Opening port 80 on Oracle Cloud Infrastructure Compute node [closed]

Answer 1

Always refer to the official guide: https://docs.cloud.oracle.com/en-us/iaas/developer-tutorials/tutorials/apache-on-ubuntu/01oci-ubuntu-apache-summary.htm

$ sudo iptables -I INPUT 6 -m state --state NEW -p tcp --dport 80 -j ACCEPT
$ sudo netfilter-persistent save
$ sudo systemctl restart apache2