this post was submitted on 23 Jul 2023
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44
Docker Container/Service with Same Port: Best Practices? (lemmy.dbzer0.com)
submitted 1 year ago by EliteCow@lemmy.dbzer0.com to c/selfhosted@lemmy.world
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I am very new to using docker. I have been used to using dedicated VM's and hosting the applications within the servers OS.

When hosting multiple applications/services that require the same port, is it best practice to spin up a whole new docker server or how should I go about the conflicts?

Ie. Hosting multiple web applications that utilize 443.

Thank you!

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[–] d_k_bo@feddit.de 1 points 1 year ago (1 children)

That wouldn't work if multiple containers use the same port (eg. 8000), right?

Without a docker network, I can just map 8001:8000 and don't have that issue.

[–] aguslr@lemmy.sdf.org 4 points 1 year ago (1 children)

Yes, it'd work just fine because each container listens on port 8000 of their own IP address, not the docker server's IP address. Caddy/Traefik just redirects traffic to that port.

[–] d_k_bo@feddit.de 1 points 1 year ago (1 children)

Okay, thanks! Maybe I'll try it in the future.

[–] herrfrutti@lemmy.world 1 points 1 year ago* (last edited 1 year ago)

I've just posted a little example. I'd recommend doing it this way. No more thinking about what port is allready exposed etc