Tekton安装及Hello world

准备k8s集群

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[[email protected] ~]# kubectl get nodes
NAME         STATUS   ROLES    AGE   VERSION
k8s-master   Ready    master   28d   v1.19.4
k8s-node01   Ready    <none>   28d   v1.19.4
k8s-node02   Ready    <none>   28d   v1.19.4
k8s-node03   Ready    <none>   28d   v1.19.4
k8s-node04   Ready    <none>   28d   v1.19.4

安装

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

检查安装的tekton相关的CRD

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# 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
runs                                              tekton.dev                         true         Run
taskruns                          tr,trs          tekton.dev                         true         TaskRun
tasks                                             tekton.dev                         true         Task

查看pod

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# kubectl get pods --namespace tekton-pipelines
NAME                                           READY   STATUS    RESTARTS   AGE
tekton-pipelines-controller-5cdb46974f-lfnrs   1/1     Running   0          6d
tekton-pipelines-webhook-6479d769ff-7ct5g      1/1     Running   0          6d

安装CLI

CLI：https://github.com/tektoncd/cli#installing-tkn
我这是centos7操作系统

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# rpm -Uvh https://github.com/tektoncd/cli/releases/download/v0.14.0/tektoncd-cli-0.14.0_Linux-64bit.rpm
# tkn -h
CLI for tekton pipelines

Usage:
tkn [flags]
tkn [command]

Available Commands:
  clustertask           Manage ClusterTasks
  clustertriggerbinding Manage ClusterTriggerBindings
  condition             Manage Conditions
  eventlistener         Manage EventListeners
  hub                   Interact with tekton hub
  pipeline              Manage pipelines
  pipelinerun           Manage PipelineRuns
  resource              Manage pipeline resources
  task                  Manage Tasks
  taskrun               Manage TaskRuns
  triggerbinding        Manage TriggerBindings
  triggertemplate       Manage TriggerTemplates

Other Commands:
  completion            Prints shell completion scripts
  version               Prints version information

Flags:
  -h, --help   help for tkn

Use "tkn [command] --help" for more information about a command.
https://github.com/tektoncd/cli#installing-tkn

Tekton：hello world

创建一个简单的Task, 只有一个step就是打印出”hello world”

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

创建一个TaskRun执行上面的Task

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

运行task

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# kubectl apply -f hello_task.yml 
task.tekton.dev/echo-hello-world created
# kubectl get task
NAME               AGE
echo-hello-world   12s
# tkn task list
NAME               DESCRIPTION   AGE
echo-hello-world                 1 minute ago

运行一个taskrun

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# kubectl apply -f hello_task_run.yml 
taskrun.tekton.dev/echo-hello-world-task-run created

检查TaskRun的输出, 执行命令

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# tkn taskrun list
NAME                        STARTED          DURATION    STATUS
echo-hello-world-task-run   25 seconds ago   6 seconds   Succeeded
# kubectl get taskrun
NAME                        SUCCEEDED   REASON      STARTTIME   COMPLETIONTIME
echo-hello-world-task-run   True        Succeeded   37s         31s

# kubectl get pod
NAME                                  READY   STATUS      RESTARTS   AGE
echo-hello-world-task-run-pod-8xnvb   0/1     Completed   0          74s

可以看到有一个pod生成


# tkn taskrun describe echo-hello-world-task-run
Name:              echo-hello-world-task-run
Namespace:         default
Task Ref:          echo-hello-world
Service Account:   default
Timeout:           1h0m0s
Labels:
 app.kubernetes.io/managed-by=tekton-pipelines
 tekton.dev/task=echo-hello-world

Status

STARTED        DURATION    STATUS
1 minute ago   6 seconds   Succeeded

Input Resources

No input resources

Output Resources

No output resources

Params

No params

Results

No results

Workspaces

No workspaces

Steps

NAME     STATUS
echo   Completed

Sidecars

No sidecars

Succeeded状态表示task执行成功.

查看实际的输出，执行命令

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# tkn taskrun logs echo-hello-world-task-run
[echo] hello world

可以看到结果如下

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[echo] hello world
tekton
kubernetes CI/CD

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