Again, the target for logging in with ssh is Ubuntu 18.04. What I did to increase security
# vim /etc/ssh/sshd_config
Open the config file with, look for Port 22 and enter any port
There are well-known ports, so let's think about it.
By the way, if you do not remove #, it will be commented out, so don't forget to remove it.
However, this alone cannot be changed, so
Let's add a new port number to SELinux policy and change the firewalld settings as well.
This area will come out as soon as you check it.
#PermitRootLogin no
Find PermitRootLogin in the same way and set it to no
I will write here later
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