This document provides instructions for installing Hadoop 2.2.0 on a 3 node cluster of Ubuntu virtual machines. It describes setting up hostnames and SSH access between nodes, installing Java and Hadoop, and configuring Hadoop for a multi-node setup with one node as the name node and secondary name node, and the other two nodes as data nodes and node managers. Finally it explains starting up the HDFS and YARN services and verifying the cluster setup.