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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.

note

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:

apiVersion: core.oam.dev/v1beta1
kind: Application
metadata:
name: sub-success
spec:
components:
- name: express-server1
type: webservice
properties:
image: crccheck/hello-world
- name: express-server2
type: webservice
properties:
image: crccheck/hello-world
- name: express-server3
type: webservice
properties:
image: crccheck/hello-world

workflow:
steps:
- name: step1
type: apply-component
properties:
component: express-server1
- name: step2
type: step-group
subSteps:
- name: step2-sub1
type: apply-component
properties:
component: express-server2
- name: step2-sub2
type: apply-component
properties:
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.