ssh without password on Ubuntu Jaunty

Mostly lifted from here but for my own notes.

On client, run
```
ssh-keygen
```
Do not supply a passphrase. This creates a keypair in ~/.ssh.
Copy the newly created file id_rsa.pub to server.
```
scp -P 22 .ssh/id_rsa.pub bob@server:~/
```
On server, append id_rsa.pub to file ~/.ssh/authorized_hosts (or create if does not exist).
```
cat id_rsa.pub >> .ssh/authorized_hosts
```
(Important) On server, in /etc/ssh/sshd_config change "StrictModes yes" to "StrictModes no".
Restart sshd.
```
sudo /etc/init.d/ssh restart
```
On client, try logging in:
```
ssh -p 22 bob@server
```