Why is the Grub configuration not getting updated after updating kernel package?

Solution Verified - Updated -

Issue

  • Kernel installation updates are not reflecting to /boot/grub/grub.conf(RHEL 5,6) or /boot/grub2/grub.cfg (RHEL 7)
  • Can not see entries for latest kernel version in grub, even though kernel was installed without error.
  • After updating a server, the old kernel is still booted instead of the new one.
  • How to rebuild grub2.cfg boot file?
  • How to recreate or refresh grub2.cfg boot menu file?

Environment

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

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