Initramfs init: Difference between revisions
WhyNotHugo (talk | contribs) (→initramfs init cmdline options: remove WIP title) |
Prabuanand (talk | contribs) (added sample mkinitfs.conf) |
||
| Line 9: | Line 9: | ||
In addition to the [https://www.kernel.org/doc/html/v4.14/admin-guide/kernel-parameters.html kernel boot parameters] are a number of parameters that the init script understands. These are documented in the <code>mkinitfs-bootparam(7)</code> man page. | In addition to the [https://www.kernel.org/doc/html/v4.14/admin-guide/kernel-parameters.html kernel boot parameters] are a number of parameters that the init script understands. These are documented in the <code>mkinitfs-bootparam(7)</code> man page. | ||
Depending on your HDD type and filesystem used, the file appears as follows: | |||
{{cat|/etc/mkinitfs/mkinitfs.conf|features{{=}}"ata base ide scsi usb virtio ext4 nvme"}} | |||
Although you may specify your own init script when building an initramfs, these parameters allow for extensive control over the initial startup of an Alpine Linux system. | Although you may specify your own init script when building an initramfs, these parameters allow for extensive control over the initial startup of an Alpine Linux system. | ||
Revision as of 04:09, 16 December 2024
mkinitfs is a tool to create initramfs images. Initramfs images are small images which contain a small filesystem with everything required to boot Alpine. For example, when booting a setup with full disk encryption, the initramfs contains the binaries required to prompt for a password and mount the encrypted disk.
Usage
Under a running alpine machine, the following command can be used if for some reason the initramfs has not been created properly for a new kernel.
mkinitfs -c /etc/mkinitfs/mkinitfs.conf -b / <kernelvers>
The script is located in /sbin/ and is created with ash. It expects /lib/modules to be populated with the <kernelvers> listed. For variations on this command (e.g. for chroot) Search "mkinitfs".
initramfs init cmdline options
In addition to the kernel boot parameters are a number of parameters that the init script understands. These are documented in the mkinitfs-bootparam(7) man page.
Depending on your HDD type and filesystem used, the file appears as follows:
Contents of /etc/mkinitfs/mkinitfs.conf
Although you may specify your own init script when building an initramfs, these parameters allow for extensive control over the initial startup of an Alpine Linux system.