centos7 update ssh port

0x01 open ports firewall

It should include 22 port

systemctl status firewalld
firewall-cmd --zone=public --list-all 
firewall-cmd --permanent --zone=public --add-port=222/tcp
firewall-cmd --permanent --zone=public --add-port=22/tcp

0x02 update sshd config

sudo vi /etc/ssh/sshd_config

add:

Port 22
Port 222

0x03 install semanage

It involve with the problem of SELinux when we update ssh ports.

yum provides semanage
yum -y install policycoreutils-python
semanage port -a -t ssh_port_t -p tcp 222

and

systemctl restart sshd
or
reboot

0x04 end

firewall-cmd --permanent --zone=public --remove-port=22/tcp
firewall-cmd --reload

vi /etc/ssh/sshd_config & remove Port 22