Excercise A.3 33 review6.yaml: error: unable to upgrade connection: container not found ("webguy")

I don't know how to log into an unstarted container, but since the error for me was at startup regarding the mkdir of folders due to lack of permissions (as seen from kubectl logs) I harnessed the yaml as follows to pre-provide the temp folders and the nginx container now goes in Running.

apiVersion: v1
kind: Pod
metadata:
  name: securityreview
spec:
  securityContext:
    runAsUser: 2100
  volumes:
    - name: nginx-dir
      emptyDir: {}
    - name: nginx-empty
      emptyDir: {}
    - name: nginx-run
      emptyDir: {}
  containers:
    - name: webguy
      image: nginx
      volumeMounts:
        - mountPath: /etc/nginx/conf.d/
          name: nginx-dir
        - mountPath: /var/cache/nginx/client_temp
          name: nginx-empty
        - mountPath: /var/run/
          name: nginx-run
      securityContext:
        runAsUser: 3000
        allowPrivilegeEscalation: false

@guettli did you find any solution to this problem.