Sub Steps

This section describes how to use sub steps in KubeVela.

There is a special step type step-group in KubeVela workflow where you can declare sub-steps when using step-group type steps.

Sub Steps - 图1note

In the version less or equal than v1.4.x, sub steps in a step group are executed concurrently.

In version 1.5+, you can specify the execution mode of steps and sub-steps.

Apply the following example:

  1. apiVersion: core.oam.dev/v1beta1
  2. kind: Application
  3. metadata:
  4.   name: sub-success
  5. spec:
  6.   components:
  7.     - name: express-server1
  8.       type: webservice
  9.       properties:
  10.         image: crccheck/hello-world
  11.     - name: express-server2
  12.       type: webservice
  13.       properties:
  14.         image: crccheck/hello-world
  15.     - name: express-server3
  16.       type: webservice
  17.       properties:
  18.         image: crccheck/hello-world
  20.   workflow:
  21.     steps:
  22.       - name: step1
  23.         type: apply-component
  24.         properties:
  25.           component: express-server1
  26.       - name: step2
  27.         type: step-group
  28.         subSteps:
  29.           - name: step2-sub1
  30.             type: apply-component
  31.             properties:
  32.               component: express-server2
  33.           - name: step2-sub2
  34.             type: apply-component
  35.             properties:
  36.               component: express-server3

By default, steps are executed sequentially, so step2 is not executed until step1 is deployed. Whereas in the step-group, sub-steps will be executed concurrently by default, so step2-sub1 and step2-sub2 will be deployed at the same time.