servicestateful.yaml

# For the full spec setting and usage, see ./pkg/apis/frameworkcontroller/v1/types.go
apiVersion: frameworkcontroller.microsoft.com/v1
kind: Framework
metadata:
  name: servicestateful
spec:
  executionType: Start
  retryPolicy:
    fancyRetryPolicy: false
    maxRetryCount: -2
  taskRoles:
  - name: serverstateful
    taskNumber: 3
    frameworkAttemptCompletionPolicy:
      minFailedTaskCount: 1
      minSucceededTaskCount: -1
    task:
      retryPolicy:
        fancyRetryPolicy: false
        maxRetryCount: -2
      # Never force delete Pod as it may break the stateful service.
      podGracefulDeletionTimeoutSec: null
      pod:
        spec:
          # By leveraging below Headless Service, the Pod can be discovered by its DNS FQDN:
          # {FC_TASKROLE_NAME}-{FC_TASK_INDEX}.{FC_FRAMEWORK_NAME}.{FC_FRAMEWORK_NAMESPACE}.svc.cluster.local
          hostname: "{{FC_TASKROLE_NAME}}-{{FC_TASK_INDEX}}"
          subdomain: "{{FC_FRAMEWORK_NAME}}"
          # Using Never restartPolicy, ActiveDeadlineSeconds and initContainers
          # just to demonstrate consistent identities in this example.
          restartPolicy: Never
          ActiveDeadlineSeconds: 60
          containers:
          - name: nginx
            image: nginx:stable
            ports:
            - containerPort: 80
          initContainers:
          - name: ubuntu
            image: ubuntu:trusty
            # See comments in batchstatefulfailed.yaml
            command: [
              "sh", "-c",
              "printenv &&
              getent ahosts &&
              echo Local DNS FQDN Resolved: $(hostname -f) &&
              PEER_FQDN=${FC_TASKROLE_NAME}-$((2-${FC_TASK_INDEX})).${FC_FRAMEWORK_NAME}.${FC_FRAMEWORK_NAMESPACE}.svc.cluster.local &&
              until getent ahosts ${PEER_FQDN};
                do echo Waiting Peer DNS FQDN Resolved: ${PEER_FQDN}; sleep 3;
              done;
              echo Peer DNS FQDN Resolved: ${PEER_FQDN}"]
---
# Post to {kubeApiServerAddress}/api/v1/namespaces/default/services/
# It is a Headless Service which does not create a load-balancer, but still
# creates DNS records for each Pod of above Framework, so that they can resolve
# each other's IP.
apiVersion: v1
kind: Service
metadata:
  name: servicestateful
spec:
  # Headless Service
  clusterIP: None
  # Create DNS records regardless of Pod readiness, to simply peer discovery.
  publishNotReadyAddresses: true
  selector:
    # See comments in service.yaml
    FC_FRAMEWORK_NAME: servicestateful
    FC_TASKROLE_NAME: serverstateful
  ports:
  - targetPort: 80
    port: 30180