Automating Tekton Image Synchronization and Deployment to Tencent Cloud Registry with GitHub Actions

Tekton is a powerful, flexible open‑source cloud‑native CI/CD framework that provides a full‑featured, standardized solution for building pipelines. The article walks through automating the synchronization of Tekton images to the Tencent Cloud container registry and deploying Tekton on a Kubernetes cluster.

Application Images

The original images are hosted in the Alibaba Cloud registry, but the workflow moves them to ccr.ccs.tencentyun.com/tektons using a custom mapping.

GitHub Actions Pipeline

name: Get Tekton Images
env:
  VERSION: v0.29.0
on:
  push:
    paths:
      - '.github/workflows/tekton.yaml'
      - 'tekton/**'
jobs:
  build:
    runs-on: ubuntu-18.04
    steps:
      - uses: actions/checkout@v2
      - name: build
        run: |
          curl https://storage.googleapis.com/tekton-releases/pipeline/previous/${{ env.VERSION }}/release.yaml -o release.yaml
          grep -v "#" release.yaml | grep -v "^$" > release1.yaml ; sed -i 's/---/###/g' release1.yaml
          python3 tekton/get_tekton_images.py ${{ secrets.DOCKER_USER }} ${{ secrets.DOCKER_PASSWD }}
      - uses: actions/upload-artifact@v2
        with:
          name: ${{ env.VERSION }}-tekton-images
          path: tekton_images.json

Deployment File Parsing

The workflow downloads the Tekton release YAML, extracts the Deployment objects for components such as tekton-pipelines-controller, tekton-pipelines-webhook, and tekton-dashboard, and collects their image references.

Python Image‑Parsing Script

import yaml
import json
import sys
import os

class Tekton:
    def __init__(self, file_name, registry_user, registry_passwd):
        self.yaml_file = file_name
        self.arg_imgs = ["gcr.io/tekton-releases/github.com/tektoncd/dashboard/cmd/dashboard@sha256:95f71a2568ced67ec370b5360f88bec3280601908cac9e62dfbb801114480437"]
        self.split_str = "###"
        self.deployments = ["tekton-pipelines-controller", "tekton-pipelines-webhook"]
        self.kind_type = "Deployment"
        self.target_registry = "ccr.ccs.tencentyun.com/tektons/"
        self.repos = ["controller", "kubeconfigwriter", "git-init", "entrypoint", "nop", "imagedigestexporter", "pullrequest-init", "cloud-sdk", "base", "powershell", "webhook"]
        self.result = []
        self.registry_user = registry_user
        self.registry_passwd = registry_passwd
    # ... (methods load_yaml, load_json, get_images, save_json_file, sync_images) ...

if __name__ == '__main__':
    tekton = Tekton("release1.yaml", sys.argv[1], sys.argv[2])
    images = tekton.get_images()
    tekton.save_json_file(images, "tekton_images.json")
    tekton.sync_images()

Image Mapping File

The generated JSON maps each source image ( s_image) to its target in the Tencent registry ( t_image), for example:

[
    {
        "s_image": "gcr.io/tekton-releases/github.com/tektoncd/pipeline/cmd/controller:v0.29.0@sha256:72f79471f06d096cc53e51385017c9f0f7edbc87379bf415f99d4bd11cf7bc2b",
        "t_image": "ccr.ccs.tencentyun.com/tektons/controller:v0.29.0"
    },
    ...
]

The mapping file can be downloaded from the GitHub Actions run page.

Downloading Images Script

import json 
import os 

class Tekton:
    def __init__(self):
        self.json_file = "tekton_images.json"
        self.target_registry = "ccr.ccs.tencentyun.com/tektons/"
    def load_json(self, data):
        return json.loads(data)
    def down_images(self):
        f = open(self.json_file, 'r').read()
        content = self.load_json(f)
        for item in content:
            print("[GetImages] {}".format(item["t_image"]))
            docker_pull_cmd = "docker pull {0}".format(item["t_image"])
            os.system(docker_pull_cmd + "&&" + docker_tag_cmd)
            print("[GetImagesDone] {}".format(item))

if __name__ == '__main__':
    Tekton().down_images()

Deploying Tekton

After updating the image references in release.yaml (or tekton-dashboard-release.yaml), apply the manifests with kubectl apply -f release.yaml. Verify the pods are running:

# kubectl -n tekton-pipelines get pod
NAME                                 READY   STATUS    RESTARTS   AGE
tekton-dashboard-5c4b89d9-2z8g7    1/1     Running   0          21m
tekton-pipelines-controller-...    1/1     Running   0          13h
tekton-pipelines-webhook-...        1/1     Running   0          13h

An Ingress can expose the Tekton dashboard:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: tekton-service
  namespace: tekton-pipelines
  annotations:
    kubernetes.io/ingress.class: nginx
    nginx.ingress.kubernetes.io/proxy-body-size: 256m
spec:
  rules:
  - host: tekton.idevops.site
    http:
      paths:
      - path: /
        backend:
          serviceName: tekton-dashboard
          servicePort: 9097

Finally, a sample Tekton pipeline task is provided to run Maven builds on a Git repository:

apiVersion: tekton.dev/v1beta1
kind: Task
metadata:
  name: tektoncd-task
spec:
  resources:
    inputs:
    - name: repo
      type: git
  steps:
  - name: run-test
    image: maven:3-jdk-8
    workingDir: /workspace/repo
    command: ["mvn"]
    args: ["clean", "package"]
---
apiVersion: tekton.dev/v1alpha1
kind: PipelineResource
metadata:
  name: tektoncd-resource
spec:
  type: git
  params:
  - name: url
    value: http://192.168.1.200/devops/devops-maven-service.git
  - name: revision
    value: master
---
apiVersion: tekton.dev/v1beta1
kind: TaskRun
metadata:
  name: cdpipeline
spec:
  taskRef:
    name: tektoncd-task
  resources:
    inputs:
    - name: repo
      resourceRef:
        name: tektoncd-resource

By following these steps, users can fully automate the acquisition, retagging, and deployment of Tekton components to a private Tencent Cloud registry and run CI/CD pipelines on Kubernetes.