We will learn how to log in quickly to this server, even if the name is quite long.
We can generate a key pair stored on the current machine at
~/.ssh/id_rsa.pub (public, safe to share) and
~/.ssh/id_rsa (private, never share this one).
ssh-keygen -t rsa -b 4096
Just use the defaults by hitting enter.
Then, we append the content of
~/.ssh/authorized_keys on the host machine.
And that’s all! You should be able to
ssh $host without a password!
For passwordless login to subsequent machines, all you need to do is run the
$host is very long to type, or even if it’s short, we can make it shorter by adding the following lines to
## ~/.ssh/config Host wopr User apklinkh Hostname guardian.it.mtu.edu
Now we can type
ssh wopr instead of
Sometimes you want to
ssh to a host that you can only reach from an internal network.
If you have access to a machine on the internal network, some additions to
~/.ssh/config make it possible to
ssh directly to the desired machine.
In this example,
superior is the machine that we want to access, but we must tunnel through
## ~/.ssh/config Host wopr User apklinkh Hostname guardian.it.mtu.edu Host superior User apklinkh Hostname superior-login1.research.mtu.edu ProxyCommand ssh wopr /usr/bin/nc %h %p 2>/dev/null