Using python manage.py migrate --check in kubernetes readinessProbe never succeeds - django

Question

I have a django deployment on kubernetes cluster and in the readinessProbe, I am running python, manage.py, migrate, --check. I can see that the return value of this command is 0 but the pod never becomes ready.
Snippet of my deployment:
containers:
- name: myapp
...
imagePullPolicy: Always
readinessProbe:
exec:
command: ["python", "manage.py", "migrate", "--check"]
initialDelaySeconds: 15
periodSeconds: 5
When I describe the pod which is not yet ready:
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 66s default-scheduler Successfully assigned ... Normal Pulled 66s kubelet Successfully pulled image ...
Normal Created 66s kubelet Created container ...
Normal Started 66s kubelet Started container ...
Warning Unhealthy 5s (x10 over 50s) kubelet Readiness probe failed:
I can see that migrate --check returns 0 by execing into the container which is still in not ready state and running
python manage.py migrate
echo $?
0
Is there something wrong in my exec command passed as readinessProbe?
The version of kubernetes server that I am using is 1.21.7.
The base image for my deployment is python:3.7-slim.

Answer 1

The solution for the issue is to increase timeoutSeconds parameter, which is by default set to 1 second:
timeoutSeconds: Number of seconds after which the probe times out. Defaults to 1 second. Minimum value is 1.
After increasing the timeoutSeconds parameter, the application is able to pass the readiness probe.
Example snippet of the deployment with timeoutSeconds parameter set to 5:
containers:
- name: myapp
...
imagePullPolicy: Always
readinessProbe:
exec:
command: ["python", "manage.py", "migrate", "--check"]
initialDelaySeconds: 15
periodSeconds: 5
timeoutSeconds: 5