updated README-dracut.md

1 files changed, 55 insertions, 7 deletions

diff --git a/README-dracut.md b/README-dracut.md
index bdbe718..9eb7664 100644
--- a/README-dracut.md
+++ b/README-dracut.md
@@ -9,12 +9,21 @@ Requirements
 
 To compile and use yubikey full disk encryption you need:
 
-[...]
+* libyubikey-devel
+* ykpers-devel
+* iniparser-devel
+* libarchive-devel
+* cryptsetup-devel
+* python-markdown
+* systemd-devel
 
 Build and install
 -----------------
 
-Building and installing is very easy. Just run:
+Building and installing is very easy. Make sure you have a Softlink from markdown to markdown_py
+> ln -s /bin/markdown_py /bin/markdown
+
+Just run:
 
 > make
 
@@ -28,10 +37,12 @@ Usage
 -----
 
 Make sure systemd knows about your encrypted device by
-adding a line to `/etc/crypttab.initramfs`. It should read like:
+adding a line to `/etc/crypttab`. It should read like:
 
 > `mapping-name` /dev/`LUKS-device` -
 
+Normally, there is already an entry for your device.
+
 Update `/etc/ykfde.conf` with correct settings. Add `mapping-name` from
 above to `device name` in the `general` section. Then add a new section
 with your key's decimal serial number containing the key slot setting.
@@ -56,10 +67,47 @@ This will store a challenge in `/etc/ykfde.d/` and add a new slot to
 your LUKS device. When `ykfde` asks for a password it requires a valid
 password from available slot.
 
-[...]
+Build the dracut:
+
+> dracut -f
+
+Now you have two choices. If you want, that the challenges are updated every boot, go on. else stop here.
+
+### change challenges on boot
+
+To change the challenges every boot it takes too long to generate whole new initramfs. So we load an additional initram with the bootloader.
+
+Build the cpio archive with the challenges:
+
+> ykfde-cpio
+
+Setup your bootloader with the the additional initram '/boot/ykfde-challenges.img'
+
+#### Setup GRUB2
+
+For ex. change /boot/grub2/grub.cfg
+
+    initrd /initramfs-3.10.0-123.13.2.el7.x86_64.img
+
+to
+
+    initrd /initramfs-3.10.0-123.13.2.el7.x86_64.img /ykfde-challenges.img
+
+
+with EFI /boot/efi/../grub.cfg
+
+    initrdefi /initramfs-3.17.7-300.fc21.x86_64.img
+
+to
+
+    initrdefi /initramfs-3.17.7-300.fc21.x86_64.img /ykfde-challenges.img
+
+### enable service
+
+Enable `systemd` service `ykfde-cpio.service`. it generate every boot a new challenge and updates the initram `ykfde-challenges.img` and the LUKS passphrase.
+
+*Be carefully:* Do not enable if you haven't setup the bootloader with the ykfde-challenges.img. If you do, you have to rebuild with dracut manually every time the service is executed.
+
 
-Additionally enable `systemd` service `ykfde-cpio.service` and make your
-bootloader load the new `cpio` image `/boot/ykfde-challenges.img` (in
-addition to your usual initramfs).
 
 Reboot and have fun!