How to recover a lost root password on zLinux systems (s390x/TN3270)

Solution Verified - Updated -

Issue

  • How to recover a lost root password on an s390x system?
  • How to recover a lost root password on an TN3270 system?
  • How to interact with the ZIPL boot loader in order to recover a root password?
  • How to recover a root password on a Red Hat zLinux system?
  • How to recover a root password on an IBM zSystem?

Environment

  • RHEL 7 zLinux on s390x
  • RHEL 7.5 Structure A on s360x
  • RHEL 7.6 zLinux on TN3270

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