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Runs

Overview

A Run allows you to instantiate and execute a Custom Task, which can be implemented by a custom task controller running on-cluster. Custom Tasks can implement behavior that doesn't correspond directly to running a workload in a Pod on the cluster. For Pod-based on-cluster workloads, you should use a TaskRun.

In order for a Run to actually execute, there must be a custom task controller running on the cluster that is responsible for watching and updating Runs which reference their type. If no such controller is running, Runs will have no .status value and no further action will be taken.

Runs are an experimental alpha feature and should be expected to change in breaking ways or even be removed.

Configuring a Run

A Run definition supports the following fields:

  • Required:
    • apiVersion - Specifies the API version, for example tekton.dev/v1beta1.
    • kind - Identifies this resource object as a Run object.
    • metadata - Specifies the metadata that uniquely identifies the Run, such as a name.
    • spec - Specifies the configuration for the Run.
      • ref - Specifies the type and (optionally) name of the custom task type to execute.
  • Optional:
    • params - Specifies the desired execution parameters for the custom task.

Specifying the target Custom Task

To specify the custom task type you want to execute in your Run, use the ref field as shown below:

spec:
  ref:
    apiVersion: example.dev/v1alpha1
    kind: Example

This initiates the execution of a Run of a custom task of type Example, in the example.dev API group, with the version v1alpha1.

You can also specify the name and optional namespace (default is default) of a custom task resource object previously defined in the cluster.

spec:
  ref:
    apiVersion: example.dev/v1alpha1
    kind: Example
    name: my-example

If the ref specifies a name, the custom task controller should look up the Example resource with that name, and use that object to configure the execution.

If the ref does not specify a name, the custom task controller might support some default behavior for executing unnamed tasks.

In either case, if the named resource cannot be found, or if unnamed tasks are not supported, the custom task controller should update the Run's status to indicate the error.

Specifying Parameters

If a custom task supports parameters, you can use the params field in the Run to specify their values:

spec:
  params:
  - name: my-param
    value: chicken

If the custom task controller knows how to interpret the parameter value, it will do so. It might enforce that some parameter values must be specified, or reject unknown parameter values.

Monitoring execution status

As your Run executes, its status field accumulates information on the execution of the Run. This information includes start and completion times, and any output results reported by the custom task controller.

The following example shows the status field of a Run that has executed successfully:

completionTime: "2019-08-12T18:22:57Z"
conditions:
- lastTransitionTime: "2019-08-12T18:22:57Z"
  message: Execution was successful
  reason: Succeeded
  status: "True"
  type: Succeeded
startTime: "2019-08-12T18:22:51Z"

The following tables shows how to read the overall status of a Run:

status Description
The custom task controller has not taken any action on the Run.
Unknown The custom task controller has started execution and the Run is ongoing.
True The Run completed successfully.
False The Run completed unsuccessfully.

In any case, the custom task controller should populate the reason and message fields to provide more information about the status of the execution.

Monitoring Results

After the Run completes, the custom task controller can report output values in the results field:

results:
- name: my-result
  value: chicken

Code examples

To better understand Runs, study the following code examples:

Example Run with a referenced custom task

In this example, a Run named my-example-run invokes a custom task of the v1alpha1 version of the Example kind in the example.dev API group, with the name my-example-task.

In this case the custom task controller is expected to look up the Example resource named my-example-task and to use that configuration to configure the execution of the Run.

apiVersion: tekton.dev/v1alpha1
kind: Run
metadata:
  name: my-example-run
spec:
  ref:
    apiVersion: example.dev/v1alpha1
    kind: Example
    name: my-example-task

Example Run with an unnamed custom task

In this example, a Run named my-example-run invokes a custom task of the v1alpha1 version of the Example kind in the example.dev API group, without a specified name.

In this case the custom task controller is expected to provide some default behavior when the referenced task is unnamed.

apiVersion: tekton.dev/v1alpha1
kind: Run
metadata:
  name: my-example-run
spec:
  ref:
    apiVersion: example.dev/v1alpha1
    kind: Example

Example of specifying parameters

In this example, a Run named my-example-run invokes a custom task, and specifies some parameter values to further configure the execution's behavior.

In this case the custom task controller is expected to validate and interpret these parameter values and use them to configure the Run's execution.

apiVersion: tekton.dev/v1alpha1
kind: Run
metadata:
  name: my-example-run
spec:
  ref:
    apiVersion: example.dev/v1alpha1
    kind: Example
    name: my-example-task
  params:
  - name: my-first-param
    value: i'm number one
  - name: my-second-param
    value: close second