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By capturing a hardened base operating system image (with no applications installed) in a template, you can ensure that all your virtual machines are created with a known baseline level of security. You can then use this template to create other, application-specific, templates or use the application template to deployvirtual machines
Provide templates for virtual machine creation that contain hardened, patched and properly configured OS deployments. If possible, predeploy applications in templates as well, although care should be taken that the application doesn’t depend upon virtual machine–specific information to be deployed. In vSphere, you can convert a template to a virtual machine and back again quickly, which makes updating templates quite easy. VMware Update Manager also provides the ability to automatically patch the operating system and certain applications in a template, thereby ensuring that they remain up to date.
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