SUNScholar/Prepare Ubuntu/S08

Step 8.1 Java environment settings for Tomcat webapp server

To setup the environment variables for Tomcat java web applications, type the following:

nano /etc/default/tomcat6

Check the following for comparison:

# You may pass JVM startup parameters to Java here. If unset, the default
# options (-Djava.awt.headless=true -Xmx128m) will be used.
#JAVA_OPTS="-Djava.awt.headless=true -Xmx128m"
JAVA_OPTS="-Djava.awt.headless=true -Xms1024m -Xmx2048m -XX:MaxPermSize=1024m"

Java environment settings used for SUNScholar

Your settings will depend on how much RAM you have available to assign to the Tomcat server. See graph below as well.

JAVA_OPTS="-Djava.awt.headless=true -Xmx8192m -Xms4096m -XX:PermSize=4096m -XX:MaxPermSize=8192m"

Graph of RAM memory usage on SUNScholar.

Step 8.2 Java environment settings for other java web applications

To setup the environment variables for other java applications (such as the Handle and SOLR servers), type the following:

nano /etc/environment

Copy and paste the following to the bottom of the file.

JAVA_HOME="/usr/lib/jvm/java-6-sun"
JAVA_OPTS="-Djava.awt.headless=true -Xmx1024m -Xms512m"

Step 8.3 Increase number of open files available

Open the following file as follows:

nano /etc/security/limits.conf

Add the following to the bottom of the file:

 *            hard       nofile          65536
 *            soft       nofile          65536

Save the file. Make sure to check the files open parameter with the next computer reboot by typing the following:

ulimit -n

 Proceed to the next step