Building and Deploying Workflows with the Operator

This document describes how to build and deploy your workflow on a cluster using the SonataFlow Operator only by having a SonataFlow custom resource.

Every time you need to change the workflow definition the system will (re)build a new immutable version of the workflow. If you’re still in development phase, please see the Developing Workflow with the Operator guide.

Follow the Kubernetes or OpenShift sections of this document based on the cluster you wish to build your workflows on.

SonataFlow Operator is under active development with features yet to be implemented. Please see SonataFlow Operator Known Issues, Limitations and Roadmap.

Prerequisites

A Workflow definition.
The SonataFlow Operator installed. See Install the SonataFlow Operator guide

Configuring the build system

The operator can build workflows on Kubernetes or OpenShift. On Kubernetes, it uses Kaniko and on OpenShift a standard BuildConfig. The operator build system is not tailored for advanced use cases and you can do only a few customizations.

Changing the base build Dockerfile

The operator uses the sonataflow-operator-builder-config ConfigMap in the operator’s installation namespace (sonataflow-operator-system) to configure and run the workflow build process. You can change the Dockerfile entry in this ConfigMap to tailor the Dockerfile to your needs. Just be aware that this can break the build process.

Example of the sonataflow-operator-builder-config ConfigMap

apiVersion: v1
data:
  DEFAULT_BUILDER_RESOURCE_NAME: Dockerfile
  DEFAULT_WORKFLOW_EXTENSION: .sw.json
  Dockerfile: "FROM quay.io/kiegroup/kogito-swf-builder-nightly:latest AS builder\n
    \ \n  # Copy from build context to skeleton resources project\nCOPY * ./resources/\n\nRUN
    /home/kogito/launch/build-app.sh ./resources\n  \n  #=============================\n
    \ # Runtime Run\n  #=============================\nFROM registry.access.redhat.com/ubi8/openjdk-11:latest\n\nENV
    LANG='en_US.UTF-8' LANGUAGE='en_US:en'\n  \n  # We make four distinct layers so
    if there are application changes the library layers can be re-used\nCOPY --from=builder
    --chown=185 /home/kogito/serverless-workflow-project/target/quarkus-app/lib/ /deployments/lib/\nCOPY
    --from=builder --chown=185 /home/kogito/serverless-workflow-project/target/quarkus-app/*.jar
    /deployments/\nCOPY --from=builder --chown=185 /home/kogito/serverless-workflow-project/target/quarkus-app/app/
    /deployments/app/\nCOPY --from=builder --chown=185 /home/kogito/serverless-workflow-project/target/quarkus-app/quarkus/
    /deployments/quarkus/\n\nEXPOSE 8080\nUSER 185\nENV AB_JOLOKIA_OFF=\"\"\nENV JAVA_OPTS=\"-Dquarkus.http.host=0.0.0.0
    -Djava.util.logging.manager=org.jboss.logmanager.LogManager\"\nENV JAVA_APP_JAR=\"/deployments/quarkus-run.jar\"\n"
kind: ConfigMap
metadata:
  name: sonataflow-operator-builder-config

The excerpt above is just an example. The current version might have a slightly different version. Don’t use this example in your installation.

Changing resources requirements

You can create or edit a SonataFlowPlatform in the workflow namespace specifying the resources requirements for the internal builder pods:

Example of SonataFlowPlatform

apiVersion: sonataflow.org/v1alpha08
kind: SonataFlowPlatform
metadata:
  name: sonataflow-platform
spec:
  build:
    resources:
      requests:
        memory: "64Mi"
        cpu: "250m"
      limits:
        memory: "128Mi"
        cpu: "500m"

Every build process will reuse this configuration and start new instances based on it from now on.

Only one SonataFlowPlatform is allowed per namespace. Try fetching the one the operator created for you and edit it instead of trying to create another one.

You can fine tune the resources requirements for a particular workflow. Every workflow instance will have a SonataFlowBuild instance created with the same name as the workflow. You can edit the SonataFlowBuild custom resource and specify the same parameters. For example:

Example of SonataFlowBuild

apiVersion: sonataflow.org/v1alpha08
kind: SonataFlowBuild
metadata:
  name: my-workflow
spec:
    resources:
        requests:
        memory: "64Mi"
        cpu: "250m"
        limits:
        memory: "128Mi"
        cpu: "500m"

This parameters will only apply to new build instances.

Building on Kubernetes

You can skip this section if you’re running on OpenShift.

Follow these steps to configure your Kubernetes namespace to build workflow images with the operator.

Create a namespace for the building phase

Create a new namespace that will hold all the resources that the operator will create (Pods, Deployments, Services, Secrets, ConfigMap, and Custom Resources) in this guide.

Create a Namespace for the workflow to build and run in

kubectl create namespace workflows
# set the workflows namespace to your context
kubectl config set-context --current --namespace=workflows

Create a Secret for the container registry authentication

You can follow these steps to publish on external registry that requires authentication. If you’re running on Minikube, just enable the internal registry. You can skip this whole section since the internal Minikube registry doesn’t require authentication.

Create a secret for the container registry authentication

kubectl create secret docker-registry regcred --docker-server=<registry_url> --docker-username=<registry_username> --docker-password=<registry_password> --docker-email=<registry_email> -n workflows

or you can directly import your local docker config into your Kubernetes cluster:

Create a secret for the container registry authentication based on local docker config

kubectl create secret generic regcred --from-file=.dockerconfigjson=${HOME}/.docker/config.json --type=kubernetes.io/dockerconfigjson -n workflows

Double check your ${HOME}/.docker/config.json. If you’re using local desktop authentication, this configuration won’t work in the cluster. You can initialize this by logging in in the target registry, e.g. docker login.

Configure the SonataFlow Operator (i.e. registry address, secret) for building your workflows

The SonataFlowPlatform is the Custom Resource used to control the behavior of the SonataFlow Operator. It defines the behavior of the operator when handling all SonataFlow Custom Resources (Workflow and Build) in the given namespace.

Since the operator is installed in global mode, you will need to specify a SonataFlowPlatform in each Namespace where you want to deploy Workflows.

If you have deployed a workflow for development you already have a SonataFlowPlatform custom resource since the operator created one for you. Just edit the one you have.

Following is a very basic SonataFlowPlatform Custom Resource example to work on Kubernetes:

Example of a basic SonataFlowPlatform on Kubernetes

apiVersion: sonataflow.org/v1alpha08
kind: SonataFlowPlatform
metadata:
  name: sonataflow-platform
spec:
  platform:
    buildStrategyOptions:
      KanikoBuildCacheEnabled: "true"
    registry:
      address: quay.io/kiegroup (1)
      secret: regcred (2)

1	Your registry address
2	The secret name created in the steps above

On Minikube, you can remove the registry information entirely since you don’t need credentials for pushing to the internal registry:

Example of a basic SonataFlowPlatform on Minikube

apiVersion: sonataflow.org/v1alpha08
kind: SonataFlowPlatform
metadata:
  name: sonataflow-platform
spec:
  platform:
    buildStrategyOptions:
      KanikoBuildCacheEnabled: "true"

The spec.platform.buildStrategyOptions.KanikoBuildCacheEnabled enables the internal Kaniko process to cache builder images to try to speed up the bulding execution.

You can save this file locally and run the following command:

Create a SonataFlowPlatform

kubectl apply -f my-sonataflowplatform.yaml -n workflows

You can also update "on-the-fly" the SonataFlowPlatform registry field with this command (change <YOUR_REGISTRY>)

Create a SonataFlowPlatform with a specific registry

cat my-sonataflowplatform.yaml | sed "s|address: .*|address: <YOUR_REGISTRY>" | kubectl apply -f -

Building on OpenShift

You don’t need to do anything to build on OpenShift since the operator will configure everything for you. There are a few customizations you can do described in the Configuring the build system section.

In general, the operator will create a BuildConfig to build the workflow using the mapped resource files and your workflow definition. After the build is finished, the image will be pushed to the internal OpenShift registry backed by an ImageStream object.

Changing the base builder image

If you are running on OpenShift, you have access to the Red Hat’s supported registry. You can change the default builder image by editing the sonataflow-operator-builder-config ConfigMap.

oc edit cm/sonataflow-operator-builder-config -n sonataflow-operator-system

In your editor, change the first line in the Dockerfile entry where it reads FROM quay.io/kiegroup/kogito-swf-builder-nightly:latest to the desired image.

This image must be compatible with your operator’s installation.

Build and deploy your workflow

You can now send your workflow definition (SonataFlow) to the operator.

You can find a basic SonataFlow bellow:

Example of the greetings workflow example

apiVersion: sonataflow.org/v1alpha08
kind: SonataFlow
metadata:
  name: greeting
  annotations:
    sonataflow.org/description: Greeting example on k8s!
    sonataflow.org/version: 0.0.1
spec:
  flow:
    start: ChooseOnLanguage
    functions:
      - name: greetFunction
        type: custom
        operation: sysout
    states:
      - name: ChooseOnLanguage
        type: switch
        dataConditions:
          - condition: "${ .language == \"English\" }"
            transition: GreetInEnglish
          - condition: "${ .language == \"Spanish\" }"
            transition: GreetInSpanish
        defaultCondition: GreetInEnglish
      - name: GreetInEnglish
        type: inject
        data:
          greeting: "Hello from JSON Workflow, "
        transition: GreetPerson
      - name: GreetInSpanish
        type: inject
        data:
          greeting: "Saludos desde JSON Workflow, "
        transition: GreetPerson
      - name: GreetPerson
        type: operation
        actions:
          - name: greetAction
            functionRef:
              refName: greetFunction
              arguments:
                message:  ".greeting+.name"
        end: true

Save a file in your local file system with this contents named greetings-workflow.yaml then run:

kubectl apply -f greetings-workflow.yaml -n workflows

You can check the logs of the build of your Workflow via:

Get the Workflow pod logs

# on Kubernetes
kubectl logs kogito-greeting-builder -n workflows

# on OpenShift
oc logs buildconfig/greeting -n workflows

The final pushed image must be printed into the logs at the end of the build.

Check if the Workflow is running

In order to check that the SonataFlow Greeting is up and running, you can try to perform a test HTTP call, from the greeting Pod.

Procedure

Expose the workflow so you can access it:

Exposing the greeting workflow on Minikube

# On Minikube you can use Nodeport
kubectl patch svc greeting -n workflows -p '{"spec": {"type": "NodePort"}}'
GREETING_SVC=$(minikube service greeting -n workflows --url)

Exposing the greeting workflow on OpenShift

# On OpenShift you can expose a route: https://docs.openshift.com/container-platform/4.13/networking/routes/route-configuration.html#nw-creating-a-route_route-configuration
oc expose svc greeting -n workflows
# get the public URL
GREETING_SVC=$(oc get route/greeting --template='{{.spec.host}}')

Make the HTTP call using curl:

Check if the greeting workflow is running

curl -X POST -H 'Content-Type:application/json' -H 'Accept:application/json' -d '{"name": "John", "language": "English"}' $GREETING_SVC/greeting

If everything is working, you should receive a response like this:

Response from the greeting workflow

{"id":"b5fbfaa3-b125-4e6c-9311-fe5a3577efdd","workflowdata":{"name":"John","language":"English","greeting":"Hello from JSON Workflow, "}}

Additional resources

Found an issue?

If you find an issue or any misleading information, please feel free to report it here. We really appreciate it!