I am trying to specify the UID and GID of the user when running a pod. 
Currently using PodSecurityContext, I can specify runAsUser with a UID 
which gets enforced but specifying GID using "supplementalGroups/fsGroup" 
does not work. For example below pod definition

apiVersion: v1
kind: Pod
metadata:
  name: busybox
spec:
  containers:
  - name: busybox
    image: busybox
    command:
      - sleep
      - "3600"
  securityContext:
    runAsNonRoot: true
    runAsUser: 1000
    supplementalGroups: [1001]
    fsGroup: 1002

results in following user information "uid=1000 gid=0(root) 
groups=1001,1002" which is OK but not ideal, as I need to specify gid other 
than root. Both docker and rkt supports specifying GID, so I am wondering 
is there any option already there to pass that info.

Regards,
Gurvinder

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