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I want to copy files using scp between two remote hosts with key-based authentication.

scp -i /home/user/.ssh/id_rsa user@host1:/tmp/myfile user@host2:/tmp/

The problem is that the host2 still prompts me for a password, even though I have copied the public key to both servers. Is there a way to make this work?

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    What does it say in the /var/log/secure or /var/log/auth on host2? And what do you mean by 'copied the public key to both servers' did you literary put the id_rsa.pub in host2's .ssh directory (which is wrong) or did you add it to the authorized_keys file in the .ssh directory of host2. – devnull Feb 11 '15 at 1:23
  • Let's say I swaped the hosts and the second one ask me the password. In fact I started using the same host for test. – user2264099 Feb 11 '15 at 1:30
  • I am confused by what you just said, could you elaborate more? – devnull Feb 11 '15 at 1:32
  • Also take a look at this and see if that helps. – devnull Feb 11 '15 at 1:36
  • I mean if I try scp -i /home/user/.ssh/id_rsa user@host2:/tmp/someotherfile user@host1:/tmp/ host1 ask me the password now. Other try is: scp -i /home/user/.ssh/id_rsa user@host1:/tmp/file1 user@host1:/tmp/file1.copy and I have to enter the password one time. I will try using ~/.ssh/config to specify the key for each host. – user2264099 Feb 11 '15 at 1:54
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Do you start from host1 or host2? in which case there is a redundant host_, also if both user are the same, and same from starting host, user@ is redundant.

To sum up, assuming you start from host1

  • copy content of id_rsa.pub to the authorized_keys on host2
  • to fetch remote file (remote to local)

    scp -i /home/user/.ssh/id_rsa host2:/tmp/somedistantfile /tmp
    
  • to send (local to remote )

    scp -i /home/user/.ssh/id_rsa /tmp/somelocalfile host2:/tmp
    
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You can copy directly between the remote machines by using:

ssh -A -t -v user-1@source-host scp /path/to/source/file user-2@dest-host:/path/to/dest/file

This will not use your local machine but will directly copy the file from source-host to dest-host which might be useful for large files.

You should first do ssh-add .ssh/my-private-key or use -i .ssh/my-private-key param in the above command.

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