How can we create service dependencies using kubernetes

Question

I have 2 services. One containing 2 pod replicas for a web application which is dependent on another backend service having pod (2 replicas) for MySQL containers.

The we

Answer 1

Having the same problem and as what they recommend, using the k8s initContainers solved my problem.

Update

Added sample code.

kind: Service
apiVersion: v1
metadata:
  name:  postgres-service
spec:
  # ...
---
apiVersion: apps/v1
kind: Deployment
# ...
spec:
  # ...
  template:
    # ...
    spec:
      # wait for postgres-service to run first
      initContainers:
      - name: init-wait-for-db
        image: alpine
        command: ["/bin/sh", "-c", "for i in $(seq 1 300); do nc -zvw1 postgres-service 5432 && exit 0 || sleep 3; done; exit 1"]
      containers:
      - name: my-django-app
        image: dockerhubuser/my-django-app
        command: ["/bin/sh", "-c", "python /root/django/manage.py migrate && python /root/django/manage.py runserver 0.0.0.0:8000 --noreload"]
        ports:
        - containerPort: 8000
        env:
          # ...