We need a repo before doing anything else
Install package hadoop-client, by default
Create our configuration directory
Rename to hadoop_conf_dir since we will have other configuration directories
Adding update-alternatives
Initial template for all *-site.xml files
Default core-site.xml fs.defaultFS to hdfs://localhost
Apparently, CentOS 6.4 ships and older version than Ubuntu 12.04
Setup core-site.xml