All, I always run iptables on my systems. Most of the hadoop setup guides I have found skip iptables/firewall configuration. My namenode and task tracker are the same node. My current configuration is not working as I submit jobs from the namenode jobs are kicked off on the slave nodes but they fail. I suspect I do not have the right ports open, but it might be more complex, such as an RPC issue.
I uploaded my iptables file to my pastebin. This way I do not have to inline it. http://paste.jointhegrid.com/10 I want to avoid writing a catch all rule, or shutting down entirely. I would like to have 1-3 configurations in the end for each hadoop component. It anyone helps me out I will contribute this to the hadoop wiki.
