[Beowulf] Passwordless ssh - strange problem

James Bardin jbardin at bu.edu
Fri Sep 14 13:44:44 EDT 2007


If you've copied your publickey to the server already (`ssh-copy-id` 
will add it to the authorized_keys file fro you), and the permissions 
are correct, I can't think of anything else to try without looking at 
the server.

The sshd logs should shed some light, and make sure that sshd_config has 
"PubkeyAuthentication yes"

-jim


laytonjb at charter.net wrote:
> James,
>
> I'm not an ssh expert and I don't play one on TV and I can't get the logs to
> this system where I'm emailing so I will have to type in here.
>
> ...
> debug1: Authentications that can continue: publickey,gssapi-with-mic,password
> debug1: Next authentication method: publickey
> debug1: Trying private key: /home/panasas/.ssh/identity
> debug1: Offering public key: /home/panasas/.ssh/id_rsa
> debug1: Authentications that can continue: publickey,gssapi-with-mic,password
> debug1: Trying private key: /home/panasas/.ssh/id_dsa
> debug1: Next authentication method: password
> <prompts me for my password>
>
> So it looks like it doesn't like my id_rsa key? Should I also create a dsa key
> combination and add the public to authorized_keys.
>
> Thanks!
>
> Jeff
>
>  Bardin <jbardin at bu.edu> wrote: 
>   
>> Hi Jeff,
>>
>> Did you specify the key on the command line (-i .ssh/id_rsa), or load it 
>> into an agent with shh-add?
>>
>> You can make sure you're sending the key by increasing the verbosity 
>> (-v), and check the logs on the clients. sshd will log why it rejected a 
>> key for authentication.
>>
>> The permissions should be 600
>>
>> -jim
>>
>> laytonjb at charter.net wrote:
>>     
>>> Afternoon cluster party goers,
>>>
>>> I'm having trouble on a cluster with passwordless ssh. I followed all the
>>> steps (I think). On the head node, I generated the public and private
>>> keys and then copied id_rsa.pub to authorized keys. Then I tried
>>> logging into compute nodes and it asks for my password every time
>>> (regardless of the number of times I log into the node). I've tried changing
>>> the permissions on authorized_keys a few times (600, 644) and that
>>> doesn't seem to change the behavior. Any ideas?
>>>
>>> Thanks!
>>>
>>> Jeff
>>>
>>> _______________________________________________
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>>>
>>>   
>>>       
>> -- 
>>
>> /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
>> James Bardin - Systems Analyst / Administrator I
>> Boston University Department of Electrical and Computer Engineering
>> 8 Saint Mary's St, Room 305, Boston, MA 02215
>> Ph:617-358-2785         http://www.bu.edu/ece/it
>> * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
>>
>>     
>
>
>   

-- 

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
James Bardin - Systems Analyst / Administrator I
Boston University Department of Electrical and Computer Engineering
8 Saint Mary's St, Room 305, Boston, MA 02215
Ph:617-358-2785         http://www.bu.edu/ece/it
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

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