Tekton 基于 gitlab 触发流水线

Tekton EventListener 在8080端口监听事件，Gitlab 提交代码产生push 事件，gitlab webhook触发tekton流水线执行。

前置要求：

• kubernetes集群中已部署 tekton pipeline、tekton triggers以及tekton dashboard 三个组件；
• 本示例使用LoadBalancer 暴露 EventListener service，集群中有可用负载均衡器分配IP地址。

创建serviceaccount

官方示例：https://github.com/tektoncd/triggers/blob/main/examples/rbac.yaml

因为 EventListener 最终需要创建 taskrun、pipelinerun 同时会查询一些其他信息，因此需要为其配置一个 serviceAccount，同时还需要为这个 serviceAccount 赋予相应的权限。

$ cat serviceAccount.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
  name: tekton-triggers-example-sa
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: triggers-example-eventlistener-binding
subjects:
- kind: ServiceAccount
  name: tekton-triggers-example-sa
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: tekton-triggers-eventlistener-roles
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: triggers-example-eventlistener-clusterbinding
subjects:
- kind: ServiceAccount
  name: tekton-triggers-example-sa
  namespace: default
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: tekton-triggers-eventlistener-clusterroles

应用yaml

kubectl apply -f serviceAccount.yaml

创建EventListener

EventListener 是一个 Kubernetes 对象，用于侦听 Kubernetes 集群上指定端口上的事件。它公开了一个可寻址接收器，用于接收传入事件并指定一个或多个 Triggers 。

$ cat eventListener.yaml
apiVersion: triggers.tekton.dev/v1beta1
kind: EventListener
metadata:
  name: gitlab-pr
spec:
  serviceAccountName: tekton-triggers-example-sa
  resources:
    kubernetesResource:
      serviceType: LoadBalancer
  triggers:
    - name: pr-trigger
      bindings:
        - ref: gitlab-pr-trigger-binding
      template:
        ref: gitlab-pr-trigger-template

应用yaml

kubectl apply -f eventListener.yaml

创建TriggerBinding

TriggerBinding 允许您从事件负载中提取字段并将它们绑定到命名参数，然后可以在 TriggerTemplate 中使用这些命名参数。

$ cat triggerBinding.yaml
apiVersion: triggers.tekton.dev/v1beta1
kind: TriggerBinding
metadata:
  name: gitlab-pr-trigger-binding
spec:
  params:
    - name: message
      value: hello

应用yaml

kubectl apply -f triggerBinding.yaml

创建TriggerTemplate

TriggerTemplate 是指定资源蓝图的资源，例如 TaskRun 或 PipelineRun ，当您的EventListener 检测到事件。它公开了您可以在资源模板中的任何位置使用的参数。

以下示例通过pipelineSpec和taskSpec直接引入task并运行：

$ cat triggerTemplate.yaml
apiVersion: triggers.tekton.dev/v1beta1
kind: TriggerTemplate
metadata:
  name: gitlab-pr-trigger-template
spec:
  params:
    - name: message
      default: hello
  resourcetemplates:
    - apiVersion: tekton.dev/v1beta1
      kind: PipelineRun
      metadata:
        generateName: hello-
      spec:
        params:
          - name: message
            value: $(tt.params.message)
        pipelineSpec:
          tasks:
            - name: hello-message
              taskSpec:
                steps:
                  - name: run-hello
                    image: alpine
                    script: |
                      echo $(params.message)

应用yaml

kubectl apply -f triggerTemplate.yaml

完整示例

$ cat githlab_trigger.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
  name: tekton-triggers-example-sa
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: triggers-example-eventlistener-binding
subjects:
- kind: ServiceAccount
  name: tekton-triggers-example-sa
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: tekton-triggers-eventlistener-roles
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: triggers-example-eventlistener-clusterbinding
subjects:
- kind: ServiceAccount
  name: tekton-triggers-example-sa
  namespace: default
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: tekton-triggers-eventlistener-clusterroles

---
apiVersion: triggers.tekton.dev/v1beta1
kind: EventListener
metadata:
  name: gitlab-pr
spec:
  serviceAccountName: tekton-triggers-example-sa
  resources:
    kubernetesResource:
      serviceType: LoadBalancer
  triggers:
    - name: pr-trigger
      bindings:
        - ref: gitlab-pr-trigger-binding
      template:
        ref: gitlab-pr-trigger-template
---
apiVersion: triggers.tekton.dev/v1beta1
kind: TriggerBinding
metadata:
  name: gitlab-pr-trigger-binding
spec:
  params:
    - name: message
      value: hello
---
apiVersion: triggers.tekton.dev/v1beta1
kind: TriggerTemplate
metadata:
  name: gitlab-pr-trigger-template
spec:
  params:
    - name: message
      default: hello
  resourcetemplates:
    - apiVersion: tekton.dev/v1beta1
      kind: PipelineRun
      metadata:
        generateName: hello-
      spec:
        params:
          - name: message
            value: $(tt.params.message)
        pipelineSpec:
          tasks:
            - name: hello-message
              taskSpec:
                steps:
                  - name: run-hello
                    image: alpine
                    script: |
                      echo $(params.message)

应用以上配置

kubectl apply -f githlab_trigger.yaml

配置gitlab webhook

查看EventListener service 监听地址和端口

root@kube001:~# kubectl get svc
NAME           TYPE           CLUSTER-IP    EXTERNAL-IP      PORT(S)                         AGE
el-gitlab-pr   LoadBalancer   10.96.0.235   192.168.72.224   8080:31293/TCP,9000:30628/TCP   8m7s

EventListener service 使用LoadBalancer 方式暴露到集群外，访问地址为：

http://192.168.72.224:8080

访问自建 gitlab 管理界面，新建demo项目，在项目Settings---> Webhooks中配置 EventListener 监听地址：

点击Push events进行测试，或者推送代码到gitlab项目仓库

点击Edit查看测试结果

查看触发的pipeline任务

root@kube001:~# kubectl get pipelineruns | grep hello
hello-vrrs2                      True        Succeeded                  4m42s       4m34s

查看运行完成的pods

root@kube001:~# kubectl get pods
NAME                                                    READY   STATUS       RESTARTS   AGE
el-gitlab-pr-5f5749d48f-rqmlb                           1/1     Running      0          12m
hello-vrrs2-hello-message-pod                           0/1     Completed    0          5m49s

访问dashboard查看自动执行的pipelinerun

任务详情