update-initramfs Man page

UPDATE-INITRAMFS(8) update-initramfs manual UPDATE-INITRAMFS(8)

NAME

update-initramfs – generate an initramfs image

SYNOPSIS

update-initramfs -c|-d|-u [-k version] [-t] [-v] [-b directory] [-h]

DESCRIPTION

The update-initramfs script manages your initramfs images on your local
box. It keeps track of the existing initramfs archives in /boot.
There are three modes of operation create, update or delete. You must
at least specify one of those modes.

The initramfs is a gzipped cpio archive. At boot time, the kernel
unpacks that archive into RAM disk, mounts and uses it as initial root
file system. All finding of the root device happens in this early
userspace.

OPTIONS

-k version
Set the specific kernel version for whom the initramfs will be
generated. For example the output of uname -r for your cur‐
rently running kernel. This argument is optional for update.
The default is the latest kernel version.

The use of “all” for the version string specifies
update-initramfs to execute the chosen action for all kernel
versions, that are already known to update-initramfs.

-c This mode creates a new initramfs.

-u This mode updates an existing initramfs.

-d This mode removes an existing initramfs.

-t Allows one to take over an custom initramfs with a newer one.

-v This option increases the amount of information you are given
during the chosen action.

-b directory
Set an different bootdir for the image creation.

-h Print a short help page describing the available options in
update-initramfs.

EXAMPLES
Update the initramfs of the newest kernel:

update-initramfs -u

Create the initramfs for a specific kernel:

update-initramfs -c -k 2.6.18-1-686

FILES
/etc/initramfs-tools/update-initramfs.conf

AUTHOR

The initramfs-tools are written by Maximilian Attems ,
Jeff Bailey and numerous others.

SEE ALSO

initramfs.conf(5), initramfs-tools(8), mkinitramfs(8), lsinitramfs(8).

Linux 2008/12/19 UPDATE-INITRAMFS(8)