login and highlight the application and choose "modify"
C) Update the application path.

How to load balance serving MP4 files via AMS

Hey gurus,
We have one centralized storage server that stores videos, Lets call this Server A, we have 4 more servers that we want to use to load the files from Server A to load balance and location balance the loading of files.
Servers B-E are on a private VLAN with Server A; so what we're doing now is mounting Server A on to Servers B-E and serving the files via AMS; this has proved to be quite inefficient.
For Live Streams; we use multi-point publishing to achieve this; is there a way to do this with recorded files?
Please advise!
Thanks

Here are few bits of info:
For load balancing for Analytics, that isn't officially supported yet for the UI and Administration components. It might work with sticky sessions from portal-to-analytics but that doesn't get you much. Improving the options there would be a good enhancement request.
For the collector, I think there are two important things to remember. Use broadcast mode. I've never actually seen it in unicast mode, but broadcast definitely works. Also, remember that this is all managed by Portal and Analytics - you don't use your own load balancer between Portal instances and the Analytics Collector instances.
Finally, ALUI Directory is not certified to be load balanced yet. On a separate note, ALUI Directory has a socket leak on Windows due to a bug in the version of Jrockit that ships with it. Upgrading the embedded application server for the ALUI/WCI installation to jrockit-R27.5.0-jdk1.5.0_14 will resolve it.

Load Balancing Server reg

Hi Gurus
If i have Installed Foundation services in 4 environments, How HFM will switch to another environments based on Users load ?
Do we need to write any kind of scripts or functions?
regards
Sarilla

self

Two load balanced server sending requests to external system on different protocol

Hi,
I have two loadbalanced OEG servers (server A and server B) with same endpoint configurations in envsetting.props. But when requesting the service, it is creting different URI in both servers. In one of server (server A)it sets URI with following details :
DEBUG   30/Mar/2015:07:29:34.356 [92b0e940]     Set host='abc.tdc.dk'
DEBUG   30/Mar/2015:07:29:34.356 [92b0e940]     Set port='80'
DEBUG   30/Mar/2015:07:29:34.356 [92b0e940]     Set scheme='https'
and fails with following error : ERROR   30/Mar/2015:07:29:34.370 [92b0e940]         [SSL_connect, 0x1220]: error - SSLv2/v3 read server hello A.
However another server (server B),sets URI as :
DEBUG   30/Mar/2015:07:29:34.356 [92b0e940]     Set host='abc.tdc.dk'
DEBUG   30/Mar/2015:07:29:34.356 [92b0e940]     Set port='80'
DEBUG   30/Mar/2015:07:29:34.356 [92b0e940]     Set scheme='http'
and successfully processes the request.
So can you please help here to know even if we are using same endpoints configuration (abc.tdc.dk ) and port (80) on both the servers , then why the URL is set as http on one of server and https on another.
Thanks !!!
Akshay

Hi
Thanks for immediate respose. I tried the ping/acknowledgement example in the biginning itself. It doesn't work. I also tried by changing the agents ( to respective values suitable for my systems) of that example. Then also it failed. The error in that case also same. The message will not propogate from the out going agent.

Using the load balancer

Hi, I just started using the SJWS7.0. When a client sends a request, is the request to the load balancer server name or the admin server name? Any information on how to use the load balancer will also be appreciated

The server where the load balancer is running. The admin server has not play in the load balancing beyond allowing you to configure and manage it using the administration console.

Help: AM Agent working with load balancing AM Server

Hi,
We are trying to set up the policy agent to work with two AM Servers behind a load balancer.
The agent deployment document said that in the AMAgent.properties we must set
com.sun.am.loadBalancer_enable=true
According to the AM deployment guide(http://docs.sun.com/source/817-7644/appE_loadbalancerconfig.html),
we also set in the AMConfig.properties something like
com.iplanet.am.lbcookie.name=server1
com.iplanet.am.lbcookie.value=server1
The loading balancing just does not work. Can anyone explain how AM agent works under such an deployment
environment? Some people say the agent can find the real server using the naming service, but the not
much explanation can be found.
More info on our two machines:
The two AM servers are named server1.domain and server2.domain. The virtual LB name is server.domain.
The two AM servers were installed using the host name server.domain. We added the servers' real name
in the AM's fqdnMap. At the agent config file, the name service is pointing to the LB.
Really appreciated any advices.
Regards,
Henry

Thanks for your reply.
We figured it out lately thanks to help from Bernhard.
1) use each machine's name to install the AM servers using the same LDAP server.
2) In AmAgent.propeties, set com.sun.am.loadBalancer_enable=true
3) In AM server platform, add in all machine's names
4) In Organization alias, add in two machines' name
5) In fqdnMap, add in load balancer's name
6) In LB, set cookie stickiness based on cookie JSESSIONID

App-V 5 Publishing Server + Load Balancing (NetScaler) issue

All,
I have attempted to load balance my App-V 5.0 deployment, which includes two nodes (appv-1 and appv-2) on a Citrix NetScaler VPX appliance.
The management server is working fine, when browsing to the load balanced VIP DNS alias - pass-through authentication works great and the management console is displayed.
When I attempt to browse to the load balanced VIP DNS alias for the Publishing Server, it prompts for authentication credentials, then displays the following error:
Method not allowed. Please see the service help page for constructing valid requests to the service.
When I attempt to browse using the same internet explorer instance to http://appv-1.fqdn:8088 it displays the XML page after entering authentication credentials.
Here is my set-up & what I have done....
Appv-1 Server
Management Server installed on Port:8088
Publishing Server installed on Port:8090
SQL Cluster and Mirroring configured (tested and working)
Appv-2 Server
Management Server installed on Port:8088
Publishing Server installed on Port:8090
SQL Cluster and Mirroring configured (tested and working)
NetScaler
Management VIP: 10.1.1.148
Publishing VIP: 10.1.1.124
Both Appv-1 and Appv-2 are setup as services and bound to the corresponding Virtual Servers.
Load balance alogrith - persistence - source IP: 255.255.255.255 - Least Connection
DNS and AD Modifications
host A record - appvmgmtsrv.fqdn = 10.1.1.148
host A record - appvpubsrv.fqdn = 10.1.1.124
computer object create in same domain for appvmgmtsrv and appvpubsrv
SPN Modifications:
setspn –A http/appvmgmtsrv:8088 domain\appvmgmtsrv
setspn –A http/appvpubsrv:8089 domain\appvpubsrv
setspn –A http/appvmgmtsrv.domain.local:8088 domain\appvmgmtsrv
setspn –A http/appvpubsrv.domain.local:8090 domain\appvpubsrv
IIS Modifications:
Appv-1 and Appv-2 - ApplicationHost.config - modified with below line for both Management and Publishing Server sections:
<windowsAuthentication enabled="true" useKernelMode="true" useAppPoolCredentials="true" />
Rebooted and IIS starts correctly.
Testing
On Appv-1 if I browse to http://appvmgmtsrv.fqdn:8088/console.html it asks for authentication, when authentication is entered it fails.
On another other machine in the environment if I browse to http://appvmgmtsrv.fqdn:8088/console.html it automatically loads the console with the credentials of the logged on user.
Launching the Management Console via Load Balanced DNS name works on every other server except itself.... assume this is Kerberos modifications? (This only happens when I disable the appv-2 node on the load balancer, forcing all IIS connections to Appv-1).
The management server issue above is not a big one and can work around that easily. The major issue is with the Publishing Server. .. .
On Appv-2 if I browse to http://appvpubsrv.fqdn:8090 it will prompt for authentication, once enter it displays: Method not allowed. Please see the service help page for constructing valid requests to the service.
in a new tab if I enter http://appv-1.fqdn:8090 it will prompt for authentication, once enter its displays the XML page with App-V meta-data.
Can anyone shed some light on this issue please.... When I update the App-V client with the load balanced publishing server VIP DNS it displays the following error in the event log:
Getting server publishing data failed.
URL: http://appvpubsrv.fqdn:8090
Error code: 0x45500D27 - 0x80190195
Any help will be greatly appreciated. ....

You could read
https://blog.uvm.edu/jgm/2013/09/26/app-v-5-server-f5-load-balancers-and-kerberos/
https://blog.uvm.edu/jgm/2013/09/27/app-v-server-configuration-load-balanced-configuration/
http://social.technet.microsoft.com/Forums/en-US/2b39e2b8-aba1-4e96-b18f-c5bcb9f12687/load-balancing-two-appv-50-servers-the-publishing-service-is-not-able-to-contact-the-management?forum=mdopappv
http://www.thinclient.net/blog/?p=344
In fact I'm not sure if any of these really helps you, but they give some good advice
Falko
Twitter
@kirk_tn   |   Blog
kirxblog   |   Web
kirx.org   |   Fireside
appvbook.com

Server Load-balancing and ACL router decision

Hello,
My 2 server farm distribution switches are running in "hybrid" mode, with CAT OS on the switch and IOS on the MSFC.
My server team is asking to block traffic to a specific server that is load balanced using Cisco's CSM load-balancer which is also installed in the chassis.
The question that I have is this.
Does anyone know in what order the MSFC will inspect and apply the ACL and when will the CSM make the load balancing decision?
The reason I need to know this is that the CSM is setup in bridged mode, where traffic to the server comes into the MSFC with a destination IP of a VIP which resides on the CSM. Subsequently, the CSM forwards the traffic to the one of the real servers in the load-balanced server farm after it makes its load-balancing decision. Which ocurrs first??
Does anyone have any info on what ocurrs first and so forth??
Is there a link to Cisco's website that explains this process??
Thanks in advance for your help.
Tony

Tony,
It sounds as if your setup is like this:
Client VLAN----MSFC----VLAN A----CSM----Server VLAN
With VLAN A and Server VLAN being the same IP subnet.
In this case all client traffic reaching the VIPs on the CSM first traverses the MSFC. So, if you want to block traffic to a specific VIP or Server IP you can do that on the MSFC's Interface for Client VLAN. You could configure an access list that filters inbound traffic on that VLAN interface.
Make sense?
-Brad

Load balancing server names

Similar Messages

Maybe you are looking for