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An ISO image file (also called an ISO image) is a specially formatted package file that contains all of the files needed to boot a system. The ISO image file is used to boot and then install the distribution.

To find the needed CentOS ISO image file, first go to the website: centos.org/download/. The type of processor you have will determine your next step. Click the appropriate CPU type for your processor under the CentOS Linux section, shown in Figure 4.1.

FIGURE 4.1 Option to choose to access the appropriate CentOS ISO image file download site

A new browser window will appear, allowing you to select from several sites to start the download process. You can click any of the sites. Once you do, you should get a window similar to what is shown in Figure 4.2.

Click the CentOS‐8 * boot.iso link to start the download of the CentOS ISO image file. Depending on the web browser you are using, you may have to deal with some pop‐up windows that want to confirm it is OK to download this file. You'll most likely want to keep this website open or bookmark it in your browser, because we use the checksum information provided here soon.

FIGURE 4.2 Option to choose for CentOS ISO image file download