dev.to - config

create-configmap.sh

kubectl create configmap haproxy-auth-gateway-cfg --from-file=config/haproxy.cfg

create-secret.sh

kubectl create secret generic -n hotel db-credentials \
  --from-literal=username=someuser \
  --from-literal=password='PasswordWithSpecialCharsLikeThis:S!\*$='

inject-configmap-volume.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: gateway
  labels:
    app.kubernetes.io/name: gateway
spec:
  replicas: 1
  selector:
    matchLabels:
      app.kubernetes.io/name: gateway
  template:
    metadata:
      labels:
        app.kubernetes.io/name: gateway
    spec:
      containers:
      - name: gateway
        image: lukasz/yosoy
        ports:
        - containerPort: 80
        volumeMounts:
        - name: haproxy-cfg
          mountPath: /usr/local/etc/haproxy
      volumes:
        - name: haproxy-cfg
          configMap:
            name: haproxy-auth-gateway-cfg

inject-secret-env.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: bookmaker
  labels:
    app.kubernetes.io/name: bookmaker
spec:
  replicas: 1
  selector:
    matchLabels:
      app.kubernetes.io/name: bookmaker
  template:
    metadata:
      labels:
        app.kubernetes.io/name: bookmaker
    spec:
      containers:
      - name: bookmaker
        image: lukasz/yosoy
        env:
        - name: DB_USER
          valueFrom:
            secretKeyRef:
              name: db-credentials
              key: username
        - name: DB_PASSWORD
          valueFrom:
            secretKeyRef:
              name: db-credentials
              key: password
        ports:
        - containerPort: 80

migrator-config.yaml

dataSource: "user=${DB_USER} password=${DB_PASSWORD} dbname=${DB_NAME} host=${DB_HOST} port=${DB_PORT}"
webHookHeaders:
  - "X-Security-Token: ${SECURITY_TOKEN}"

These are code samples and listings for my dev.to article: https://dev.to/lukaszbudnik/building-cloud-native-apps-config-and-toggles-2384