You should be able to login with ssh using the user which starts the hadoop daemons.
Enable host based authentication and disable password authentication in
/etc/ssh/sshd_config as root.
# For this to work you will also need host keys in /etc/ssh/ssh_known_hosts. #RhostsRSAAuthentication no # similar for protocol version 2 # Enabled for HADOOP HostbasedAuthentication yes
# To disable tunneled clear text passwords, change to no here! #PasswordAuthentication yes #PermitEmptyPasswords no # Disabled for HADOOP PasswordAuthentication no
Tail the secure logs as root in a seperate terminal session.
tail -f /var/log/secure
Following the hadoop setup guide you create a private and public keys.
ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa
And append them into the authorized keys file.
cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys
If you try to login using
ssh localhost and ssh is asking for a password the files could not be read by ssh. The logs should tell you something like
Authentication refused: bad ownership or modes for file ~/.ssh/authorized_keys
You have to change the modes using:
chmod 700 ~/.ssh
chmod 600 ~/.ssh/authorized_keys
After changing that, you should be able to login without using your credentials.