Getting exit code from the application running in a container (kubernetes)

I am trying to get the exit from the application running in a kubernetes cluster. I can see the pod status as Error but I am interested in getting the exact exit code.

Docker File:

# getting base image 
FROM mcr.microsoft.com/windows/servercore:ltsc2019

# Copy powershell scripts
COPY scripts/ scripts/

# copy app
COPY app/ app/

# run script 
ENTRYPOINT ["powershell", "C:\\scripts\\myscript.ps1"]

myscript.sp1:

# Run script 1
Invoke-Expression "& `"C:\\scripts\\myscript1.ps1`" "

# Run script 2
Invoke-Expression "& `"C:\\scripts\\myscript2.ps1`" "


#Invoke exe
Invoke-Expression "& `"C:\app\MyApp.exe`" "

# Write Exit Code
Write-Host $LASTEXITCODE

Write-Host "Exit with Exit Code"

exit $LASTEXITCODE

On error, I can see the pod status as 'Error' but I need to get the exact exit code returned from myscript.ps1. I can see the exit code when I look at the Pod's log but I don't see it in the container exit code.

I have also tried this How to start container with kubectl and get exit code back? without kubectl exec But getting status as true or false

kubectl run myjob4 -it --restart=Never --image=myacr.azurecr.io/myapp:v1 --restart=Never --overrides='"{\"apiVersion\":\"v1\",\"spec\":{\"nodeSelector\":{\"kubernetes.azure.com/os-sku\":\"Windows2019\",\"kubernetes.io/os\":\"windows\"}}}"'

Output:

10 Exit with Exit Code pod default/myjob5 terminated (Error)

output:

False

Instead of false, how can I get the exit code of 10 ( in this case ) ?

Solution

Only the -File parameter of the PowerShell CLI (powershell.exe for Windows PowerShell, pwsh for PowerShell (Core) 7+) passes a script file's exit code through as-is, and using -File is the proper way to invoke a script file.

powershell.exe defaults to the -Command CLI parameter (whereas pwsh defaults to -File), and it only reports an abstract exit code by default, namely 0 if the last statement executed succeeded, and 1 otherwise. See this answer for details.

Therefore, use the following in your Dockerfile:

# run script 
ENTRYPOINT ["powershell", "-File", "C:\\scripts\\myscript.ps1"]

Two asides:

Invoke-Expression (iex) should generally be avoided; except in unusual circumstances, don't use it to invoke an external program or PowerShell script / command.
\ characters have no special meaning to PowerShell, so you never need to escape them as \\ (PowerShell's escape character is `, the so-called backtick).

Therefore, use the following in your PowerShell script:

# Alternatively, simply:
#  C:\scripts\myscript1.ps1 
& "C:\scripts\myscript1.ps1"

# Run script 2
& "C:\scripts\myscript2.ps1"

#Invoke exe
& "C:\app\MyApp.exe"

# ...

exit $LASTEXITCODE