#ssh-keygen -t dsa

Above command will generate authentication keys for ssh in our home directory. For password less login we need ‘id_dsa.pub’ file. Now we have to transfer this key to our server where we have to enable public key authentication. ssh-copy-id is best friend to copy that key to our server’s ~.ssh/authorized_keys file.

#ssh-copy-id -i /root/.ssh/id_dsa.pub person@CREATIVEDESKDESK

After giving password it will copy those key to our server. That’s it, you have enable your password less login from your Linux
Laptop/Desktop to your server. Just ssh to our server to see the magic.

#ssh person@CREATIVEDESKDESK

If you want to know other way to do this, i will recomend to visit [1] befor going further.

[1] http://www.biostat.jhsph.edu/bit/nopassword.html

Now my magic will start from here. For example, one often needs to log in to servers CREATIVEDESK, red, green, blue.

1. create a simple script called ‘ssh-to-server’ and put it in
/usr/local/sbin:

      #! /bin/bash

     ssh `basename $0` $*

2. create symlinks with names of the servers:

      # cd /usr/local/sbin

     # chmod 0755 ssh-to-server

     # ln -s ssh-to-server CREATIVEDESK

     # ln -s ssh-to-server red

     # ln -s ssh-to-server green

     # ln -s ssh-to-server blue

Then (if your path includes /usr/local/sbin) one can simply ssh to ‘CREATIVEDESK’ server by typing ‘CREATIVEDESK’ (or run a command on the ‘CREATIVEDESK’ server by ‘CREATIVEDESK uptime’). If the servers need to be accessed by fully qualified domain name, symbolic link to the ssh-to-server script to the FQDN.

Examples,

1. Server’s uptime

#CREATIVEDESK uptime
 18:34:28 up 62 days, 22:49,  2 users,  load average: 0.12, 0.05, 0.01

2. Copy sinlge or multiple file with or without archive

Transfering Single file:

# cat foo | CREATIVEDESK cat > foo

Transfering Multiple files with archive in desire remote location:

#tar -c -f - bar | CREATIVEDESK "cd /tmp; tar -x -f -"

You can find lot SSH Tips and Tricks on the internet. I have a good reference for you.

That’s all for now…