What I would like to do is start dhclient service before the system ask: "Enter LUKS passphrase:", is it possible, how?
This is certainly possibly, however it will be a little involved. The Initrd file that asks for the password is created using initramfs-tools, which uses a modular system for building the initrd. For our application, we modify one file (cryptroot) to add the delay for USB devices to be detected. As for which file you would need to modify to use dhclient, I dont know but I would start with their documentation. I'm sure someone else has needed networking during boot and figured out how.
If I using an Usb hard disk instead USB flash can I format the disk with ext3? and create swap partition?
Yes and Yes
I've been experimenting with the new Etch installer and it is pretty slick. For a standard hard drive installation, there is a lot to recommend it. You may want to test it yourself.
re: Start Aplications and partitions ext3 / swap
What I would like to do is start dhclient service before the system ask: "Enter LUKS passphrase:", is it possible, how?
This is certainly possibly, however it will be a little involved. The Initrd file that asks for the password is created using initramfs-tools, which uses a modular system for building the initrd. For our application, we modify one file (cryptroot) to add the delay for USB devices to be detected. As for which file you would need to modify to use dhclient, I dont know but I would start with their documentation. I'm sure someone else has needed networking during boot and figured out how.
If I using an Usb hard disk instead USB flash can I format the disk with ext3? and create swap partition?
Yes and Yes
I've been experimenting with the new Etch installer and it is pretty slick. For a standard hard drive installation, there is a lot to recommend it. You may want to test it yourself.
As for the swap, remember to encrypt that too!