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Rocky Linux 8: ifup fails with “Error: unknown connection ‘/etc/sysconfig/network-scripts/ifcfg-ensX'”

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Operating System and Software

  • Rocky Linux 8

Problem

  • 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'.

How to Fix

  • There are two ways to resolve the issue:
    • Remove NM_CONTROLLED=no option from ifcfg file.
    • Install network-scripts package to utilize the legacy ifup command.

Origin of the Problem

  • From Rocky Linux 8, ifup command is provided by NetworkManager package. Network scripts are deprecated in Rocky Linux 8 and they are no longer provided by default.
# rpm -qf `which ifup`
NetworkManager-1.14.0-5.el8.x86_64

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