[vox-tech] crontab and scp puzzle

[Michael Wenk]

Oops, I should have said -n not -N.

Sorry.  Not sure its valid for scp tho.  Looks like -q is, but the
programs are somewhat interwoven, so who knows.

Mike

On Wed, Mar 16, 2011 at 1:13 PM, Michael Wenk <mjwenk at ucdavis.edu> wrote:
> It is looking for an open tty and is failing because cron does not do that.
>
> I don't know much about scp and ttys, but I would try either -N or -q
> and see if that works.  Otherwise see if there's an SSH/SCP option to
> get it to not use a tty.
>
> Mike
>
> On Wed, Mar 16, 2011 at 9:43 AM, Bruce Wolk <bawolk at ucdavis.edu> wrote:
>> I need to copy a file from my server to a workstation on a regular
>> basis.  I have set up passwordless ssh access to the server from my
>> workstation.  When I execute the following on the workstation, the
>> command succeeds and the file is copied:
>>
>> scp -P 33303 bruce at myserver.com:backup/db.sql.gz
>> /home/bruce/backup/db.sql.gz
>>
>> But when I put the same command into a cron file on the workstation, the
>> command fails.  The relevant output from the scp command is:
>>
>> debug1: Found key in /home/bruce/.ssh/known_hosts:5
>> debug1: ssh_rsa_verify: signature correct
>> debug1: SSH2_MSG_NEWKEYS sent
>> debug1: expecting SSH2_MSG_NEWKEYS
>> debug1: SSH2_MSG_NEWKEYS received
>> debug1: Roaming not allowed by server
>> debug1: SSH2_MSG_SERVICE_REQUEST sent
>> debug1: SSH2_MSG_SERVICE_ACCEPT received
>> debug1: Authentications that can continue: publickey
>> debug1: Next authentication method: publickey
>> debug1: Offering public key: /home/bruce/.ssh/id_rsa.pub
>> debug1: Server accepts key: pkalg ssh-rsa blen 279
>> debug1: PEM_read_PrivateKey failed
>> debug1: read PEM private key done: type <unknown>
>> debug1: read_passphrase: can't open /dev/tty: No such device or address
>> debug1: No more authentication methods to try.
>> Permission denied (publickey).
>>
>> I edited the cron file using crontab -e and have verified that it is
>> excecuting properly as user bruce.
>>
>> I googled around but found nothing that helps.  Why would the
>> authentication work with direct execution, but fail with cron execution?
>>  Does anyone have any ideas?
>>
>> Bruce
>> _______________________________________________
>> vox-tech mailing list
>> vox-tech at lists.lugod.org
>> http://lists.lugod.org/mailman/listinfo/vox-tech
>>
>
>
>
> --
> Michael Wenk
> mjwenk at ucdavis.edu
>



-- 
Michael Wenk
mjwenk at ucdavis.edu