Open Port 80 Oracle Cloud Compute Instance (CentOS)

OracleOpenPort80Centos.md

Open Port 80 Oracle Cloud Compute Instance (CentOS)

FYI This was harder than it needed to be:

1. Looking at your instance info, find VNIC section, click "Public Subnet".
2. Click on your security list.
3. Add a new entry with the following options:

• "Stateless" = No, "Source" = 0.0.0.0/0, "IP Protocol" = TCP, "Source Port Range" = All, "Destination Port Range" = 80

4. SSH to your instance.
5. While SSH'ed in your instance, run command firewall-cmd --permanent --add-service=http.
6. While SSH'ed in your instance, run command firewall-cmd --reload.
7. Now start Apache, NGINX, or whatever server you need to on port 80. You can now access from the internet.

it won't work. Edit: there was a vnic issue

Thanks, that's perfect !

mine just says "Authorization failed.
Make sure polkit agent is running or run the application as superuser."
any ideas?
(im an idiot when it comes to linux)

edit
NVM, im an idiot, i just had to run it with sudo. Duhh

I did executed all commands still I am not able to access casa os with my public ip

edit: executing below commands worked for me

$ sudo firewall-cmd --zone=public --permanent --add-port=80/tcp

$ sudo firewall-cmd --reload

iptables -I INPUT 5 -i ens3 -p tcp --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT

When clicking on Add Security List, it says "None Available".

Ubuntu 24.04 minimal

As of 2025/07/26, using Oracle Linux 9 on an Ampere instance, these firewall-cmd rules are exactly right (modulo adding sudo), thanks so much!

For general information, the zone that's affected when you don't specify a zone is the "public" zone. You can see all the rules on that zone like this:

sudo firewall-cmd --permanent --info-zone=public