Why does kernel cannot be upgraded due to insufficient space in /boot ?

Solution Verified - Updated -

Issue

  • Cannot upgrade or install new kernel with yum update
  • There is very little free space in /boot
  • Error message says to run "yum-complete-transaction" to complete yum update after cleaning up space.

Environment

  • Red Hat Enterprise Linux 5.
  • Red Hat Enterprise Linux 6.
  • Red Hat Enterprise Linux 7.
  • Red Hat Enterprise Linux 8.

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