For Installing Datastax Community follow this instruction set
And for Datastax Enterprise, simply follow this
Question
Hi I'm a Java programmer and new to Cassandra, as per my project requirement I need to install in Ubuntu machine and start playing with it. By reviewing lot of websites I got a conclusion that, to setup Cassandra need to install cassandra, Datastax Enterprise and community and Opscenter. But I don't know which s/w need to install first and what is the configuration I need to do with that. So please some one can guide me directly or please suggest me good websites for simple procedure into setup Cassandra in Ubuntu machine.