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When the server is directly connected to the internet, the firewall is to be setup for security purpose. On CentOS 7, FirewallD is a kind of minimum requirements in terms of security point of view. You can simply install FirewallD by sudo yum install firealld and add policy by sudo firewall-cmd --zone=public --permanent --add-service=http |
STEP 1. Install FirewallD
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sudo yum install -y firewalld |
STEP 2. Enable FirewallD
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sudo systemctl enable firewalld sudo reboot |
STEP 3. Verify that the service is running and reachable
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sudo firewall-cmd --state |