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From my relatively basic understanding of SELinux, it seems like has a lot of powerful mechanisms for enforcing security policy, but a lackluster interface for actually showing violations or creating robust policy.
Luckily, I think there’s a lot of community work coming up to make these policies easier to write and more robust.
For example: https://github.com/dburgener/cascade
KubeArmor (https://github.com/kubearmor) makes implementing SELinux policies easy for your host / k8s workloads.
Please do checkout the project and provide your valuable feedback.
All of our policies for SElinux are Auto generated using https://github.com/accuknox/discovery-engine
Writing policies by hand is nearly impossible, error prone and that is the exact problem we are trying to solve - to make SELinux and AppArmor easy for K8s workloads and now host based workloads.
> ...anything that expects to be managing docker inside docker.
Now that's an interesting problem to have!
If you trust those tools and don't have untrusted users or untrusted code, you can sometimes just mount /var/run/docker.sock and use the VM/VPS/server's Docker directly. It is actually the approach that was used by excellent tools like Portainer, though it's also really risky as well.
Alternatively, you can try to just run Docker in Docker (DinD), which is a bit more tricky and the opinions there are split about whether to do it and when to do it: https://github.com/jpetazzo/dind
Of course, someone might also jump in and suggest that Docker is architecturally problematic (i don't care much, just want my containers to run, then again; i don't deal with untrusted code or any sort of multitenancy) and you should use Podman or another set of technologies, which is interesting advice but would necessitate other approaches.
In short, like with most technologies: Docker and OCI container in general get more messy as your requirements become more advanced. For the problems that they do solve easily (app packaging), they are pretty good, though!
> Wouldn't it be great if the man page of getaddrinfo mentioned those (mine only mentions gai.conf)
That's a huge part of the problem. Was looking for a monograph to pass on my successor that wasn't so familiar with linux - modern linux - as in systemd, docker, nssswitch, pam_homed, network-manager is penetrable but more often than not I'm just looking at the c source in github and in my 30ies, starting in my teens running linux nonstop and I'm still throwing up my hands every other day...
Add time constraints and huge unfullfilled promises (don't waste your time understanding this, just do xyz) and here we are - on the other hand it's not okay that you have to devote years of trail and error to get a comprehensive undestanding of the system.
I guess a nuclear power plant has at least a training plan and complete reference book - that still needs to be read and grokked and trained upon but modern linux is often just undestandable by reading the source if you hit a problem - for some projects like things in the freedesktop ecosystem and partly systemd even that is kind of difficult because i.e. this bug https://github.com/systemd/systemd/issues/19118 explains the problem - there is no overview documentation, no clear way to look up what's happening, not even a good way to introspect and it's several components that interact with each other fail subtly. I've chosen this one because I've also hit it, not because I want to blame systemd, which is not so bad there are much worse out there.
really? I don't mean understand how to apply a new label. I mean understand what the policies are and how they work, be able to create new ones that apply to you, and verify that the ones given to you by the distro are correct for your use. You're saying this is not hard to understand: https://github.com/SELinuxProject/refpolicy/blob/master/poli... ?
Otherwise you are blindly applying some black box.
One project in this space that looked quite promising to me is sysbox[0]. I've used them once for a gitlab runner set-up similar to what is described in their blog[1].
It's currently working great and I have not had any major crashes/incidents for at least the past 8 months.
[0]: https://github.com/nestybox/sysbox
[1]: https://blog.nestybox.com/2020/10/21/gitlab-dind.html