Running Oracle Weblogic Server on Linux ? Did you check Entropy


WebLogic Server

This post covers performance issue (Admin Console taking ages while accessing) and is must read if you are running WebLogic Server on Linux.

We encountered this issue while managing Fusion Middleware (with WebLogic) for one of our customer where accessing Admin Console was very Slow and there were no errors in log (memory and CPU were just fine).

A Brief decsription about Entropy on linux Platform:

An Operating System performs cryptographic operations at every time (on ssh challenges, https connections, etc.) .
Linux has two devices to provide random data at any time: /dev/random and /dev/urandom so the /dev/random pool gets consumed quite fast with the cryptographic operations. This pool also gets consumed while performing I/O operations, mouse,keyboard etc. and since, the Java uses /dev/random by default as entropy generator device that runs out of random bits and Therefore, makes us waiting for more time.

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Cause:

After starting the WebLogic server instance the available Entropy on the system was substantially decreasing.

Check the default system entropy using the command below:
# cat /proc/sys/kernel/random/poolsize
4096

Check the available entropy using th command below:
# cat /proc/sys/kernel/random/entropy_avail
125

Solution:

1. Temporary Fix:

a. Override the JAVA_OPTIONS environment variable before starting WebLogic Server via shell scripts (./startWeblogic.sh)

export JAVA_OPTIONS=”${JAVA_OPTIONS} -Djava.security.egd=file:/dev/./urandom”

b. Start Weblogic server instance
./startWeblogic.sh

 

2. Permanent Fix:

a. Edit the Java Security Properties file located in $JAVA_HOME/jre/lib/security/java.security and change the securerandom.source property which points to /dev/random (by default). set it as:

securerandom.source=file:/dev/./urandom

b. Save the changes and Start WebLogic server

 

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About the Author Atul Kumar

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