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  1. #1

    How to modify initrd.img

    I have an application which runs in offline mode(machine boot from product CD & app runs). That product CD has customized RHEL kernel.which doesn't have SSH package/binaries/libraries. I have to embed this package with the CD so that i can connect that target system remotely.
    For that purpose, i want to modify initrd.img kernel image file & but the mounted directory of this image file wouldn't be able to accomodate all the binaries/libraries of ssh.( error: ..files couldn't copy: no more space left on the device)

    So, I tried to create new initrd.img & copied all the existing files of old initrd.img alng with the new ssh package. I followed the following steps:

    dd if=/dev/zero of=initrd bs=1024 count=100000
    losetup /dev/loop3 initrd
    mkfs.ext3 /dev/loop3 mkfs -t ext2 /dev/loop3
    mount /dev/loop3 /mnt
    cp -dpR newInitrdfiles/* /mnt/
    umount /mnt
    losetup -d /dev/loop3
    gzip -9 initrd
    mv initrd.gz initrd.img

    But with this new image, the system is not booting up.
    It is throwing the following error:-
    INIT: running level 3
    INIT: no more processes in this run level.

    I am very much sure that this problem occurs due to new initrd.img file only.

    So how can i modify initrd.img or create new initrd.img file, so that i can embed this package into the product CD?
    So please, can any one help me out?
    Thanks in advance.

  2. #2
    Linux Engineer b2bwild's Avatar
    Join Date
    Jul 2008
    Behind You!
    there is
    command for creating initrd images

    man it for options

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