Table of Contents

geninitrd

Initial ramdisk used mostly only to mount root filesystem.

Generation

Check available kernels (Example: section): 

# geninitrd

Regenerate (adding -v to see details) as suggested in above examples: 

/sbin/geninitrd -f --initrdfs=initramfs /boot/initrd-KERVER.gz KERVER

Debbugging

Getting shell just after initrd boot ends/fails: Edit /etc/sysconfig/system , set: 

RUN_SULOGIN_ON_ERR=no

Add 

debugrd=sh

to kernel boot options (by editing /boot/grub/grub.cfg or adding to GRUB_CMDLINE_LINUX_DEFAULT in /etc/sysconfig/grub and running update-grub)

Reboot. HINT: CTRL+PgUp/PgDown scrolls initrd logs.

Checking generated initrd image

Uncompressing initrd, copy first, ungzip, uncpio: 

cp /boot/initrd.*.gz  /root/geninitrd
gunzip  initrd-4.1.15-1.gz
cpio -idmv < initrd-4.1.15-1

or have lesspipe, file installed and use less: 

# less /boot/initrd-2.6.38.8-1.gz