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Mutating webhooks all run in a functionally random order, then validating webhooks all run concurrently after that.

You shouldn't use PodSecurityPolicy on Azure AKS cluster as it has been set for deprecation as of May 31st, 2021 in favor of Azure Policy for AKS. Check the official docs for further details:

Warning

The feature described in this document, pod security policy (preview), is set for deprecation and will no longer be available after May 31st, 2021 in favor of Azure Policy for AKS. The deprecation date has been extended from the previous date of October 15th, 2020.

So currently you should rather use Azure Policy for AKS, where among other built-in policies grouped into initiatives (an initiative in Azure Policy is a collection of policy definitions that are tailored towards achieving a singular overarching goal), you can find a policy which goal is to disallow running of privileged containers on your AKS cluster.

As to PodSecurityPolicy, for the time being it should still work. Please check here if you didn't forget about anything e.g. make sure you set up the corresponding ClusterRole and ClusterRoleBinding to allow the policy to be used.

I was able to reproduce your scenario but using Helm.

Original Replication Steps to create 2 Nginx Ingress in one Cluster

Create two namespaces for development: dev1, dev2 and two for ingress: ing1, ing2.

It's kind of related to how the user is authenticated to the cluster and how they get a kubeconfig file.You can put a group in the client certificate or the bearer token that kubectl uses from the kubeconfig. Ahead of time you can define a clusterrole having a clusterrolebinding to that group which gives them permission to certain verbs on certain resources(for example ability to create namespace)

Additionally you can use an admission webhook to validate if the user is supposed to be part of that group or not.

This is a confirmed bug in Postman when both the callback_uri and the token OAuth server endpoints are on the same (localhost) domain.

• https://github.com/postmanlabs/postman-app-support/issues/7105

First of all:

$ kubectl run --name=nginx hello-world

You did not specify image name of the pod. Correct syntax should be:

$ kubectl run --image=nginx NAME_OF_DEPLOYMENT

As said above commands will try to create a deployment.

The issue you are encountering is most probably connected with:

• Not working/turned on admission controller

On newly created Kubernetes cluster with pod security policy turned on you should not be able to spawn any pod regardless of your privileges.

Pod security policy control is implemented as an optional (but recommended) admission controller. PodSecurityPolicies are enforced by enabling the admission controller, but doing so without authorizing any policies will prevent any pods from being created in the cluster.

-- Kubernetes.io: enabling pod security policies

Admission controller as well as pod security policy and RBAC are strongly connected with solutions you are working with. You should refer to documentation specific to your case.

For example:

• Newly created GKE cluster with pod security enabled and none PSP configured will not create pods. It will display a message: Unable to validate against any pod security policy: []

Warning: If you enable the PodSecurityPolicy controller without first defining and authorizing any actual policies, no users, controllers, or service accounts can create or update Pods. If you are working with an existing cluster, you should define and authorize policies before enabling the controller.

-- GKE: Pod security policies and how to enable/disable it

• Newly created Kubernetes cluster with kubespray (with pod security policy variable set to true when provisioning and running on Ubuntu) will have a restrictive PSP created and it will have a MustRunAsNonRoot parameter inside the PSP.

There is another issue with NGINX pod. NGINX image will try to run as root user inside of the pod. Admission controller with PSP configured with:

As a workaround you can use standard GNU/Linux diff command in the following way: