Centos Change SSH Port 

How to change the ssh port on centos 6, 7, and 8
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sudo yum -y install firewalld
Start firewall ----) systemctl start firewalld
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sudo yum -y install policycoreutils-python-utils
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sudo yum -y install net-tools
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sudo yum -y install nano
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Edit Port ----) nano /etc/ssh/sshd_config
CTRL+X & y & Enter = Save
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Check Port ----) semanage port -l | grep ssh
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Open Port ----) sudo semanage port -a -t ssh_port_t -p tcp 3223
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Open Port_Firewall ----) sudo firewall-cmd --add-port=3223/tcp --permanent
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Reload Firewall ----) sudo firewall-cmd --reload
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Restart SSH ----) sudo systemctl restart sshd
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