Hadoop SSH login issues

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.

vi /etc/ssh/sshd_config

# 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.

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About Jan Tschada

Software engineer from Germany
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