SSH User redhat

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Start with creating a user:

useradd -m -d /home/username -s /bin/bash username

Create a key pair from the client which you will use to ssh from:

ssh-keygen -t dsa

Copy the public key /home/username/.ssh/id_dsa.pub onto the RedHat host into /home/username/.ssh/authorized_keys

Set correct permissions on the files on the RedHat host:

chown -R username:username /home/username/.ssh
chmod 700 /home/username/.ssh
chmod 600 /home/username/.ssh/authorized_keys

Ensure that Public Key authentication is enabled on the RedHat host:

grep  PubkeyAuthentication /etc/ssh/sshd_config
#should output:
PubkeyAuthentication yes

If not, change that directive to yes and restart the sshd service on the RedHat host.