1 . On the client run the following commands: 

 2 . $ mkdir -p $HOME/.ssh 
 3 . $ chmod  0700  $HOME/.ssh 
 4 . $ ssh-keygen -t dsa -f $HOME/.ssh/id_dsa -P '' 

This should result in two files, $HOME/.ssh/id_dsa (private key) and 
$HOME/.ssh/id_dsa.pub (public key). 

 5 . Copy $HOME/.ssh/id_dsa.pub to the server. 

 6 . On the server run the following commands: 

 7 . $ cat id_dsa.pub >> $HOME/.ssh/authorized_keys2 
 8 . $ chmod  0600  $HOME/.ssh/authorized_keys2 

Depending on the version of OpenSSH the following commands may also be 
required: 

$ cat id_dsa.pub >> $HOME/.ssh/authorized_keys 
$ chmod  0600  $HOME/.ssh/authorized_keys 

An alternative is to create a link from authorized_keys2 to authorized_keys: 

$ cd $HOME/.ssh && ln -s authorized_keys2 authorized_keys 

 9 . On the client test the results by ssh'ing to the server: 

 10 . $ ssh -i $HOME/.ssh/id_dsa server 

 11 . (Optional) Add the following $HOME/.ssh/config on the client: 

 12 . Host server 
 13 . IdentityFile ~/.ssh/id_dsa

[root@eedb01 ~]# ls -la /root
total  30 
drwxr-xr-x    4  root     root          512  Feb  11   15 : 24  .
drwxr-xr-x   21  root     root          512  Sep  12   09 : 27  ..
-rw-------   1 root     root         104 Feb  6  2007 .Xauthority
-rw-------   1 root     root        7885 Feb 11 15:56 .bash_history
-rw-r--r--   1 root     root         196 Jan  8  2007 .profile
drwx------   2 root     root         512 Feb 11 15:50 .ssh
drwx------   3 root     root         512 Jan  8  2007 .sunw
-rw-r--r--   1 root     root         604 Feb 11 15:24 id_dsa.pub
[root@eedb01 ~]#

[root@sunsol249 ~]# ssh -v  192 . 168 . 10 . 20 
Sun_SSH_1. 1 , SSH protocols  1 . 5 / 2 . 0 , OpenSSL 0x0090704f
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Rhosts Authentication disabled, originating port will not be trusted.
debug1: ssh_connect: needpriv  0 
debug1: Connecting to  192 . 168 . 10 . 20  [ 192 . 168 . 10 . 20 ] port  22 .
debug1: Connection established.
debug1: identity file /root/.ssh/identity type - 1 
debug1: identity file /root/.ssh/id_rsa type - 1 
debug1: identity file /root/.ssh/id_dsa type  2 
debug1: Remote protocol version  2 . 0 , remote software version Sun_SSH_1. 1 
debug1: no match: Sun_SSH_1. 1 
debug1: Enabling compatibility mode for protocol  2 . 0 
debug1: Local version string SSH- 2 . 0 -Sun_SSH_1. 1 
debug1: Failed to acquire GSS-API credentials for any mechanisms (No credentials were supplied, or the credentials were unavailable or inaccessible
Unknown code  0 
)
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-md5 none
debug1: kex: client->server aes128-ctr hmac-md5 none
debug1: Peer sent proposed langtags, ctos: i-default
debug1: Peer sent proposed langtags, stoc: i-default
debug1: We proposed langtags, ctos: en-CA
debug1: We proposed langtags, stoc: en-CA
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug1: dh_gen_key: priv key bits set:  125 / 256 
debug1: bits set:  1567 / 3191 
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Host '192.168.10.20' is known and matches the RSA host key.
debug1: Found key in /root/.ssh/known_hosts: 6 
debug1: bits set:  1609 / 3191 
debug1: ssh_rsa_verify: signature correct
debug1: newkeys: mode  1 
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: newkeys: mode  0 
debug1: SSH2_MSG_NEWKEYS received
debug1: done: ssh_kex2.
debug1: send SSH2_MSG_SERVICE_REQUEST
debug1: got SSH2_MSG_SERVICE_ACCEPT
debug1: Authentications that can continue: gssapi-keyex,gssapi-with-mic,publickey,password,keyboard-interactive
debug1: Next authentication method: gssapi-keyex
debug1: Next authentication method: gssapi-with-mic
debug1: Failed to acquire GSS-API credentials for any mechanisms (No credentials were supplied, or the credentials were unavailable or inaccessible
Unknown code  0 
)
debug1: Next authentication method: publickey
debug1: Trying private key: /root/.ssh/identity
debug1: Trying private key: /root/.ssh/id_rsa
debug1: Trying public key: /root/.ssh/id_dsa
debug1: Authentications that can continue: gssapi-keyex,gssapi-with-mic,publickey,password,keyboard-interactive
debug1: Next authentication method: keyboard-interactive
Password: