How are JNDI lookups load balanced through software?

Presumably they are not generally speaking.
          I can see how HTTP Requests are via HttpClusterServlet but how are the
          JNDI lookups handled if the client isn't specify a specific node in their
          intialcontext?

Is there any way of doing that with one nic only?
          Rajesh Mirchandani <[email protected]> wrote in message news:<[email protected]>...
          > You machine could be multi-homed.
          >
          > Robert Nicholson wrote:
          >
          > > Specifically how can I run multiple clusternodes on the same machine and
          > > still load balance my JNDI lookups across them if obviously they are not all
          > > running on the same port and I cannot use
          > >
          > > ht.put(Context.PROVIDER_URL, "t3://acme1,acme2,acme3:7001");
          > >
          > > like syntax.
          > >
          > > "Robert Nicholson" <[email protected]> wrote in message
          > > news:[email protected]..
          > > > Presumably they are not generally speaking.
          > > >
          > > > I can see how HTTP Requests are via HttpClusterServlet but how are the
          > > > JNDI lookups handled if the client isn't specify a specific node in their
          > > > intialcontext?
          > > >
          > > >

Similar Messages

URL Load Balancing through Web Dispatcher

Dears,
We are facing heavy load on our portal server.
We are planning to installed one J2ee Dialog instance for it.
Please suggest how can we configure Url Load Balancing through Web Dispatcher.
Regards,
Shivam

HI Shivam,
While installing webdispatcher you provide Hostname and http message server port of j2ee of CI .
So , webdispatcher communicate directly with message server, where message server check which application server is free and hence forward the request to that specify application server of j2ee instance.
Pls find the below link for configuring webdispatcher
http://help.sap.com/saphelp_nw04/helpdata/en/42/5cfd3b0e59774ee10000000a114084/content.htm
Thanks
Anil

How to monitor targets which are controlled by LOAD BALANCING mechanism

Hi,
I have installed Enterprise Manager 10.1.0.3 and upgraded it to 10.1.0.5. Then i have applied the Application plug-in patch for managing Oracle Applications.In my environment, we have two concurrent managers and four forms servers which are using Load Balancer.Please let me how to manage these concurrent managers and forms servers in that scenario.Would highly appreciate your suggestions regarding the same.Thanks in advance.
Regards,
Vamsi Manyam

This note shows how to configure OEM behind a load balancer.
The question was how to use OEM, not behind a load balancer, to monitor other targets which are behind one or different load balancers.
For example, to monitor :
Forms on server A and B behind load balancer LB1.
Forms on server C and D behind load balancer LB1.
Forms on server E and F behind load balancer LB2.
Gary

How can I design Load Balancing for distant Datacenters? without single point of failure

Dear Experts,
We are using the following very old and passive method of redundancy for our cload SaaS but it's time to make it approperiate. Can youplease advise:
Current issues:
1. No load balancing. IP selection is based on primary and secondary IP configurations. If Primary fails to respond, IP record for DNS changes to secondary IP with TTL=1min
2. When primary server fails, it takes around 15 min for clients to access the servers. Way too long!
The target:
A. Activate a load balancing mechanism to utilized the stand-by server.
B. How can the solution be designed to avoid single point of failure? In the previous example, UltraDNS is a single point of failure.
C. If using GSS is the solution, how can it be designed in both server locations (for active redundancy) using ordinary DNS server?
D. How can HSRP, GSS, GSLB, and/or VIP be used? What would be the best solution?
Servers are running ORACLE DB, MS SQL, and tomcat with 2x SAN of 64TB each.

Hi Codlick,
the answer is, you cannot (switch to two web dispatchers).
If you want to use two web dispatchers, they need something in front, like a hardware load balancer. This would actually work, as WD know their sessions and sticky servers for those. But remember you always need a single point for the incoming address (ip).
Your problem really is about switchover groups. Both WD need to run in different switchover groups and need to switch to the same third software. I'm not sure if your switchover software can handle this (I'm not even sure if anyone can do this...), as this means the third WD needs to be in two switchover groups at the same time.
Hope this helps,
Regards,
Benny

How to check the load balancing in Oracle 11gR2 2 node RAC

Dear All,
Can any one please assist me how to check whether the incoming connections are evenly distributing across the nodes..?
We have two nodes, when we check the sessions counts in both nodes, Most of the time we could see node -1 has more no of sessions than node-2..? So just wanted to know whether load balancing is happening or not ...? If not how to enable it and distribute the incoming connections evenly..?
Oracle 11gR2 / RHEL5

SQL> select inst_id,count(*) from gv$session where username is not null group by inst_id;
INST_ID COUNT(*)
1 43
2 40
Not sure how to check the users are connecting through scan or not ..? But below are scan setttings...
SQL> !srvctl config scan_listener
SCAN Listener LISTENER_SCAN1 exists. Port: TCP:1521
SCAN Listener LISTENER_SCAN2 exists. Port: TCP:1521
SCAN Listener LISTENER_SCAN3 exists. Port: TCP:1521
SQL> !srvctl status scan_listener
SCAN Listener LISTENER_SCAN1 is enabled
SCAN listener LISTENER_SCAN1 is running on node za-rac-prd-02
SCAN Listener LISTENER_SCAN2 is enabled
SCAN listener LISTENER_SCAN2 is running on node za-rac-prd-01
SCAN Listener LISTENER_SCAN3 is enabled
SCAN listener LISTENER_SCAN3 is running on node za-rac-prd-01
SQL> !srvctl config scan
SCAN name: rac_prd.abc.local, Network: 1/10.100.130.0/255.255.255.192/eth6.64
SCAN VIP name: scan1, IP: /rac_prd.abc.local/10.100.130.55
SCAN VIP name: scan2, IP: /rac_prd.abc.local/10.100.130.54
SCAN VIP name: scan3, IP: /rac_prd.abc.local/10.100.130.53
SQL>

Load Balancing through Web Dispatcher

Dears,
We are using ECC 6.04 with two application servers and EP 7.01 installed on AIX and database is oracle.
We are using ESS in EP.
In our current scenario when User login into EP to use ESS they get connected to only central instance of our ECC server.
Now we want to do load balancing in EP so that users can connect to central and dialog instances of our ECC server according to available work load.
Please suggest how can we configure it.
Regards,
Shivam Mittal

Dear Mark,
Thanks for the reply.
Presently in our ECC server,We have three logon group everyone pointing to different instance.
Please confirm how can we create logon group inclusive of all instances and In EP also where we need to maintain
settings to connect to backend system via logon group.
Please suggest.
Regards,
Shivam

How to config CSM load balance of http combined https

In this case,when I config CSM for load balance http and https service separately was ok.2 VIPs , 2 Serverfarms, One for http , and one for https .But I found that the https would referred to http information on IIS , because when the client first to access http is ok,and then login by https ,the information is not right.So,how to config CSM in this case,any reply will be very be appreciated.

There are 2 different ways.
You could combine the 2 vserver into a single one by not specifying the tcp port.
Another solution would be to use the same sticky group for both vservers.
For example, you could use sticky srcip.
ie:
sticky 10 netmask /32 address source
vserver http
sticky 60 group 10
inservice
vserver https
sticky 60 group 10
inservice
Regards,
Gilles.
Thanks for rating this answer.

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>
**************************************************************

How to set up load balancing with overload server on css

can anyone tell me how to set up a load balancing config on css that will enable me to LB proxy caches and when they have too many connections then LB against an overload proxy-cache.
Such that when the normal proxy-cache farm is under the ceiling of max connections then the overload server is not used ?
I don't think redirect or sorry server will do this ?

see the below configuration,any question,just tell me.
service proxy-1
! below is the real ip of server
ip address 10.1.1.1
keepalive type icmp
active
service proxy-2
ip address 10.1.1.2
keepalive type icmp
active
! enter owner config-mode
owner proxy
! define a content rule,match what you want to load balancing
content rule-proxy
! below is virtual ip,it can be another ip segment
vip address 10.1.1.50
add service proxy-1
add service proxy-2
protocol any
advanced-balance sticky-srcip
active

How to control a Load Balanced set in IaaS VMs using Text files

Hi,
I would like to control the Load Balanced nodes Using a resource to probe like active.txt in IIS than a Endpoint on the Management Portal.
The reason i need this is because the engineers in my team will have access to VMs but not to Management servers.
Any info on it is very helpful.
Thanks

Hi,
You can Control the access to the Load Balanced Set by using Network ACL. A Network Access Control List (ACL) is a security enhancement available for your Azure deployment. An ACL provides the ability to selectively permit or deny traffic for a virtual machine
endpoint. This packet filtering capability provides an additional layer of security.
Using Network ACLs, you can do the following:
Selectively permit or deny incoming traffic based on remote subnet IPv4 address range to a virtual machine input endpoint.
Blacklist IP addresses
Create multiple rules per virtual machine endpoint
Specify up to 50 ACL rules per virtual machine endpoint
Use rule ordering to ensure the correct set of rules are applied on a given virtual machine endpoint (lowest to highest)
Specify an ACL for a specific remote subnet IPv4 address.
Network ACLs can be specified on a Load balanced set (LB Set) endpoint. If an ACL is specified for a LB Set, the Network ACL is applied to all Virtual Machines in that LB Set. For example, if a LB Set is created with “Port 80” and the LB Set contains 3 VMs,
the Network ACL created on endpoint “Port 80” of one VM will automatically apply to the other VMs.
Hope this helps !
Regards,
Sowmya

How to enable Network load balancing for Enterprise portal

Hello,
We have installed EP 7.0 central instance(00) and dialog instance (01) and would like to enable network load balancing between these two EP servers.Have installed network balancer and the configuration has been done at network level.
The below URLs are being used for accessing the portal
Central instance :
http://CIhostname:50000/irj/portal
Dialog Instance:
http://DIhostname:50100/irj/portal
Both the port number has to be same for enabling load balancing.In order to acive this we have to map this port to http port by making some changes in Visual Administrator.
Can you please let me know step by step procedure or any link where i can find the same?
Appreciate your response
Thanks,
Vadi

Dear Jay,
Thnaks for your reply.
No...NLB will helpful in load balancing between different 2 different application (Ep)servers.
We are using microsoft network load balancer.Found the service http provider in VA for making those changes.
Any way thanks.
Regards,
Vadi

CISCO 3945 Router - ARE POWER SUPPLIES LOAD BALANCED?

CISCO 3945 Routers - Are the 3945 Router power supplies load balanced by default?
We are trying to determine if our switch/server rack at our remote location has maxed out it's power load requirements. I just need to know if the 3945 power supplies load balance by default or if the redundant power supply is ON but not really providing the router with power and is just there incase the other power supply fails - Thank you.

Thank you for your reply. I had read that the "Cisco 3845 and 3845-NOVPN router accommodates two hot-swappable power supplies and a single power supply meets router requirements. The second power supply provides redundancy, load sharing, and increased router availability. Either power supply can be removed without affecting router operation. Any combination of two power supplies is permitted."
Unfortunately, I couldn't find any specific information for the 3900 series routers that stated it also load balanced power.
Follow-up question: Do you know if the 3800 series routers load share by default? I know it is capable of power load sharing based on the above description but do they load share equally by default? If that's the case for the 3800's then hopefully that's the case for the 3900'S series routers. Which means, we have not maxed out our power requirements in our racks.

How are JNDI and JDBC related or implemented using EJB's

For instance if I create an Entity bean, how do I get access to the database?
Do I create some sort of connection method?
Is JNDI used to lookup the beans and JDBC separate from that only to connect to the database?
I am a little confused.
Thanks.

Hello,
With respect to entity bean you need a Datasource for obtaining a sql connection to database. After obtaining a connection to database you can persist your entity bean's state to database.
Once you create a datasource, you have to bind it to a JNDI name. This JNDI name can then be used to lookup datasource, just like you use telephone directory to obtain a person's telephone no if you have his address.
You also bind your enity bean to a unique JNDI name so that clients can lookup the bean and use services offered by it.
JNDI is used to lookup EJBs, datasources, JMS Connection factories, etc and JDBC is used so that you can persist your enterprise java bean's state to database.
HTH
VJ

How do I down load the latest software for my ipad2?

How do I download the latest software for my ipad2? I do not see a button to upgrade under general settings.

That is only a feature of iOS 5 or later... If you have iOS 4... See Here...
http://support.apple.com/kb/HT4972
Connect to iTunes on the computer you usually Sync with and “ Check for Updates “...
See the Using iTunes Section Here...
How to update your iPhone, iPad, or iPod touch

How to achive failover & load balancing

Hi ,
I have installed WebLogic server 5.1,
I followed one documentation for clustering.
I don't know how to set up cluster configuration WebLogic.property file.
If you have any sample property please
send it to me,
Thanks

I think the best way is to follow the documentation.
Attached is my startup script.
Cheers - Wei
Sanjay <[email protected]> wrote in message
news:399959ba$[email protected]..
Hi ,
I have installed WebLogic server 5.1,
I followed one documentation for clustering.
I don't know how to set up cluster configuration WebLogic.property file.
If you have any sample property please
send it to me,
Thanks[swc1.cmd]

How are JNDI lookups load balanced through software?

Similar Messages

Maybe you are looking for