Newbie questions: how to configure and mount an encrypted partition on bootup?

[David Li <w.david.li@xxxxxxxxx>]

      Hi,
        I am totally new to dm-crypt. My OS is RHEL5/6.

        Here is what I want to do:

        I have a system that is pxebooted and the root fs is nfs mounted from 

another server.  But I have a local disk that can be used as an encrypted 

storage perhaps for user data.  In the beginning it's blank with no partitions.

        So the first time I would let the user to decide how to partition and 
set up LUKS.  From that point on each subsequent boot would automatically mount the encrypted partitions as configured.

        I am looking for general programmable way  to achieve this. Maybe 
someone has done the exact thing before.

        Specifically,
      1.      On first boot, how should I modify the initramfs to prompt the 
user to set up LUKS? Or initramfs is not the way, what else?

        2.      On each subsequent boot, how would I let dm-crypt to 
automatically retrieve the passphrase once the user logins into the system. Assume that the passphrase has been stored on the same server to store the root fs. I don't want to force him to type in the LUKS passphrase again to unlock the partitions.
        Thanks.
        David

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