If, for instance, the firewall in the security group is configured incorrectly, the OS-level firewall can act as a backup to protect the instance from possible probes or compromise. You might wonder why we need to configure the firewall at the operating system level in the first place, if this is already taken care of by EC2 security groups within our VPC. ![]() By the way, I will not cover iptables here, as there are many good resources out there already. While Amazon Linux is similar to Red Hat Enterprise Linux (RHEL) in many ways, it does not yet support firewalld. ![]() In this article, we will look at configuring firewall rules via firewalld on Red Hat Enterprise Linux. This is the second part of our server security series. ![]() While AWS EC2 instances should be well protected by VPC security tools, you may still need to implement protection at the OS-level, and that means firewalld.
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