Maybe the default 2048 bit rsa key is better?Vogt 01:54, 31 August 2008 (EDT)
Sometimes the 'ssh-add' is not enough to log in without a password. It is possible that ssh is configured in such way that only a limited group of users is allowed to the machine. In this case - you need root-access to the server! - you have to change the configuration-file. Mostly you can find it as /etc/ssh/sshd_config. If the last line(s) of this file read(s): 'AllowUsers <username>', you will have to add a similar line with your own username. Don't forget to restart the ssh deamon: '/etc/init.d/sshd restart'.
Using pam_ssh module
I just want to add that one could also use the pam_ss module, available here http://pam-ssh.sourceforge.net/ or in the AUR to decrypt the ssh key on login and automatically start ssh-agent and add the keys. This way one would have a truely password less ssh session and in the same way not compromise security by using a passphrase less key.
The current wiki entries tells to "$ echo 'eval `ssh-agent`' >> ~/.bashrc" which will everytime spawn a new ssh-agent. I think a more elegant way is only to add the export commands of ssh-agent to the .bashrc, so one ssh-agent can be used from every shell. This could be put in a small wrapper script:
#!/bin/sh # check if ssh-agent is running if [ -n "`ps -e|grep ssh-agent`" ];then echo "ssh-agent is already running" >&2 exit 1 fi # get new sock and pid agent=`ssh-agent |head -2` # delete old sock, pid and comment sed -i -e "/SSH_\(AUTH_SOCK\|AGENT_PID\)/d" ~/.bashrc # insert new sock and pid for new shells echo -e "# auto generated SSH_AUTH_SOCK and SSH_AGENT_PID" >> ~/.bashrc echo $agent >> ~/.bashrc # for evaluation in the current shell echo $agent
$ eval `./ssh_agent_wrapper.sh` "
this would make ssh-agent available on the current and all new shells.
Be sure you have added the key to your /etc/ssh/ssh_config:
Alternative to manual key installation
We might want to mention that there's a script called 'ssh-copy-id' which comes with OpenSSH that install your public key in a remote machine's authorized_keys. There's a few caveat with it (it changes permissions of the user home directory, which should be a no-op in most situations; see the man page of ssh-copy-id -- and it also tells the user to make sure the script hasn't added extra keys, which might be a bit confusing for some).