this post was submitted on 12 Jul 2023
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[ELI5] What is a reverse proxy exactly and how do I use it to run several dockerized services on one machine? (self.selfhosted)
submitted 1 year ago* (last edited 1 year ago) by Solvena to c/selfhosted
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So, I have some idea on what a reverse proxy does and will be using nginx (with the neat proxy manager UI) for my setup.

However, I'm not completely clear what exactly I want it to do and how I cn use it to run different services on one machine. I'm especially unclear on the ports configuration .... tutorials will say things like "change the listening port to xxx for that service and to port yyy for the other service"

How does this work, which ports can I use and how do I need to configure the respective services?

EDIT: thanks everybody, your replies did help me a lot! I have my basic setup now up and running using portainer + nginx + fail2ban.

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[–] [email protected] 8 points 1 year ago* (last edited 1 year ago)

That one is easy ! Because in a few years (remember, you're 5), you'll be a scout ! And to collect a few dollars for your summer camp, you'll sell pastries to the neighborhood. It's easier than ever because it's 2030, and everyone can just order the pastries on your website, and pay online. All you have to do now is hop on your bike, and deliver the pastries (network connections) to your neighbors (online servers). So you grab the first package, and read the label on it:

  • Mrs. Britneak

And that's it ! You have no idea who this person is, or where they live ! So you call out your leader (DNS server):

  • Hi Mr. Leader !
  • ... (nobody ever get my UDP jokes)
  • So I got this package to deliver to mrs. Brtineak. But I don't know where she lives
  • Oh sure, let me lookup the register (zone file). Hold on for a sec... Alright, she's here: 62.644888, -160.194309

And then he hangs up immediately (this is UDP, remember?).

You write it down (local caching DNS server), and look it up. You're a scout, so you're trained to read and find GPS coordinates. You go there in a few minutes and deliver the package in time ! Mrs Britneak is happy, and you go on to the next package:

  • Mr. Tomburgh

Time to call leader again !