Hands-On Microservices with Kubernetes

Working with Kubernetes ConfigMaps

ConfigMaps are Kubernetes resources that are managed by Kubernetes per namespace, and can be referenced by any pod or container. Here is the ConfigMap for the link-manager service:

apiVersion: v1kind: ConfigMapmetadata:  name: link-service-config  namespace: defaultdata:  MAX_LINKS_PER_USER: "10"  PORT: "8080"

The link-manager deployment resource imports it into the pod by using the envFrom key:

apiVersion: apps/v1kind: Deploymentmetadata:  name: link-manager  labels:    svc: link    app: managerspec:  replicas: 1  selector:    matchLabels:      svc: link      app: manager  template:    metadata:      labels:        svc: link        app: manager    spec:      containers:      - name: link-manager        image: g1g1/delinkcious-link:0.2        ports:        - containerPort: 8080 envFrom: ...