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Run all pipeline steps in one pod

Harness uses delegates for all operations. To select specific delegates pods to perform the task, Harness uses those delegate pods only. If you don't select specific delegates, Harness manager picks the delegate. For more information, go to How Harness Manager picks delegates.

This topic describes how to run all pipeline steps in a single delegate pod.

Configure pipelines to run steps in the same pod

When you have multiple steps in your pipeline, you can configure your delegate to run all the steps in the same pod.

To run all the steps in the same pod, do the following:

  1. Create the first step that will select one delegate from the list of eligible delegates, and store it in an output variable.

  2. Provide the output variable in step 1 as a dynamic delegate selector in the consecutive steps/stages to pick one individual delegate among the delegate group.

    For example, in the below pipeline, the select_delegate step stores the delegate hostname as an output variable named HOST_SELECTOR and then provides that as a delegate selector in the use_delegate step.

Example pipeline

pipeline:
name: test
identifier: test
projectIdentifier: harness-test
orgIdentifier: default
tags: {}
stages:
- stage:
name: shell
identifier: shell
description: ""
type: Custom
spec:
execution:
steps:
- step:
type: ShellScript
name: select_delegate
identifier: select_delegate
spec:
shell: Bash
onDelegate: true
source:
type: Inline
spec:
script: |
echo $HOSTNAME
HOST_SELECTOR=$HOSTNAME
environmentVariables: []
outputVariables:
- name: HOST_SELECTOR
type: String
value: HOST_SELECTOR
timeout: 10m
- step:
type: ShellScript
name: use delegate
identifier: use_delegate
spec:
shell: Bash
onDelegate: true
source:
type: Inline
spec:
script: echo <+execution.steps.select_delegate.output.outputVariables.HOST_SELECTOR>
environmentVariables: []
outputVariables: []
delegateSelectors:
- <+execution.steps.select_delegate.output.outputVariables.HOST_SELECTOR>
timeout: 10m
failureStrategies: []
tags: {}