Config maps and Secrets

• Refer Here for config maps and Refer Here for secrets
• Configmap example

---
apiVersion: v1
kind: ConfigMap
metadata:
  name: mysql-cm
data:
  MYSQL_ROOT_PASSWORD: qwerty456
  MYSQL_DATABASE: sales
  MYSQL_USER: ltdevops
  MYSQL_PASSWORD: qwerty456
---
apiVersion: v1
kind: Pod
metadata:
  name: mysql-fromcm
  labels:
    app: mysql
spec:
  containers:
    - name: mysql-fromcm
      image: mysql:lts
      ports:
        - containerPort: 3306
      envFrom:
        - configMapRef:
            name: mysql-cm
            optional: False

* Secret Example

---
apiVersion: v1
kind: Secret
metadata:
  name: mysql-creds
data:
  MYSQL_ROOT_PASSWORD: cXdlcnR5NDU2Cg==
  MYSQL_DATABASE: c2FsZXMK
  MYSQL_USER: bHRkZXZvcHMK
  MYSQL_PASSWORD: cXdlcnR5NDU2Cg==
---
apiVersion: v1
kind: Pod
metadata:
  name: mysql-fromsecret
  labels:
    app: mysql
    db: mysql
spec:
  containers:
    - name: mysql-fromcm
      image: mysql:lts
      ports:
        - containerPort: 3306
      envFrom:
        - secretRef:
            name: mysql-creds
            optional: False

Daemon sets

• Now ensure you have k8s cluster with multiple nodes
• Refer Here for daemonset

---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: my-ds
spec:
  minReadySeconds: 5
  selector:
    matchLabels:
      app: agent
  template:
    metadata:
      labels:
        app: agent
    spec:
      containers:
        - name: agent
          image: alpine
          args:
            - sleep
            - 1d