On Friday 10 October 2003 13:35, Bill Tangren wrote:
MKlinke wrote:
On Thursday 09 October 2003 10:41, Aly Dharshi wrote:
Hello,
So how do you sort out the passwd when ssh asks for one, do you have it in some secret file ?
'ssh-agent' is one option for this..
%eval `ssh-agent` %ssh-add
This will store and apply the key when required.
Regards, Mike Klinke
Mike,
I tried this on both the backup machine, and the machine to be backed up. I still get prompted for a password. Could you (or someone else) provide an example of how you would use this in a script that uses rsync and ssh to backup files from one machine to another? I read the man pages for ssh-agent and ssh-add, and it was not clear to me. The eval function provides ssh-agent's pid, but I'm not sure how to use it in this case.
TIA, Bill
My notes:
Machine A has the batch file that is used to drive rsync. Machine B is the machine to back up.
On machine A create your public/private keys via ssh-keygen Copy the generated public key to Machine B (append the key to the appropriate "authorized_keys2" file)
On machine A run: eval `ssh-agent`
(make sure these are both back-tics `` )
On machine A run: ssh-add (You'll have to re-enter the keyphrase)
On machine A you can now run: ssh <machine_B_IP> (and you should not be asked for a password.)
For batch use change the line for BatchMode in /etc/ssh/ssh_config to: BatchMode yes
You should now be able to run a script containing ssh commands:
(note that the ssh-agent should be only viable for the current login session but that doesn't pose a problem for my use. I have run across a site that where someone created a utility to allow the ssh-agent to be accessible from a cron task or a shell other than the login shell but can't remember it right now.)
Regards, Mike Klinke
Hmmm... not working. This is what I did:
[bjt@mach2 bjt]$ ssh-keygen -t dsa Generating public/private dsa key pair. Enter file in which to save the key (/home/bjt/.ssh/id_dsa): Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /home/bjt/.ssh/id_dsa. Your public key has been saved in /home/bjt/.ssh/id_dsa.pub. [bjt@mach2 bjt]$ cd .ssh [bjt@mach2 .ssh]$ sftp aa Connecting to aa... bjt@aa's password: sftp> cd .ssh sftp> put id_dsa authorized_keys2 Uploading id_dsa to /home/bjt/.ssh/authorized_keys2 sftp> bye [bjt@mach2 .ssh]$ cd [bjt@mach2 bjt]$ eval `ssh-agent` Agent pid 3587 [bjt@mach2 bjt]$ ssh-add Enter passphrase for /home/bjt/.ssh/id_dsa: Identity added: /home/bjt/.ssh/id_dsa (/home/bjt/.ssh/id_dsa) [bjt@mach2 bjt]$ ssh aa bjt@aa's password:
As you can see, it asked for the password.
I'm not sure what the purpose of the "eval `ssh-agent`" does. Does it put my private key in ram?
Bill
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