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  1. Enable and start firewalld

    Code Block
    systemctl enable firewalld
systemctl start firewalld


  2. Allow SSH (22)

    Code Block
     firewall-cmd --zone=public --add-service=ssh --permanent


  3. Allow http (80)

    Code Block
     firewall-cmd --zone=public --add-service=http --permanent


  4. Allow https (443)

    Code Block
    firewall-cmd --zone=public --add-service=https --permanent


  5. Allow smtp (25)

    Code Block
    firewall-cmd --zone=public --add-service=smtp --permanent


  6. Optionally allow MySQL

    Code Block
    firewall-cmd --zone=public --add-port=3306/tcp --permanent


  7. Reload the firewall configuration

    Code Block
    firewall-cmd --reload