Cloud-native pipeline with Tekton

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Sample App Web Service 1 Web Service 2 http request http response http request http response

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CI/CD Pipeline Build Web Service 1 (Task) Build Web Service 2 (Task) Deploy Web Service 1 (Task) Deploy Web Service 2 (Task) container image (PipelineResource) container image (PipelineResource) (Pipeline) source code (PipelineResource) source code (PipelineResource) execution order inputs

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● Kubernetes Style Resources ⇔ Tekton Custom Resources ● Declaring CI/CD Pipelines ⇔ Tekton Controllers Manages State

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“Kubernetes resource model is coming to an API near you!” - Kubernetes-style APIs of the Future, Daniel Smith KubeCon CloudNativeCon Europe, May 2018

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Kubernetes Resource Model API Operation State Handles

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API Operations Resources ● Pods ● Deployments ● Service ● Node ● ... Verbs ● Get ● List ● Create ● Update ● Delete ● Patch ● Watch

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● Pods ● Deployments ● Service ● Node ● … ● Custom Resources ● Get ● List ● Create ● Update ● Delete ● Patch ● Watch API Operations Resources Verbs

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State Controllers ● Split System State into small pieces ● Separate Controllers manage each piece Resource State Controller Events

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● Split System State into small pieces ● Separate Controllers manage each piece Resource State Controller Events Yes!, we can add custom controllers :) State Controllers

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Tekton Pipeline Custom Resources ● Task ● PipelineResource ● Pipeline ● TaskRun ● PipelineRun

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Task ● Defines the work that needs to be executed ● Every task runs as a Pod ● Contains multiple steps

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Steps (in a Task) ● Series of commands ● Sequentially executed by the task. ● Each step in a task runs as a container Task step step step

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Task Input and Outputs ● Input ● PipelineResources ● Parameters ● Output ● PipelineResources

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PipelineResource ● Predefined input/output ● System defined resource types ready to use ● Decoupled and reusable ● Commonly used PipelineResource types: image, git

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Pipeline ● Defines list of Tasks to execute ● Expresses Task order (graph) ● Links Tasks inputs and outputs Pipeline Task Task Task Task Task

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Pipeline

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TaskRun ● Instance of a defined Task ● Binds the inputs/outputs to a Task ● Sets values to the parameters ● Executes Task steps

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TaskRun

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TaskRun

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TaskRun

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TaskRun

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PipelineRun ● Instance of a defined Pipeline ● Binds inputs/outputs to a Pipeline ● Execute the Tasks in the Pipeline ● Create the TaskRuns for each Task and collect the results

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CI/CD with Tekton Pipeline on Kubernetes Demo

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Sample App Web Service 1 Web Service 2 http request http response http request http response

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Build Task Pull source code (Step) Build container Image (Step) Push container image (Step) (Task) source code (PipelineResource) container image (PipelineResource) execution order inputs

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Deployment Task Update Deployment manifest (Step) Create Deployment (Step) (Task) container image (PipelineResource) Functional web services execution order inputs

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source code (PipelineResource) source code (PipelineResource) execution order inputs CI/CD Pipeline Build Web Service 1 (Task) Build Web Service 2 (Task) Deploy Web Service 1 (Task) Deploy Web Service 2 (Task) container image (PipelineResource) container image (PipelineResource) (Pipeline)

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tkn (Tekton CLI) Available Commands ● task : Manage tasks ● taskrun : Manage taskruns ● pipeline : Manage pipelines ● pipelinerun : Manage pipelineruns ● completion : Prints shell completion scripts ● help : Help about any command ● version : Prints version information

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tkn task Available Sub-Commands ● list : Lists tasks in a namespace tkn taskrun Available Sub-Commands ● list : Lists taskruns in a namespace ● logs : Displays taskrun logs

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tkn pipeline Available Sub-Commands ● describe : Describes a pipeline in a namespace ● list : Lists pipelines in a namespace ● start : Start pipelines by creating a pipelinerun in a namespace tkn pipelinerun Available Sub-Commands ● describe : Describe a pipelinerun in a namespace ● list : Lists pipelineruns in a namespace ● logs : Display pipelinerun logs