backend-deployment.yaml

# Here is the deployment file for the backend. I've set up 2 replicas, meaning 2 pods/containers will be created for the backend.
# In the environment variables, I provided the database connection URL to connect to the MongoDB database.
apiVersion: apps/v1
kind: Deployment
metadata:
  name: backend-deployment
  labels:
    app: backend
spec:
  replicas: 2   # Number of Frontend replicas
  selector:
    matchLabels:
      app: node-backend    # Label selector used by the deployment and service to manage Pods
  template:
    metadata:
      labels:
        app: node-backend   # Labels applied to the Pods created by the Deployments
    spec:
      containers:
      - name: node-backend
        image: divyapatel42/ecommerce-webapp:backendGithubActions
        env:
        - name: DATABASE
          value: "mongodb://root:example@mongodb-0.mongodb.default.svc.cluster.local:27017/Ecommerce?authSource=admin"

#mongodb://root:example@mongodb-0.mongodb.default.svc.cluster.local:27017/Ecommerce?authSource=admin

# 1. **Protocol:** `mongodb://`
#   - This specifies the protocol to be used, which is MongoDB.

# 2. **Username and Password:** `root:example@`
#   - `root` is the username.
#   - `example` is the password.
#   - These credentials are used to authenticate with the MongoDB server.

# 3. **Host:** `mongodb-0.mongodb.default.svc.cluster.local`
#   - This is the fully qualified domain name (FQDN) of the MongoDB server.
#   - `mongodb-0` is the name of the MongoDB pod.
#   - `mongodb` is the name of the service.
#   - `default` is the namespace in which the MongoDB service is running.
#   - `svc.cluster.local` is the cluster domain.

# 4. **Port:** `27017`
#   - This is the default port number for MongoDB.

# 5. **Database:** `Ecommerce`
#   - This specifies the database to connect to within the MongoDB server.

# 6. **Options:** `?authSource=admin`
#   - `authSource=admin` specifies that the authentication should be done against the `admin` database rather than the `Ecommerce` database. 
#       This is useful if the user's credentials are stored in the `admin` database.