Local -> Remote (no passwd login)

1. Key generating

- Local server home directory $> ssh-keygen -t dsa    <enter>

Show message

Generating public/private dsa key pair.
Enter file in which to save the key (/home/hadoop/.ssh/id_dsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:

<all enter>

The key fingerprint is:
34:23:12:e5:d3:53:323:34......................................  user_name@hostname


2. Brings Local server created key from  remote server.
Remote server home directory $> scp user_name@hostname:~/.ssh/id_dsa.pub .ssh/authorized_keys
user_name@hostname server's password input and enter.


3. from remote server to Local server ssh login
ssh user_name@hostname   <enter>
if no problem then no password login, success.


4. if failed then to do.
remote server directory privilege
1) if home directory name is "hadoop" then chmod 755 hadoop   <enter>
2) .ssh directory privilege is 700
3) authorized_keys file privilege is 644

and

try sshd config change

vi /etc/ssh/sshd_config  <enter>

 - change list -

1> StrictModes no
2> RSAAuthentication yes
3> PubkeyAuthentication yes
4> AuthorizedKeysFile    .ssh/authorized_keys

<save & exit>

/etc/init.d/sshd restart     <enter>


try ssh login