Questions tagged [initramfs]

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How does linux know to mount / without /etc/fstab [migrated]

When /etc/fstab gets deleted/name is changed booting into the machine still works, in addition the root file system (/) is still mounted and on the correct storage device, how does it know to mount / ...
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Initramfs - Set hostname from custom initrd script

In our company, I'm creating an Ubuntu Autoinstaller (v. 20.04). For some company reasons, its required modify initramfs. (initrd file). I'm created a script, and added a link to init file in main ...
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1answer
36 views

Intel DH895XCC Series QAT and ZFS (2.0.0) - custom initramfs with dracut

We would like to run ZFS with QAT offloading for compressions and checksums. The distribution is Centos 8.2 with the stock kernel: [root@dellqat ~]# uname -a Linux dellqat 4.18.0-193.19.1.el8_2.x86_64 ...
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1answer
56 views

HP Proliant ML350 Gen9 Server with Debian Linux Kernel Does not boot HBA mode SAS drives. initramfs timeout. long disk detection. disks not recognized

This is what I have: 1- HP Proliant ML350 Gen9 with SAS LFF (3.5 inch) Disks running in HBA mode. 2- Debian Linux version 10 (Buster) Kernel Does not boot HBA mode SAS drives normaly. I have to go to ...
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IPMI KVM video not working during the initramfs emergency shell

Debugging boot issues has been difficult because my server's IPMI video stream freezes right before the initramfs loads and only resumes once the system completes booting to present the login prompt. ...
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2answers
471 views

ZFS modules suddenly stopped loading - Debian 10

My ZFS modules have mysteriously stopped loading at the point during boot when you would usually unlock the pool with encrypted ZFS on root (Debian 10). It drops into busybox and suggests loading the ...
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1answer
211 views

Why do I have a dracut initramfs in /var/tmp?

I never used dracut so far. I understood dracut filesystems (Wiki) as temporary systems that help mounting system specific kernel modules during the boot process. But after successful boot of my SLES ...
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Ubuntu 16.04 Server initramfs issues device-mapper : resume ioctl on (252:0) failled: Invalid argument Unable to resume ubuntu--vg-root (252:0)

After successful expanding storage in VMware Esxi, my coworker increase also the capacity in Ubuntu server 16.04 and resulting error initramfs Please help to solve this error i am new to linux server. ...
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190 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 ...
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2k views

CentOS: Install dm-raid module into initramfs to enable lvm raid boot?

I have CentOS 7, and I want lvm mirrors on my root logical volume. I had some panic after I used "lvconvert -m3 cl_excalibur/root" to create two mirrors, and it would not boot. The logical volume ...
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420 views

Ubuntu Server 16.04 initramfs error after full recovery to new hardware

I am getting an error after recovering my Ubuntu Server 16.04. It is only booting in advance recovery option (initramfs). Below is the complete error. Can anyone please help? Begin: Running /scripts/...
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493 views

Reinstalling broken kernel 4.9.0.9 on Debian Stretch

Following recent Intel chip bugs I upgraded my Debian Stretch server. Microcode updated OK, but update-initramfs was hanging. So I killed it and tried to remove the kernel before trying to reinstall ...
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116 views

Rescue an unbootable Bionic system which uses LVM but can't find its volumes

I currently have a Bionic Xubuntu machine which has a boot partition and an LVM partition containing a LUKS-encrypted system. It doesn't boot because xubuntu--vg-root does not exist (i.e. it isn't ...
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813 views

Upgraded 14.04 to 16.04 and boot is dropping to initramfs prompt

Anyone know how to fix this? I upgraded a system with LVM partitions for /, /var, /usr, /home and it seems like initrd can't figure out the LVM scheme. I found a bugreport on launchpad regarding this ...
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24 views

Read hostname from a secondary filesystem

I'm trying to customize a preinstalled Ubuntu image for VM instances. My idea was to add a secondary filesystem to /etc/fstab (let's call it /config) and then symlink all relevant config files to that ...
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4answers
2k views

Ubuntu full disc encryption on Hetzner Cloud adding add static route in initramfs

I try to setup Ubuntu with full disc encryption on top of Hetzner Cloud. I got everything to work except the network connection in initramfs. Thanks to the UI console its possible to unlock, but I ...
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1answer
509 views

How to make initrd of Ubuntu 16.04 mount /home automatically in addition to /?

This is a follow-up to a former question about systemd, BTRFS, /home being an individual subvolume and the following restriction of systemd I would like to work around: The file system where the ...
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2answers
833 views

Static route in initramfs

My hosting provider unfortunately requires the use of static routes for network configuration (gateway is on a different subnet than the host IP). For that purpose I added the following lines to the ...
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1answer
695 views

mkinitramfs failed to determine device for /

I'm following this tutorial : Create a Custom Debian Live (it's not the first time) but this time it doesn't work when I'm trying to install linux-image-amd64 live-boot systemd-sysv in chroot ...
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2answers
12k views

CentOS7 Dracut lvm command not found

I updated CentOS7 kernel because of Meltdown issue from 3.10.0-693.11.1 to 3.10.0-693.11.6, but after that update, I cannot boot as centos drop to the dracut with error warning /dev/mapper/centos-...
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1answer
3k views

cpio incorrectly unpacking initrd in Ubuntu Xenial

I am trying to unpack initrd image: # file /boot/initrd.img-4.11.0-14-generic /boot/initrd.img-4.11.0-14-generic: ASCII cpio archive (SVR4 with no CRC) # mkdir /tmp/initrd; cd /tmp/initrd # cpio -i -...
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463 views

LVM error causing fall back to initramfs on boot after ubuntu upgrade

I've recently updated Ubuntu from an older LTS release (12.04) to 14.04 LTS and upon reboot, ubuntu fails to load and an error in /sbin/lvm is shown: There appears to be one or more degraded LVM ...
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1answer
552 views

Can't send password to scp prompt during boot

I have Ubuntu OS with encrypted partition. During boot, I want to download keyfile from remote server using scp and use it to decrypt partition. What I did: /etc/initramfs-tools/hooks/myhook.sh #...
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624 views

Ubuntu: updated mainline kernel, now drops to initramfs

I attempted to upgrade our system's mainline kernel and am now dropping into initramfs. < update>: The commands I used were: apt-get update apt-get upgrade apt-cache search linux-image //grabbed ...
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1answer
1k views

Introspection of initramfs systemd services - How?

Background I'm running ArchLinux, using the systemd binary to start necessary services as part of the initramfs (root fs decryption, mounting etc.). I would like to examine what systemd units are ...
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1answer
51 views

System boots to initrmafs prompt after rdiff-backup restore

I was making daily backups with rdiff-backup. system and data partitions separately. Now I restored the system from the backup, but it doens't boot. All I get is an (initramfs) prompt. I typed echo $...
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1answer
727 views

NFS /sbin/init with Qemu without initrd

TL;DR : I try to tell my kernel on a Qemu machine to start /sbin/init from an NFS server but I have a kernel panic (not syncing: VFS: Unable to mount root fs on unknown-block(2,0)). I used the ...
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1answer
146 views

Mount and copy /var to EC2 instance store during first boot

I'm running EC2 EBS images on instances with instance stores on /dev/xvdb and /dev/xvdc. I have managed to create a script to raid these two drives on first boot and mount them as /mnt. What I really ...
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2answers
3k views

Linux diskless boot - NFS share not mounting during ramdisk boot

(This is my first post so hopefully I'm formatting it correctly). I've added in as much information as possible without being TL:DR. My basic issue is that I hit walls when trying to do a PXE ...
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1answer
2k views

PXE boot kernel panic

I am having trouble setting up a PXE boot server. I've got isc-dhcp-server running, tftp-hpa serves the files over tftp (verified works), and apache2 hosts the rootfs image. The PXE client seems to ...
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1answer
193 views

Ubuntu ramdisk template

I've been working on a ramdisk template for running a complete root filesystem on the RAM of a baremetal server(over IPMI so no physical access) that boots over PXE. I used debootstrap to create an ...
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1answer
729 views

Simpler way to add eth0 support in initrd.img (Centos)

I am trying to deploy clone image via pxeboot on hard disk. For this I want to use dd tool. I am aware that there are few tools like fog and clonezilla which does similar thing but this is university ...
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1answer
834 views

Linux server — verifying bootability of initramfs image

how does one verify the bootability of initramfs image without actually rebooting the system -- the reason why we need this is - suppose if one takes the system for a short window and suddenly finds ...
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171 views

switch_root not included in initramfs image

After upgrading the kernel via yum to the latest version the initramfs image file is missing the switch_root binary from the /sbin/ folder. This causes the machine to not boot, from this kernel. ...
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1answer
2k views

To write in mdadm.conf in initramfs prompt doesn"t not save changes after reboot

I made a mistake with my mdadm.conf with my debian backup server. I used this command : mdadm --detail --scan --verbose >> /etc/mdadm/mdadm.conf to add a raid5 (it works great). By using ...
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1answer
425 views

mkinitrd to preload virtualBox LSI SAS storage drivers [closed]

I am trying to compile my own kernel (2.6.9). Everything works on the compilation and building end, but... After rebooting to the new kernel - the LVM (VolumeGroup00) cannot be loaded. My suspicious ...
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1answer
898 views

grub2/initramfs disaster recovery

One of my ubuntu 12.04 is a vm on vmware ESXi host. It has separate boot and root partition. One developer did fsck on the live root partition by mistake and this vm can only boot to initramfs mode ...
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2answers
18k views

Server won't boot, kernel panic - not syncing

After a reboot of a CentOS 6.2 server we are getting a kernel panic with the following error: Kernel panic - not syncing: Attempted to kill init! Panic occurred, switching back to text console When ...
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1answer
2k views

Booting a diskless Debian system using bonding, bridging, and iSCSI

I'm trying to build my personal holy grail: booting my Debian Wheezy KVM server diskless from a iSCSI target and the only configuration needed on the diskless server is the iSCSI parameters in the NIC ...
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1answer
779 views

Initrd and Initramfs

I have read about the differences between the two from stackoverflow. But I am still finding it difficult to understand tmpfs and the real advantages of initramfs over initrd. I find that on RedHat ...
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0answers
64 views

What to use as an installer bootstrap?

I've got some embedded systems which I'd like to deploy a debootstrap-prepared Ubuntu rootfs to. But I need some kind of a stub which I can use to boot these systems, either via USB or PXE. Basic ...
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2answers
3k views

System does not boot from root LVM RAID1 partition when any of the underlying PV is missing

I have LVM RAID 1 (not mdadm RAID 1, but exactly LVM2 RAID 1) for my root partition. I would like to make my system boot without either of the HDDs where the underlying PVs of the root LVM partition ...
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1answer
327 views

RAID-5 array being split on reboot (ubuntu)

I've set up a RAID-5 array on Ubuntu 13.04 (kernel 3.8.0-27-generic) using mdadm - v3.2.5 - 18th May 2012. It appears to work fine and be in high spirits: $ cat /proc/mdstat Personalities : [linear]...
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1answer
413 views

Initramfs failure, Ubuntu 10.10 32bit during boot [closed]

I am getting initramfs error. I found Ubuntu server won't boot, stops at initramfs link on ServerFault. But the solution didn't worked for me. Please suggest the solution. Any help would be ...
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2answers
849 views

Ubuntu Server 12.10: set up network bridge in the initramfs pre-boot environment

In this scenario, I have a machine that boots its root volume off of iSCSI, and it only has a single network interface. If network configuration is done the normal way, then taking the interface down ...
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1answer
921 views

Linux initramfs read-only

In a Linux system consisting of a bootloader, the kernel and an initramfs (no block devices, no other root filesystem): Is it possible to make the initramfs read-only once expanded into memory?
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1answer
1k views

Changing boot device in initramfs on the fly?

I try to boot a XEN VM and it looks like the hard drive naming changed from /dev/sda1 to /dev/hda1. So the boot process drops me to a busy box in initramfs. How can I specify the probably right boot ...
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1answer
2k views

NFS-Root not working when booting over PXE

I am desperately trying to get a diskless client running over PXE-Boot using a NFS-Share as a root file system. I did this before some years ago but for some reason I am stucked at this since days. ...
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1answer
2k views

Rackspace Ubuntu 12.04 server stuck in initramfs after kernel upgrade

Can't boot after I did a aptitude full-upgrade and let it update menu.lst (did a diff first and it looked good). This is what I've done so far in the BusyBox shell: mkdir /tmp/xvda1 mount /dev/xvda1 ...
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1answer
344 views

Possible to use /dev/mapper in custom initrd (CentOS/RHEL)?

I'm attempting to setup a mapper device prior to boot as it requires use of my /var partition which is relied heavily upon startup. My issue is it's seemingly failing and not providing any output - ...