Goodbye Tekton Condition CRD. Save Like. Tekton Pipeline v0.16 includes When Expressions, which are concise, simple, and efficient. Tekton Pipeline v0.16 includes When Expressions, which are concise, simple, and efficient
Pipeline is one of the core building blocks in designing a CI/CD use case on Kubernetes with Tekton. A Tekton Pipeline is a collection of tasks, which run based on how they are arranged. These tasks can be represented as a graph in which each node represents a task and can be arranged in many different ways.
task-C) in parallel. The three tasks start running independently and finish irrespective of the success or failure of other tasks. This kind of arrangement applies to a CI/CD use case, such as running unit tests and integration tests in parallel.
tasks: - name: task-A taskRef: name: task1 - name: task-B taskRef: name: task2 - name: task-C taskRef: name: task3
Design sequence of tasks that run one after each other by using
runAfter. For example,
build-image and waits for it to finish. If
build-image exits with success,
PipelineRun exits with failure without running the rest of the tasks. The same process applies to the next task. This example is the ideal arrangement, but hardly works in real world. It’s very common to run into task failures and require further processing if such failures.
tasks: - name: build-image taskRef: name: build-image - name: e2e-tests runAfter: [ build-image ] taskRef: name: e2e-tests - name: deploy runAfter: [ e2e-tests ] taskRef: name: deploy
Design failure strategies by using
PipelineRun runs tasks that are specified under the
finally section after all tasks under
tasks section are completed regardless success or failure. For example,
finally tasks start running after all tasks are completed successfully or one of the tasks exits with failure.
finally tasks run in parallel just before they exit the
PipelineRun exit status contains
TaskRuns for all tasks, including the
tasks: - name: build-image taskRef: name: build-image - name: e2e-tests runAfter: [ build-image ] taskRef: name: e2e-tests - name: deploy runAfter: [ e2e-tests ] taskRef: name: deploy finally: - name: cleanup taskRef: name: cleanup
So far, this looks great, but what about running a check before you run a task? You can design
PipelineRun to include conditional tasks by using the
Condition CRD to run a check before you run that task. The
Condition CRD, just like a
task, creates a new
pod in a Kubernetes cluster to run that check. Depending on the outcome of that
Condition CRD, a task is run or declared a
failure with a
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