Difference between revisions of "Kubernetes"

Revision as of 14:14, 4 April 2022

Configurations YAML File

Deployment

 - kind: Deployment
   apiVersion: apps/v1
   metadata:
     name: app-deployment
     namespace: app-ns
   spec:
     replicas: 1
     selector:
       matchLabels:
         app: my-app
     template:
       metadata:
         labels:
           app: my-app
       spec:
         volumes:
           - name: app-secrets-volume
             secret:
               secretName: my-secret
         containers:
           - image: ${CONTAINER_REGISTRY_URL}/${IMAGE_NAME}:${IMAGE_TAG}
             name: my-app
             ports:
                - containerPort: 8080
             envFrom:
               - configMapRef:
                  name: app-config
               - secretRef:
                  name: my-secrets
             env:
               - name: CUSTOM_ENV_VAR
                 value: "soon_to_come"
             volumeMounts:
               - name: app-secrets-volume
                 mountPath: /opt/my-app/secrets-volume
                 readOnly: true
         restartPolicy: Always
         terminationGracePeriodSeconds: 30

Service

 - kind: Service
   apiVersion: v1
   metadata:
     name: app-service
     namespace: app-ns
   spec:
     ports:
       - port: 8080
         targetPort: 8080
     selector:
       app: my-app

Use the following option to make the service Headless, this is good when each of the pods has state and the state could be different between them. This exposes each pods ip through a DNS lookup.

 Service.spec.clusterIP: None

ConfigMap

 # ConfigMap Configuration
 - kind: ConfigMap
   apiVersion: v1
   metadata:
     name: app-config
     namespace: app-ns
   data:
     CONFIG_TEMP: soon-to-come