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.
The hostname used in the single node installation is
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: