Log bed question

I have a couple of questions that will probably seem mighty simple to you experienced folks but here goes.

1) What is the best glue to put on a mortise and tenon joint? (I will be using ceder)

2) After I assemble the head/foot board should I drill into the logs at an angle through the joint and drive in a dowel for strength?

3) I really want to make this bed so it could be disassembled, IE. rails from the head/foot boards. what would be the best way to do that?

Thanks in advance for any thoughts. Tim