Why the sshd service is unrecognized?

In Ubuntu, install sshd client and server with these commands:

sudo apt-get install openssh-client

and

sudo apt-get install openssh-server

Then, to restart sshd, type:

sudo /etc/init.d/ssh restart

This worked for me, when I had the same problem. You can find more information here.

hadoop ssh sshd

Try these commands:

For Debian/Ubuntu

/etc/init.d/sshd restart

For RedHat and Fedora Core Linux

/sbin/service sshd restart

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