The Hadoop-YARN single node installation

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.

Prerequisites

Before starting with the installation steps, make sure that you prepare the node as specified in the above topic.

• The hostname used in the single node installation is localhost with 127.0.0.1 as the IP address. It is known as the loopback address for a machine. You need to make sure that the /etc/hosts file contains the resolution for the loopback address. The loopback entry will look like this:

  127.0.0.1    localhost
  

• The passwordless SSH is configured for localhost. To ensure this, execute the following command:

  ssh-copy-id localhost
  

Installation steps

After preparing your node for Hadoop, you need to follow a simple five-step process to install and run Hadoop on your Linux machine.

Step 1...