Passing file between Pi(s)

[solo2500]

I want to use

Code: Select all

 scp localfilename username@otherRapsberryIpAddress:remotefilename  

in a cron job. Is there a way to pass along the password?

[rpdom]

Use passwordless ssh using keys. Generate a public/private RSA key pair on the local Pi. Copy the public key to the remote pi in /home/username/.ssh/authorized_keys. Now ssh and scp will work between those two without asking for a password. There are instructions somewhere on the Pi website on how to set this up. Ah, here they are https://www.raspberrypi.org/documentati ... ordless.md

[jahboater]

You can copy the keys around with ssh-copy-id
In fact all you need is (hit return for all the questions) :-

ssh-keygen
ssh-copy-id username@remotepi

[solo2500]

Thanks all! It works!
However I can't use it (scp) in a cron job? I can't even use cron to call a shell scrip (which uses scp.)
Does anyone know a work-around?

THANKS!

[rpdom]

How are you setting up the cron job? Do you use sudo crontab or just crontab?

[solo2500]

How are you setting up the cron job? Do you use sudo crontab or just crontab?

sudo

The error I get is "Host key verification failed." HOWEVER... if I run it in a terminal window it works fine and passes the file without error.

[DirkS]

How are you setting up the cron job? Do you use sudo crontab or just crontab?

sudo

The error I get is "Host key verification failed." HOWEVER... if I run it in a terminal window it works fine and passes the file without error.

Looks like you added the keys for user 'pi'. If you run scp from the command line without 'sudo' then all is fine.

If you use it from the 'root' crontab then scp will also run as root.
You have to make sure that the keys are created for the correct user (pi and/or root)

[rpdom]

Delete the entry from sudo crontab and put the same entry in crontab without the sudo.

Those two commands edit different crontabs. sudo edits the root user's crontab. No sudo edit the pi user's crontab. You want to run as "pi".

[solo2500]

How are you setting up the cron job? Do you use sudo crontab or just crontab?

sudo

The error I get is "Host key verification failed." HOWEVER... if I run it in a terminal window it works fine and passes the file without error.

Looks like you added the keys for user 'pi'. If you run scp from the command line without 'sudo' then all is fine.

If you use it from the 'root' crontab then scp will also run as root.
You have to make sure that the keys are created for the correct user (pi and/or root)

YES!!! Thats it!
THANK YOU!!!