Red Hat Enterprise Linux and CentOS software and installation requirements

The Linux system on which you install Unified Manager requires specific versions of the operating system and supporting software.

Operating system software

The Linux system must have the following versions of the operating system and supporting software installed:

See the Interoperability Matrix for the complete and most current list of supported Red Hat Enterprise Linux and CentOS versions.

The following third-party packages are required:

Note: If you plan to upgrade any of the third-party software after Unified Manager has been running, you must shut down Unified Manager first. After the third-party software installation is complete, you can restart Unified Manager.

User authorization requirements

Installation of Unified Manager on a Red Hat Enterprise Linux system or CentOS system can be performed by the root user or by non-root users by using the sudo command.

Installation requirements

The best practices for installing Red Hat Enterprise Linux or CentOS and the associated repositories on your system are as follows:

If your system does not have internet access, and the repositories are not mirrored from an internet-connected system to the unconnected system, you should follow the installation instructions to determine the external software dependencies of your system. Then you can download the required software to the internet-connected system, and copy the .rpm files to the system on which you plan to install Unified Manager. To download the artifacts and packages, you must use the yum install command. You must ensure that the two systems are running the same operating system version and that the subscription license is for the appropriate Red Hat Enterprise Linux or CentOS version.

Important: You must not install the required third-party software from repositories other than the repositories that are listed here. Software installed from the Red Hat repositories is designed explicitly for Red Hat Enterprise Linux, and conforms to Red Hat best practices (directory layouts, permissions, and so on). Software from other locations might not follow these guidelines, which might cause the Unified Manager installation to fail, or might cause issues with future upgrades.

Port 443 requirement

Generic images from Red Hat and CentOS block external access to port 443. If your browser is unable to connect to your OnCommand product, this may be the issue. The following command enables access to port 443 for all external users and applications: # firewall-cmd –zone=public –add-port=443/tcp –permanent; firewall-cmd –reload

Consult with your IT department prior to executing this command to see if your security policies require a different procedure.