Cloud native cicd framework: Tekton

author | AddoZhang

source | The cloud points north

Tekton yes Google Open source Kubernetes Native CI/CD System , Powerful function, strong expansibility . Formerly known as Knavite Inside build-pipeline project , Later, it hatches into an independent project . And become CDF One of the four projects under , The other three are Jenkins, Jenkins X, Spinnaker.

Why do you say Tekton yes Kubernetes Native , Because it is based on Kubernetes Of CRD Defined Pipeline Assembly line .

CRD And description ：

• Task: Build tasks , You can define some columns of steps. Every step By a container perform .

• TaskRun: task Actual execution , And provide the parameters needed for execution . After this object is created , There will be pod Be created .

• Pipeline: Define one or more task Implementation , as well as PipelineResource And various sets of defining parameters .

• PipelineRun: similar task and taskrun The relationship between : One definition, one execution . PipelineRun It is pipeline The actual implementation of . After creation, it will also create pod To perform the various task.

• PipelineResource: Pipeline input resources , such as github/gitlab Source code , Some kind of storage service file , Or mirror images, etc . Execution time , It will also serve as pod One of them container To run the ( Like pulling code ).

• Condition: stay pipeline Of task Execute by adding condition To evaluate the conditions , And then judge whether to carry out task. At present, it is WIP The state of , stay #1137 Completion 、

Components :

• tekton-pipelines-controller: monitor CRD object (TaskRun, PipelineRun) The creation of , Create... For this execution pod.

• tekton-pipelines-webhook: Yes apiserver Provide http Interface making CRD Object verification

install

kubectl apply --filename https://storage.googleapis.com/tekton-releases/pipeline/latest/release.yaml

Check the installation tekton dependent CRD:

kubectl api-resources | grep tekton
clustertasks                                   tekton.dev                     false        ClusterTask
conditions                                     tekton.dev                     true         Condition
pipelineresources                              tekton.dev                     true         PipelineResource
pipelineruns                      pr,prs       tekton.dev                     true         PipelineRun
pipelines                                      tekton.dev                     true         Pipeline
taskruns                          tr,trs       tekton.dev                     true         TaskRun
tasks                                          tekton.dev                     true         Task

tekton  Of the two pod:

kubectl get pods --namespace tekton-pipelines
NAME                                           READY   STATUS    RESTARTS   AGE
tekton-pipelines-controller-556d8f4494-2qthv   1/1     Running   0          11m
tekton-pipelines-webhook-849cff5cf-8m5qq       1/1     Running   0          11m

install CLI

cli: https://github.com/tektoncd/cli#installing-tkn

brew install tektoncd-cli

Tekton: hello world

Create a simple Task, only one step Just print out ”hello world”

apiVersion: tekton.dev/v1alpha1
kind: Task
metadata:
  name: echo-hello-world
spec:
  steps:
    - name: echo
      image: alpine
      command:
        - echo
      args:
        - "hello world"

Create a TaskRun Execute the above Task

apiVersion: tekton.dev/v1alpha1
kind: TaskRun
metadata:
  name: echo-hello-world-task-run
spec:
  taskRef:
    name: echo-hello-world

function task:

kubectl apply -f <name-of-file.yaml>

Check TaskRun Output , Carry out orders :

tkn taskrun describe echo-hello-world-task-run

Name:        echo-hello-world-task-run
Namespace:   tekton-pipelines
Task Ref:    echo-hello-world

Status
STARTED          DURATION    STATUS
21 minutes ago   1 minute    Succeeded

Input Resources
No resources

Output Resources
No resources

Params
No params

Steps
NAME   STATUS
echo   Completed

Succeeded State means task Successful implementation .

View actual output , Carry out orders :

tkn taskrun logs echo-hello-world-task-run

result :

[echo] hello world

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