A minimal base OS image can be used to build a NetBoot image and smart configurations for imaging.
Creating a minimal base OS image involves the following steps:
Casper Suite, Imaging Suite, Composer
See the following Knowledge Base article from Apple for instructions on how to install a clean copy of macOS:
Before building a package of the OS, you need to ensure that the OS is completely configured to your environment. The way that you decide to configure the OS depends on how you plan to use the minimal base OS image.
If you plan to image computers using the minimal base OS image, consider performing the following tasks:
Activate Remote Login (SSH) and Remote Management (Apple Remote Desktop). a. Navigate to the Sharing pane in System Preferences. b. Select the Remote Login checkbox in the sidebar to enable SSH. c. Select the Only these users option in the Allow Access For pane. d. Click the Add (+) button and select the main administrator's account and any other accounts you would like to have remote access, and then click Select. e. Select the Remote Management checkbox to enable Apple Remote Desktop. f. Select the Only these users option in the Allow Access For pane. d. Click the Add (+) button and select the main administrator's account and any other accounts you would like to have remote access, and then click Select.
Configure Automatic Login and Login Window settings. a. Navigate to the Accounts or Users & Groups pane in System Preferences. b. Select Login Options in the sidebar. c. If System Preferences does not allow you to make changes, click the lock icon, and then authenticate locally when prompted. d. Select "Off" from the Automatic login pop-up menu. e. Select the Name and password option.
Perform any other system security fortification.
Configure miscellaneous settings, such as:
a. Energy Saver settings
b. Keyboard and mouse settings
c. Network settings
d. Sharing settings
e. Name and password or list of users
Run all available software updates.
For instructions on how to build an OS package, see "Building OS Packages" in the Casper Suite Administrator's Guide.
For instructions on how to use a minimal base OS image to create a NetBoot image, see "Creating NetBoot Images for Use with the Casper Suite".
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