• Redhat has made many changes going from Redhat 7 to Redhat 8. Read the documentation for the task you require before implementing or changing it.


    Under this section when Redhat is mentioned it will generally apply to Centos(Community driven Redhat) and Fedora(upstream for RHEL). They are all similar but, because RHEL is an enterprise product there will be differences in features.

    Unless otherwise stated articles relate to the latest release.

    The commands in the articles are written to highlight they exist and not necessarily to favour one command over another. Various commands in Linux provide similar results.

    Good advice from Redhat below, but applies for all operating system changes on any platform.

    Configuring kernel parameters on a production system requires careful planning. Unplanned changes may render the kernel unstable, requiring a system reboot. Verify that you are using valid options before changing any kernel values.

    Automation & Configuration Management.

    Many operating systems are configured via automation & configuration management tools. When using these for operating system configuration files, it is best practice to continue using these.

    Redhat Network Management

    Outside of using automation & configuration management** For later Redhat releases when choosing to configuring the network using redhat config files (ifcfg-*) network scripts or NetworkManager, see quote.

    Red Hat developers have worked hard to ensure that scripts and NetworkManager cooperate with each other. Administrators who are used to the scripts can certainly continue to use them. We expect both systems to be able to run in parallel and work well together. It is expected that most user shell scripts from previous releases will still work. Red Hat recommends that you test them first.
    • When editing ifcfg-eth* files, NetworkManager must be told by issuing a reload or specifically prompt NetworkManager to recognise interface file changes.
    • If using ifcfg-eth* files, make a backup outside of the network-scripts directory.

    Cloud platform vendors may object to running port scans in their network. If you are running testing it is advisable to inform them in advance.

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