GlassFish Port Permission error

Symptoms

When trying to create a domain, permission warning may appear as follows:

/opt/glassfish3/glassfish/bin/asadmin --user admin --passwordfile /opt/glassfish3/passwordfile create-domain --adminport 4848 --instanceport 8000 myDom1

You do not have permission to use port 4848 for myDom1. Try a different port number or login to a more privileged account.CLI130 Could not create domain, myDom1Command create-domain failed.

Similarly, when starting a domain, the following may be encountered:

There is a process already using the admin port 4848 -- it probably is another instance of a GlassFish server.Command start-domain failed.

Possible solutions

• Ensure port is not in use, check "netstat -an | grep 4848" 
• "ps -ef|grep java" to check if another GF instance is running. Shut it down first.
• Identify 'hostname' 
• Verify that /etc/sysconfig/network has the correct hostname
• Ensure 'hostname' is in /etc/hosts and assigned to the correct IP address, where the server will listen

Linux Kernel Parameters

Excellent collection of available kernel boot parameters including sysctl options is available on Aarom Maxwell's page grouped by kernel versions starting 2.6.12.

kernel.org documentation is also an excellent resource for Linux kernel options.