How to recover or rebuild initramfs in CentOS 7 Linux

CentOS 7 Linux boot directory, You can see contents of current initramfs in CentOS 7 Linux system with command lsinitrd example below: You might have noticed in above screenshot it is getting output of current booted kernel initramfs image, It contains combination of commands, system files and directories these are require during booting of system, Recovery or Rebuild of damaged initramfs boot

CentOS / RHEL 7 : How to extract initramfs image and edit

CentOS / RHEL 7 : How to extract initramfs image and edit/view it, by admin, In some cases you may want to extract the initramfs image file to check built-in contents, This post provides steps to extract initramfs image files for RHEL 7, Unlike previous version, on RHEL 7 using cpio command for the initramfs image file will not extract all files or will give some error, For example: # ls -la

How to Rebuild the “initramfs” with Multipath in CentOS

On CentOS/RHEL system, the initramfs contains a complete operational system which may be used for troubleshooting purposes, Occasionally, the initramfs image may get damaged as well, If this happens, you cannot boot your server into normal operational mode, To repair the initramfs image after booting into the rescue environment, you can use the dracut command, If used with no arguments, this

mkinitramfs: low-level tool for generating an initramfs

Description

initramfs-tools: an introduction to writing scripts for

mkinitramfs will automatically detect which libraries the executable depends on and copy them to the initramfs, This means that most executables, unless compiled with klibc, will automatically include glibc in the image which will increase its size by several hundred kilobytes, Including a system firmware preimage early initramfs If you need to prepend data to the initramfs image, you need

About initramfs

It will be automatically added to the initrd when running mkinitramfs, After generating the initrd, copy it to the /boot directory, Now edit /boot/grub/grub,cfg and add a new menuentry, Below are several examples, # Generic initramfs and root fs identified by UUID menuentry “LFS Dev LFS-7,0-Feb14 initrd, Linux 3,0,4” { linux /vmlinuz-3,0,4-lfs-20120214 root=UUID=54b934a9-302d-415e-ac11

制作initramfs/initrd镜像

1 mkinitramfs # mkinitramfs -o /boot/initrd,img 2,6,24-16 Note: 2,6,24-16是需要创建initramfs的kernel版本号，如果是给当前kernel制作initramfs，可以用uname -r查看当前的版本号。

centos7 initramfs解包 打包_a363344923的专栏-CSDN博客

如果你的centos安装了其他内核，例如elrepo的内核，initramfs就是标准linux的格式，我们执行file 查看initramfs的时候，就会发现是 gzip compressed data。这时候解包和打包，就不需要关心early_cpio的内容了。 解包

Centos内核升级的三种方法

在基于CentOS平台的工作过程中，难免有时需要升级或者降级内核以验证功能、调试性能或者更新整个系统。 如果从头重新编译一个内核，由于现在内核特性越来越复杂，依赖的库或者工具也不少，加之重新编译耗时不菲，了解更新内核的多种方式就显得尤为必要。

Centos 源代码以及编译过程_DragonWar%的博客-CSDN博客

Centos编译 运行一个简单的C++程序, 守护大白菜的博客, 07-27, 8224, I、准备工作, 1 一个类UNIX系统，这里选择 CentOS 7 2 安装gcc 编译 器，方法很多，一种简单的安装方式,yum install gcc-c++ 注:yum install g++ 会失败,因为没有g++这个包 安装好后显示如下: 3创建测试目录

Ramfs, rootfs and initramfs — The Linux Kernel documentation

# Licensed under GPL version 2 if [ $# -ne 2 ] then echo “usage: mkinitramfs directory imagename,cpio,gz” exit 1 fi if [ -d “$1” ] then echo “creating $2 from $1” cd “$1”; find , , cpio -o -H newc , gzip > “$2” else echo “First argument must be a directory” exit 1 fi Note , The cpio man page contains some bad advice that will break your initramfs archive if you follow it, It says “A

mkinitrd8 [centos man page]

mkinitrd 8 [centos man page] mkinitrd creates an initramfs image for the kernel with version by calling “dracut”, Important If a more fine grained control over the resulting image is needed, “dracut” should be called directly, OPTIONS, –version print info about the version -v, –verbose increase verbosity

（完美解决）linux 开机进入initramfs无法开机-百度经验

不正常关机，导致开机进入initramfs而无法开机！我不知道你们有没遇到这种情况，但是，本人被这个问题困扰了很长一段时间。