SSH login without specifying a password

published by ericdes on Wed, 01/26/2011 - 11:13

You sometimes want to have a shell script automatically log on to another server, e.g. for transferring files. Sharing a key is the way to go.

First, you have to create a key”

cd ~
ssh-keygen -t rsa

I usually answer with the default value (by typing on all questions).

Send this key to the computers you want to connect to without a password (in this example, you’ll want to connect to the remote computer as the user ‘root’):

export computer=server1.example.com
cat ~/.ssh/id_rsa.pub | ssh $computer ‘cat >> /root/.ssh/authorized_keys’

Verify you can ssh without entering a password:

ssh $computer

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