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How to rebuild the initial ramdisk image in Red Hat Enterprise Linux

Solution Verified - Updated 2018-08-09T20:37:23+00:00 -

Issue

How to rebuild the initial ramdisk image in Red Hat Enterprise Linux
How to remake or recreate the initrd or initramfs
The /etc/lvm/lvm.conf and root file system resides on a logical volume. How to ensure the changes are applied upon rebooting?
The /etc/multipath.conf and my root file system resides on a multipath device. How to ensure the changes are applied upon rebooting?
The module options in /etc/modprobe.conf or /etc/modprobe.d/ have been modified. How to ensure the changes are applied upon rebooting?

Environment

Red Hat Enterprise Linux (RHEL) 7
Red Hat Enterprise Linux (RHEL) 6
Red Hat Enterprise Linux (RHEL) 5
Red Hat Enterprise Linux (RHEL) 4
Red Hat Enterprise Linux (RHEL) 3
initrd / initramfs image

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