Add: How to switch ssh port on RHEL

[rbo]

• Change vim /etc/ssh/sshd_config Result

  [root@pluto ~]# grep 'Port ' /etc/ssh/sshd_config
  Port 22
  Port 1984

• Local firewqall: firewall-cmd --zone public --add-port 1984/tcp --permanent && firewall-cmd --reload
• SELinux semanage port -a -t ssh_port_t -p tcp 1984
• Adjust Hetzner Firewall:
• Reload sshd systemctl reload sshd
• Check listen port:

  $ ss -tulpn | grep  1984
  tcp   LISTEN 0      128           0.0.0.0:1984       0.0.0.0:*    users:(("sshd",pid=1349,fd=3))                            
  tcp   LISTEN 0      128              [::]:1984          [::]:*    users:(("sshd",pid=1349,fd=4))