Comment by saurik

Yeah, so to run your own Optimism full node--the "whole stack"--you need 1) a normal Ethereum full node of some kind, 2) an Optimism data-transport-layer service (which scrapes the L1 looking for L2 transactions and provides a web service to access just that data), and then 3) an Optimism l2geth instance (which is an Ethereum node modified to read its transaction batches from the DTL).