Questions tagged [initrd]
initrd is a method for loading a temporary file system into memory, during the process of booting the Linux kernel.
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stuck at busy box, attempt to boot old linux at another partition
I have, and able to boot with arch Linux with kernel 5.10.34 normally.
I have older Linux (linuxmint 20.1) on my sda6 with kernel 5.4.0-72 and 5.8.0-50. I am using grub-customizer.
Kindly not answer ...
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1answer
56 views
Why do distros(e.g. Arch) use BOTH initramfs and root={smth}?
I thought the goal of initramfs is to boot a root partition and chroot into it. But I can't understand why do distro developers use initramfs if there is ALWAYS a root={smth} flag.
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grub2: specify http location for linux and initrd in grub.cfg
I am trying to configure network boot to install different Linux OS versions on PowerPC environment. I have an CentOS source machine with httpd, dhcpd and tftp configured. My http server is hosting ...
2
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1answer
134 views
How to verify signed UEFI binaries?
I'm trying to understand why secure boot works on my machine. It is enabled in the UEFI config, everything boots just fine, and mokutil --sb-state says SecureBoot enabled. But I think it shouldn't. ...
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14 views
How to update pci.ids in initrd
I am trying to make my network card work during a CentOS 7 PXE installation. Using inst.dd with the involved rpms/isos does nothing at all, so I was trying to follow CentOS 7.6 - Initrd.img not ...
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1answer
88 views
Dropping to initramfs shell
For many years now I've been an avid windows & mac user. Most recently, the growing love-affair between tech corporatists and government bureaucrats has convinced me to take the plunge into the ...
3
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1answer
52 views
A Small GUI Linux System with UEFI completely running on RAMDisk
I am developing a POS System and I am planning to use Linux.
My requirements are as follows
UEFI Support. (Running on x86 and x86_64)
No Storage Drive so completely running on RAM and persistence ...
0
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2answers
446 views
is /sbin/init an executable?
# Mount the root filesystem.
1 .mount -o ro /dev/sda1 /mnt/root
# Boot the real thing.
2 .exec switch_root /mnt/root /sbin/init
This is a piece of code from /init file of initramfs as mentioned in ...
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91 views
Difference between initrd.img and a initramfs.img?
an initrd.img sets the stage for the real root file system to take over once done, as I understand it the initramfs.img is a customizable version of the initrd. lets say you are loading to a diskless ...
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382 views
Automate Debian installation with preseed in initrd
I'm trying to automate the installation of Debian in a Virtualbox VM.
According to this article :
If you are using initrd preseeding, you only have to make sure a file named preseed.cfg is included ...
4
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2answers
578 views
/boot/vmlinuz file is not presemt
I am using debian and when I was just checking my filesystem there was no vmlinuz file and after a bit of googling many user with no vmlinuz were having trouble to boot but my computer is booting well....
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879 views
How to pack an extracted initrd (x-cpio archive)?
I am customizing an Ubuntu 20.04 ISO, in this process, I have to edit the files inside initrd file which is inside the casper directory Ubuntu20.04-ISO/casper/initrd
How to recompile this file type of ...
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1answer
427 views
Ubuntu 20.04 on zfs on root on LUKS on UEFI
I am following https://github.com/openzfs/zfs/wiki/Ubuntu-18.04-Root-on-ZFS but doing it for Ubuntu 20.04.
When I get to:
update-initramfs -u -k all
nothing happens: It returns after 0.1 second and ...
0
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1answer
193 views
Problem extracting the “initrd” archive in kernel 5.4
I can see my initrd is occupied almost 90 MB of disk but after extracting it via cpio , it contains only a 30 KB microcode :
$ cpio -it < initrd.img-5.4.0-18-generic
.
kernel
kernel/x86
kernel/...
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2answers
72 views
Why does a shebang script run as init= have an euid of 0 when run from an initrd, but not otherwise?
I am trying to create my own PID 1 init script, to be called from the boot cmdline with init=/myscript. How can I make it work on a real filesystem, with any kernel?
When it runs in an initrd, it ...
0
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1answer
560 views
CentOS 7.6 - Initrd.img not loading updated driver
I have been trying to load an updated initrd.img file with updated drivers on booting the Centos 7.6 ISO, however it seems to still load the old driver even though I have replaced the driver.
Steps ...
0
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1answer
34 views
initrd and intramfs purpose confusion
My understanding of the purpose of having initrd or intramfs is for the kernel to be able to mount a temporary file system in RAM to load drivers and other things in order to be able to mount the ...
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1answer
229 views
In a systemd initrd, how do I persist a mount into the new root
Background
I'm building a custom initrd using dracut. It:
mounts an ext4 disk partition to /data
retrieves a squashfs image over the network, which it stores in /data
mounts the squashfs
mounts an ...
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0answers
23 views
Initrd - rebooting issue
I recently booted into Root via Ubuntu kernel recovery mode. When I finished what I was doing, and not altering anything in my system, I tried to reboot with shutdown -r now. This started various ...
0
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1answer
132 views
Ubuntu 18.04.3 netboot PXE fresh installed boots up with Ethernet not managed by Network Manager
I'm trying to set up a PXE server to deliver Linux image for end user workstation in my company.
I've finally made it to set up dnsmasq and nfs-kernel-server so now I can get the images via network ...
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0answers
98 views
How create RAID 1 on working Slackware 14.2?
I use Slackware 14.2 (with kernel 4.4.14-smp)
on sda and I'm trying to create the RAID 1 with additional sdb. I'm using the VM VirtualBox.
First, I have cleaned the sdb:
dd if=/dev/zero of=/dev/sdb ...
2
votes
2answers
3k views
Grub: boot with USB key, then continue booting from SD card?
I have an old laptop that has a built-in SD card reader, only it's not available at boot.
I can however grub boot linux (Debian) from a small 8GB USB key (USB 2.0), but it's very slow. The SD card is ...
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0answers
69 views
Initramfs not reading new configuration/scripts
I am trying to add some custom initramfs scripts to /etc/initramfs-tools/scripts/init-bottom/. However, these are not executed at next boot, after having rebuilt with
# update-initramfs -u
In fact, ...
1
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1answer
413 views
How to boot OpenWRT FROM PXE?
I have downloaded OpenWRT files for PC from OpenWRT site. I have installed DHCP and TFTP (in my LAN) and can boot (other) kernels from them.
Now I want to boot these OpenWRT files.
I wrote in PXE ...
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0answers
28 views
Take initrd out of the Linux boot process
I have "one" machine which is static. The following never change: CPU, GPU, motherboard, harddrive, keyboard, mouse, USB ports
I have dual-boot Windows and Linux (specifically Windows 10 and Ubuntu)
...
2
votes
1answer
146 views
initrd and initramfs confusions
I read from arch wiki:
In case your root filesystem is on LVM, you will need to enable the
appropriate mkinitcpio hooks, otherwise your system might not boot.
However, both my initrd and ...
0
votes
1answer
1k views
How to copy the /bin files along with dependencies using commands?
The /bin folder of Ubuntu 14.04 has files with dependencies. I want to copy the symbolic links along with the files, into a separate directory. Is there an inbuilt command for this?
3
votes
1answer
876 views
My initrd has only one directory, after decompressing, namely 'kernel'
The file shows 56 blocks as the size. I am using the system Ubuntu 16.04 and I need a solution that does not require me to update the kernel.
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0answers
124 views
trap signal in bash initramfs fails to work
inside /init bash script executed by the kernel in initramfs.img i need to send a signal to drop me to a rescue shell, so i have
trap "exec /bin/bash" SIGINT
but ctrl+C isn't effective.
First why ...
2
votes
1answer
422 views
Kernel can't find initrd?
When trying to mount ext2 I get this error:
Creating 4 MTD partitions on "MPC8313RDB Flash Map Info":
0x000000000000-0x000000100000 : "U-Boot"
0x000000100000-0x000000300000 : "Kernel"
0x000000300000-...
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vote
1answer
579 views
Can't mount squashfs loop during initramfs
I am trying to mount a squashfs file during initramfs.
I have included loop and squashfs modules.
Currently using mount /foo.squashfs /mountpoint
or mount -t squashfs -o loop /foo.squashfs /...
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vote
2answers
2k views
how to know the right size of /boot
for now /boot on our linux machines is
/dev/sda1 497M 157M 340M 32% /boot
we want to create a new linux redhat template
and I have the feeling that /boot size is too small
for ...
0
votes
1answer
71 views
kernel sysfs doesn't recognize storage kobjects [closed]
I am using ubuntu kernel 4.xx with corresponding ubuntu initrd.img, and it works. But, I want to use a custom initramfs inspired by lfs (linux from scratch) initramfs. The kernel extracts, and runs ...
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0answers
127 views
How to add ssmtp into initramfs?
I'm trying to add ssmtp into initramfs. However, I can not find (or compile at the moment) the statically linked version. I guess my only option is adding the current, dynamically linked version.
I'...
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0answers
4k views
Ubuntu 18.04 LUKS boot problems
Problem description
I am trying to achieve dualboot of Windows 10 (pre-installed) and Ubuntu 18.04 on a new laptop. This is not very difficult, however it appears to get much more complex if you also ...
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0answers
262 views
Why can't dd write to /dev/ram0 on Core Linux?
I created an ext2 file-system on /dev/ram0 ramdisk, and mounted it at /mnt/ram.
mkdir /mnt/ram
mkext2fs /dev/ram0
sudo mount /dev/ram0 /mnt/ram -o rw
Reading from ramdisk with dd works.
dd if=/dev/...
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1answer
2k views
How to find modules used in initrd?
Is there a way to see all the kernel modules/drivers put in the initrd/intramfs?
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1answer
2k views
GRUB Can't find sda partition
I have dualboot on my laptop with windows being the primary OS. Today after my linux os froze I hard rebooted the laptop. After that I got a kernel panic. I've been trying to solve it using GRUB.
I ...
4
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1answer
1k views
Did the pivot_root() documentation anticipate the feature of mount namespaces?
pivot_root() moves the root filesystem of the calling process to the directory put_old and makes new_root the new root filesystem of the
calling process.
The typical use of pivot_root(...
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0answers
652 views
Accessing initramfs-tools features in Yocto generated initramfs image
I would like to load a few kernel modules, and activate framebuffer access prior to Plymouth launch. This is normally done using /etc/initramfs-tools directory provided with the initramfs-tools. ...
3
votes
2answers
648 views
Why kernel cannot do the initrd/initramfs job itself? [closed]
Currently I am learning about linux booting process.Here i noticed that the initrd will create temporary root file system that includes drivers(LVM, NFS, etc) which are required by kernel.After that ...
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2answers
2k views
Uboot Hangs when Initrd size increased in FIT image
I'm booting Linux on arm64 using FIT multi image (image + initrd + DTB). If I increase the initrd size (from 16 MB -> 20MB) the board hangs at "starting kernel"). However if I change the ...
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0answers
264 views
How to boot a debootstrap-ed system bare metal?
I debootstrap an Ubuntu Xenial system as:
debootstrap --variant=minbase --include=linux-image-generic,linux-headers-generic,systemd,systemd-sysv,dbus --components=main,restricted,universe,multiverse ...
6
votes
1answer
808 views
How to combine linux kernel and initrd without compiling?
I know that it's possible to extract from a linux kernel the embedded initramfs cpio. I want to know if the reverse operation is possible; i.e., given both a compiled kernel and initramfs archive, how ...
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0answers
87 views
Tntfs.ko - How can I put it in an initrd file? Or load on boot?
I'm trying to load that specific module (for zenworks purposes), but I can't find the right command to put in my server boot. I tried insmod and modprobe commands, but I'm unsuccessful in doing that.
...
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2answers
153 views
Linux 2.4.0 - How to Create a Root Filesystem for a diskless install
I have a really old build of Linux (version 2.4.0). Please don't ask me why I have such an old version since it's for a very specialised bit of old hardware. Anyway, problem is, I get this message ...
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2answers
3k views
Debian system doesn't mount or find /sbin/init during boot
I'm getting the dreaded "target filesystem doesn't have requested /sbin/init", am getting dropped into initramfs busybox prompt, and am unable to boot. This is after upgrading to the latest 4.9.0-3 ...
0
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1answer
5k views
How to change the kernel on Kali Linux live usb persistence?
I am using Kali Linux on a bootable USB with persistence. I have updated it using all the update/upgrade/dist-upgrade commands. When I tried to install VMware I noticed a problem with the kernel. It ...
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0answers
221 views
Using an initrd/initramfs as the root filesystem
In Android, the initial RAM disk stays mounted throughout the entirety of the time the operating system is running. No switch_root/pivot_root takes place.
Is this kind of setup easy to pull off with ...
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4answers
13k views
How to change the boot kernel of a usb live w/ persistent running Kali
First, the issue that I'm having is being unable to run VirtualBox on Kali 2.0.
I set up a usb live with persistence running Kali 2.0, which at the time had the 4.6.0-kali1-amd64 kernel. I have ...
