Mastering Kubernetes - Second Edition

Deploying an internal service

Here is the deployment, which is very similar to the Hue-learner deployment, except that I dropped the annotations, env, and resources sections, kept just one label to save space, and added a ports section to the container. That's crucial, because a service must expose a port through which other services can access it:

apiVersion: apps/v1a1kind: Deploymentmetadata:  name: hue-remindersspec:  replicas: 2   template:    metadata:      name: hue-reminders      labels:        app: hue-reminders    spec:       containers:      - name: hue-reminders        image: g1g1/hue-reminders:v2.2         ports:        - containerPort: 80 

When we run the deployment, two Hue reminders pods are added to the cluster:

> kubectl create -f hue-reminders-deployment.yaml
> kubectl get pods ...