Cloud Firewall Rules on a Linode
A Cloud Firewall has been mentioned towards the bottom of our 2020 Roadmap blog post, however there is no ETA of its implementation at this time. That said, there are ways to help simplify securing your Linode.
Instead of using standard IPtables commands, you can use one of these frontends: UFW or Firewall D. UFW was initially for Arch Linux, Debian or Ubuntu, however it can be installed on Centos since it is available in the EPEL repository. Firewall D is another option that works with Centos, Fedora, OpenSUSE, Red Hat Enterprise Linux, and SUSE Enterprise Linux. Once either option is configured, based on your Linode's distribution, it will make securing your Linode easier. When UFW or Firewall D commands are executed, it place rules on ports and IPs, as well as logging access attempts.
Look to our Blog post for future updates on Cloud Firewalls, as well as other things. Additionally you can can futher Secure your Linode to help limit password attempts and what users have access to it. Let us know if you have any other questions or concerns.