Ramnode Cloud uses OpenStack Security Groups to implement a firewall. A security group is a set of firewall rules which can then be associated with one or multiple instances.
To define a security group, log into https://cloud.ramnode.com and select Security groups then Add
Then you can add rules
As an example, the following security group allows ingress (incoming) traffic on ports 80, 443 and blocks all other traffic.
And then you can associate this security group with an instance, by selecting your instance
And scroll to the Security Groups tab, then select Associate
