hi, I have try create 'initrd.img' under a fedora 20 with 'dracut-037-11':

    # rpm -qa|grep dracut
    dracut-config-rescue-037-11.git20140402.fc20.x86_64
    fedup-dracut-plymouth-0.8.0-2.fc20.noarch
    dracut-config-generic-037-11.git20140402.fc20.x86_64
    fedup-dracut-0.8.0-2.fc20.x86_64
    dracut-tools-037-11.git20140402.fc20.x86_64
    dracut-network-037-11.git20140402.fc20.x86_64
    dracut-037-11.git20140402.fc20.x86_64
   
but it also noticed: dracut module 'livenet' cannot be found or installed.
   
    # dracut -v --force -a "livenet" initrd0.img 2.6.32-431.29.2.el6.x86_64
    Kernel version 2.6.32-431.29.2.el6.x86_64 has no module directory /lib/modules/2.6.32-431.29.2.el6.x86_64
    Executing: /usr/sbin/dracut -v --force -a livenet initrd0.img 2.6.32-431.29.2.el6.x86_64
    03modsign: Could not find command 'keyctl'!
    05busybox: Could not find command 'busybox'!
    90btrfs: Could not find command 'btrfs'!
    90crypt: Could not find command 'cryptsetup'!
    90dmraid: Could not find command 'dmraid'!
    99img-lib: Could not find command 'tar'!
    dracut module 'livenet' depends on 'img-lib', which can't be installed
    90lvm: Could not find command 'lvm'!
    90mdraid: Could not find command 'mdadm'!
    90multipath: Could not find command 'multipath'!
    91crypt-gpg: Could not find command 'gpg'!
    95cifs: Could not find command 'mount.cifs'!
    95fcoe: Could not find command 'dcbtool'!
    95fcoe: Could not find command 'fipvlan'!
    95fcoe: Could not find command 'lldpad'!
    95fcoe-uefi: Could not find command 'dcbtool'!
    95fcoe-uefi: Could not find command 'fipvlan'!
    95fcoe-uefi: Could not find command 'lldpad'!
    95iscsi: Could not find command 'iscsistart'!
    95iscsi: Could not find command 'iscsi-iname'!
    95nbd: Could not find command 'nbd-client'!
    95nfs: Could not find any command of 'rpcbind portmap'!
    97biosdevname: Could not find command 'biosdevname'!
    dracut module 'livenet' cannot be found or installed.
    dracut module 'img-lib' cannot be found or installed.
    dracut module 'img-lib' cannot be found or installed.
    dracut module 'livenet' cannot be found or installed.
    dracut module 'img-lib' cannot be found or installed.
    dracut module 'img-lib' cannot be found or installed.
    *** Including module: bash ***
    *** Including module: i18n ***
    *** Including module: network ***
    *** Including module: ifcfg ***
    ...