View source for Ubuntu/Linux/SSH Login Without Password

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=== Step 1: Create public and private keys using ssh-key-gen on local-host ===
<div class="_" style="background:#eee;border:1px solid #ccc;padding:5px 10px;">jsmith@local-host$ <span style="color:#FF0000;">[Note: You are on local-host here]</span></div> <div class="_" style="background:#eee;border:1px solid #ccc;padding:5px 10px;">&nbsp;jsmith@local-host$ '''ssh-keygen'''<br/> Generating public/private rsa key pair.<br/> Enter file in which to save the key (/home/jsmith/.ssh/id_rsa): <span style="color:#FF0000;">[Enter key]</span><br/> Enter passphrase (empty for no passphrase): <span style="color:#FF0000;">[Press enter key]</span><br/> &nbsp;&nbsp;&nbsp; Enter same passphrase again: <span style="color:#FF0000;">[Pess enter key]</span><br/> Your identification has been saved in /home/jsmith/.ssh/id_rsa.<br/> &nbsp; Your public key has been saved in /home/jsmith/.ssh/id_rsa.pub.<br/> The key fingerprint is:<br/> 33:b3:fe:af:95:95:18:11:31:d5:de:96:2f:f2:35:f9&nbsp; jsmith@local-host</div> 
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=== Step 2: Copy the public key to remote-host using ssh-copy-id ===
<div class="_" style="background:#eee;border:1px solid #ccc;padding:5px 10px;">jsmith@local-host$ '''ssh-copy-id -i ~/.ssh/id_rsa.pub remote-host'''<br/> jsmith@remote-host's password:<br/> Now try logging into the machine, with "ssh&nbsp; 'remote-host'", and check in:</div> <div class="_" style="background:#eee;border:1px solid #ccc;padding:5px 10px;">.ssh/authorized_keys</div> <div class="_" style="background:#eee;border:1px solid #ccc;padding:5px 10px;">to make sure we haven't added extra keys that you weren't expecting.</pre></div> <div class="_" style="background:#eee;border:1px solid #ccc;padding:5px 10px;">'''Note:'''&nbsp;ssh-copy-id&nbsp;'''appends'''&nbsp;the keys to the remote-host’s .ssh/authorized_key.</div> </div>

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=== Step 3: Login to remote-host without entering the password ===
<div class="_" style="background:#eee;border:1px solid #ccc;padding:5px 10px;">jsmith@local-host$ '''ssh remote-host'''<br/> Last login: Sun Nov 16 17:22:33 2008 from 192.168.1.2<br/> <span style="color:#FF0000;">[Note: SSH did not ask for password.]</span></div> <div class="_" style="background:#eee;border:1px solid #ccc;padding:5px 10px;">jsmith@remote-host$ <span style="color:#FF0000;">[Note: You are on remote-host here]</span></div> <div class="_" style="background:#eee;border:1px solid #ccc;padding:5px 10px;">jsmith@local-host$ '''ssh-copy-id -i remote-host'''<br/> jsmith@remote-host's password:<br/> Now try logging into the machine, with "ssh 'remote-host'", and check in:<br/> .ssh/authorized_keys</div> <div class="_" style="background:#eee;border:1px solid #ccc;padding:5px 10px;">to make sure we haven't added extra keys that you weren't expecting.<br/> <span style="color:#FF0000;">[Note: This has added the key displayed by ssh-add -L]</span></div> <div style="background:#eee;border:1px solid #ccc;padding:5px 10px;">Step 4: Fire up a text editor and point it to this file:</div> <div class="_" style="background:#eee;border:1px solid #ccc;padding:5px 10px;">~/.ssh/config</div> </div> 
[[File:Config-file.png]]
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