how to configure ssh for hadoop standalone installation?

Question

I am trying to install Hadoop in a standalone mode on my Ubuntu local host.

in this activity, I am using following 2 references.

1) https://www.digitalocean.com/community/tutorials/how-to-install-hadoop-in-stand-alone-mode-on-ubuntu-16-04

2) https://www.michael-noll.com/tutorials/running-hadoop-on-ubuntu-linux-single-node-cluster/

now this first reference does not speak about any ssh configuration.I am able to implement these instructions successfully also able to execute given map-reduce program.

however as instructed in a second reference. we need to configure ssh to enable hadoop to access its nodes.

I followed the instructions given on site.

although i am not able to connect to localhost via ssh.

I did a research about the same. https://askubuntu.com/questions/218344/why-am-i-getting-a-port-22-connection-refused-error

upon firing sudo netstat -anp | grep sshd , came to know that sshd is not running.

after more of a googeling, I got a suggestion to install openssh-server, which I tried to do. sudo apt-get install openssh-server

following is the snapshot of error which I got.

my question is why is it not running at my end? Am I following right process? Am I missing any configurations?

thanks, Ash

Answer 1

You don't need to do so much. It is a damn simple process. You want to ssh with the

'localhost' in the standalone setup. Just follow to simple commands.

ssh-keygen

Make sure you press enter on every default setting.

ssh-copy-id -i .ssh/id_rsa.pub localhost

You will be asked for the password once. Enter it and then try ssh with localhost using command

ssh localhost

And you're good to go.