RHEL 8: ifup fails with "Error: unknown connection '/etc/sysconfig/network-scripts/ifcfg-ensX'"

Solution In Progress - Updated -

Issue

  • If use NM_CONTROLLED=no in ifcfg file, unable to bring up interfaces with 'ifup' command.
  • ifup commands fails with below error when try to bring up ens3 interface.
# ifup ens3
Error: unknown connection '/etc/sysconfig/network-scripts/ifcfg-ens3'. 

Environment

  • Red Hat Enterprise Linux 8

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