Hacker News Reader

Comment by stuff4ben | Hacker News Reader

It would be nice to know how OpenShift deviates from vanilla Kubernetes in terms of security and best practices. I used kubeadm to install my K8s PoC cluster and from what I've read it utilizes best practices for a "reasonably secure" installation. https://kubernetes.io/docs/setup/independent/create-cluster-...

View on HN

Kubeadm does set up a few security features as long as its a fairly recent version. There are others you still need to configure and/or enable if you need them. (eg NetworkPolicies, OIDC, Encrypted data at rest, etc, etc.) I don't see openshift setting many of these either.

Well first of all OpenShift enforces that no pods can run as root. That's a pretty big deviation from vanilla Kubernetes right out of the box.

I was wondering how they enforce it.

>OpenShift runs whichever container you want with a random UUID, so unless the Docker image is prepared to work as a non-root user, it probably won't work due to permissions issues.

Source: https://engineering.bitnami.com/articles/running-non-root-co...

It’s not quite random. Every namespace gets assigned a unique block of 10k UIDs and the default container UID is the first in the block for all unprivileged users. Granting access to a higher powered PSP (actually a security context constraint which was the basis for PSP) changes the defaulting.

It's enforced with a default PodSecurityPolicy, which describes the attributes/capabilities that containers can have on the cluster.

Reply on news.ycombinator.com