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Firewall Settings

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RHEL

RHEL uses the firewall-cmd command or firewall-config GUI for configuring the firewall. For example, the following commands will open up port 8082 publicly: 
firewall-cmd --zone=public --add-port=8082/tcp --permanent
firewall-cmd --reload

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SUSE

SUSE uses the firewall-cmd command or firewall-config GUI for configuring the firewall. For example, the following commands will open up port 8082 publicly: 
firewall-cmd --zone=public --add-port=8082/tcp --permanent
firewall-cmd --reload

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Ubuntu

Ubuntu comes with a ufw (Uncomplicated FireWall) command, which controls the firewall, for example: 
sudo ufw allow 8181