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8.2.2. Starting an OpenSSH Server

Make sure you have relevant packages installed

To run an OpenSSH server, you must have the openssh-server package installed. See Section 6.2.4, “Installing Packages” for more information on how to install new packages in Fedora 24.
To start the sshd daemon in the current session, type the following at a shell prompt as root:
~]# systemctl start sshd.service
To stop the running sshd daemon in the current session, use the following command as root:
~]# systemctl stop sshd.service
If you want the daemon to start automatically at the boot time, type as root:
~]# systemctl enable sshd.service
ln -s '/usr/lib/systemd/system/sshd.service' '/etc/systemd/system/multi-user.target.wants/sshd.service'
See Chapter 7, Services and Daemons for more information on how to configure services in Fedora.
Note that if you reinstall the system, a new set of identification keys will be created. As a result, clients who had connected to the system with any of the OpenSSH tools before the reinstall will see the following message:
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that the RSA host key has just been changed.
To prevent this, you can backup the relevant files from the /etc/ssh/ directory (see Table 8.1, “System-wide configuration files” for a complete list), and restore them whenever you reinstall the system.