How to Install a Cloud Server - Learn to Program with Minecraft Plugins - page 225

Your public key is id_rsa.pub , and you'll need to add that to a file named
~/.ssh/authorized_keys on the server.
To do that, make the .ssh directory on the server first. I'll show the login prompt
on the server as Server$ so you can tell which machine I'm on.
$ ssh [e-mail]
Password:
Welcome to My Awesome Minecraft Server
Last login: Mon Feb 16 12:16:57 from xyzzy-plugh
Server$ mkdir .ssh
Now back on your computer, copy the id_rsa.pub file (or whatever your .pub file
is named) up to the server using scp , putting it in the .ssh directory and
renaming it authorized_keys :
$ scp id_rsa.pub [e-mail]:~/.ssh/authorized_keys
That will copy the file to your .ssh directory under your home (“~”), and name
it authorized_keys . If you want to later, you can add keys from other machines
into this file (that's why “keys” is plural). But for now you just have this one
entry.
Finally, you need to go back on the server and check and fix the file permis-
sions. The .ssh directory should be readable and listable only by you, and the
files inside should be readable by you alone. In most cases, ssh will not work
at all if the file permissions aren't restricted. It's for your own good.
You can set the file permissions using the chmod command:
$ ssh [e-mail]
Password:
Welcome to My Awesome Minecraft Server
Last login: Mon Feb 16 12:26:13 from xyzzy-plugh
Server$ cd .ssh
Server ~/.ssh$ chmod 700 .
Server ~/.ssh$ chmod 600 authorized_keys
Now from your computer, you should be able to ssh or scp without having to
specify a password:
$ ssh [e-mail]
Welcome to My Awesome Minecraft Server
Last login: Mon Feb 16 12:32:07 from xyzzy-plugh
Server$
And we're in!
Your next question may be, “Swell, but how do I get OUT?” Fair enough.