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Question on SSL traffic between podman containers and clients (should I run k3s?) (self.selfhosted)

submitted 1 year ago by MigratingtoLemmy to c/selfhosted

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Hi everyone.

I was trying to research about how to implement SSL on the traffic between my clients and the containers that I host on my server.

Basically, my plan was to use upstream SSL in HAProxy to attempt to achieve this, but in order for that to work, each individual container on my server needs to be able to decrypt SSL. I do not think that is possible and that every container has the necessary libraries for it. This puts a halt on my idea for upstream encryption of traffic from my reverse-proxy to my containers.

With that said, ChatGPT suggested I use Kubernetes with a service mesh like Istio. The idea was intriguing so I started to read about it; but before I dive head-first into using k3s (TBH it's overkill for my setup), is there any way to implement server-side encryption with podman containers and a reverse-proxy?

After writing all of this, I think I'm missing the point about a reverse-proxy being an SSL termination endpoint, but if my question makes sense to you, please let me know your thoughts!

Thanks!

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[–] vegetaaaaaaa 2 points 1 year ago* (last edited 1 year ago) (1 children)

Could you detail how you would do this?

I would re-read all docs about podman networking, different network modes, experiment with systemd PrivateNetwork option, re-read some basic about network namespaces, etc ;) I have no precise guide as I've never attempted it, so I would do some research, trial and error, take notes, etc, which is the stage you're at.

Edit: https://www.cloudnull.io/2019/04/running-services-in-network-name-spaces-with-systemd/,https://gist.github.com/rohan-molloy/35d5ccf03e4e6cbd03c3c45528775ab3, ...

Could you confirm if one can reach one’s containers on the loopback address in a separate network namespace on podman?

I think each pod uses its own network namespace [1]. You should check the docs and experiment (ip netns, ip addr, ip link, ip route...).

I think it's doable, but pretty much uncharted territory - at least the docs for basic building blocks exist, but I've never come across a real world example of how to do this. So if you go this way, you will be on your own debugging, documenting and maintaining the system and fixing it when it breaks. It will be an interesting learning experiment though, hope you can document and share the outcome. Good luck!

[–] MigratingtoLemmy 1 points 1 year ago (1 children)

Thank you, I do realise that each pod uses its own namespace. I was talking about if containers part of a different network namespace (outside of their pods) could also reach out to each other via the loopback address.

[–] vegetaaaaaaa 1 points 1 year ago* (last edited 1 year ago) (1 children)

No, they can't, that's the point of namespaces.

[–] MigratingtoLemmy 1 points 1 year ago (1 children)

Even if containers from different pods are put in an arbitrary namespace?

Ex:

pod 1 - network: pod1
pod 2 - network: pod2
Container1 and Container2 are spun up within these pods respectively, whilst also being attached to network: pod3

Will they be able to connect via loopback?