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    # Gitlab CI/CD pipeline Gitlab 提供 CI/CD pipeline 讓使用者實踐持續整合與持續部署 撰寫.gitlab-ci.yml做為CI/CD pipeline自動執行各階段指令的腳本 pipeline可自行定義stages 常見如: * test * build * deploy stage中又定義了幾個jobs 例如: * test stage的test_job1、test_job2 * build stage的build_api、build_ui * deploy stage的deploy_prod stage與job在Gitlab中的圖像呈現: ![](https://hackmd.io/_uploads/SkBQ2Xk-T.png) 圖片來源:Gitlab documentation stage可以定義順序並按照順序執行 若前面的stage中有一job執行失敗 則後面的stage都不會執行 而每個job都由不同的Gitlab runner獨立執行job 各runner環境獨立不互相影響 所以每個job可以同時進行 **Gitlab CI/CD pipeline 的結構與流程:** ![](https://hackmd.io/_uploads/H1v1sXJZa.png) 圖片來源:gitlab.com # 實作 ### 簡介 用Gitlab CI/CD pipeline自動化完成 Build docker image跟上傳至docker hub的動作 此例使用一簡單Flask App實作 ### Push to Gitlab 將程式碼與Dockerfile一同上傳至Gitlab專案中 ![](https://hackmd.io/_uploads/BJGXzXk-6.png) 此例Flask App內容: ```python= from flask import Flask app = Flask(__name__) @app.route("/") def hello(): return "Hello World from Flask" if __name__ == "__main__": # Only for debugging while developing app.run(host='0.0.0.0', debug=True, port=80) ``` Dockerfile內容: ```dockerfile! FROM tiangolo/uwsgi-nginx-flask:python3.11 COPY ./app /app ``` ### 變數設置 登入docker hub時需要使用到的User Id跟密碼 可以透過設置變數的方式帶入Script 設置位置: project settings > CI/CD > Variables ![](https://hackmd.io/_uploads/rkaDDm1Zp.png) 已新增的變數: ![](https://hackmd.io/_uploads/Hya3DQ1Z6.png) ### Add .gitlab-ci.yml 新增並撰寫.gitlab-ci.yml 來自動執行pipeline裡各stage中job的script .gitlab-ci.yml內容: ```yml #定義有哪些stage stages: - build #要使用的image image: docker:latest #定義job push_docker_image: services: - docker:dind #此job屬於哪一stage stage: build #執行script前的script before_script: # 登入docker hub - docker login -u $dockerhub_userID -p $dockerhub_password #主要script script: # build docker image - docker build -t flask_image . # add tag to image - docker tag flask_image $dockerhub_userID/flask_image # push to docker hub - docker push $dockerhub_userID/flask_image ``` Commit changes之後就會開始自動執行pipeline 每個stage會依順序執行 若stage中有一job執行fail 後面的stage就不會執行 pipeline開始執行後可到job裡查看script執行過程 ![](https://hackmd.io/_uploads/Hk91r7kW6.png) ![](https://hackmd.io/_uploads/S1R6VXkZ6.png) 執行成功 可見Build完成的docker image已經上傳至docker hub ![](https://hackmd.io/_uploads/ByG7L7yZ6.png) project repository: https://gitlab.com/leefangyu/flaskapp # Reference https://hub.docker.com/r/tiangolo/uwsgi-nginx-flask/?source=post_page-----b8bdc60d1dc7-------------------------------- https://docs.gitlab.com/ee/ci/variables/

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