lk/networking/ssh.md

title	tags
ssh	networking

Basic ssh

Try out basic ssh by accessing git.charm.sh, without needing authentication:

ssh git.charm.sh

Start an ssh server to try it out. The ssh server is sometimes in a package called openssh, and sometimes only in openssh-server.

Once it's installed, check it's working:

sudo systemctl status ssh

If that doesn't work, the service may be called sshd.

sudo systemctl status sshd

Then start that service:

sudo systemctl start sshd

Test it works by using ssh into your own system, from inside:

ssh $USER@localhost

Access the computer from another computer on the same local network by finding your computer's IP address.

ip address | grep inet

Here is mine:

inet 127.0.0.1/8 scope host lo

inet6 ::1/128 scope host noprefixroute

inet 192.168.0.12/24 brd 192.168.0.255 scope global dynamic noprefixroute en

The first one starts 127, which means it returns back to that computer (like localhost). The second is an ipv6 address, which is too angelic for this world, and has yet to ascend. The third will work from a remote computer.

ssh $USERNAME@IP_ADDRESS

Once you have that, generate some ssh keys:

ssh-keygen

Look at your keys:

ls ~/.ssh

You can share the one ending in .pub freely. The other is secret.

Now send those keys to a remote computer:

ssh-copy-id $USERNAME@IP_ADDRESS

Now you can log in without a password.