Hadoop SSH Key Authentication Setup

In Hadoop, user authentication for login can be achieved by configuring SSH keys. Here are the configuration steps:

1. Generate key pair: Run the following command on the host machine of the user you want to use.

ssh-keygen -t rsa

Following the prompts, the generated key pair will be stored in the user’s home directory in the .ssh folder as id_rsa and id_rsa.pub.

1. keys that have been given permission
2. public key file
3. key authorization

cat id_rsa.pub >> ~/.ssh/authorized_keys

1. Secure Shell (SSH)

ssh user@hadoop-node

1. Set up Hadoop services by adding or modifying the following configuration settings in the Hadoop configuration files to enable SSH key authentication for login.

Add the following in core-site.xml:

<property>
  <name>hadoop.security.authentication</name>
  <value>publickey</value>
</property>

Add the following to the hdfs-site.xml:

<property>
  <name>dfs.block.access.token.enable</name>
  <value>true</value>
</property>

1. Restarting the Hadoop service: Restarting the Hadoop service to activate the configurations.

sbin/stop-all.sh
sbin/start-all.sh

Now you can login to the Hadoop cluster nodes using SSH key authentication.