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05.app_workflows.md

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Application workflows

Workflows enable us to define the orchestration of the application deployment. To do that, an application may be associated with a Workflow in which we make use of the available WorkflowStepDefinitions to define the individual steps.

To illustrate how workflows can be used, lets take the WordPress example and define a workflow that will perform the following steps:

  1. Deploy a test service that simulates a discovery subsystem. This will be use later on to demonstrate how the workflow can communicate with other subsystems.
  2. Deploy mysql
  3. Deploy wordpress
  4. Send a registration message to an HTTP endpoint
  5. Add information to the application status

To execute the example, use:

vela up -f scenarios/complex_app/wordpress_with_workflow.yml

Checking the status will show the state of the workflow and its progress

$ vela status my-wordpress-wf -n kubecon
About:

  Name:      	my-wordpress-wf
  Namespace: 	kubecon
  Created at:	2023-04-11 17:20:12 +0200 CEST
  Status:    	running

Workflow:

  mode: StepByStep-DAG
  finished: true
  Suspend: false
  Terminated: false
  Steps
  - id: ebahqxk2hy
    name: deploy-fake-discover-svc
    type: apply-component
    phase: succeeded
  - id: eu29okbop9
    name: deploy-mysql
    type: apply-component
    phase: succeeded
  - id: k3d4pmzy5o
    name: deploy-wordpress
    type: apply-component
    phase: succeeded
  - id: prdd9jyqsi
    name: notify
    type: webhook
    phase: succeeded
  - id: nvshorkp1s
    name: deployed
    type: print-message-in-status
    phase: succeeded
    message: App has been deployed, connect through http://localhost:8090/ or http://localhost depending on the cluster deployment
...

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