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The system configuration and management requirement for the RHCE exam covers a range of topics, including the following:

 Firewalls: Block or allow traffic to selected ports on your system that offer services such as web, FTP, and NFS, as well as block or allow access to services based on the originator's IP address. Firewalls are covered in Chapter 25, “Securing Linux on a Network.”

 Kerberos authentication: Use Kerberos to authenticate users on a RHEL system.

 System reports: Use features such as sar to report on system use of memory, disk access, network traffic, and processor utilization. Chapter 13 describes how to use the sar command.

 Shell scripting: Create a simple shell script to take input and produce output in various ways. Shell scripting is described in Chapter 7.

 SELinux: With Security Enhanced Linux in Enforcing mode, make sure that all server configurations described in the next section are properly secured with SELinux. SELinux is described in Chapter 24.

 Ansible: Understand core Ansible components (inventories, modules, playbooks, and so on). Be able to install and configure an Ansible control node. Work with Ansible roles and use advanced Ansible features. See Chapter 29 for information on using Ansible playbooks to install and manage Linux systems.