azure-aks docker container python-django url not working - docker

Question

I have created Docker that has debian + python-django that runs on 8000 port. But after deploying into azure-aks, url path is not working under 8000 port. Keeping important detials below.
Step 1:
Dockerfile :
EXPOSE 8000
RUN /usr/local/bin/python3 manage.py migrate
CMD [ "python3", "manage.py", "runserver", "0.0.0.0:8000" ]
Step 2:
After building docker image, pushing it to azure registry.
Step 3:
myfile.yaml : this is to deploy azure registry file into aks cluster.
apiVersion: apps/v1
kind: Deployment
metadata:
name: myops
spec:
replicas: 1
selector:
matchLabels:
app: myops
template:
metadata:
labels:
app: myops
spec:
containers:
- name: myops
image: quantumregistry.azurecr.io/myops:v1.0
ports:
- containerPort: 8000
---
# [START service]
apiVersion: v1
kind: Service
metadata:
name: myops-python
spec:
type: LoadBalancer
ports:
- port: 8000
targetPort: 8888
selector:
app: myops
# [END service]
Deploy into aks : kubectl apply -f myops.yaml
Step 4: check sevice
kubectl get service myops-python --watch
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
myops-python LoadBalancer <cluster-ip> <external-ip> 8000:30778/TCP 37m
Note: i have masked IP to not to expose to public.
step 5: i see container is running alright
kubectl get pods
NAME READY STATUS RESTARTS AGE
myops-5bbd459745-cz2vc 1/1 Running 0 19m
step 6: I see container log and it shows that python is running under host 0.0.0.0:8000 port.
kubectl logs -f myops-5bbd459745-cz2vc
Watching for file changes with StatReloader
Performing system checks...
WARNING:param.main: pandas could not register all extension types imports failed with the following error: cannot import name 'ABCIndexClass' from 'pandas.core.dtypes.generic' (/usr/local/lib/python3.9/site-packages/pandas/core/dtypes/generic.py)
System check identified no issues (0 silenced).
September 19, 2021 - 06:47:57
Django version 3.2.5, using settings 'myops_project.settings'
Starting development server at http://0.0.0.0:8000/
Quit the server with CONTROL-C.
The issue is that when I open this in browser http://:8000/myops_app, it is not working and timing out.

Answer 1

The Service myops-python is set up to receive requests on port 8000 but then it will send the request to the pod on target port 8888.
ports:
- port: 8000
targetPort: 8888
The container myops in the Pod myops, however, is not listening on port 8888. Rather it is listening on port 8000.
Dockerfile:
EXPOSE 8000
RUN /usr/local/bin/python3 manage.py migrate CMD [ "python3", "manage.py", "runserver", "0.0.0.0:8000" ]
Please set spec.ports[0].targetPort to 8000 manually or remove targetPort from spec.ports[0] in the Service myops-python. By default and for convenience, the targetPort is set to the same value as the port field. For more information please see Defining a Service.
Tip: You can use kubectl edit service <service-name> -n <namepsace> to edit your Service manifest.