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On Thu, 27 Sep 2001, Kasper (Swebase) wrote:
>
> Is there any solution to crontab an scp.
>
> So the copying is done automaticly with autologin and so on.
> I want to make a crontab thats copying files every night.
Yes - one way to do this is to use the ssh-agent to store your
keys for a client program to make use of. This technique is described in the
O'Reilly book "SSH The Secure Shell - The Definitive Guide".
I am assuming that you want to run the client as a non-privileged user.
The first thing you ned to do is start the ssh-agent. Create a script
to kill any running agents owned by you and start a fresh one:
#!/bin/sh
for i in `ps aux | grep $USER | grep ssh-agent | awk '{ print $2 }'`
do
kill -9 $i
done
ssh-agent | head -2 > ~/ssh-agent.dat
chmod 700 ~/ssh-agent.dat
. ~/ssh-agent.dat
This will start an agent, and create output defining two environment variables,
SSH2_AUTH_SOCK and SSH2_AGENT_PID. These variables are required to enable
clients to find the agent and it's socket. The output of the ssh-agent command
is in a form which can be saved to a file and run as a script. By running the
script, the two environment variables are set and exported. Do a "man ssh-agent"
for details.
(If you want, you can do this in a login script such as .bash_profile.
Just make sure the script only runs once, when you login & not
during startup of an X session.)
Then, you need to add your keys to the agent. Do this from the command
line with the ssh-add command. You will be prompted for your passphrase,
which will be stored until you kill the agent or reboot. You can use your
personal key, or add a special key just for the backup, since the
ssh-agent can hold more than one identity.
Now you can create a cron task for yourself, which runs the scp command from
another script:
#!/bin/sh
. ~/ssh-agent.dat
. ~/scp -q -o 'Batch_Mode yes' <source-file> <remote_host>:/<target>
This works for me, YMMV. I'm sure that there are other ways, too.
Also, be very careful about permissions on script files.
Matt
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