SSH

SSH Setup

Goal: Set up an ssh connection from A to B.

On machine B (the receiving maching)

# get ip addr
$ ip -4 addr

# (optional) start ssh server
$ sudo systemctl start sshd.service

Move to machine A.

With the username, ip address (and the login password on the receiving machine) we can ssh into it.

# test ssh connection
$ ssh <username>@<ip-addr>

and enter the login password.

Now set up ssh keys to make authentication password free and secure.

# setup key authentication
$ ssh-keygen -t rsa
$ ssh-copy-id -i ~/.ssh/id_rsa.pub <username>@<ip-addr>

# setup ssh config
$ nano ~/.ssh/config

and add the following:

Host <host>
HostName <ip-addr>
User <username>

Enjoy safe, easy ssh-ing, e.g.

$ ssh amin@fractal

If you get an error ssh returns “Bad owner or permissions on ~/.ssh/config” it means you don't have the right permissions set on ~/.ssh/config. Do

$ chmod 600 ~/.ssh/config