How do you respond to the greeting “you alright”?

Posted by dot_zot@reddit | AskUK | View on Reddit | 72 comments

I’m obviously not native to the UK but I need to know because all of my interactions are awkward. Is it a question? Do I respond “good”? Do they want a response at all? Am I supposed to say “you alright” back? Do I usually say “good what about you”? But they do it as they walk past so there’s no time for these exchanges.