OT: [solved] scp question

Cameron Simpson cs at zip.com.au
Sat Dec 21 22:22:22 UTC 2013


On 21Dec2013 11:08, Mike Wright <mike.wright at mailinator.com> wrote:
> 12/21/2013 09:00 AM, Mike Wright wrote:
> >I'm trying to automate a box to box backup.
> >
> >When I run the "scp" command from the command line it uses my
> >public/private key pair and everything works well

I would guess: via an ssh-agent?

> >but if I execute the
> >same command from a cron job the receiving end reports, "Failed
> >password...".
> >
> >Why does CLI use keys but the script use passwords?
> >Here is the command:
> >scp -r /home/mike/Backup/mysql 192.168.4.70:/home/mike/Backup
> 
> OK.  For some reason scp needs to be told explicitly which key set
> to use.  This is done using the -i switch:
> 
> scp -r -i /home/mike/.ssh/sql_rsa ...

Only if the key does not have the default name "id_rsa".

Alternatively you can make a .ssh/config clause to specify the name, eg:

Host backups
  Hostname      192.168.4.70
  IdentityFile  ~/.ssh/sql_rsa

Then:

  scp -r -i /home/mike/Backup/mysql backups:/home/mike/Backup

Cheers,
-- 
Cameron Simpson <cs at zip.com.au>

Last month, my alumni/ae association sent out a questionnaire. One of the
questions they asked was my/my household's annual income. The choices were:
(a) Less than $25,000, (b) $25,001-50,000, (c) $50,001-100,000,
(d) $100,001-250,000, (e) $250,001-500,000, (f) $500,001-1,000,000,
(g) $1,000,000 or more. Yeah, right. Nice median.
        - Dan Hillman, dcah100 at cus.cam.ac.uk


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