Make a Pod and Service for Django

Note

Complete the Ready to Deploy milestone before starting this lab.

In this lab you’ll make a pod for your Django container. For now the pod won’t use an external database, instead selecting the SQLite database for testing purposes. The completed pod from this lab will be a starting point for when you work on the next milestone, Deploy to Kubernetes. You can deploy this pod to Minikube in your dev environment or into the GKE Autopilot cluster you created last week. It’s up to you.

Pod Definition

Start with a simple pod definition derived from the Kubernetes documentation. Copy and paste this YAML into a file named deployment/mysite-pod.yaml.

apiVersion: v1
kind: Pod
metadata:
  name: mysite
  labels:
    app: mysite
spec:
  containers:
  - name: mysite
    image: ghcr.io/mike-matera/cis-92:main
    imagePullPolicy: Always
    ports:
    - containerPort: 8000
    env:
    - name: DB_ENGINE
      value: "sqlite"
    - name: DJANGO_ADMIN_EMAIL
      value: "test@test.test"
    - name: DJANGO_ADMIN_USERNAME
      value: "test"
    - name: DJANGO_SUPERUSER_PASSWORD
      value: "test"

Warning

Change ghcr.io/your-name/your-repo:main to the Docker URL of your GitHub release.

Service Definition

Copy and paste the following into deployment/mysite-service.yaml:

apiVersion: v1
kind: Service
metadata:
  name: mysite
spec:
  type: LoadBalancer
  selector:
    app: mysite
  ports:
    - protocol: TCP
      port: 80
      targetPort: 8000

Deploy the Pod and Service

Deploy your pod with the command:

$ kubectl apply -f deployment/mysite-pod.yaml

Deploy your service with the command:

$ kubectl apply -f deployment/mysite-service.yaml

Verify the deployment and service:

$ kubectl get all
NAME         READY   STATUS    RESTARTS   AGE
pod/mysite   1/1     Running   0          3m23s

NAME                 TYPE           CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE
service/kubernetes   ClusterIP      10.96.0.1       <none>        443/TCP        7h46m
service/mysite       LoadBalancer   10.105.26.245   <pending>     80:30935/TCP   3m16s

Access the Service

Access the service using the port-forward command:

$ kubectl port-forward service/mysite 8080:80

Preview the application on localhost:8080

Access the Pod

Create a shell in your Django pod and verify that the database is in the /db directory:

$ kubectl exec -it pod/mysite -- /bin/bash

Inside the container check for the database file:

root@mysite:/app# ls -l /db 
total 140
-rw-r--r-- 1 root root 143360 Mar 24 18:30 db.sqlite3