powershell pod failing in kubernetes cluster - powershell

Question

I need to run powershell as an container in kubernetes
I am using following deployment file sample.yaml
apiVersion: v1
kind: Pod
metadata:
name: powershell
spec:
containers:
- name: powershell
image: mcr.microsoft.com/powershell:latest
When I run kubectl apply -f sample.yaml
I get the following error on kubectl get pods
powershell 0/1 CrashLoopBackOff 3 (50s ago) 92s
I did check the log kubectl logs powershell
PowerShell 7.2.6
Copyright (c) Microsoft Corporation.
https://aka.ms/powershell
Type 'help' to get help.
PS /> ←[?1h
But when i run same image as a docker container with following command its working
docker run --rm -it mcr.microsoft.com/powershell:latest

Answer 1

If you want to keep a container for running, you should write like this yaml..
apiVersion: v1
kind: Pod
metadata:
name: powershell
spec:
containers:
- name: powershell
image: mcr.microsoft.com/powershell:latest
command: ["pwsh"]
args: ["-Command", "Start-Sleep", "3600"]
[root#master1 ~]# kubectl get pod powershell
NAME READY STATUS RESTARTS AGE
powershell 1/1 Running 0 3m32s
[root#master1 ~]# kubectl exec -it powershell -- pwsh
PowerShell 7.2.6
Copyright (c) Microsoft Corporation.
https://aka.ms/powershell
Type 'help' to get help.
PS /> date
Thu Oct 13 12:50:24 PM UTC 2022
PS />

Answer 2

The docker run the same image by allocating the interactive shell by using flag -it. So that's why the to container keeps running until you exit the command.
To achieve similar in Kubernetes you can use run command.
kubectl run -i --rm --tty power --image=mcr.microsoft.com/powershell:latest
interactive-bash-pod-within-a-kubernetes