07-05-2012
Creating the key:
The following command was run on both servers and on the local client in separate terminals.
ssh-keygen -t dsa
I pressed enter three times to create the files .ssh/id_dsa and .ssh/id_dsa.pub. I then performed the following command on both servers.
scp .ssh/id_dsa.pub [user@hostname]:.
I entered my password for the scp command and copied the key from each server onto the other.
cat id_dsa.pub >> .ssh/authorized_keys
This installed the key on the servers.
Next, I copied the key from my local client onto both servers and installed them in the same way. Finally, I performed the following commands for each server on the local client:
scp [user@hostname]:.ssh/id_dsa.pub . ; cat id_dsa.pub >> authorized_keys
All machines are authorized to view and copy files on one another. The local client is able to share files between both servers with no password input. One server is able to copy files from the other with no password input. However, the second server is unable to copy files from the first without password input. And when I do enter the password, it breaks the operation.
EDIT: I'm a complete newbie. What do you mean by "must be 755" or "must be 700"?
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LEARN ABOUT DEBIAN
ssh-copy-id
SSH-COPY-ID(1) General Commands Manual SSH-COPY-ID(1)
NAME
ssh-copy-id - install your public key in a remote machine's authorized_keys
SYNOPSIS
ssh-copy-id [-i [identity_file]] [user@]machine
DESCRIPTION
ssh-copy-id is a script that uses ssh to log into a remote machine and append the indicated identity file to that machine's ~/.ssh/autho-
rized_keys file.
If the -i option is given then the identity file (defaults to ~/.ssh/id_rsa.pub) is used, regardless of whether there are any keys in your
ssh-agent. Otherwise, if this:
ssh-add -L
provides any output, it uses that in preference to the identity file.
If the -i option is used, or the ssh-add produced no output, then it uses the contents of the identity file. Once it has one or more fin-
gerprints (by whatever means) it uses ssh to append them to ~/.ssh/authorized_keys on the remote machine (creating the file, and directory,
if necessary.)
NOTES
This program does not modify the permissions of any pre-existing files or directories. Therefore, if the remote sshd has StrictModes set in
its configuration, then the user's home, ~/.ssh folder, and ~/.ssh/authorized_keys file may need to have group writability disabled manu-
ally, e.g. via
chmod go-w ~ ~/.ssh ~/.ssh/authorized_keys
on the remote machine.
SEE ALSO
ssh(1), ssh-agent(1), sshd(8)
OpenSSH 14 November 1999 SSH-COPY-ID(1)