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Tutorial: Deploying an application

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Lab overview

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Lab resources

  • Source code for the OSToy application

  • OSToy front-end container image

  • OSToy microservice container image

  • Deployment Definition YAML files:

    ostoy-frontend-deployment.yaml
    apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: ostoy-pvc
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: ostoy-frontend
  labels:
    app: ostoy
spec:
  selector:
    matchLabels:
      app: ostoy-frontend
  strategy:
    type: Recreate
  replicas: 1
  template:
    metadata:
      labels:
        app: ostoy-frontend
    spec:
      # Uncomment to use with ACK portion of the workshop
      # If you chose a different service account name please replace it.
      # serviceAccount: ostoy-sa
      containers:
      - name: ostoy-frontend
        securityContext:
          allowPrivilegeEscalation: false
          runAsNonRoot: true
          seccompProfile:
            type: RuntimeDefault
          capabilities:
            drop:
            - ALL
        image: quay.io/ostoylab/ostoy-frontend:1.6.0
        imagePullPolicy: IfNotPresent
        ports:
        - name: ostoy-port
          containerPort: 8080
        resources:
          requests:
            memory: "256Mi"
            cpu: "100m"
          limits:
            memory: "512Mi"
            cpu: "200m"
        volumeMounts:
        - name: configvol
          mountPath: /var/config
        - name: secretvol
          mountPath: /var/secret
        - name: datavol
          mountPath: /var/demo_files
        livenessProbe:
          httpGet:
            path: /health
            port: 8080
          initialDelaySeconds: 10
          periodSeconds: 5
        env:
        - name: ENV_TOY_secret
          valueFrom:
            secretKeyRef:
              name: ostoy-secret-env
              key: ENV_TOY_secret
        - name: MICROSERVICE_NAME
          value: OSTOY_MICROSERVICE_SVC
        - name: NAMESPACE
          valueFrom:
            fieldRef:
              fieldPath: metadata.namespace
      volumes:
        - name: configvol
          configMap:
            name: ostoy-configmap-files
        - name: secretvol
          secret:
            defaultMode: 420
            secretName: ostoy-secret
        - name: datavol
          persistentVolumeClaim:
            claimName: ostoy-pvc
---
apiVersion: v1
kind: Service
metadata:
  name: ostoy-frontend-svc
  labels:
    app: ostoy-frontend
spec:
  type: ClusterIP
  ports:
    - port: 8080
      targetPort: ostoy-port
      protocol: TCP
      name: ostoy
  selector:
    app: ostoy-frontend
---
apiVersion: route.openshift.io/v1
kind: Route
metadata:
  name: ostoy-route
spec:
  to:
    kind: Service
    name: ostoy-frontend-svc
---
apiVersion: v1
kind: secret
metadata:
  name: ostoy-secret-env
type: Opaque
data:
  ENV_TOY_secret: VGhpcyBpcyBhIHRlc3Q=
---
kind: ConfigMap
apiVersion: v1
metadata:
  name: ostoy-configmap-files
data:
  config.json:  '{ "default": "123" }'
---
apiVersion: v1
kind: secret
metadata:
  name: ostoy-secret
data:
  secret.txt: VVNFUk5BTUU9bXlfdXNlcgpQQVNTV09SRD1AT3RCbCVYQXAhIzYzMlk1RndDQE1UUWsKU01UUD1sb2NhbGhvc3QKU01UUF9QT1JUPTI1
type: Opaque
    ostoy-microservice-deployment.yaml
    apiVersion: apps/v1
kind: Deployment
metadata:
  name: ostoy-microservice
  labels:
    app: ostoy
spec:
  selector:
    matchLabels:
      app: ostoy-microservice
  replicas: 1
  template:
    metadata:
      labels:
        app: ostoy-microservice
    spec:
      containers:
      - name: ostoy-microservice
        securityContext:
          allowPrivilegeEscalation: false
          runAsNonRoot: true
          seccompProfile:
            type: RuntimeDefault
          capabilities:
            drop:
            - ALL
        image: quay.io/ostoylab/ostoy-microservice:1.5.0
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 8080
          protocol: TCP
        resources:
          requests:
            memory: "128Mi"
            cpu: "50m"
          limits:
            memory: "256Mi"
            cpu: "100m"
---
apiVersion: v1
kind: Service
metadata:
  name: ostoy-microservice-svc
  labels:
    app: ostoy-microservice
spec:
  type: ClusterIP
  ports:
    - port: 8080
      targetPort: 8080
      protocol: TCP
  selector:
    app: ostoy-microservice

  • S3 bucket manifest for ACK S3

    s3-bucket.yaml
    apiVersion: s3.services.k8s.aws/v1alpha1
kind: Bucket
metadata:
  name: ostoy-bucket
  namespace: ostoy
spec:
  name: ostoy-bucket

To simplify deployment of the OSToy application, all of the objects required in the above deployment manifests are grouped together. For a typical enterprise deployment, a separate manifest file for each Kubernetes object is recommended.

About the OSToy application

OSToy is a simple Node.js application that you will deploy to a ROSA cluster to help explore the functionality of Kubernetes. This application has a user interface where you can:

  • Write messages to the log (stdout / stderr).

  • Intentionally crash the application to view self-healing.

  • Toggle a liveness probe and monitor OpenShift behavior.

  • Read config maps, secrets, and env variables.

  • If connected to shared storage, read and write files.

  • Check network connectivity, intra-cluster DNS, and intra-communication with the included microservice.

  • Increase the load to view automatic scaling of the pods to handle the load using the Horizontal Pod Autoscaler.

  • Optional: Connect to an AWS S3 bucket to read and write objects.

OSToy Application Diagram

OSToy architecture diagram

Understanding the OSToy UI

Preview of the OSToy homepage

  1. Shows the pod name that served your browser the page.

  2. Home: The main page of the application where you can perform some of the functions listed which we will explore.

  3. Persistent Storage: Allows you to write data to the persistent volume bound to this application.

  4. Config Maps: Shows the contents of configmaps available to the application and the key:value pairs.

  5. secrets: Shows the contents of secrets available to the application and the key:value pairs.

  6. ENV Variables: Shows the environment variables available to the application.

  7. Networking: Tools to illustrate networking within the application.

  8. Pod Auto Scaling: Tool to increase the load of the pods and test the HPA.

  9. ACK S3: Optional: Integrate with AWS S3 to read and write objects to a bucket.

    In order see the "ACK S3" section of OSToy, you must complete the ACK section of this workshop. If you decide not to complete that section, the OSToy application will still function.

  10. About: Displays more information about the application.