Hadoop: start-dfs.sh permission denied

Question

I am installing Hadoop on my laptop. SSH works fine, but I cannot start hadoop.

munichong@GrindPad:~$ ssh localhost
Welcome to Ubuntu 12.10 (GNU/Linux 3.5.0         


        

Answer 1

You are trying to ssh to your own machine (localhost) and missing the authorized_keys file which allows login.

This file in SSH specifies the SSH keys that can be used for logging into the user account for which the file is configured.

Follow the below two steps to configure it correctly.

Generate new keygen with the below command in terminal:

ssh-keygen

Press enter so as to retain the default name id_rsa.pub

Now register the generated key file:

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