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Set up a Linux client computer

By Pudge

On a CLIENT LINUX COMPUTER with XFCE or another desktop environment, open a terminal window. Use the static IP address you established for the server and the hostname you decided on. Add the following line to the end of /etc/hosts. This will establish the route to the server. Your info may be different from the example.

$ sudo vi or leafpad /etc/hosts  (add to end of file)  enosServer.localdomain    enosServer

This establishes a relationship between the hostname of enosServer and it’s IP address, kind of like a DNS service. Otherwise, you would have to address the server by it’s IP address and port number, which can be awkward and hard to remember.

Since the SSH port that the enosServer listens on was changed from the default port 22, the Client computer needs to know which port to use.

$ sudo vi or leafpad /etc/ssh/ssh_config 

(change the following line.)
FROM #Port 22
TO Port 9XXX
(Use the same port # as in the server)

Configure the firewall

If you already have a firewall installed, or you don’t want a firewall, skip this section.

$ su                (Then enter your root password)
# pacman -S gufw    (install ufw firewall)
# ufw status        (check status of ufw)
Status: inactive
# ufw logging off   
(otherwise logging appears on screen & makes a mess of DMESG)
# ufw default deny
( denies all incoming UNSOLICITED traffic, solicited traffic passes)
# ufw enable
# systemctl enable ufw.service
# systemctl start ufw.service
# systemctl reboot
(then log back in as user)
$ sudo ufw status
Status: active

Connect to enosServer with SSH

In a terminal window, as a user try to connect to enosServer

$ ssh pshare@enosServer
(if you happen to be at root, dont try to SSH as root)

If you successfully communicated with enosServer, you will get something similar to:

The authenticity of host '[enosserver]:9XXX ([192.168.0.XXX]:9XXX)' can't be established.
ECDSA key fingerprint is 54:fa:20:25:c1:91:d3:3d:4c:8c:47:02:32:f2:5e:8e.
Are you sure you want to continue connecting (yes/no)?

The above dialogue is a one-time thing. Type in “yes”, the connection should be completed and you will be asked for pshare’s password. You should then have a terminal prompt of

[pshare@enosServer ~]$

You are now logged into enosServer as user pshare. Pay attention to the prompt, it will always let you know which computer you are in and the user name. The SSH server on enosServer was configured to NOT allow login as root. If you need to use root for administration, type in su and enter your server’s root password. Anything you type in the Terminal window will now be executed in the enosServer computer. You can execute
pacman -Syu or perform other administrative routines. Type in

# exit            (if you are in as root)
$ exit            (exit again as user. This is the proper way to log out of a network connection.)

You should be back to your client computers prompt. On the LINUX CLIENT COMPUTER, do not terminate your enosServer session by clicking on
the X (close) button at the top right of your terminal window. After properly disconnecting from the enosServer you should return to your local prompt in the terminal window. Now you can close your Client side terminal window by typing in exit once more.

SSH into enosServer and bypass the password

This is all and good, but it is a pain to have to enter the password all the time. Now ssh keys may need to be generated in our client computer as user.

$ ll .ssh
     -rw-------. 1 don don 1831 Jun 8 2019 id_rsa
     -rw-r--r--. 1 don don 406 Jun 8 2019 id_rsa.pub

If the ll command produces the above results, you already have ssh keys. You can skip the instructions in the box. If you don’t have ssh keys, enter the following commands

$ ssh-keygen -t rsa -b 2048 
(create ssh keys for user, hit enter 3 times for defaults )

$ ls -al
     drwx------ don don 4096 Jan 5 1309 .ssh

( .ssh should be drwx------ if not $ chmod 700 .ssh then recheck)

$ ll .ssh
     -rw-------. 1 don don 1831 Jun 8 2019 id_rsa
     -rw-r--r--. 1 don don 406 Jun 8 2019 id_rsa.pub

The id_rsa file is your PRIVATE SSH Key and you should never do anything with it. Don’t copy, move, or otherwise mess with it. Just leave it alone. The id_rsa.pub file is your PUBLIC SSH Key. We need to export your PUBLIC SSH Key to the enosServer.

As user

$ ssh-copy-id -i ~/.ssh/id_rsa.pub pshare @ e nosServer

enter pshare’s password when requested.
You will be returned to your client’s prompt. Now try to log into enosServer

$ ssh pshare@ e nosServer

You should now be logged in to enosServer as pshare without having to enter your password. To do administration, just ssh into the server from a client terminal window Once in enosServer change to root and do most anything you want from a nice GUI terminal window with mouse, scroll bars, cut and paste, etc. The server and client are now configured to
remotely administer the server.

[pshare@enosServer ~]$ exit

repeat exit until back in the client computer.

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