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this post was submitted on 03 Nov 2023
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Could you detail how you would do this? Especially since the containers in my case do not support HTTPS (they do not have the libraries compiled, if I'm not wrong).
Thank you for the clarification. I do not think I'll be running malicious containers inside my pods, but I would like to contain unencrypted traffic as much as possible. Running an RP for every pod seems doable and since I reach containers through their loopback address inside the pod, this is reasonably safe for my use-case too.
Could you confirm if one can reach one's containers on the loopback address in a separate network namespace on podman? I was wondering about the differences between a pod and a network namespace on podman, and so far the only mention of something like this is that containers in pods share a "security context". I don't know enough to understand what this is since I haven't read about pods in Kubernetes.
Thanks, I was planning to use Ansible too.
I would re-read all docs about podman networking, different network modes, experiment with systemd
PrivateNetworkoption, 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, ...
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!
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.
No, they can't, that's the point of namespaces.
Even if containers from different pods are put in an arbitrary namespace?
Ex:
Will they be able to connect via loopback?