The Open-AudIT installer doesn't cater for Oracle Linux. To get Open-AudIT installed and running, follow the below.

NOTE - Open-AudIT 5.0.0 is not supported on Oracle 7.x (same as Redhat).

Install Open-AudIT as per normal.

You will not have the required php-mbstring package and you will need to allow access to MariaDB and the OMKD daemon from the HTTPD daemon.

Disable the firewall. You might also allow specific rules, that is left to the user.

systemctl stop firewalld

To allow MySQL access, run the below on the command line.

setsebool -P httpd_can_network_connect_db on

To allow outbound proxy requests (from httpd -> omkd)

setsebool -P httpd_can_network_connect 1

Install the php-mbstring package and restart Apache.

nano /etc/yum.repos.d/public-yum-ol7.repo

name=Oracle Linux $releasever Optional Latest ($basearch)

yum clean all
yum-config-manager --enable ol7_optional_latest
yum install php-mbstring
systemctl restart httpd