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====== Ubuntu - SSH - Install SSH ======

<code bash>
sudo apt install ssh
</code>

----

===== Verify that SSH is running =====

<code bash>
sudo systemctl status ssh
</code>

returns:

<code bash>
● ssh.service - OpenBSD Secure Shell server
     Loaded: loaded (/lib/systemd/system/ssh.service; enabled; vendor preset: enabled)
     Active: active (running) since Fri 2021-11-19 09:47:32 GMT; 2 days ago
       Docs: man:sshd(8)
             man:sshd_config(5)
   Main PID: 885 (sshd)
      Tasks: 1 (limit: 9403)
     Memory: 7.5M
     CGroup: /system.slice/ssh.service
             └─885 sshd: /usr/sbin/sshd -D [listener] 0 of 10-100 startups

Nov 19 09:47:32 plex systemd[1]: Starting OpenBSD Secure Shell server...
Nov 19 09:47:32 plex sshd[885]: Server listening on 0.0.0.0 port 22.
Nov 19 09:47:32 plex sshd[885]: Server listening on :: port 22.
Nov 19 09:47:32 plex systemd[1]: Started OpenBSD Secure Shell server.
Nov 19 09:48:15 plex sshd[1358]: Accepted password for peter from 192.168.1.69 port 49974 ssh2
Nov 19 09:48:15 plex sshd[1358]: pam_unix(sshd:session): session opened for user peter by (uid=0)
Nov 21 21:24:44 plex sshd[83478]: Accepted password for peter from 192.168.1.69 port 35628 ssh2
Nov 21 21:24:44 plex sshd[83478]: pam_unix(sshd:session): session opened for user peter by (uid=0)
</code>

----

===== Start the SSH Service =====

If the service is not running, start it:

<code bash>
sudo systemctl start ssh
</code>

----

===== Enable SSH Service to Start on Boot =====

To ensure that the SSH service automatically starts after a reboot, you need to enable it using systemctl. 

<code bash>
sudo systemctl enable ssh
</code>

----

===== Firewall - Open the SSH port =====

<code bash>
sudo ufw allow ssh
sudo ufw enable
</code>

<WRAP info>
**NOTE:**  This configures UFW to allow inbound SSH connections, ensuring that remote attempts to connect to the server via SSH are not blocked by the firewall.
</WRAP>

----

===== Test =====

From a remote system, try to connect to this system using SSH:

<code bash>
ssh username@server_ip_OR_hostname
</code>

<WRAP info>
**NOTE:**  Replace **username** with the actual username on the system, and **server_ip** with the IP address of the machine being connected to.
</WRAP>

----

===== TAGS =====

  * TAG:  Networking
  * TAG:  Security
  * TAG:  Server
  * TAG:  SSH