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If you plan on running the CentOS distribution as a virtual machine (VM), you need to ensure that the host machine's operating system is supported by the hypervisor.

For this book, we're focusing on the Oracle VirtualBox hypervisor software. Here are a few of the operating systems on which it can run:

 Windows 8.1

 Windows 10

 macOS High Sierra

 Ubuntu 18.04LTS

This list is always evolving. Thus, it's a good idea to visit the Oracle VirtualBox manual website, virtualbox.org/manual, and view the currently supported host operating systems.

Running a virtualized environment will increase the needed resources on your system. You'll need to make sure that the host machine can handle not only the hypervisor, but the CentOS VM as well. Table 4.2 lists the recommended host machine resources for a virtualized CentOS server.

TABLE 4.2: Recommended Host Machine Resources for a CentOS VM

RESOURCE	MINIMUM	RECOMMENDED
CPU	2 GHz dual core	2 or more GHz dual core
Memory	4 GB	16 or more GB
Free disk space	25 GB	30 or more GB

These resource recommendations are guidelines, not rules. Thus, you may need slightly more resources or get by with a fewer. Also, these recommendations assume you are running only one VM at a time. You'll need more resources on your system if you plan on running multiple VMs at the same time or running a VM along with several other apps.

After you have the right level of resources on your host system, you're ready to start downloading the needed software. We'll cover this in the next section.