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WebSphere Application Server and DNS Caching
   

Earlier today, I was having a discussion about DNS caching in WebSphere Application Server, during my presentation - Desktop Single Sign-On in an Active Directory World - to the DanNotes conference here in Denmark.

I'd stated, in error, that WAS caches IP addresses that it retrieves from DNS. Whilst this WAS the case in the past, things have changed with Java 1.4.1 as per this Technote: -


Starting with Java™ 1.4.1, the IP address is not cached by default. This can cause delays and performance degradation if the application relies on this caching mechanism, since a lookup is now performed each time.

The WebSphere Application Server runtime code calls the InetAddress.getLocalHost() method in several places which then causes the DNS lookup requests. Applications making outbound calls would also trigger DNS lookup requests

There is, of course, a solution to this IF it becomes a problem.

There is a JVM setting - com.ibm.cacheLocalHost=true - that can be set, and the Technote shows how to set it for Deployment Manager, Node Agent, server instances etc.

Of course, one would always do this via a script :-)

This Technote - High DNS traffic or slow performance on WebSphere Application Server for z/OS v5.1 and higher - even provides a Python script here to set the parameter for you :-)

PS There's a related setting to "force" WAS to prefer IP v4 rather than v6 - java.net.preferIPv4Stack=true - we've made use of that on my current project.




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http://portal2portal.blogspot.com/2012/05/websphere-application-server-and-dns.html
May 03, 2012
210 hits



Recent Blog Posts
9


IBM HTTP Server - CTGSK3024W Invalid value for parameter from GSK
Mon, Sep 1st 2014 6:05a   Dave Hay
I hit a wee problem with the Global Security Toolkit (GSK) when creating a certificate for IBM HTTP Server 8.5.5.2 This is the command that I was running: - /opt/ibm/HTTPServer/bin/gskcapicmd -cert -create -db /opt/ibm/HTTPServer/ssl/keystore.kdb -pw passw0rd -size 2048 -dn "bam8012.uk.ibm.com,o=ibm,c=us" -label "bam8012.uk.ibm.com" -default_cert yes which resulted in: - CTGSK3024W Invalid value for parameter "-dn" (bam8012.uk.ibm.com,o=ibm,c=us). It was, of course, user error. This i [read] Keywords: ibm security server
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Cognos on Linux - Dependencies - Soup to Nuts
Sat, Aug 30th 2014 11:05a   Dave Hay
A follow-up: - IBM Business Monitor and IBM Cognos - DPR-DPR-1035 Dispatcher detected an error IBM Business Monitor 8.0.1.2, Cognos BI and Unix - Dependencies Again Replicate the problem cd /opt/IBM/WebSphere/AppServer/profiles/AppSrv01/cognos/SupClusterMember1/bin ./BIBusTKServerMain ./BIBusTKServerMain: error while loading shared libraries: libX11.so.6: cannot open shared object file: No such file or directory Diagnose using LDD cd /opt/IBM/WebSphere/AppServer/profiles/AppSrv01/cognos/SupClu [read] Keywords: ibm ldd apple linux server websphere
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Alias command on Unix - why am I late to the party ?
Sat, Aug 30th 2014 9:45a   Dave Hay
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Notes to self - Setting up DB2 Client connectivity
Fri, Aug 29th 2014 8:05a   Dave Hay
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IBM Business Monitor 8.0.1.2, Cognos BI and Unix - Dependencies Again
Thu, Aug 28th 2014 1:25p   Dave Hay
This follows on from an earlier post: - Gah, not again - Installation of IBM Cognos Business Intelligence has failed. I saw this exception: - 10.99.131.190:9081 28605 2014-08-27 06:40:23.824 +0 na na Thread-125 DISP 5003 1 Audit.Other.dispatcher.DISP.pogo pogo com.cognos.pogo.reportservice.ProcessManager Failure DPR-DPR-1035 Dispatcher detected an error.Process BIBusTKServerMain failed to start properly. External Report [read] Keywords: admin ibm ldd R7 aix apple enterprise java linux red hat server websphere
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A Reminder - Which Cluster Does BAM > BPM need ?
Wed, Aug 27th 2014 10:25a   Dave Hay
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116


Gah, not again - Installation of IBM Cognos Business Intelligence has failed.
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As if by magic, here it is again: - ERROR: Error during "install" phase: Installation of IBM Cognos Business Intelligence has failed. Return code : -1 Building upon previous posts: - Here we go again - ERROR: Installation of IBM Cognos Business Intelligence has failed. Installation of IBM Cognos Business Intelligence has failed. Return code : 1 Foiled Again - Installation of IBM Cognos Business Intelligence has failed. Return code : 1 This time I was seeing: - global com.ibm.cognos.exec.I [read] Keywords: ibm eclipse java linux security websphere xml
78


Guidelines for setting ulimits (WebSphere Application Server) - includes RHEL 6 updates
Tue, Aug 26th 2014 1:26p   Dave Hay
Guidelines for setting ulimits (WebSphere Application Server) This document describes various ways to set ulimit values on UNIX and Linux operating systems as well as information that pertains to WebSphere Application Server ...Global settings are set in the file /etc/security/limits.conf.... ...On Red Hat Enterprise Linux 6, why are my settings for nproc (ulimit -u) not being honored. Red Hat Enterprise Linux 6 has introduced a new configuration file, addressed in a bug report, ( /etc/security/ [read] Keywords: ibm application bug enterprise linux red hat security server websphere
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IBM Business Monitor and DB2 users, not instances
Tue, Aug 26th 2014 10:25a   Dave Hay
So I have been wrestling with IBM Business Monitor and, more specifically, Cognos, which was failing to start up with errors such as DPR-DPR-1035, DPR-CMI-4007, CM-CFG-5063 and CM-CFG-5137. Various Technotes etc. suggested that the problem might be with the DB2 database. I did some digging: - db2 list tables for schema db2user2 db2 connect to cognoscs Database Connection Information Database server = DB2/AIX64 10.1.0 SQL authorization ID = DB2INST3 Local database alias = COGN [read] Keywords: ibm database db2 server sql
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Background Reading - IBM BPM - Process Designer and SSL Goodness
Tue, Aug 26th 2014 5:05a   Dave Hay
Not sure whether this will help me resolve a PD to PC problem on a newly minted BPM Advanced 8.5.0.1 environment, but I'm book-marking these for future reading: - Technote: Trust store problem when connecting from Process Designer to Process Center in IBM Business Process Manager (BPM) Configuring the httpProtocolOnly property for Process Designer Forum Post: Process Designer 8.5.0.1... Process Center : peer not authenticated... For the record, Process Designer has a number of SSL object stores [read] Keywords: admin ibm community




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