How to repair filesystem in rescue environment for Red Hat Enterprise Linux?

Solution Verified - Updated -

Issue

  • How to repair a local filesystem in the rescue environment for Red Hat Enterprise Linux?
  • A system will not load after boot, and it requests a repair of an OS-dependent filesystem, i.e., typically either / (root) or /var.
  • The / (root) filesystem is going into read-only mode.
  • How to repair the / (root) or /var filesystem (either Ext4 or XFS)?

Environment

  • Red Hat Enterprise Linux 9
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 5
  • Local Filesystems (Ext4 and XFS)
  • Rescue Environment

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