Common Issues & Troubleshooting in Weblogic

1 – OOM issues Young Generation : It is place where lived for short period and divided into two spaces: Eden Space : When object created using new keyword memory allocated on this space.   Survivor Space : This is the pool which contains objects which have survived after java garbage collection from Eden space. […]

Running a Command on Multiple servers using Free Fanout Utility

Fanout is a nifty tool for sysadmins to quickly run a set of commands on multiple servers:

It runs non-interactive commands (like ddcatadduseruname -a, etc.) and pipelines built of these. The output is collected into a single display that can be viewed by less or redirected to a file

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Take remote GUI of Solaris or Linux Machine with Free and Open Source xMing

This is a frequent requirement when you want to run some program which has a GUI on remote Linux machine , you will get an error because it can’t display the GUI window on your ssh terminal Read more about Take remote GUI of Solaris or Linux Machine with Free and Open Source xMing

Redirection in Unix/Linux

Redirection is a very important concept in Unix, it is quite helpful when you setup cron or schedule the scripts, it helps you in redirection output from std device like screen to some file which can be beneficial if script is running in the background without user interference. Any person can later check the output […]

Heartbleed Bug affecting Weblogic websphere apache & other middleware application / web servers ?

So we all are hearing various news about Heartbleed Bug, so let’s see which of our middleware application servers are affected by this:

Here is an brief review of the Bug -CVE-2014-0160:

“OpenSSL could allow a remote attacker to obtain sensitive information, caused by an error in the TLS/DTLS heartbeat functionality. An attacker could exploit this vulnerability to expose 64k of private memory and retrieve secret keys. An attacker can repeatedly expose additional 64k chunks of memory. This vulnerability can be remotely exploited, authentication is not required and the exploit is not complex. An exploit can only partially affect the confidentially, but not integrity or availability..”

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Find which process is using a particular Port (AIX, Linux, Windows)

AIX Command 1. lsof -i :<port number> – This command must be run as root. lsof executable is available here. https://www14.software.ibm.com/webapp/iwm/web/reg/pick.do?source=aixbp&lang=en_US AIX Example Let’s set SVCENAME to 50000, so that the listener will use this port. $ db2 update dbm cfg using svcename 50000 $ db2start Then, use the command above to check if the […]