How to join Active Directory domain if Linux hostname is more than 15 characters.

Solution Verified - Updated -

Issue

  • Not able to join Active directory domain if hostname is more than 15 characters.
  • User is not able to login after joining the AD domain if the hostname is more than 15 characters.

  • realm -v join fails with error:

    ! Couldn't lookup computer account: TEST-HOSTNAME-01$: Size limit exceeded
adcli: joining domain example.com failed: Couldn't lookup computer account: TEST-HOSTNAME-01$: Size limit exceeded

Environment

  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9
  • Red Hat Enterprise Linux 10
  • sssd
  • realmd
  • adcli
  • net/samba

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