The `hostname -f` and `hostname -d` Return Incorrect Values Due to Misconfigured `/etc/hosts`

Solution Verified - Updated -

Issue

The system hostname commands return incorrect or incomplete values:

  • hostname -f returns only the short hostname (server1)
  • hostname -d returns nothing
  • hostname --all-fqdns only shows server1

Environment

  • Red Hat Enterprise Linux (RHEL) 6 / 7 / 8 / 9

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