In a single node installation, all the Hadoop-YARN daemons (NameNode, ResourceManager, DataNode, and NodeManager) run on a single node as separate Java processes. You will need only one Linux machine with a minimum of 2 GB RAM and 15 GB free disk space.
Before starting with the installation steps, make sure that you prepare the node as specified in the above topic.
127.0.0.1as the IP address. It is known as the loopback address for a machine. You need to make sure that the
/etc/hostsfile contains the resolution for the loopback address. The loopback entry will look like this: