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alpine-user

Re: [alpine-user] Squashfs root filesystem

From: Lars-Erik Helander <lehswe_at_icloud.com>
Date: Fri, 7 Jun 2019 16:34:42 +0200

Hi Paul,

thank you very much for the hints :)

/Lars

Skickat från min iPhone

> 7 juni 2019 kl. 16:27 skrev Paul Zillmann <p.zillmann_at_h6g.de>:
>
> Hello Lars-Erik,
>
>> Am 07.06.19 um 12:40 schrieb Lars-Erik Helander:
>> Is it possible to configure boot to run alpine using a read-only mounted squashfs file?
>
> Yes it is, supposing the Kernel and initramfs are not part of the squashfs file.
> Take a look at [1] if the Kernel arguments work for you.
>
> Otherwise you can modify the init script here:
> - mount the fs where the squashfs lies
> - mount the squashfs
> - mount a tmpfs
> - mount an overlayfs as the new root, lower dir would be squashfs, upper dir is the tmpfs
> The scipt is located at /usr/share/mkinitfs/initramfs-init
> Important parts at this section is "nlplug-findfs" and "exec /bin/busybox switch_root" to exit the initramfs into the bootet system. (You can replace the code in lines 479-490 as present in the linked repository)
>
> Don't forget do add the squashfs and overlayfs Kernel modules into the initramfs, then regenerate the initramfs.
>
> You should also take a look into the Alpine Netboot which uses modloop instead of squashfs.
>
> 1: https://git.alpinelinux.org/mkinitfs/tree/initramfs-init.in#n455
>
> - Paul
>
>>
>> The mkinit code seems to include some squashfs support, but I can not figure if that could be used for my purpose.
>>
>> /Lars
>>
>> Skickat från min iPhone
>>
>>
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Received on Fri Jun 07 2019 - 16:34:42 UTC