Jenkins & Docker Integration.

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JENKINS & DOCKER INTEGRATION ASH WU @ AGILE MEETUP DEC 2014

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KKTIX 導入 Docker 的故事…

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Continuous Integration

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CONTINUOUS INTEGRATION Continuous integration (CI) is the practice, in software engineering, of merging all developer working copies with a shared mainline several times a day. It was first named and proposed by Grady Booch in his method,[1] who did not advocate integrating several times a day. It was adopted as part of extreme programming (XP), which did advocate multiple integrations a day, perhaps as many as tens a day. The main aim of CI is to prevent integration problems, referred to as "integration hell" in early descriptions of XP. CI isn't universally accepted as an improvement over frequent integration, so it is important to distinguish between the two as there is disagreement about the virtues of each…… http://en.wikipedia.org/wiki/Continuous_integration

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測試

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自動化測試

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QA 的測試，代表的是 QA 對這個產品負責自動化測試，代表的是你對你自己寫的程式負責。

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為什麼要寫測試？

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•  有了測試，就不會修 A 壞 B •  出現過的 bug 不會再出現 •  重構、加新功能、修 bug 的時候更有信心 •  QA 時間縮短，deploy 頻率增加

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第一、男子漢在緊要關頭，要當仁不讓！第二、現在就是緊要關頭！第三、我們就是男子漢！ - 功夫棒球

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第一、工程師在重要專案，要寫測試！第二、現在就是重要專案！第三、我們就是工程師！

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爛測試比沒測試好

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Continuous Integration

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http://xkcd.com/303/

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CI SERVICES

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SELF-HOSTED CI http://en.wikipedia.org/wiki/Comparison_of_continuous_integration_software

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JENKINS •  Since 2004 •  Open source •  Java •  Support CVS, SVN, Git, HG… •  LOTS of plugins.

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JENKINS BUILD TRIGGER 1. 手動 2. 有人 push master branch 3. 有人發 github pull request https://wiki.jenkins-ci.org/display/JENKINS/GitHub+pull+request+builder+plugin

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CI OF KKTIX •  KKTIX 是用 Rails & Go 搭建 •  有單元測試，也有整合測試 •  測試時會用到許多資源與服務

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Disk

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Port

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Postgres

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Redis

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Elasticsearch

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Selenium

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靈異現象

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不利平行化測試

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你以為我要開始講 Docker 了對不對？

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新需求 QA 環境

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GITHUB-FLOW

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Disk

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Port

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Postgres

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Redis

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Elasticsearch

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為什麼不改程式來解決？

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很麻煩

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程式碼越多，執行效能越差

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程式碼越多，bug 數量越多

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你以為我終於要開始講 Docker 了對不對？

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http://blog.docker.com

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Develop, Ship and Run Any Application, Anywhere

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DOCKER USE CASE 1.  開發環境 (http://www.fig.sh/) 2.  Open source project •  https://github.com/stucki/docker-cyanogenmod •  https://github.com/discourse/discourse_docker 3.  伺服器部署 •  https://coreos.com/ •  http://aws.amazon.com/ecs/ •  https://cloud.google.com/container-engine/

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DOCKER BASICS •  Image (frozen app) •  Container •  1 image > multiple running container •  No init •  Process finished, container stopped.

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HOW TO CREATE DOCKER IMAGE •  docker pull 取得 image > docker run 某個 image 做修改 > docker commit 成新的 image (https://registry.hub.docker.com) •  寫 Dockerfile 執行 docker build (FROM ubuntu/12:04)

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DOCKER CONTAINER •  expose •  add / copy •  volume •  attach / detach •  pause / unpause •  link between containers

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MY PLAN

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JENKINS MASTER-SLAVES

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JENKINS DOCKER PLUGIN https://wiki.jenkins-ci.org/display/JENKINS/Docker+Plugin

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ACTUALLY YOU CAN RUNNING…

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ACTUALLY YOU CAN RUNNING…

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ACTUALLY YOU CAN RUNNING…

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ACTUALLY YOU CAN RUNNING…

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KKTIX/TEST

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KKTIX/1337

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KKTIX/QA

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QA ENVIRONMENT •  使用 volume 讓 container 和 host 共享目錄 •  Nginx 透過 subdomain 判斷連到哪一個 container 的 document root •  聽 port 的都改成聽 unix domain socket 免除處理 port 的困擾 •  Port 轉 socket 可用 socat ( http://www.dest-unreach.org/socat/ )

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HIPCHAT BOT INTEGRATION

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CONCLUSION •  如果還沒開始寫測試，趕快寫。現在，馬上。 •  有寫測試還沒有 CI, 可以試著用用看 CI •  已經有 run CI 的可以導入 Docker 讓測試環境單純化，做平行化測試

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