Please refer to Redhat disk mod for complete information. That page will eventually replace this page.
Unpacking an initrd
# Make and change to a temporary directory mkdir /tmp/initrdtesting cd /tmp/initrdtesting # Grab an initrd you want to work with cp /boot/initrd.img . # Rename the initrd mv initrd.img initrd.ext2.gz # Unzip the initrd gunzip initrd.ext2.gz # Create a blank directory to mount the initrd to mkdir initrd.dir # Mount the initrd filesystem mount initrd.ext2 initrd.dir -o loop # Investigate your initrd cd initrd.dir |
Inspecting the initrd
When initrd boots, it immediately runs /linuxrc
SCSI modules are located in the /lib directory
bin
insmod
sash
dev
console (5,1)
null (1,3)
ram (1,1)
systty (4,0)
tty1 (4,1)
tty2 (4,2)
tty3 (4,3)
tty4 (4,4)
etc
lib
ncr53c8xx.o
linuxrc
loopfs
Contents of linuxrc #!/bin/sash aliasall echo "Loading ncr53c8xx module" insmod /lib/ncr53c8xx.o |
Repacking the initrd