How to disable NetworkManager in RHEL?

Solution Verified - Updated -

Issue

  • Disabling NetworkManager

    • What steps are needed to disable the NetworkManager service?
    • What is needed to ensure it does not start again on a subsequent reboot?
  • Disabled NetworkManager but still seeing errors (need to fully disable)

    • Trouble configuring networking with NetworkManager and need to disable.
    • Disabled NetworkManager but still seeing errors about it and "Connection activation failed"

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • NetworkManager service.

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