How can I deploy a system and use LVM snapshot/merge to be able to restore an earlier state of the root filesystem?

Solution Verified - Updated -

Issue

  • How can I deploy a system and use LVM snapshot/merge to be able to restore an earlier state of the root filesystem?
  • How can I use LVM snapshot/merge to be able to rollback my system to an earlier state?
  • How can I use LVM snapshots/merge as part of my patching strategy?
  • How can I get a failsafe / backout mechanism subsequent to application of patches / packages which could introduce problems?
  • Does Sun's 'live upgrade' or a similiar functionality exist on Red Hat Enterprise Linux?

Environment

  • Red Hat Enterprise Linux 6, 7 and 8

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