[Bug]: Document that CNI plugins must be manually installed to continue using CNI with v4.0+

[computator]

Issue Description

Using CNI networking with the latest podman (via the Kubic repository) in Ubuntu 22.04 does not work due to CNI not being installed. It seems to be missing a dependency on containernetworking-plugins, or documentation that this will need to be installed manually. Once installed everything works correctly.

Steps to reproduce the issue

Steps to reproduce the issue

1. Remove old podman from 22.04 repos
2. Install podman from Kubic
3. Run apt autoremove (may not be necessary depending on circumstances)
4. Run a container or pod

Describe the results you received

Podman fails to find the CNI plugins and errors out

Describe the results you expected

Podman runs as normal

podman info output

Podman 4.3.1 on x86_64 Ubuntu 22.04

Podman in a container

No

Privileged Or Rootless

Rootless

Upstream Latest Release

No

Additional environment details

No response

Additional information

No response

[computator]

Forgot to note that on other computers I have it works fine with netavark. I kept CNI here though because I have containers I do not want to lose via running podman system reset

[Luap99]

We only need netavark/aardvark-dns on new systems since this is the new default with 4.0, if you need cni you have to install it manually. Installing both backends by default seems undesirable to me. I am fine with documenting this but I have no idea where you would want this information?

[computator]

That seems totally reasonable to me to only have netavark as a dependency, I just wasn't sure if leaving out CNI was an oversight or intentional.

The logical place to document it to me is in the installation instructions, or if we have any, upgrade instructions, although I haven't seen any? Also probably wherever the docs discuss switching to CNI, although offhand I only recall seeing that in blog posts.

[rhatdan]

Interested in opening a PR to make this clearer?

[github-actions[bot]]

A friendly reminder that this issue had no activity for 30 days.

[computator]

Yes I can probably do this but have yet to get to it

[rhatdan]

@computator still working on this?

[computator]

Yeah, I'll see if I can get to it this weekend or something, or if someone else wanted to do it that's fine too.

[github-actions[bot]]

A friendly reminder that this issue had no activity for 30 days.

[rhatdan]

@computator Ping