ironic deploy initramf生成

30 # on RHEL pci.ids is locate on /usr/share/hwdata/pci.ids.
 31 sudo find . -xdev \
 32     -path './sys/*' -prune -o \
 33     -path './tmp/*' -prune -o \
 34     -path './boot/*' -prune -o \
 35     -path './root/.cache' -prune -o \
 36     -path './usr/include/*' -prune -o \
 37     -path './usr/lib/locale/*' -prune -o \
 38     -path './usr/share/doc/*' -prune -o \
 39     -path './usr/share/man/*' -prune -o \
 40     -path './usr/share/info/*' -prune -o \
 41     -path './usr/share/licenses/*' -prune -o \
 42     -path './usr/share/misc/m*' -prune -o \
 43     -path './usr/src/kernels/*' -prune -o \
 44     -path './var/cache/*' -prune -o \
 45     -name '*.pyc' -prune -o \
 46     -name '*.pyo' -prune -o \
 47     -print | sudo cpio -o -H newc | ${DIB_IPA_COMPRESS_CMD} > ${IMAGE_PATH}.initramfs
 48 
 49 select_boot_kernel_initrd $TARGET_ROOT
 50 sudo cp $BOOTDIR/$KERNEL ${IMAGE_PATH}.kernel
 51 sudo chown $USER: ${IMAGE_PATH}.kernel

解压

Use the file command on the initramfs/initrd to identify the compression format:

file /boot/initramfs-$(uname -r).img

The $(uname -r) will use the file for the current kernel version. You may also specify a specific file, such as:

file /boot/initramfs-2.6.32-754.el6.x86_64.img

The most common is a gzip-format image which displays as:

# file /boot/initramfs-$(uname -r).img
/boot/initramfs-2.6.32-754.el6.x86_64.img: gzip compressed data

However, there may also be an XZ/LZMA-format image which displays as:

# file /boot/initramfs-$(uname -r).img
/boot/initramfs-2.6.32-754.el6.x86_64.img: LZMA compressed data

Select the appropriate instructions below to extract or repack the correct image type for your system.

gzip format - Extract / Uncompress

Uncompress and extract the contents of the image in the /boot/ directory:

zcat /boot/initrd-$(uname -r).img | cpio -idmv

gzip format - Repack / Recompress

Still in the working directory, find all files and add them to a new boot image file:

find . | cpio -o -c | gzip -9 > /boot/new.img

xz/LZMA format - Extract / Uncompress

Uncompress and extract the contents of the image in the /boot/ directory:

xz -dc < /boot/initrd-$(uname -r).img | cpio -idmv

xz/LZMA format - Repack / Recompress

Still in the working directory, find all files and add them to a new boot image file:

find . 2>/dev/null | cpio -c -o | xz -9 --format=lzma > /boot/new.img

1、 file命令查看centos8-deploy.initramfs格式

2、 zcat centos8-deploy.initramfs | cpio -idmv

3. chroot

1. Get Initrd.img from ISO
mkdir /mnt/{image,work}
mount -o loop RHEL6.5-server.x86_64.iso /mnt/image/
cp /mnt/image/isolinux/initrd.img /mnt/work
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mkdir /mnt/{image,work}
mount -o loop RHEL6.5-server.x86_64.iso /mnt/image/
cp /mnt/image/isolinux/initrd.img /mnt/work
 2. Extract Initrd.img
Before extract rename initrd.img to initrd.img.xz because its compressed with xz and will remove its extension and rename again with initrd.img

cd /mnt/work
mkdir initrd-new
mv initrd.img initrd.img.xz
xz --format=lzma initrd.img.xz –decompress
cd initrd-new
cpio -ivdum < ../initrd.img

cd /mnt/work
mkdir initrd-new
mv initrd.img initrd.img.xz
xz --format=lzma initrd.img.xz –decompress
cd initrd-new
cpio -ivdum < ../initrd.img
 3. Copy Required Driver
I will used already installed chelsio driver from chelsio script. We were using same directory tree,

cp  /lib/modules/2.6.32.431.el6.x86_64/updates/drivers/ /mnt/work/initrd-new/modules/2.6.32.431.el6.x86_64/updates/
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cp  /lib/modules/2.6.32.431.el6.x86_64/updates/drivers/ /mnt/work/initrd-new/modules/2.6.32.431.el6.x86_64/updates/
 4. Update driver information from modules.* to initrd.img modules.* files.
I will used chelsio driver information here and it can be different for you. You need to confirm which hardware driver you will used to insert in initrd.img and its information from modules.* files.

cd /lib/modules/2.6.32.431.el6.x86_64/
egrep 'cxgb4|toecore|t4_tom' modules.symbols &nbsp;>> /mnt/work/initrd-new/modules/2.6.32-431.el6.x86_64/modules.symbols
egrep 'cxgb4|toecore|t4_tom' modules.alias >> /mnt/work/initrd-new/modules/2.6.32-431.el6.x86_64/modules.alias
egrep 'cxgb4|toecore|t4_tom' modules.dep >> /mnt/work/initrd-new/modules/2.6.32-431.el6.x86_64/modules.dep

cd /lib/modules/2.6.32.431.el6.x86_64/
egrep 'cxgb4|toecore|t4_tom' modules.symbols &nbsp;>> /mnt/work/initrd-new/modules/2.6.32-431.el6.x86_64/modules.symbols
egrep 'cxgb4|toecore|t4_tom' modules.alias >> /mnt/work/initrd-new/modules/2.6.32-431.el6.x86_64/modules.alias
egrep 'cxgb4|toecore|t4_tom' modules.dep >> /mnt/work/initrd-new/modules/2.6.32-431.el6.x86_64/modules.dep
5. Generate modules.*.bin files inside initrd.img
This will recreate all modules.*.bin files using required driver information using modules.* files. This required because without this initrd.img will unable to load newly inserted driver.

chroot /mnt/work/initrd-new
depmod -a -v
exit

chroot /mnt/work/initrd-new
depmod -a -v
exit
6. Generate updated Initrd.img
cd /mnt/work/initrd-new
find . -print |cpio -o -H newc | xz --format=lzma > ../initrd.img

cd /mnt/work/initrd-new
find . -print |cpio -o -H newc | xz --format=lzma > ../initrd.img
Your initrd.img is ready and you can used this new initrd.img to replaced stock initrd.img to start kickstart installation or network boot.

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https://www.cnblogs.com/ssslinppp/p/5945537.html

原文地址：https://www.cnblogs.com/dream397/p/12706634.html