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A Red Hat training course is available for Red Hat Enterprise Linux

2.5. Post-installation Procedures

The following steps are the security-related procedures that should be performed immediately after installation of Red Hat Enterprise Linux.
  1. Update your system. enter the following command as root:
    ~]# yum update
  2. Even though the firewall service, firewalld, is automatically enabled with the installation of Red Hat Enterprise Linux, there are scenarios where it might be explicitly disabled, for example in the kickstart configuration. In such a case, it is recommended to consider re-enabling the firewall.
    To start firewalld enter the following commands as root:
    ~]# systemctl start firewalld
    ~]# systemctl enable firewalld
  3. To enhance security, disable services you do not need. For example, if there are no printers installed on your computer, disable the cups service using the following command:
    ~]# systemctl disable cups
    To review active services, enter the following command:
    ~]$ systemctl list-units | grep service