Openssh

Authenticate by Key without Password

http://www.linuxproblem.org/art_9.html

Generate keys on user computer:

ssh-keygen -t rsa

Put public key on user B's trusted keys at server

1. cd
2. mkdir .ssh
3. touch .ssh/authorized_keys
4. chmod 700 .ssh
5. chmod 640 .ssh/authorized_keys
6. add some entries to ~/.ssh/authorized_keys
7. also make sure /home/userB has 755

Slow SSH connection

Reason 1: stupid DNS, see http://www.turnkeylinux.org/blog/slow-ssh

Solution: edit /etc/sshd/sshd_config and add 'UseDNS no', or edit /etc/hosts

Reason 2: some GSS API authentication uses DNS, turn it off

Solution: edit /etc/sshd/sshd_config and set "GSSAPIAuthentication no"